Investigation of surface homogeneity of mirrors for the CBM-RICH detector and low-mass di-electron feasibility studies

FAIR NExt generation of ScientistS 2013

Lebedeva, E.^1 ; Hoehne, C.^1

Justuts-Liebig University Giessen, Germany^1

关键词: Compressed baryonic matters;    Electron identification;    Electron measurements;    Feasibility studies;    Heavy ion collision;    Moderate temperature;    Realistic detectors;    Transition radiation detectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/503/1/012002/pdf
DOI  :  10.1088/1742-6596/503/1/012002

来源: IOP

【 摘 要 】

The Compressed Baryonic Matter (CBM) experiment at the future FAIR facility will investigate high net-baryon density matter at moderate temperatures in A+A collisions from 4-45 AGeV. One of the key observables of the CBM physics program is electromagnetic radiation as a probe of strongly interacting matter in heavy-ion collisions, carrying undistorted information on its conditions to the detector. This includes detailed investigations of low-mass vector mesons in their di-electron channel. A clean and efficient identification of electrons is required for such measurements. In CBM the electron identification will be performed by a Ring Imaging Cherenkov detector and several layers of Transition Radiation Detectors. The RICH detector will be operated with CO2radiator gas, MAPMTs as photodetector and spherical glass mirrors as focusing elements. A high quality of the mirrors in terms of reflectivity and surface homogeneity is required. In the first part of the contribution results on measurements of the mirror surface homogeneity are presented. Results on the feasibility studies of low-mass di-electron measurements with realistic detector response are discussed in the second part of the contribution.