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

Abstract

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 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/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.

Nonlithographic Formation of Ta2O5 Nanodimple Arrays Using Electrochemical Anodization and Their Use in Plasmonic Photocatalysis for Enhancement of Local Field and Catalytic Activity

“…The conversion of the Ta nanodimples to its analogous oxide or nitride opens up a huge array of applications for the nanodimples, such as serving as a base for UV-transparent superhydrophobic coatings, as the active layer in photodiodes for charged particle radiation detection, as a photocatalyst and electrocatalyst to leverage the simultaneously high oxidizing and reducing power of photogenerated holes and electrons, as a catalyst for the rate capability enhancement of lithium sulfur batteries, as a platform for plasmonic hot carrier devices, and so forth. In fact, there has recently been a revival of research interest in the electronic and optoelectronic applications of ultrawide band gap materials with semiconducting properties such as Ga 2 O 3 , Ta 2 O 5 , GeO 2 , and BN. − …”