Pulse height reduction effects of single-crystal CVD diamond detector for low-energy heavy ions

¹ The Institute of Physical and Chemical Research (RIKEN) - 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
² Graduate School of Engineering, Hokkaido University - N13, W8, Kita- ku, Sapporo 060-8628, Japan
³ National Institute of Advanced Industrial Science and Technology (AIST) - 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

Received: 3 September 2013
Accepted: 28 October 2013

Abstract

The performance of a diamond detector made of single-crystal diamond grown by chemical vapour deposition was studied for heavy ions, having energy of 3 MeV. Energy peaks of these low-energy ions were clearly observed. However, the pulse height for individual incident ion decreases with increasing atomic number of the ions. For understanding this pulse height reduction effect, we calculated the amount of ionizing and non-ionizing energy loss of incident ions in the diamond detector. The results of our calculation suggest the contribution of charge loss mechanisms other than the recombination effect of electron-hole pairs produced along the ionized track. We also mentioned the incomplete charge collection near the boundary region between the metal electrode and the diamond surface.