Source:http://linkedlifedata.com/resource/pubmed/id/16196715
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| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2 Pt 2
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| pubmed:dateCreated |
2005-10-3
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| pubmed:abstractText |
We have developed wire-array z -pinch scaling relations for plasma-physics and inertial-confinement-fusion (ICF) experiments. The relations can be applied to the design of z -pinch accelerators for high-fusion-yield (approximately 0.4 GJ/shot) and inertial-fusion-energy (approximately 3 GJ/shot) research. We find that (delta(a)/delta(RT)) proportional (m/l)1/4 (Rgamma)(-1/2), where delta(a) is the imploding-sheath thickness of a wire-ablation-dominated pinch, delta(RT) is the sheath thickness of a Rayleigh-Taylor-dominated pinch, m is the total wire-array mass, l is the axial length of the array, R is the initial array radius, and gamma is a dimensionless functional of the shape of the current pulse that drives the pinch implosion. When the product Rgamma is held constant the sheath thickness is, at sufficiently large values of m/l, determined primarily by wire ablation. For an ablation-dominated pinch, we estimate that the peak radiated x-ray power P(r) proportional (I/tau(i))(3/2)Rlphigamma, where I is the peak pinch current, tau(i) is the pinch implosion time, and phi is a dimensionless functional of the current-pulse shape. This scaling relation is consistent with experiment when 13 MA < or = I < or = 20 MA, 93 ns < or = tau(i) < or = 169 ns, 10 mm < or = R < or = 20 mm, 10 mm < or = l < or = 20 mm, and 2.0 mg/cm < or = m/l < or = 7.3 mg/cm. Assuming an ablation-dominated pinch and that Rlphigamma is held constant, we find that the x-ray-power efficiency eta(x) congruent to P(r)/P(a) of a coupled pinch-accelerator system is proportional to (tau(i)P(r)(7/9 ))(-1), where P(a) is the peak accelerator power. The pinch current and accelerator power required to achieve a given value of P(r) are proportional to tau(i), and the requisite accelerator energy E(a) is proportional to tau2(i). These results suggest that the performance of an ablation-dominated pinch, and the efficiency of a coupled pinch-accelerator system, can be improved substantially by decreasing the implosion time tau(i). For an accelerator coupled to a double-pinch-driven hohlraum that drives the implosion of an ICF fuel capsule, we find that the accelerator power and energy required to achieve high-yield fusion scale as tau(i)0.36 and tau(i)1.36, respectively. Thus the accelerator requirements decrease as the implosion time is decreased. However, the x-ray-power and thermonuclear-yield efficiencies of such a coupled system increase with tau(i). We also find that increasing the anode-cathode gap of the pinch from 2 to 4 mm increases the requisite values of P(a) and E(a) by as much as a factor of 2.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Aug
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| pubmed:issn |
1539-3755
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| pubmed:author |
pubmed-author:ChandlerG AGA,
pubmed-author:CuneoM EME,
pubmed-author:FehlD LDL,
pubmed-author:GillilandT LTL,
pubmed-author:IvesH CHC,
pubmed-author:LeeperR JRJ,
pubmed-author:MatzenM KMK,
pubmed-author:MazarakisM GMG,
pubmed-author:McDanielD HDH,
pubmed-author:McGurnJ SJS,
pubmed-author:McKenneyJ LJL,
pubmed-author:MuronD JDJ,
pubmed-author:OlsonC LCL,
pubmed-author:PorterJ LJL,
pubmed-author:RamirezJ JJJ,
pubmed-author:SeamenJ FJF,
pubmed-author:SpeasC SCS,
pubmed-author:SpielmanR BRB,
pubmed-author:StruveK WKW,
pubmed-author:StygarW AWA,
pubmed-author:TorreyJ CJC,
pubmed-author:VeseyR ARA,
pubmed-author:WagonerT CTC,
pubmed-author:WaismanE MEM
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| pubmed:issnType |
Print
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| pubmed:volume |
72
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
026404
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| pubmed:year |
2005
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| pubmed:articleTitle |
Theoretical z -pinch scaling relations for thermonuclear-fusion experiments.
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| pubmed:affiliation |
Sandia National Laboratories, Albuquerque, New Mexico 87185-1196, USA.
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| pubmed:publicationType |
Journal Article
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