NIC-XIV School 2016

Development of high time resolution detector for RI beam using Cherenkov light

15 Jun 2016, 16:10

10m

Library Hall, Central Library (Niigata University (Ikarashi Campus))

Short Talk Students2

Speaker

Ms Eri Miyata (graduate school of science Niigata University)

Description

In order to improve the resolution of particle identification for radioactive beams, it is important to develop the high time resolution detector to measure TOF. We have developed the high time resolution TOF detector which detects the Cherenkov light emitted when RI beam passes through the high refractive index radiator. Generally, the plastic scintillation counter has been commonly used as a fast TOF detector. The fast scintillation light of an organic scintillator could be emitted with the decay time of the order of a few ns. On the other hand, Cherenkov light could be instantly emitted without de-excitation process. Therefore, it is advantageous to use Cherenkov radiation instead of scintillation to obtain the high time resolution. 　Experiments were performed at HIMAC (Heavy Ion Medical Accelerator in Chiba), NIRS. 58Ni, 82Kr and 132Xe beams of which beam energies are from 200 to 500 MeV/nucleon have been used for the test of Cherenkov detector. The methods to couple radiator and PMTs optically have been studied through the experiment and also simulation by Geant4. The time resolution of 5 ps has been achieved with 132Xe beam of 420A MeV. It has been found that the time resolution depends on the number of Cherenkov photons detected by a TOF detector. In the short talk, the experimental results will be reported and discussed.