Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session X13: Particle Accelerators and Technologies
10:45 AM–12:21 PM,
Tuesday, April 16, 2019
Sheraton
Room: Plaza Court 2
Sponsoring
Unit:
DPB
Chair: Vladimir Shiltsev, Fermi National Accelerator Laboratory
Abstract: X13.00004 : Unidirectional Focusing Dipole Magnet as a Gamma-Ray Spectrometer in the Intermediate MeV Range*
11:21 AM–11:33 AM
Presenter:
Ganesh Tiwari
(University of Texas at Austin)
Authors:
Ganesh Tiwari
(University of Texas at Austin)
Rotem Kupfer
(University of Texas at Austin)
Xuejing Jiao
(University of Texas at Austin)
Joseph Shaw
(University of Texas at Austin)
Andrea Hannasch
(University of Texas at Austin)
Erhard Gaul
(University of Texas at Austin)
Michael C Downer
(University of Texas at Austin)
Bjorn Manuel Hegelich
(University of Texas at Austin, Gwangju Institute of Science and Technology)
We report on the design of a compact electron and positron spectrometer based on tapered NdFeB magnets. Using RADIA and fourth order Runge-Kutta Particle Tracking code, we show that the tapered design forms a gradient-magnetic field component allowing energy dependent focusing of the dispersed charged particles along a chosen detector plane. We address the effect of incident beam divergence on the efficiency and resolution of the detector. We demonstrate a prototype matching the design specifications and discuss the adaptation of the prototype for the detection of gamma-ray in the multi-MeV range. We confirm the energy transfer of gamma-ray to electrons and positrons via Compton Scattering and Pair Production in a low or intermediate Z-converter by using Monte Carlo based FLUKA simulations. We show that for suitable thickness of the converter, the incident gamma-ray energy spectrum directly correlates with the spectrum of electrons and positrons in a constrict acceptance angle. We investigate the effects of divergence on the spectral deconvolution of incident gamma photon. We present the first series of data obtained with this spectrometer at Texas Petawatt Facility.
*Air Force Office of Scientific Research (FA9550-14-1-0045, FA9550-17-1-0264)
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