Abstract
The PMTs of the CMS Hadron Forward calorimeter were found to generate a large size signal when their windows were traversed by energetic charged particles. This signal, which is due to erenkov light production at the PMT window, could interfere with the calorimeter signal and mislead the measurements. In order to find a viable solution to this problem, the response of four different types of PMTs to muons traversing their windows at different orientations is measured at the H2 beam-line at CERN. Certain kinds of PMTs with thinner windows show significantly lower response to direct muon incidence. For the four anode PMT, a simple and powerful algorithm to identify such events and recover the PMT signal using the signals of the quadrants without window hits is also presented. For the measurement of PMT responses to erenkov light, the Hadron Forward calorimeter signal was mimicked by two different setups in electron beams and the PMT performances were compared with each other. Superior performance of particular PMTs was observed.
| Original language | English (US) |
|---|---|
| Journal | Journal of Instrumentation |
| Volume | 5 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2010 |
Keywords
- Calorimeters
- Cherenkov and transition radiation
- Cherenkov detectors
- Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others)
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In: Journal of Instrumentation, Vol. 5, No. 6, 2010.
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TY - JOUR
T1 - Study of various photomultiplier tubes with muon beams and erenkov light produced in electron showers
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AU - Bodek, A.
AU - Chung, Y. S.
AU - De Barbaro, P.
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PY - 2010
Y1 - 2010
N2 - The PMTs of the CMS Hadron Forward calorimeter were found to generate a large size signal when their windows were traversed by energetic charged particles. This signal, which is due to erenkov light production at the PMT window, could interfere with the calorimeter signal and mislead the measurements. In order to find a viable solution to this problem, the response of four different types of PMTs to muons traversing their windows at different orientations is measured at the H2 beam-line at CERN. Certain kinds of PMTs with thinner windows show significantly lower response to direct muon incidence. For the four anode PMT, a simple and powerful algorithm to identify such events and recover the PMT signal using the signals of the quadrants without window hits is also presented. For the measurement of PMT responses to erenkov light, the Hadron Forward calorimeter signal was mimicked by two different setups in electron beams and the PMT performances were compared with each other. Superior performance of particular PMTs was observed.
AB - The PMTs of the CMS Hadron Forward calorimeter were found to generate a large size signal when their windows were traversed by energetic charged particles. This signal, which is due to erenkov light production at the PMT window, could interfere with the calorimeter signal and mislead the measurements. In order to find a viable solution to this problem, the response of four different types of PMTs to muons traversing their windows at different orientations is measured at the H2 beam-line at CERN. Certain kinds of PMTs with thinner windows show significantly lower response to direct muon incidence. For the four anode PMT, a simple and powerful algorithm to identify such events and recover the PMT signal using the signals of the quadrants without window hits is also presented. For the measurement of PMT responses to erenkov light, the Hadron Forward calorimeter signal was mimicked by two different setups in electron beams and the PMT performances were compared with each other. Superior performance of particular PMTs was observed.
KW - Calorimeters
KW - Cherenkov and transition radiation
KW - Cherenkov detectors
KW - Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others)
UR - http://www.scopus.com/inward/record.url?scp=77954255100&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954255100&partnerID=8YFLogxK
U2 - 10.1088/1748-0221/5/06/P06002
DO - 10.1088/1748-0221/5/06/P06002
M3 - Article
AN - SCOPUS:77954255100
SN - 1748-0221
VL - 5
JO - Journal of Instrumentation
JF - Journal of Instrumentation
IS - 6
ER -