Photosensor Work at UCSC • Concentrate on technologies that are: – Newer than conventional PMT – Now or soon in commercial production • Multianode & high QE PMT – Develop test infrastructure (also for G- APDs) – Some initial tests • Geiger-APD – Otte brings expertise & ideas from his PhD work • No financial support – Borrowed & scavenged equipment – Free undergraduate labor
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Photosensor Work at UCSC Concentrate on technologies that are: –Newer than conventional PMT –Now or soon in commercial production Multianode & high QE.
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Photosensor Work at UCSC• Concentrate on technologies that are:
– Newer than conventional PMT– Now or soon in commercial production
• Multianode & high QE PMT– Develop test infrastructure (also for G-APDs)– Some initial tests
• Geiger-APD– Otte brings expertise & ideas from his PhD work
Tests have shown that the G-APD can in principle be used:N. Otte and coworkers at MPI/PSI/ETH:Vienna Conference on Instrumentation 2007ICRC 2007NDIP 2008
4 MPPC-33-050C from Hamamatsu:sensor size: 3x3mm²single cell size: 50x50µm²nominal bias: 70.4Vdark rate at nominal bias: ~2MHzgain at nominal bias: 7.5*105
MAGIC Pixel Size
the devil is in the detail:• can costs be sufficiently reduced that
the G-APD becomes competitive to the PMT?
• optical crosstalk could limit low energy performance on trigger level
• is temperature dependence an issue?• how severe are parameter fluctuations
from device to device • …
Extensive R&D program ahead that has to figure out if the G-APD can be used to meet our
physics goals
Status and Plans at UCSC
• setting up infrastructure to evaluate G-APDs- photon detection efficiency measurements- temperature chamber- …
• MPPCs ordered from Hamamatsu• in contact with several other producers
Status:
Plans:
• test available devices• R&D on G-APD pixel for a small ACT
– towards a first comprehensive field test in 2009?
we are just beginning, especially for G-APDs
AGIS R & D Proposal:
• design of prototype camera(s), including choice of sensor(s)• how sensor features impact trigger performance• procure and test sensors for prototype camera(s)