Diamond detector for beam profile monitoring in COMET experiment at J-PARC

M. C̆erv,a P. Sarin,b,1 H. Pernegger,a P. Vageeswaranb and E. Griesmayerc

aCERN PH, Geneva, Swizerland
bIndian Institute of Technology, Bombay, India
cVienna University of Technology, Vienna, Austria

JINST 10 (2015) 06, C06016
6/30/15
https://doi.org/10.1088/1748-0221/10/06/C06016

We present the design and initial prototype results of a proton beam profile monitor for the COMET experiment at J-PARC. The goal of COMET is to look for charged lepton flavor violation by direct μ to e conversion at a sensitivity of 10−19. The 8 GeV proton beam pulsed at 100 ns with 1010 protons/s will be used to create muons through pion production and decay. In the final experiment, the proton flux will be raised to 1014 protons/s to increase the sensitivity. These requirements of harsh radiation tolerance and fast readout make diamond a good choice for constructing a beam profile monitor in COMET. We present first results of the characterization of single crystal diamond (scCVD) sourced from a new company 2A SYSTEMS Singapore. Our measurements indicate excellent charge collection and high carrier mobility down to cryogenic temperatures.

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