We present the design and initial prototype results of a pixellized 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 muon to electron conversion at a sensitivity of 0−19. An 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/sec 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 efficiency and high carrier mobility down to cryogenic temperatures.
@article{arxiv.1411.4122,
title = {Diamond pixel detector for beam profile monitoring in COMET experiment at J-PARC},
author = {M. Cerv and P. Sarin and H. Pernegger and P. Vageesvaran and E. Griesmayer},
journal= {arXiv preprint arXiv:1411.4122},
year = {2014}
}