Difference between revisions of "MainPage:Nuclear:Summer2012:QuantumEfficiency"
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== Quantum Efficiency == | == Quantum Efficiency == | ||
| − | Every PMT has a so-called "quantum efficiency" associated with it. These is the efficiency of the PMT photocathode window converting photons into electrons quantum mechanically via the photoelectric effect. Typically these percentages hover around ~20%. In any case, it is an important property to know about the PMTs that will be used for the Kaon Aerogel Cherenkov Detector. | + | Every PMT has a so-called "quantum efficiency" associated with it. These is the efficiency of the PMT photocathode window converting photons into electrons quantum mechanically via the photoelectric effect. |
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| + | Typically these percentages hover around ~20%. In any case, it is an important property to know about the PMTs that will be used for the Kaon Aerogel Cherenkov Detector. | ||
== JLab-Yerevan Results == | == JLab-Yerevan Results == | ||
| − | Tests have been conducted at JLab by our collaborators in the Yerevan group that characterize the quantum efficiency of our PMTs. The PMTs that we plan to use were used in the BLAST experiment at MIT/Bates. The test was a relative quantum efficiency test and it compared the BLAST PMTs to spare HMS PMTs that had not been used. | + | Tests have been conducted at JLab by our collaborators in the Yerevan group that characterize the quantum efficiency of our PMTs. The PMTs that we plan to use were used in the BLAST experiment at MIT/Bates. The test was a relative quantum efficiency test and it compared the BLAST PMTs to spare HMS PMTs that had not been used. T |
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| + | he results were quite interesting. Hopefully, you may view their plot below. Figure credit goes to Dr. Hamlet Mkrtchyan and the Yerevan Group. I took the figure from their eLog. | ||
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| + | {| border="0" style="text-align:center;" width="100%" | ||
| + | |- | ||
| + | | style="width: 100%;" | [[File:quantumeff.png|x200px|Scanning Setup]] | ||
| + | |} | ||
Revision as of 17:52, 27 June 2012
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Quantum Efficiency
Every PMT has a so-called "quantum efficiency" associated with it. These is the efficiency of the PMT photocathode window converting photons into electrons quantum mechanically via the photoelectric effect.
Typically these percentages hover around ~20%. In any case, it is an important property to know about the PMTs that will be used for the Kaon Aerogel Cherenkov Detector.
JLab-Yerevan Results
Tests have been conducted at JLab by our collaborators in the Yerevan group that characterize the quantum efficiency of our PMTs. The PMTs that we plan to use were used in the BLAST experiment at MIT/Bates. The test was a relative quantum efficiency test and it compared the BLAST PMTs to spare HMS PMTs that had not been used. T
he results were quite interesting. Hopefully, you may view their plot below. Figure credit goes to Dr. Hamlet Mkrtchyan and the Yerevan Group. I took the figure from their eLog.
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