Difference between revisions of "Light guide"
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light guide glued to the PMT and coupled with optical grease to the lead glass block leads to a 2.5 times higher light output. The light guide | light guide glued to the PMT and coupled with optical grease to the lead glass block leads to a 2.5 times higher light output. The light guide | ||
is wrapped in aluminized mylar. | is wrapped in aluminized mylar. | ||
| − | <br> | + | <br><br> |
PMT response with air-gap:<br> | PMT response with air-gap:<br> | ||
| − | [[Image:cosmics_response_airgap.jpg]]<br> | + | [[Image:cosmics_response_airgap.jpg]] |
| − | + | <br><br> | |
| − | PMT response with light-guide. | + | PMT response with light-guide.<br> |
[[Image:cosmics_response_LGwrapped.jpg]]<br> | [[Image:cosmics_response_LGwrapped.jpg]]<br> | ||
Latest revision as of 14:43, 5 February 2008
--- Cosmic ray data ---
We take cosmic ray data on a lead glass block with FEU-84-3 PMTs attached on both ends. The bases are regular resistor voltage deviders. Data are taken with several configurations. Comparing the response of the PMT when having an air-gap (like in RadPhi) to having a 3.7cm long
light guide glued to the PMT and coupled with optical grease to the lead glass block leads to a 2.5 times higher light output. The light guide
is wrapped in aluminized mylar.
PMT response with air-gap:
PMT response with light-guide.
