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SLHC Optoelectronics Proposal B Meeting, 02 April 2007<o:p></o:p>
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Attendances: Tony Weidberg, KK Gan, Jingbo Ye, Cigdem Issever, Todd Huffman, Theresa Bruemmer, Karl Gill, Pat Skubic, Flera Rizatdinova, Rusty Boyd
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First part of the meeting we discussed the following documents: <o:p></o:p>
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1) CMS Tracker Optical Links, Quality Assurance Manual, Chapter 9.2
2) ATLAS Standard Radiation Test Methods, Appendix 2 of ATLAS Policy on Radiation Tolerant Electronics revision
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The following questions/comments were raised:
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1) Jingbo: Test procedures on dose rate effects are missing in the documents.
Karl: Can’t define these before performing pre-tests, since dose rate effects will be
important in case one sees annealing/anti-annealing
2) Tony: The documents are for the production/assembly phase and we are currently in pre-doction phase.
KK: Actually we are in the market survey phase.
All: Agreed with KK’s statement.
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3) Karl pointed out that the protocols for reliability tests are missing in the ATLAS document and that we need to agree on them.
It was discussed how many devices one would need to irradiate in the market survey phase in order to decide which devices to test in detail. Karl told us that CMS irradiated ca. 5 devices during the market survey phase. KK commented that one should try to irradiate as many devices as possible in this stage.
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3) Karl: Depending on what we see in the first tests we need to include test procedures for time, temperature and bias dependent effects. This is not included in the ATLAS document.
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4) Karl: CMS irradiated during the pre-production phase on the order of 10 to 100 devices to determine TID, T effects, etc.
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During the second part of the meeting we discussed the radiation plans of the group members for 2007:<o:p></o:p>
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1) Karl is planning to perform SEE tests with p-i-n diodes which are in the current CMS detector and also new p-i-n diodes. He does not know yet which new ones he will be testing because he did not survey the market yet. The test will be most likely performed sometime in autumn 2007 and a PSI (60 MeV proton source).
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2) KK intends to repeat the VCSEL and Si p-i-n diode irradiations at the PS this year. This time he wants to irradiate over a three weeks instead of 1 week up to SLHC dose. He intends to irradiate the same set of VCSELs he had irradiated 2006. If there is space at the source he plans to irradiate also new VCSELs. Jingbo asked if KK would irradiate Finesar VCSELs which he had been irradiated in order to confirm his test results. If space is allowing it, KK agreed to do so.
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KK intends also to irradiate Si and GaAs p-i-n diodes.
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3) Jingbo plans to perform irradiations tests with VCSELs fall 2007 at a 200 MeV proton source. These will be SEE tests.
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4) <st1:city w:st="on">Oxford</st1:city> plans to irradiate optical fibres at SCR in <st1:place w:st="on"><st1:country-region w:st="on">Belgium</st1:country-region></st1:place>. Fibres which will be irradiated are GRIN and SIMM fibres. Since the irradiation of SIMM fibres at INER in <st1:place w:st="on"><st1:country-region w:st="on">Taiwan</st1:country-region></st1:place> showed dose rate dependency these irradiation are planned to be with online monitoring. Jingbo will send <st1:city w:st="on">Oxford</st1:city> the part number of the 10 GB fibre he has irradiated and <st1:city w:st="on"><st1:place w:st="on">Oxford</st1:place></st1:city> agreed to irradiate these fibres too. The tests will be in fall 2007.
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Jingbo mentioned that GRIN fibres showed dose rate effects at very high dose rates.
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The SM fibres used in the current CMS detector were tested up to SLHC doses and will perform well according to this test. Karl reported that these tests were not online monitored, but since the performance degradation was very small an online monitored test will be not necessary.
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Tony asked if we should irradiate the 1310 nm SM fibres used by the LHC machine. Karl pointed out that we should first contact LHC and asked them up to which fluence they have tested their fibres. He mentioned that the Frauenhofer institute did intensive tests of these fibres for LHC and that there should be already a lot of information about their performance available. Karl will email Tony the contact person and Tony will find out what test were done on these fibres.
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Third part of the meeting was dedicated to the organization of the work on the SLHC radiation protocol document:<o:p></o:p>
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All:
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1) It was agreed that the group will write a radiation protocol for opto-electronic component tests for the SLHC.
2) It was agreed that the document will be organized according to the devices under test:
a. Lasers
i. EELs (will be written by Karl)
ii. VCSELs (will be written by KK)
b. p-i-n diodes (will be written by KK/Karl)<o:p></o:p>
c. fibres <st1:city w:st="on"><st1:place w:st="on">(will be written by Oxford)</st1:place></st1:city>
d. transceivers/emitters (will be written by Jingbo)
3) It was agreed that a second document will be prepared which will list the different radiation sources including
a. Information about costs,
b. Name of contact person,
c. Picture and description of the target area at the source
d. Fluences and fluxes
e. Beam types
4) After agreeing on both documents the group will present them to the managements of CMS/ATLAS/CERN.
5) We agreed to meet every month to second month depending on the need.
6) Next meeting will be begin of May and date and time needs to be agreed via email. Aim of this meeting is to discuss the sections of the radiation protocol documents written up by (Karl, KK, Jingbo and <st1:city w:st="on"><st1:place w:st="on">Oxford</st1:place></st1:city>).