TY - JOUR
T1 - A study on ion initiated photomultiplier afterpulses
AU - Akchurin, Nural
AU - Kim, Heejong
PY - 2007/4/21
Y1 - 2007/4/21
N2 - Ions originating from the ionization of the gas impurities by the electrons inside the photomultiplier tube are generally responsible for the delayed pulses that arrive several hundred nanoseconds after the main pulse. These afterpulses are studied in detail for a Hamamatsu PMT (R7525). Their timing, amplitude, rate and high-voltage dependence are measured and monitored in a helium-rich environment for an extended period. The afterpulse rate due to helium is determined to be 5-10 × 10- 4 per ppm per photoelectron. The characteristic afterpulse features are that their rate linearly depends on the main pulse charge but the afterpulse charge itself is essentially independent of it. We discuss the timing distribution and the origin of these afterpulses.
AB - Ions originating from the ionization of the gas impurities by the electrons inside the photomultiplier tube are generally responsible for the delayed pulses that arrive several hundred nanoseconds after the main pulse. These afterpulses are studied in detail for a Hamamatsu PMT (R7525). Their timing, amplitude, rate and high-voltage dependence are measured and monitored in a helium-rich environment for an extended period. The afterpulse rate due to helium is determined to be 5-10 × 10- 4 per ppm per photoelectron. The characteristic afterpulse features are that their rate linearly depends on the main pulse charge but the afterpulse charge itself is essentially independent of it. We discuss the timing distribution and the origin of these afterpulses.
KW - Afterpulse
KW - Helium ion
KW - Photomultiplier tube
UR - http://www.scopus.com/inward/record.url?scp=33947695802&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2007.01.093
DO - 10.1016/j.nima.2007.01.093
M3 - Article
AN - SCOPUS:33947695802
SN - 0168-9002
VL - 574
SP - 121
EP - 126
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
ER -