ENTRY C1937 20120727 C121C193700000001 SUBENT C1937001 20120727 C121C193700100001 BIB 10 50 C193700100002 TITLE Determination of the deuterium-tritium branching C193700100003 ratio based on inertial confinement fusion implosions C193700100004 AUTHOR (Y.Kim,J.M.Mack,H.W.Herrmann,C.S.Young,G.M.Hale, C193700100005 A.McEvoy,S.Caldwell,N.M.Hoffman,S.C.Evans,T.J.Sedillo, C193700100006 J.Langenbrunner,H.H.Hsu,M.A.Huff,S.Batha,C.J.Horsfield,C193700100007 M.S.Rubery,W.J.Garbett,W.Stoeffl,E.Grafil,L.Bernstein, C193700100008 J.A.Church,D.B.Sayre,M.J.Rosenberg,C.Waugh, C193700100009 H.G.Rinderknecht,M.Gatu Johnson,A.B.Zylstra, C193700100010 J.A.Frenje,D.T.Casey,R.D.Petrasso,E.Kirk Miller, C193700100011 V.Yu.Glebov,C.Stoeckl,T.C.Sangster) C193700100012 INSTITUTE (1USALAS,2UK ALD,1USALRL,1USAMIT,1USAROC) C193700100013 (1USAUSA) Special Technologies Laboratory, Santa C193700100014 Barbara, California C193700100015 REFERENCE (J,PR/C,85,061601,2012) C193700100016 REL-REF (M,,V.Yu.Glebov+,J,RSI,75,3559,2004) Neutron detector C193700100017 described. C193700100018 FACILITY (LASER,1USAROC) Measurement performed at the C193700100019 University of Rochester OMEGA Laser Facility. C193700100020 SAMPLE The target was a CH plastic shell of thickness 15 - C193700100021 30 mu-m and an outer diameter of approximately 1 mm, C193700100022 filled with 15 atm of gaseous D-T fuel in a ratio of C193700100023 D/T approx. 65/35. C193700100024 METHOD D-T reaction under condition of inertial confinement C193700100025 fusion (ICF) was used to determine n/gamma branching. C193700100026 To achieve D+T implosions, 60 laser beams at wavelengthC193700100027 of 351 nm, with a total energy of 23 - 28 kJ, were C193700100028 focused on the target at chamber center (TCC) for a C193700100029 duration of 1 ns. Gamma rays produced in D+T->5He C193700100030 reaction and neutrons produced in D+T -> 4He + n C193700100031 were directly measured. C193700100032 DETECTOR Two gas Cherenkov detectors were used to detect high C193700100033 energy gamma rays. One of them used 1.5-cm-thick and C193700100034 7-cm-diameter beryllium disk to convert gamma rays to C193700100035 Compton electrons and pressurized CO2 (variable up to C193700100036 100 psi) as Cherenkov radiator. Cherenkov light was C193700100037 relayed via Cassegranian optics to a Photek ultrafast C193700100038 microchannel-plate photomultiplier tube (MCP). CO2 gas C193700100039 pressure was fixed at 100 psia corresponding to a C193700100040 Cherenkov production energy threshold of 6.3 MeV. C193700100041 The second Cherenkov counter used Al converter and SF6 C193700100042 gas at pressure of 87 psia as Cherenkov radiator. C193700100043 Energy threshold was 5 MeV. C193700100044 (SCIN) Neutrons from D+T reaction were detected using C193700100045 ultrafast scintillators BC-422 and BC-422Q coupled to C193700100046 either a single-stage (gain up to 1E+3) MCP PMT and/or C193700100047 a two-stage (gain up to 1E+6) MCP PMT. C193700100048 Another neutron detector prototype was based on a C193700100049 synthetic diamond wafer produced by the chemical vapor C193700100050 deposition. C193700100051 HISTORY (20120727C) Compiled by S.H. C193700100052 ENDBIB 50 0 C193700100053 NOCOMMON 0 0 C193700100054 ENDSUBENT 53 0 C193700199999 SUBENT C1937002 20120727 C121C193700200001 BIB 3 6 C193700200002 REACTION ((1-H-3(D,N)2-HE-4,,SIG,,AV)/ C193700200003 (1-H-3(D,G)2-HE-5,,SIG,,AV)) C193700200004 STATUS (TABLE) Data taken from abstract of the reference C193700200005 ERR-ANALYS (ERR-S) Statistical uncertainty C193700200006 (ERR-SYS) Systematic uncertainty C193700200007 (ERR-T) Total uncertainty C193700200008 ENDBIB 6 0 C193700200009 COMMON 2 3 C193700200010 ERR-S ERR-SYS C193700200011 PER-CENT PER-CENT C193700200012 7.3 33.9 C193700200013 ENDCOMMON 3 0 C193700200014 DATA 4 1 C193700200015 EN-MIN EN-MAX DATA ERR-T C193700200016 KEV KEV NO-DIM NO-DIM C193700200017 23.0 40.0 4.2E-05 2.0E-05 C193700200018 ENDDATA 3 0 C193700200019 ENDSUBENT 18 0 C193700299999 ENDENTRY 2 0 C193799999999