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Charge-collection efficiency of single-crystal CVD diamond detector for low-energy charged particles with energies ranging from 100 keV to 2 MeV

Sato, Yuki  ; Murakami, Hiroyuki*; Shimaoka, Takehiro*; Tsubota, Masakatsu*; Kaneko, Junichi* 

The performance of a diamond detector created from a single-crystal diamond grown by chemical vapor deposition was studied for application in detecting charged particles having energies ranging from 100 keV to 2 MeV. Energy peaks of these low-energy ions were clearly observed. However, we observed that the pulse height for individual incident ions decreases with increasing atomic number of the ions. We estimated the charge collection efficiency of the generated charge carriers by the incident charged particles. While charge collection efficiency above 95% is achieved for helium (He$$^+$$) at energies above 1.5 MeV, over the same incident energy range, the efficiencies are lower for heavy-ions: $$sim$$70% for silicon (Si$$^+$$) and $$sim$$30% for gold (Au$$^{3+}$$). We also found that the charge collection efficiency decreases as the generated charge density inside the diamond crystal increases.



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Category:Instruments & Instrumentation



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