A New Microchannel-Plate Neutron Time-of-Flight Detector
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1 A New Microchannel-Plate Neutron Time-of-Flight Detector MCP ntof at.3 m T i ratio T i 1.8-m ntof/ T i MCP ntof Average = 1. rms =.% 1 1 Shot number V. Yu. Glebov University of Rochester Laboratory for Laser Energetics CEA NNSA Joint Diagnostic Meeting Rochester, NY 9 3 June 16 1
2 Summary A new microchannel-plate neutron time-of-flight (MCP ntof) detector was developed and tested on OMEGA The MCP ntof has only a MCP photomultiplier tube without a scintillator; the signal is produced as a result of direct neutron interaction with the MCP Eliminating the scintillator removes the scintillator decay from the instrument response function (IRF) and makes the detector faster; the MCP ntof is the fastest ntof detector currently in use on OMEGA The MCP ntof is practically insensitive to DD neutrons and can be used only for yield and ion-temperature (T i ) measurements in highyield DT shots The MCP ntof was tested.3 m from the target, but will be permanently moved to 1.9 m to improve T i measurement precision E78
3 The MCP ntof consists of a thin Al housing with a Photek* PMT14 photomultiplier A 1-mm-thick lead plate can be attached in the front Photek PMT14 single-stage MCP Hamamatsu MCP parameters effective diameter: 4 mm pore diameter: 1 nm pore pitch: 1 nm thickness:. mm MCP ntof at.3 m on OMEGA with lead plate attached E79 *Photek Ltd., East Sussex, UK TN38 9NS, see 3
4 The MCP ntof was tested on OMEGA at.3 m from the target with and without lead shielding 4 8 Shot 8138, Y = MCP ntof scintillator signal Ch1 x n,c DT No lead 4 8 Shot 8136, Y = MCP ntof scintillator signal Ch1 x n,c DT 1-mm lead MCP ntof detail of Ch3 MCP ntof detail of Ch3 1 The MCP ntof will be used with 1-mm lead shielding E8 4
5 The MCP ntof is practically insensitive to DD neutrons Shot with a DD yield of MCP ntof scintillator signal Ch The typical MCP lead glass* is 48% Pb, % O, and 18% Si Neutrons produced charge particles through (n, p) and (n, a) reactions For Pb, O, and Si threshold of proton and alpha production are above. MeV E81a *S. S. Medley and R. Persing, Rev. Sci. Instrum., 1463 (1981).
6 The MCP ntof signal is fitted by a convolution of a Gaussian and an exponential decay function Shot 81387, Y = The PMT14 was run at 3. kv with a gain of ~4 The signal was split into four channels of a DPO 714 scope m of LMR-4 cable was used The fit was used up to % of the falling slope 1 A t t t t / * 1 ^ v ^ 1 v x mt ^ h = exp ; h E h # exp 1 erf x x c m* + > H4 v E8 *T. J. Murphy et al., Rev. Sci. Instrum 86, 61 (1997). 6
7 The current configuration of the MCP ntof is the fastest ntof detector on OMEGA Shot 8, DT, T = , T i =.6 kev MCP ntof at.3 m.-m CVD* Signal Rise Fall FWHM** Time =.13 Response =.3 ns Signal Rise Fall FWHM Time =.41 Response =.6 ns T i = 7.41 Charge 1 = pc T i = 7.39 Charge 1 = 43.9 pc E83 *CVD: chemical-vapor deposition **FWHM: full width at half maximum 7
8 The yield inferred from the MCP ntof was calibrated against the Cu activation diagnostic Change (pc) 1 1 MCP ntof Linear fit 4 6 Yied ratio Y MCP /Y Cu Average =.998 rms = 1.3% 1 1 Cu DT neutron yield ( 1 13 ) Shot number All data are from the implosion of glass shell targets filled with DT. E84 8
9 The IRF of the MCP ntof was adjusted to match the T i of the 1.8-m ntof detector T i (kev) from MCP ntof T i data Function y = x T i ratio T i 1.8-m ntof/ T i MCP ntof 1 Average = 1. rms =.% 1 T i (kev) from 1.8-m ntof Shot number The MCP ntof is a promising detector for T i measurements. E8 9
10 In May 16 the MCP ntof was permanently relocated to 1.9 m from target chamber center (TCC) in the P4F line of sight PD4 1.4-m ntof PMT m MCP ntof N OMEGA Target Bay MCP ntof installed E86 1
11 Summary/Conclusions A new microchannel-plate neutron time-of-flight (MCP ntof) detector was developed and tested on OMEGA The MCP ntof has only a MCP photomultiplier tube without a scintillator; the signal is produced as a result of direct neutron interaction with the MCP Eliminating the scintillator removes the scintillator decay from the instrument response function (IRF) and makes the detector faster; the MCP ntof is the fastest ntof detector currently in use on OMEGA The MCP ntof is practically insensitive to DD neutrons and can be used only for yield and ion-temperature (T i ) measurements in highyield DT shots The MCP ntof was tested.3 m from the target, but will be permanently moved to 1.9 m to improve T i measurement precision E78 11
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