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POLAR-2 biweekly meeting
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Europe/Zurich
Description
Agenda:
- Update Merlin on CSU + scintillators
- Update Nicolas on test setup + module design Geneva
- News from Poland
- Discussion on scintillator plan for spectrometer with MPE
- Test beam plans
Minutes 24-02-2020
Attendance:
NCBJ: Dominik, Agnieszka, Slawomir, Adam
Geneva: Xin, Nicolas P., Jerome, Merlin
IHEP: Jianchao
- Some problems again with Vidyo delayed the meeting (fixed by now)
WP0 (Management):
Merlin: In Geneva we received comments on the PEA document, mainly regarding export, should be ok to implement. The main change is that ESA will probably require us have a formal review (by a company) for the export.
Agnieszka: There was a meeting in Poland about POLAR-2. Things seem to be ok, export is also the major issue here. Other issue is that it is the first time for these people to do a PRODEX proposal like this, but this should be ok.
Xin: For export we can try to get all of it done together, probably if ESA says it is ok, it should be ok from a national level as well, this will save time and money. We will check with ESA if this is possible.
Dominik: Was asked for a document for the export restrictions list from Europe, not sure if this list exists but couldn't find it.
Merlin: Will check with our contact at ESA if he can provide such a list.
Merlin: Jianchao pointed out we can apply now for beam time at ESRF, deadline is this week so will prepare the application. Beam line (ID15A) is found which can do 20-500 keV + beam size up to 6x8 mm^2, so quite perfect for us. Beam test would take place between september and February, will check if we can give a preference for a time.
WP1:
- Nicolas is writing report on the wrapping material to be used in POLAR-2. We did at test at CERN with the new material which seems better in some respects than the old one, also it is Japanese so no export issues.
- Last step for module design is the damper thickness which sets the length of the sockets to be designed. If we know the thickness we have everything upward of the SiPM fixed. For damper thickness we might need to wait for input from CSU on the shock and vibration requirements... could take a while.
WP2:
- Jerome developed an LED flashed board which we can use to properly test the SiPMs, working with this now.
- Jerome will check with Yannick regarding the noise of the Citiroc, we have to somehow push for this to be resolved quickly probably without help from Yannick who is too busy.
- Jerome is finalizing the FPGA firmware to use for GOWIN radiation test at DPNC. Tests can probably start sometime next week, he is documenting all the different components and how to test these.
- Nicolas will contact the guys in Bern to organize a test sometime in early April.
WP3:
- Dominik is in contact with the nano-explore people and figuring out if we can use the "medium" size FPGA, the large one is not on the market yet
- Has to see if it is big enough for our purpose
WP4:
- Dominik is still working on the TDR, should all be easier than WP3
- Finding components ok for export should not really be an issue
WP5:
- Merlin is still waiting for any answers from CSU, meeting regarding the size of POLAR-2 is postponed indefinately, in the mean time we shift focus on WP1 to at least get that done
WP8 (POSS):
- Merlin asked CSU to put Nicolas in contact with expert, for now they will send a document (in chinese) on the communication protocol, however, it has been a week since they said they would send that. Merlin will continue pressurising them to send this.
- Nicolas and Dominik discus on the hardware needed for the communication at some point. Maybe we can buy it from China, for sure we cannot write the firmware for the fibre channel ourselves.
- In POLAR we had 1553B and something else between IBOX and the TG-2, 1553B communication parts can be taken out of the firmware.
WP9:
- Jochen is at the scintillator company to discus POLAR-2, he is in the process of ordering the scintillators for the spectrometer
- A student will be sent from MPE to Geneva to start the optical simulations for the spectrometer
- Jianchao will continue discussing with GeCAM people and Dominik on integration of the GeCAM detectors into POLAR-2
- Will have final details ready for the collaboration meeting in May to check feasibility
Presentation from Slawomir (NCBJ) on SiPM irradiation tests (slides on svn in /WP2/SiPM/):
- Tested S13 generation of Hamamatsu (3x3 mm and 6x6 mm, all different pixel sizes)
- Tests with neutrons and protons
- Radiation increases noise, this noise is not the same as the normal p.e. noise, it makes the p.e. peaks very broad and indistinguishable
- Effects are worse for larger pixel sizes
- If operated at very low temperatures it seems there should be no problem with the irraditation of several years in space
- Nicolas mentions we should do simulations to see how far protons get in POLAR-2, Merlin will check with the new post-doc if he can start those
- Nicolas asks about the length of the SiPM signal, the one in the slides is not the one for the S13 SiPMs, they will redo the plots with those to check
- Also Merlin will send them some of the SiPM arrays we have in Geneva to redo at least the neutron tests with to see if the behaviour is the same as for the S13
- Nicolas suggests they come and help at a future test in Bern since they are clearly better at this than we are.
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