51st Annual Meeting of the APS Division of Plasma Physics
Volume 54, Number 15
Monday–Friday, November 2–6, 2009;
Atlanta, Georgia
Session NI2: ICF Capsules and Rayleigh-Taylor Instability
9:30 AM–12:30 PM,
Wednesday, November 4, 2009
Room: Centennial I
Chair: David Meyerhofer, University of Rochester
Abstract ID: BAPS.2009.DPP.NI2.4
Abstract: NI2.00004 : Measurements of the down-scattered and TT-neutron spectrum using the Magnetic Recoil Spectrometer
11:00 AM–11:30 AM
Preview Abstract
Abstract
Author:
Johan Frenje
(MIT)
Proper assembly of capsule mass, as manifested through evolution of fuel
areal density (\textit{$\rho $R}), is fundamentally important for achieving hot-spot ignition
planned at the National Ignition Facility (NIF).$^{ }$Experimental
information about \textit{$\rho $R} and \textit{$\rho $R} asymmetries, $T_{i}$ and yield is therefore
absolutely essential for understanding how assembly occurs. To obtain this
information, we have built and activated, at OMEGA, a Magnetic-Recoil
Spectrometer (MRS) whose objective is to measure the absolute neutron
spectrum in the range 5 to 30 MeV, from which \textit{$\rho $R}, $T_{i}$ and yield can be
directly inferred for energy-scaled cryogenic DT implosions. This allows for
experimental validation of the direct-drive ignition-capsule design prior to
the first experiments on the NIF. Another MRS is currently being built for
the NIF. In this talk, we present the first ever measurements of the
down-scattered neutron spectrum, from which \textit{$\rho $R} was accurately inferred for
both CH and cryogenic DT implosions. As much of the OMEGA-MRS R{\&}D is
directly applicable to the NIF-MRS, the MRS activities on the NIF are
presented as well. In addition, high-resolution measurements of the DT and
TT-neutron spectrum have recently been performed to address, for the first
time, important science questions regarding non-thermal components in the
DT-neutron spectrum, as well as the possible existence of the TT-two-body
reaction, at low energies, producing a neutron peak at about 9 MeV. This
work was supported in part by the U.S. Department of Energy (Grant No.
DE-FG03-03SF22691), LLE (subcontract Grant No. 412160-001G), LLNL
(subcontract Grant No. B504974). Contributors: D.Casey, C.Li, F.S\'{e}guin,
N.Sinenian, R.Petrasso, MIT, V.Glebov, T.Sangster, D.Meyerhofer, LLE-UR,
S.Hatchett, S.Haan, C.Cerjan, M.Eckart, H.Kather, O.Landen, M. Moran, LLNL,
K. Fletcher, \textit{Suny Geneseo, and }R. Leeper, SNL.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DPP.NI2.4