Photodetection Discussion

Friday 16 Sept 2022, 13:00 → 14:00 US/Eastern

PMTs - maybe not enough space

 

SiPMs

 

Can dope with xenon?  Or other wavelength shifter?

 

Hybrid detector?  

 

ARAPUCA (X-ARAPUCA to be implemented in ProtoDUNE.) Photon is trapped through wavelength-shifting and dichroic short-pass filters; readout by one or more internal SiPMs.

 

Milind: Icarus PMTs with TPB get 90 PE/MeV

 

Steve: We saw gain drifts in these PMTs in MC

 

Milind: That's due to the large amount of light, which decreases gain over time.  Way to mitigate this is to decrease gain - less gain, slower degredation.
This may be a good solution for us, since we probably need much less than 90 PE/MeV.

 

Hybrid photodetector - bulb, photocathode with tiny silicon detector to create focusing field.
ABALONE.  Aleksey to find information and send to group?

 

7 pages, 9 figures, LIDINE 2021: LIght Detection In Noble Elements
Subjects: Instrumentation and Detectors (physics.ins-det); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:2111.02924 [physics.ins-det]
 (or arXiv:2111.02924v2 [physics.ins-det] for this version)

 

Milind: We have some money for R&D with a company working on ARAPUCA-based devices.

 

Sergio: In principle, SiPM-based devices can have few-nanosecond timing with sensitive SiPMs.  This is scalable by size.  Same can be achieved with multiple SiPMs.

 

DUNE ND design is wavelength-shifter plate with SiPMs.  We could use this approach.  Could combine with X-ARAPUCA concept.

Alejandro has been working on photodetection for HyperK.  Can ask him to study these options.