RD-2017-10-30

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Kondo (chair); Alexander, Bob, Craig, Elke, Klaus, Marcus, Martin, Matt, Silvia, Yuxiang

Status of the EIC R&D @ UVa (Kondo)

slides

  • Kondo reports first on the Cr-GEM prototype work. Present design from Rui has narrow (100um) Cu strips with 2cm pitch left on top of the exposed Cr surface. These strips clearly affect gain uniformity (gain can be 2-3 times higher at the area surrounding the strips compared to the bare Cr areas). After long exposure to X-rays the difference almost disappears, but it becomes clearly visible at higher gains (even after long exposure). So there is some charging up effect, which Rui attributes to the fact that Cu removal also increases hole diameter on the bare Cr surfaces.
  • -> Kondo is going to Temple in two weeks from now to inspect the Cr foils on the optical stand;
  • Important note: X-ray intensity is perhaps an order of magnitude higher than the expected EIC rates at forward rapidities, yet there is neither ageing nor damage to the foils observed.
  • UVa received large UV-readout board from CERN, so almost everything is available for the prototype construction (except for the missing $6k for the frames). Should be ready by July FTBF test beam.
  • Marcus asked why Cr-GEM gain is apparently higher at the outer edges of the chamber. Kondo: not sure, can be foil production issues.
  • Silvia: one should observe gain evolution with time in order to come to definitive conclusions. Kondo will look into this.


Progress at FIT (Marcus)

  • Rui finished outer fiberglass frames for the large chamber. Delivery expected this week. Foil to close the volume is missing. Marcus is looking for metallized kapton in order to keep water out. Kondo suggests a company where to get it.
  • One of the FIT students would be willing to come to BNL on March,5-9 to work on Cr-GEM simulations in EicRoot. Alexander confirms that the dates are OK and suggests the student starts familiarizing himself with software in advance, in particular try using EicRoot Docker container, which is in beta state now.


Progress at BNL (Bob)

  • Bob reports on his participation in IEEE conference last week. In particular in his poster he addressed the current state of zigzag development at BNL (small DNL is still observed in the latest prototype; resolution ~100um before and ~70um after the DNL correction). Low dynamic range of APV25 is an issue, which can only be resolved by using better electronics. Working on this.
  • -> Bob is going to present the topics from his poster at the next meeting;
  • Assembly of the new X-ray scanner is completed, but the observed rate is small. One would expect significant increase compared to the old system (40W vs 3W tube and 38 degree vs 120 degree cone, using the same collimator), but rates are barely comparable. It looks like there is a cut-off in the low energy part of the primary X-ray spectrum due to the tube glass window, this reduces XRF secondary emission. Craig mentions that the setup is rather inefficient by nature (one obtains ~100Hz counting rates from the ~40mA beam).
  • -> Bob will look into the possibility to acquire a focussing X-ray gun from XOS, which is supposed to have as small as ~50x50um^2 beam spot; if this option works, the Oxford X-ray source will be exclusively used for IBF studies;


Progress at INFN Trieste (Silvia)

  • Two days ago the final signature on the BNL-INFN contract was signed, so that Trieste group can eventually start spending the FY17 EIC R&D money.
  • In the first week of December the group leader of the team working on nano-diamond photocathodes is going to visit Trieste. One of the goals of the meeting will be discussing the possible ways of practical application of their R&D in the physics detector prototyping.


Progress at Temple (Matt)

  • The DAQ system setup (based on the STAR FGT electronics) is back online after the network re-arrangements. One of the FGT segments sent to Saclay for testing.


Test beam campaign next year

  • Kondo suggested July,4-20 as the potential dates for UVa & FIT prototype tests at FTBF. Alexander asked why not February-March as it was anticipated before. Kondo replied that 1) there are not many free slots for primary beam usage left in FTBF schedule, 2) the detectors can hardly be ready earlier. Craig mentioned that sPHENIX has FTBF test beam Feb,21-Mar,28 and TPC prototype can possibly be tested during this time slot as well (better towards the end of the 5-week period, because any material in front of the EmCal prototype is unwanted during energy resolution studies to be performed in the first two weeks). Marcus suggests that we may want to perform installation in the MT6.2 even a week earlier.
  • Marcus, Bob and Craig discussed the possibility to use BNL GEM cosmic test stand telescope at FTBF in July. This would likely require separation of scaffolding in two pieces and re-alignment in-situ. Marcus points out that it would be very beneficial if online reconstruction software is operational during data taking. Craig mentions that SRS electronics is still missing for this telescope, but will be acquired hopefully in November. Craig says he will not be able to come to Fermilab in July. Bob and Alexander say they most likely could come. Craig mentions that the necessity for TPC tests in July will depend on the overall work progress with the TPC prototype.
  • Alexander mentions the intention of Saclay collaborators to come to Fermilab in February-March and further negotiations about test beam at CERN in June. He also says that Stephan Aune has just returned back from Elvia with very encouraging results concerning laser etching (20um strip-to-strip gaps are technologically feasible and the resulting strip layout looks very crisp). Alexander also mentions that depending on the progress with Elvia and US manufacturers we may have as many as two working zigzag GEM and micromegas prototypes by March 2018, ready for beam tests. In this case makes no sense to postpone the first measurements. Exact planning will depend on the progress made during the next few weeks.
  • Marcus points out early May time slot is also free in FTBF schedule. Marcus and Kondo argue that we need perhaps 2 (3?) weeks of beam time. Martin mentions that alignment and incorporation of test beam wire chambers always requires 1-2 days. The conversation about BNL telescope usage at FTBF goes into its second round. Everybody agrees that the device would help, but as Craig points out the telescope is primarily used as a stationary device at the lab and its usage (and the necessity to disassemble it in two halves in order to be useful in MT6.1) may be problematic. After almost two hours the meeting adjourns.