US20130015404A1 - Fullerene/titanium hydride gas source - Google Patents
Fullerene/titanium hydride gas source Download PDFInfo
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- US20130015404A1 US20130015404A1 US12/002,420 US242007A US2013015404A1 US 20130015404 A1 US20130015404 A1 US 20130015404A1 US 242007 A US242007 A US 242007A US 2013015404 A1 US2013015404 A1 US 2013015404A1
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- Prior art keywords
- fullerene
- mixture
- titanium hydride
- plasma
- solid
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- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910003472 fullerene Inorganic materials 0.000 title claims abstract description 42
- 229910000048 titanium hydride Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 28
- -1 titanium hydride Chemical compound 0.000 claims abstract description 26
- 239000008247 solid mixture Substances 0.000 claims abstract description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000008246 gaseous mixture Substances 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 7
- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical group ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 3
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 claims description 2
- 239000012047 saturated solution Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 16
- 239000001257 hydrogen Substances 0.000 abstract description 16
- 230000000116 mitigating effect Effects 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 210000002381 plasma Anatomy 0.000 description 46
- 239000007789 gas Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 10
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010494 dissociation reaction Methods 0.000 description 3
- 230000005593 dissociations Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052805 deuterium Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052722 tritium Inorganic materials 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 101710158075 Bucky ball Proteins 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
- C01B3/065—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents from a hydride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/152—Fullerenes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/152—Fullerenes
- C01B32/156—After-treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Definitions
- the present invention is generally related to compositions, methods and apparatus for producing gaseous mixtures.
- the present invention is related to methods for rapidly producing gaseous mixtures that are particularly useful for mitigating major disruption events in plasmas such as those created in magnetically confined fusion plasma devices.
- Gaseous plasmas generally consist of mixtures of electrons, positively charged ionic species, and neutral gaseous atoms and/or molecules.
- magnetic fields are used to confine the hot plasma within a containment vessel so that the plasma does not touch the vessel wall.
- the phenomenon known as major disruption of a magnetically confined plasma is a fast and detrimental process by which the large amount of thermal and magnetic energy, that normally exists in a magnetically confined plasma is transferred to the wall of the plasma containment vessel, leading to its damage, up to and including melting and vaporization of the wall material.
- Such disruptions are created by macroscopic instabilities in the plasma that cause a rapid thermal quench of the plasma column.
- the disruption phenomenon also produces large forces acting on the mechanical structure of the containment vessel.
- Magnetically confined plasma devices such as the International Thermonuclear Experimental Reactor (ITER) now under construction would benefit from a reliable and real-time process for preventing or mitigating this phenomenon.
- ITER International Thermonuclear Experimental Reactor
- the basic approach to plasma disruption mitigation involves quickly converting the thermal and magnetic energy of the plasma, which is typically characterized by a plasma energy density of approximately 1 gigajoule (GJ) in a volume of approximately 1,000 cubic meters in a device such as the ITER, into radiation within a time period of approximately 1 millisecond, while simultaneously increasing the density of free and bound electrons in the plasma by a factor of approximately 100 over the entire plasma cross section.
- GJ gigajoule
- This process suppresses the conversion of the plasma and magnetic field energy into an avalanche of high energy runaway electrons, which would otherwise reach the wall of the plasma containment vessel and cause its melting and vaporization.
- One specific version of this approach is known as the impurity injection method.
- One impurity injection method involves ionizing an impurity gas to form an impurity plasma, followed by electro-dynamic acceleration of the impurity plasma and its injection into the target plasma, which converts the target plasma energy into radiation and provides a harmless and rapid quench of the plasma thermal energy and current.
- This method must utilize enough mass of an impurity gas of sufficiently high atomic number, which must be injected with a density and velocity that are sufficiently high that the impurity ions penetrate to the core of the hot plasma and strongly radiate the energy on the fast disruption time scale in order to achieve real-time mitigation.
- High pressure jets of neutral gaseous species such as the inert gases neon or argon, have been considered for this purpose in the technique known as massive injection.
- one well recognized problem is that once the impurity gas atoms are ionized in a thin outer layer of the hot plasma, they can no longer penetrate the confining magnetic field unless they possess a sufficiently high velocity to overcome the magnetic pressure of the magnetic field confining the plasma.
- the injection velocity of a neutral gas is limited to a relatively low value and thus the mitigation process must rely on the inward propagation of a cooling front wave, enhancement of magneto-hydrodynamic (MHD) activity, and mixing of impurity gas into the core plasma.
- MHD magneto-hydrodynamic
- These processes take a relatively long time time, estimated to be at least 40 milliseconds for the ITER device. Moreover, controlling the sequence and timing of these processes is difficult, yet they are necessary to obtain reliable and prompt disruption mitigation.
- the object and purpose of the present invention to provide a composition that is capable of rapidly producing on demand a gas that is suitable for mitigating disruptions in plasmas, as well as methods for making such a composition and producing the gas from such composition on demand.
- composition of matter of the present invention consists essentially of a solid mixture of titanium hydride (TiH 2 ) and fullerene (C 60 ). Such a mixture is capable of being heated to produce a gaseous mixture of molecular hydrogen (H 2 ) and fullerene on demand.
- the solid mixture may be used, in accordance with the method of the present invention, to produce a gaseous mixture of molecular hydrogen and fullerene on demand, by heating the mixture to a temperature of between approximately 300° C. and 600° C.
- the mixture is preferably heated by passing a high power electrical current through the mixture, resulting in rapid resistive heating of the mixture and emission of the gaseous mixture by dissociation of the titanium hydride and sublimation of the fullerene. Rapid resistive heating is preferably accomplished by applying a high power electrical current to the mixture from a bank of charged electrical capacitors.
- the solid mixture of the present invention preferably consists essentially of solid granular titanium hydride infused with fullerene, which is preferably in the form of a fine-grained fullerene powder interspersed in the interstitial spaces between grains of titanium hydride.
- fullerene which is preferably in the form of a fine-grained fullerene powder interspersed in the interstitial spaces between grains of titanium hydride.
- Such a mixture is sufficiently electrically conductive to permit rapid resistive heating by passage of a high power electrical current through it.
- Such a mixture may be formed by the method of the present invention, which includes the steps of infusing solid granular titanium hydride with a solution of fullerene dissolved in an organic solvent, followed by evaporation of the solvent to leave the fullerene in the form of a fine-grained powder.
- the gaseous mixture of hydrogen and fullerene produced by the method and composition of the present invention may be subsequently ionized and accelerated as a plasma slug in a coaxial plasma gun, and thereby injected into a hot target plasma for the purpose of mitigating a disruption before it results in damage to the surrounding containment vessel.
- a composition of matter suitable for producing on demand a gaseous mixture of molecular hydrogen (H 2 ) and fullerene (C 60 ) consists essentially of a solid mixture of fullerene and titanium hydride (TiH 2 ).
- Fullerene is a carbon molecule consisting of 60 carbon atoms connected in an approximately spherical geometric array. It is also casually referred to as buckyball or buckminsterfullerene. Fullerene is commercially available in the form of a black granular powder that is stable at room temperature. Fullerene sublimates at a nominal temperature of approximately 527° C.
- Titanium hydride is also a solid at room temperature. Upon being heated to a temperature range of approximately 300° C. to 600° C., titanium hydride releases molecular hydrogen gas (H 2 ), leaving behind solid metallic titanium. Such heating produces approximately 448 cm 3 of hydrogen per gram of titanium hydride.
- the solid mixture of the present invention preferably consists of titanium hydride and fullerene in the ratio of approximately 2.5 to 1.0 by weight.
- the solid mixture of fullerene and titanium hydride is formed by infusing a quantity of solid, granular titanium hydride with a saturated solution of fullerene dissolved in a suitable volatile solvent, for example 1,2,4 trichlorobenzene, carbon disulfide, or toluene.
- a suitable volatile solvent for example 1,2,4 trichlorobenzene, carbon disulfide, or toluene.
- the infused mixture is then heated to a temperature of less than 300° C. to evaporate and remove the solvent without dissociating the titanium hydride or sublimating the fullerene, thus leaving behind a solid mixture made up of solid, fine-grained fullerene deposited in the interstitial spaces within the granular titanium hydride.
- the resulting solid mixture can be stored indefinitely until needed.
- the mixture is heated to a temperature of between approximately 300° C. and 600° C., which results in dissociation of the TiH 2 to produce gaseous hydrogen (H 2 ) and sublimation of the fullerene to produce gaseous fullerene, leaving behind solid titanium that is essentially depleted of hydrogen.
- the solid mixture is preferably heated as rapidly as possible in order to release the hydrogen and fullerene essentially simultaneously; that is, without differential release of hydrogen and fullerene at different rates or at different times and temperatures.
- Rapid heating is preferably accomplished by electro-thermal resistance heating, which is attained by passing a high power electrical current through the solid mixture.
- An example of a suitable source for such a high power electrical current is a bank of charged electrical capacitors, which is preferably capable of providing a current of approximately 14 kiloamperes through a volume of approximately 3 cm 3 of the solid mixture of titanium hydride and fullerene.
- Electro-thermal heating of the mixture is desirable because it produces a discrete parcel of gaseous hydrogen and fullerene within a period of a few microseconds.
- the resulting gaseous mixture consists of hydrogen, which has a very low molecular weight of 2 grams/mole, and fullerene, which has a molecular weight of 720 grams/mole, which is very high for a stable gaseous species.
- This combination of high- and low-molecular weight gaseous species can then be partially ionized to create what is sometimes referred to as a plasma slug. Ionization may be accomplished with an electron beam or other known processes for creating a plasma. The resulting plasma slug may be accelerated and injected into a second plasma, to quench the second plasma and mitigate electromagnetic disruptions in the second plasma.
- the advantage of the combination of ionized hydrogen and fullerene is that it can be used to produce a heavy plasma slug, with mass distributed uniformly over the slug volume, which upon acceleration is suitable for penetrating the hot second plasma and its confining magnetic field. Further, the mixture of hydrogen and fullerene is entirely gaseous, unlike dusty plasmas previously proposed for disruption mitigation, thus resulting in a more homogenous and predictably controllable plasma for use in disruption mitigation.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
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Abstract
Description
- The present invention is generally related to compositions, methods and apparatus for producing gaseous mixtures. In particular, the present invention is related to methods for rapidly producing gaseous mixtures that are particularly useful for mitigating major disruption events in plasmas such as those created in magnetically confined fusion plasma devices.
- Gaseous plasmas generally consist of mixtures of electrons, positively charged ionic species, and neutral gaseous atoms and/or molecules. In various devices, magnetic fields are used to confine the hot plasma within a containment vessel so that the plasma does not touch the vessel wall.
- The phenomenon known as major disruption of a magnetically confined plasma is a fast and detrimental process by which the large amount of thermal and magnetic energy, that normally exists in a magnetically confined plasma is transferred to the wall of the plasma containment vessel, leading to its damage, up to and including melting and vaporization of the wall material. Such disruptions are created by macroscopic instabilities in the plasma that cause a rapid thermal quench of the plasma column. The disruption phenomenon also produces large forces acting on the mechanical structure of the containment vessel. Magnetically confined plasma devices such as the International Thermonuclear Experimental Reactor (ITER) now under construction would benefit from a reliable and real-time process for preventing or mitigating this phenomenon.
- The basic approach to plasma disruption mitigation involves quickly converting the thermal and magnetic energy of the plasma, which is typically characterized by a plasma energy density of approximately 1 gigajoule (GJ) in a volume of approximately 1,000 cubic meters in a device such as the ITER, into radiation within a time period of approximately 1 millisecond, while simultaneously increasing the density of free and bound electrons in the plasma by a factor of approximately 100 over the entire plasma cross section. This process suppresses the conversion of the plasma and magnetic field energy into an avalanche of high energy runaway electrons, which would otherwise reach the wall of the plasma containment vessel and cause its melting and vaporization.
- One specific version of this approach is known as the impurity injection method. One impurity injection method involves ionizing an impurity gas to form an impurity plasma, followed by electro-dynamic acceleration of the impurity plasma and its injection into the target plasma, which converts the target plasma energy into radiation and provides a harmless and rapid quench of the plasma thermal energy and current.
- This method must utilize enough mass of an impurity gas of sufficiently high atomic number, which must be injected with a density and velocity that are sufficiently high that the impurity ions penetrate to the core of the hot plasma and strongly radiate the energy on the fast disruption time scale in order to achieve real-time mitigation. High pressure jets of neutral gaseous species, such as the inert gases neon or argon, have been considered for this purpose in the technique known as massive injection. However, one well recognized problem is that once the impurity gas atoms are ionized in a thin outer layer of the hot plasma, they can no longer penetrate the confining magnetic field unless they possess a sufficiently high velocity to overcome the magnetic pressure of the magnetic field confining the plasma. The injection velocity of a neutral gas is limited to a relatively low value and thus the mitigation process must rely on the inward propagation of a cooling front wave, enhancement of magneto-hydrodynamic (MHD) activity, and mixing of impurity gas into the core plasma. These processes take a relatively long time time, estimated to be at least 40 milliseconds for the ITER device. Moreover, controlling the sequence and timing of these processes is difficult, yet they are necessary to obtain reliable and prompt disruption mitigation.
- One approach to the problem of delivering an impurity gas having sufficient mass to penetrate a plasma has been the proposed use of “dusty” plasma, which is an ionized gas containing particles of carbon, or other particulate material, having a size on the order of 10 microns in diameter. One problem with such an approach, however, is that the injection plasma must be accelerated, and the particulate matter in such a plasma is very heavy, such that it must be dragged b the ambient accelerated plasma, a process that limits the velocities that can be obtained with the particulate material.
- Accordingly, it is the object and purpose of the present invention to provide a composition that is capable of rapidly producing on demand a gas that is suitable for mitigating disruptions in plasmas, as well as methods for making such a composition and producing the gas from such composition on demand.
- In accordance with the present invention there is provided a novel composition of matter, a method for its use, and a method for its formation.
- The composition of matter of the present invention consists essentially of a solid mixture of titanium hydride (TiH2) and fullerene (C60). Such a mixture is capable of being heated to produce a gaseous mixture of molecular hydrogen (H2) and fullerene on demand.
- The solid mixture may be used, in accordance with the method of the present invention, to produce a gaseous mixture of molecular hydrogen and fullerene on demand, by heating the mixture to a temperature of between approximately 300° C. and 600° C. The mixture is preferably heated by passing a high power electrical current through the mixture, resulting in rapid resistive heating of the mixture and emission of the gaseous mixture by dissociation of the titanium hydride and sublimation of the fullerene. Rapid resistive heating is preferably accomplished by applying a high power electrical current to the mixture from a bank of charged electrical capacitors.
- The solid mixture of the present invention preferably consists essentially of solid granular titanium hydride infused with fullerene, which is preferably in the form of a fine-grained fullerene powder interspersed in the interstitial spaces between grains of titanium hydride. Such a mixture is sufficiently electrically conductive to permit rapid resistive heating by passage of a high power electrical current through it. Such a mixture may be formed by the method of the present invention, which includes the steps of infusing solid granular titanium hydride with a solution of fullerene dissolved in an organic solvent, followed by evaporation of the solvent to leave the fullerene in the form of a fine-grained powder.
- The gaseous mixture of hydrogen and fullerene produced by the method and composition of the present invention may be subsequently ionized and accelerated as a plasma slug in a coaxial plasma gun, and thereby injected into a hot target plasma for the purpose of mitigating a disruption before it results in damage to the surrounding containment vessel.
- These and other aspects of the present invention are further described in the following detailed description of the preferred embodiment.
- In accordance with the preferred embodiment of the present invention, a composition of matter suitable for producing on demand a gaseous mixture of molecular hydrogen (H2) and fullerene (C60) consists essentially of a solid mixture of fullerene and titanium hydride (TiH2).
- Fullerene is a carbon molecule consisting of 60 carbon atoms connected in an approximately spherical geometric array. It is also casually referred to as buckyball or buckminsterfullerene. Fullerene is commercially available in the form of a black granular powder that is stable at room temperature. Fullerene sublimates at a nominal temperature of approximately 527° C.
- Titanium hydride is also a solid at room temperature. Upon being heated to a temperature range of approximately 300° C. to 600° C., titanium hydride releases molecular hydrogen gas (H2), leaving behind solid metallic titanium. Such heating produces approximately 448 cm3 of hydrogen per gram of titanium hydride.
- While the present invention is described here in part by references to the use of titanium hydride and its dissociation to produce hydrogen, it should be understood that the isotopes of hydrogen, namely deuterium and tritium, are equally suitable for use in the present invention, and may in fact offer certain advantages in the practice of the invention. Thus the term “hydrogen” herein means deuterium and tritium, as well as the isotope common commonly known as hydrogen.
- The solid mixture of the present invention preferably consists of titanium hydride and fullerene in the ratio of approximately 2.5 to 1.0 by weight.
- In accordance with the preferred embodiment of the method present invention, the solid mixture of fullerene and titanium hydride is formed by infusing a quantity of solid, granular titanium hydride with a saturated solution of fullerene dissolved in a suitable volatile solvent, for example 1,2,4 trichlorobenzene, carbon disulfide, or toluene. The infused mixture is then heated to a temperature of less than 300° C. to evaporate and remove the solvent without dissociating the titanium hydride or sublimating the fullerene, thus leaving behind a solid mixture made up of solid, fine-grained fullerene deposited in the interstitial spaces within the granular titanium hydride. The resulting solid mixture can be stored indefinitely until needed.
- In accordance with the method of the present invention for using the solid mixture of titanium hydride and fullerene, the mixture is heated to a temperature of between approximately 300° C. and 600° C., which results in dissociation of the TiH2 to produce gaseous hydrogen (H2) and sublimation of the fullerene to produce gaseous fullerene, leaving behind solid titanium that is essentially depleted of hydrogen. The solid mixture is preferably heated as rapidly as possible in order to release the hydrogen and fullerene essentially simultaneously; that is, without differential release of hydrogen and fullerene at different rates or at different times and temperatures.
- Rapid heating is preferably accomplished by electro-thermal resistance heating, which is attained by passing a high power electrical current through the solid mixture. An example of a suitable source for such a high power electrical current is a bank of charged electrical capacitors, which is preferably capable of providing a current of approximately 14 kiloamperes through a volume of approximately 3 cm3 of the solid mixture of titanium hydride and fullerene. Electro-thermal heating of the mixture is desirable because it produces a discrete parcel of gaseous hydrogen and fullerene within a period of a few microseconds.
- The resulting gaseous mixture consists of hydrogen, which has a very low molecular weight of 2 grams/mole, and fullerene, which has a molecular weight of 720 grams/mole, which is very high for a stable gaseous species.
- This combination of high- and low-molecular weight gaseous species can then be partially ionized to create what is sometimes referred to as a plasma slug. Ionization may be accomplished with an electron beam or other known processes for creating a plasma. The resulting plasma slug may be accelerated and injected into a second plasma, to quench the second plasma and mitigate electromagnetic disruptions in the second plasma. The advantage of the combination of ionized hydrogen and fullerene is that it can be used to produce a heavy plasma slug, with mass distributed uniformly over the slug volume, which upon acceleration is suitable for penetrating the hot second plasma and its confining magnetic field. Further, the mixture of hydrogen and fullerene is entirely gaseous, unlike dusty plasmas previously proposed for disruption mitigation, thus resulting in a more homogenous and predictably controllable plasma for use in disruption mitigation.
- The present invention is described herein by reference to certain preferred embodiments. However it is understood that various modifications and variations may be made by one of ordinary skill in the art without departing from the present invention. Consequently the scope of the present invention is defined by the following claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/002,420 US8337807B1 (en) | 2007-12-17 | 2007-12-17 | Fullerene/titanium hydride gas source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/002,420 US8337807B1 (en) | 2007-12-17 | 2007-12-17 | Fullerene/titanium hydride gas source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US8337807B1 US8337807B1 (en) | 2012-12-25 |
| US20130015404A1 true US20130015404A1 (en) | 2013-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/002,420 Expired - Fee Related US8337807B1 (en) | 2007-12-17 | 2007-12-17 | Fullerene/titanium hydride gas source |
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| US (1) | US8337807B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120281798A1 (en) * | 2011-05-04 | 2012-11-08 | John Robert Thompson | Solid-state pulsed power plasma jet injector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122205A (en) * | 1989-10-05 | 1991-05-24 | Nippon Steel Corp | Manufacture of ti powder |
| US6399929B1 (en) * | 2000-05-12 | 2002-06-04 | Ajax Magnethermic Corporation | Induction heater comprising a coil/capacitor bank combination including a translatable coil assembly for movement on and off a continuous strip |
| US20050229489A1 (en) * | 2004-04-19 | 2005-10-20 | Texaco Inc. | Apparatus and method for hydrogen generation |
-
2007
- 2007-12-17 US US12/002,420 patent/US8337807B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122205A (en) * | 1989-10-05 | 1991-05-24 | Nippon Steel Corp | Manufacture of ti powder |
| US6399929B1 (en) * | 2000-05-12 | 2002-06-04 | Ajax Magnethermic Corporation | Induction heater comprising a coil/capacitor bank combination including a translatable coil assembly for movement on and off a continuous strip |
| US20050229489A1 (en) * | 2004-04-19 | 2005-10-20 | Texaco Inc. | Apparatus and method for hydrogen generation |
Non-Patent Citations (1)
| Title |
|---|
| Aso, JP 03122205 A, Published May 24, 1991, Derwent English Abstract * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120281798A1 (en) * | 2011-05-04 | 2012-11-08 | John Robert Thompson | Solid-state pulsed power plasma jet injector |
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| US8337807B1 (en) | 2012-12-25 |
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