DT ignition in a Z pinch compressed by an imploding liner
It has been shown that an m = 0 instability of a Z pinch carrying a current of the order of 10 MA with a rise time of less than 10 ns can generate a spark capable of igniting a fusion detonation in the adjacent DT plasma channel. A possible method for generating such currents, necessary for the impl...
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00295515_v41_n11_p1551_Bilbao |
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todo:paper_00295515_v41_n11_p1551_Bilbao2023-10-03T14:39:20Z DT ignition in a Z pinch compressed by an imploding liner Bilbao, L. Bernal, L. Linhart, J.G. Verri, G. Computer simulation Energy dissipation Ignition Inertial confinement fusion Nuclear energy Perturbation techniques Plasma confinement Joule heating Plasma energy Plasma theory It has been shown that an m = 0 instability of a Z pinch carrying a current of the order of 10 MA with a rise time of less than 10 ns can generate a spark capable of igniting a fusion detonation in the adjacent DT plasma channel. A possible method for generating such currents, necessary for the implosion of an initial large radius, low temperature Z pinch, can be a radial implosion of a cylindrical fast liner. The problem has been addressed in previous publications without considering the role played by an initially impressed m = 0 perturbation, a mechanism indispensable for the generation of a spark. The liner-Z pinch dynamics can be solved at several levels of physical model completeness. The first corresponds to a zero dimensional model in which the liner has a given mass per unit length and a zero thickness, the plasma is compressed adiabatically and is isotropic, and there are no energy losses or Joule heating. The second level is one dimensional. The Z pinch plasma is described by the full set of MHD, two-fluid equations. The liner is treated first as thin and incompressible, and subsequently it is assumed that it has a finite thickness and is composed of a heavy ion plasma, having an artificial but realistic equation of state. Both plasma and liner are considered uniform in the Z direction and only DT reactions are considered. It is shown that, given sufficient energy and speed of the liner, the Z pinch can reach a volume ignition. The third level is two dimensional. Plasma and liner are treated as in the second level but either the Z pinch or the liner is perturbed by an m = 0 non-uniformity. Provided the liner energy is high enough and the initial m = 0 perturbation is correctly chosen, the final neck plasma can act as a spark for DT ignition. It is also shown that the liner energy required for generating a spark and the subsequent detonation propagation are considerably less than in the case of volume ignition. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00295515_v41_n11_p1551_Bilbao |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Computer simulation Energy dissipation Ignition Inertial confinement fusion Nuclear energy Perturbation techniques Plasma confinement Joule heating Plasma energy Plasma theory |
| spellingShingle |
Computer simulation Energy dissipation Ignition Inertial confinement fusion Nuclear energy Perturbation techniques Plasma confinement Joule heating Plasma energy Plasma theory Bilbao, L. Bernal, L. Linhart, J.G. Verri, G. DT ignition in a Z pinch compressed by an imploding liner |
| topic_facet |
Computer simulation Energy dissipation Ignition Inertial confinement fusion Nuclear energy Perturbation techniques Plasma confinement Joule heating Plasma energy Plasma theory |
| description |
It has been shown that an m = 0 instability of a Z pinch carrying a current of the order of 10 MA with a rise time of less than 10 ns can generate a spark capable of igniting a fusion detonation in the adjacent DT plasma channel. A possible method for generating such currents, necessary for the implosion of an initial large radius, low temperature Z pinch, can be a radial implosion of a cylindrical fast liner. The problem has been addressed in previous publications without considering the role played by an initially impressed m = 0 perturbation, a mechanism indispensable for the generation of a spark. The liner-Z pinch dynamics can be solved at several levels of physical model completeness. The first corresponds to a zero dimensional model in which the liner has a given mass per unit length and a zero thickness, the plasma is compressed adiabatically and is isotropic, and there are no energy losses or Joule heating. The second level is one dimensional. The Z pinch plasma is described by the full set of MHD, two-fluid equations. The liner is treated first as thin and incompressible, and subsequently it is assumed that it has a finite thickness and is composed of a heavy ion plasma, having an artificial but realistic equation of state. Both plasma and liner are considered uniform in the Z direction and only DT reactions are considered. It is shown that, given sufficient energy and speed of the liner, the Z pinch can reach a volume ignition. The third level is two dimensional. Plasma and liner are treated as in the second level but either the Z pinch or the liner is perturbed by an m = 0 non-uniformity. Provided the liner energy is high enough and the initial m = 0 perturbation is correctly chosen, the final neck plasma can act as a spark for DT ignition. It is also shown that the liner energy required for generating a spark and the subsequent detonation propagation are considerably less than in the case of volume ignition. |
| format |
JOUR |
| author |
Bilbao, L. Bernal, L. Linhart, J.G. Verri, G. |
| author_facet |
Bilbao, L. Bernal, L. Linhart, J.G. Verri, G. |
| author_sort |
Bilbao, L. |
| title |
DT ignition in a Z pinch compressed by an imploding liner |
| title_short |
DT ignition in a Z pinch compressed by an imploding liner |
| title_full |
DT ignition in a Z pinch compressed by an imploding liner |
| title_fullStr |
DT ignition in a Z pinch compressed by an imploding liner |
| title_full_unstemmed |
DT ignition in a Z pinch compressed by an imploding liner |
| title_sort |
dt ignition in a z pinch compressed by an imploding liner |
| url |
http://hdl.handle.net/20.500.12110/paper_00295515_v41_n11_p1551_Bilbao |
| work_keys_str_mv |
AT bilbaol dtignitioninazpinchcompressedbyanimplodingliner AT bernall dtignitioninazpinchcompressedbyanimplodingliner AT linhartjg dtignitioninazpinchcompressedbyanimplodingliner AT verrig dtignitioninazpinchcompressedbyanimplodingliner |
| _version_ |
1807324115862814720 |