Diagnosing fuel {rho}R and {rho}R asymmetries in cryogenic deuterium-tritium implosions using charged-particle spectrometry at OMEGA
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
Determining fuel areal density ({rho}R) in moderate-{rho}R (100-200 mg/cm{sup 2}) cryogenic deuterium-tritium (DT) implosions is challenging as it requires new spectrometry techniques and analysis methods to be developed. In this paper, we describe a new method for analyzing the spectrum of knock-on deuterons (KO-Ds), elastically scattered by primary DT neutrons, from which a fuel {rho}R can be inferred for values up to {approx}200 mg/cm{sup 2}. This new analysis method, which uses Monte Carlo modeling of a cryogenic DT implosion, improves significantly the previous analysis method in two fundamental ways. First, it is not affected by significant spatial-yield variations, which degrade the diagnosis of the fuel {rho}R (spatial yield variations of about {+-}20% are typically observed), and second, it does not break down when the fuel {rho}R exceeds {approx}70 mg/cm{sup 2}.
- OSTI ID:
- 21277015
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 4; Other Information: DOI: 10.1063/1.3098540; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diagnosing implosion velocity and ablator dynamics at NIF (u)
Design of an electronic charged particle spectrometer for measuring ({rho}R), yield, and implosion symmetry on the Omega upgrade