The PHENIX MPC-EX is an W/Si pre-shower detector operating at small angles with respect to the beam in the Relativistic Heavy Ion Collider (RHIC). The Si Mini-Pad sensors are the active element of the detector. The expected hadron flux to the Si Mini-Pad sensors will generate significant non-ionizing energy loss in the sensors, which may damage the crystalline structure of the sensor’s bulk material. We investigated the nature of the hadron flux to the Si Mini-Pad sensors through a full simulation and determined its effect on the sensor’s characteristics based on a beam test. The investigation showed key issues in designing a preshower detector using silicon sensors and operating under a large neutron fluence and offered valuable information on the operation of the MPC-EX detector.
Bibliographical noteFunding Information:
The authors would like to thank Topsil’s silicon scientist Leif Jensen for providing the detailed wafer’s characteristics, Kodis’s chief technical engineer Sung Ho Lee for providing details on wafer dicing, and KIRAMS’s staff members for their kind assistance in the irradiation process. We acknowledge support of the work at Brookhaven National Lab by the U.S. Department of Energy, Office of Nuclear Physics, under Prime Contract No. DE-AC02-98CH10886, at Chonbuk National University by the National Research Foundation of Korea NRF-2011-0014045, at Ewha Womans University by the National Research Foundation of Korea NRF-2012M7A1A2055625, at Iowa State University under DOE Grant DE-FG02-10ER41719, at Myongji University by the National Research Foundation of Korea NRF-2013-R1A1A2011572, at Sungkyunkwan University by the ICT R&D program of MSIP/KEIT 10043897, at Xi-angtan University by the Chinese 973 Program, and at Yonsei University by the National Research Foundation of Korea NRF-2011-0011774.
© 2014, The Korean Physical Society.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)