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

TL;DR

This paper introduces a diamond pixel detector designed for beam profile monitoring in the COMET experiment at J-PARC, demonstrating promising initial prototype results suitable for high-radiation, fast-readout environments.

Contribution

The paper presents the design and initial characterization of a diamond pixel detector specifically for beam profile monitoring in a high-intensity, radiation-rich environment.

Findings

High charge collection efficiency in diamond sensor

Excellent carrier mobility at cryogenic temperatures

Suitable for harsh radiation and fast readout requirements

Abstract

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 $10^{10}$ protons/s will be used to create muons through pion production and decay. In the final experiment, the proton flux will be raised to $10^{14}$ 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.