1 GRH Gas Cerenkov Diagnostics Workshop on Nuclear Physics in Hot Dense Plasmas Los Alamos and Lawrence Livermore National Laboratories – National Ignition Campaign This work performed under the auspices of the U.S. DOE by Los Alamos and Lawrence Livermore National Laboratories under Contracts DE-AC52-06NA25396 and DE-AC52-07NA27344 LLNL-PRES-478331 Wolfgang Stoeffl Lawrence Livermore National Laboratory And the GRH Team
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1
GRH Gas Cerenkov Diagnostics
Workshop on Nuclear Physics in Hot Dense Plasmas
Los Alamos and Lawrence Livermore National Laboratories – National Ignition Campaign
This work performed under the auspices of the U.S. DOE by Los Alamos and Lawrence Livermore National Laboratories under Contracts DE-AC52-06NA25396 and DE-AC52-07NA27344
LLNL-PRES-478331
Wolfgang Stoeffl
Lawrence Livermore National Laboratory
And the GRH Team
Acknowledgments, the fabulous GRH team
Hans Herrmann, Y.H. Kim, N. Hoffman, A. McEvoy, D.C. Wilson, C.S. Young,
J.M. Mack, J.R. Langenbrunner, S. Evans, T. Sedillo, S. Batha,…
Los Alamos Nat’l Lab
W.Stoeffl,L. Bernstein, P. Watts, A. Lee, J. Celeste, T. Thomas, G. Holtmeier, S. Poor, L. Dauffy, S. Azevedo, J. Liebman and the NIF Team
Lawrence Livermore Nat’l Lab
C.J. Horsfield, M. Rubery, W. Garbett
Atomic Weapons Establishment
E.K. Miller, R. Malone, M. Kaufman, B. Cox, Z. Ali, T. Tunnell,…
Nat’l Security Technologies
E. Grafil
CO School of Mines
V. Yu. Glebov, T. Duffy and the OMEGA Team
Laboratory for Laser Energetics
Four identical cells --
-- Variable gas pressure
-- Tunable Gamma Threshold
100 ps response time
10 ps relative accuracy
The GRH
Cherenkov
Detector
at NIF
Fusion gamma rays provide the most
undisturbed diagnostic of the NIF fuel burn
Gamma-Rays provide the opportunity to measure:
• Fusion Reaction History
— Bang-Time & Burn-Width
• Yields of various nuclear reactions from which to infer:
— Total DT neutron yield
— Plastic Ablator Areal Density (R)
— Possibly: Hot Spot Composition?
— Fuel R?, Mix?, …
ICF Gamma-Ray Diagnostics:
• have been well demonstrated on OMEGA
• are now operating on NIF
GRH Summary
155 psia CO2 (N101030,D)
Vacuum (N100923,B)
DT
Snout n- ChernenkovS
ign
al (a
.u.)
Fusion Reaction History can be determined through time-
resolved measurements of escaping fusion products
• Bang Time - used to establish
laser energy coupling to target
(shell velocity)
• Burn Width - used tuning • and many other uses
D + T 5He*
Neutrons or
Gammas
Foot
Time
Reacti
on
Rate
Burn
Width
Dopplerbroadened
no escape(hopefully)
)5.3()1.14(1~
MeVMeVn
nMeVHe )75.16(553e~
ITF I0S3 v
v0
8
0
4
11.2Rhotspot
Kwtd
Rhotspot
4
Mclean
MDT
0.5
Mach
Zehnder
For NIF, GRH diagnostics have been optimized to measure