CALICE MAPS Meeting, RAL, 10/02/10 ================================== Present: Paul Dauncey, Marcel Stanitzki, Jan Strube, Mike Tyndel, Nigel Watson, Gary Zhang Phone: Owen Miller, Tony Price Minutes: Paul Minutes of last meeting: No changes. Matters arising: o Paul had looked up the impact factors for the candidate journals. In 2008, IEEE/TNS was 1.518, NIM was 1.019 and JINST was 0.821. Sensors was not listed. JINST had only just started at this time and since the LHC TDRs were published, their impact factor is probably a lot higher. IEEE has an 8 page limit so is not viable for the TPAC1.0 paper. Having talked with Renato, Paul concluded JINST was the most feasible so the paper draft is now formatted for that journal. o On conferences, Marcel had sent round a request for SPIDER speakers at LCWS10 in Beijing but has had no replies. Jan and Yiming Li are already giving non-SPIDER talks. LCWS10 is during the DESY beam test so it is bad timing. Also coming up are a silicon detector conference in Siena in Jul and the IEEE/NSS in Knoxville in Oct; see web page for links to these conferences. o Paul has brought six TPAC1.0 PCBs back to RAL and left them on Jamie Crooks's desk. o There are been no progress on obtaining watchglasses and this is now probably too late for DESY. Rather than potting, the remaining unpotted sensors should be covered with black plastic lids. The extra material should be negligible in terms of scattering. o Paul checked with Erika and we will be able to borrow some large scintillators when we go to DESY (but see below). Apparently there was some confusion at DESY about this so Jaap should be cc'ed on future emails. o The DESY beam test dates are fixed to be Thu 11 Mar to Thu 1 Apr. In addition to TPAC, there will be programmes for Fortis and LowMass, although the latter will only be a day or so and TPAC is the primary user. CERN beam test analysis: Owen showed some slides on MIP efficiencies; see the usual web page. In all cases, the n-sigma cut includes an extra 25mu in all directions to ensure the centres of the pixels are included. He finds the measured efficiency is now less sensitive to the exact cut. DESY beam test: Tony showed some slides on basic simulation results from the beam test MC; see the usual web page. In all cases, he has no tungsten converter included so this is modelling the tracker. He finds the simulation is fine for muons but with electrons can give random segmentation faults; this implies memory errors. Paul suggested looking for differences between deposits from 120GeV pions (as at CERN) and 6GeV electrons (as at DESY) to see if we expect a systematic difference between the single-particle signal in the two cases. This might change the apparent efficiency if so. Marcel connected up the DAQ system with four USB_DAQs this week and it has been running stably for the last five days with no errors. Paul has started on trim tests to check that the pedestals are stable. He will also do readout speed tests to find the best configuration for the DAQ. Nigel forgot to bring the PMTs today so he will arrange for them to be brought down next week. The system can then be run for cosmics, which will allow a lot of debugging to be done. There is currently one of the three PMTs at RAL but, with all of the control boxes still at Birmingham, this PMT cannot be used. Gary has made cables for the CAEN power supply so this is ready to be tested with the USB_DAQs. Once the system is completed, then it should be run with both sets of power supplies to check there are no significant differences, e.g. in noise rate. Rui Gao has repaired two USB_DAQs and returned them to RAL this week. This afternoon, these should be installed into the system to make the full set of six layers. The stand for the black cloth still needs to be made. Measurements of the required dimensions are required and should be done today. Jaap Velthuis has negotiated that RAL can claim back part of the travel costs for the DESY beam test from the EUDET funds. This does not affect anyone claiming for travel; they should charge to the SPIDER travel budget as usual and at the usual per diem. It would be useful for anyone claiming for more than one trip to specify different aspects of the project for each trip, i.e. LowMass, TPAC or Fortis. The equipment should be driven out so as to arrive at DESY the day before the official start, Wed 10 Mar. This probably means taking an overnight ferry on Tue 9 Mar. We should confirm that a small van can be hired which is allowed out of the UK asap. Any previous radiation training will have lapsed so everyone will need to retake the DESY training to be allowed in the beam area. This should be organised through Jaap. The EUDET interface to the master USB_DAQ is not yet completed. Rui has borrowed a TLU from Bristol but seems to be having problems getting it to run. Paul has asked Dave Cussans to help out. Rui has some of the new firmware done but there is still some implementation to go. This is now getting tight so Paul will continue to chase this up. Nigel has got some information on using the EUDET LCIO output files from Jaap and Alesssandro at Bristol. He does not have any information on how to do the alignment yet. If Alessandro is still employed in March, it might be best if he could do the alignment for all the EUDET telescope data. Nigel will do the production jobs for stripping out the track information which will then be used in the TPAC analysis. There have been very few people sign up on the doodle yet for shift availability. The people who will be available for at least some of the run period are o Imperial: Paul o Birmingham: Nigel, Tony, John? o RAL: Marcel, Jan, Gary, Mike?, Chris? o Bristol: Jaap, Ryan Page (PG student), Dave? o Oxford: Rui This gives between 9 and 13 people. For safety reasons, there must be two people at all times in the shift area. Felix Sefkow has volunteered some of his DESY group to work in the counting room so that we only need to supply one person if we are tight. There is an LCUK meeting at RAL on Tue 16 Mar which Marcel will return for. It is not clear how many other people should return for this. (The discussion was postponed until after lunch and then reconvened.) The monitor program needs to be revived and upgraded. Specifically, some plots to be added are: o Timestamp difference between the sensor hits and PMT hits. There was a clear peak in this variable in the CERN data and this shows the sensors were seeing the beam. o Timestamp difference between the EUDET trigger times and PMT hits. This should confirm the EUDET interface is working at a basic level. o Temperature vs time from the sensor thermal measurements. o Record data sizes and rates. Paul will contact Jan with details of how to access the required data. Nigel looked up the sizes of the EUDET telescope sensors and thinks they are ~7x7mm2 rather than several cm2. This would mean large trigger scintillators for the EUDET telescope would not be useful. If this is the case, it might be best to trigger the telescope from the TPAC 1x1cm2 time-tag scintillators. It is not clear if there is a fanout for the signals on the PMT board and what the TLU would need as a trigger input so Paul will contact John Wilson and Dave Cussans to check on this. The relative alignment of the TPAC and EUDET systems will be much more sensitive too; they probably should be done to within 1mm. One approach would be to move the TPAC stack around to maximise the hit rate seen in the PMTs; this assumes the EUDET telescope is correctly centred on the beam line. In any case, it would clearly be very useful to have an xy stage for the TPAC stack as this would allow motion easily. The total stack weight will be less than 20kg. Paul will contact Erika about this. It is also clear that having access to the EUDET data from the start is very important. Nigel will take all the converter plates for the mechanical structure back to Birmingham today. These will be milled down to allow them to be inserted into the centre of the TPAC stack without withdrawing the support rods. It is likely that this will change the alignment at the level of 100mu but this seems unavoidable. Paul has now trimmed both sensors which were left by Jamie before he went on honeymoon. The second sensor (#50) had both regions 2 and 3 not working so we should not use it unless we are desperate. Paul will suggest to Jamie that a new sensor of the same type is put on. This means the calicedaq2 test system should not be disassembled yet. Papers: Marcel will set up two svn repositories for the two papers currently in draft. Paul will then commit the existing files. Gary has restarted the test pixel Fe55 measurements and with the new source is able to do a good run overnight. He is systematically working through all the required variants. The TPAC1.0 paper requires Fe55 results from Marcel and the test pixel laser scan results from Jamie, but is otherwise close to being ready. It is not clear if the two papers can be submitted at the same time, but if the TPAC1.0 paper is ready first, then it will need to reference something to justify the DECAL concept. There are the LCWS07 conference proceedings by Anne-Marie Magnan and EPS07 from Nigel which might be acceptable for this. Nigel has started getting the software together for the DECAL paper but has not yet got the digitisation code from Anne-Marie. Next meeting: This will be at RAL on Mon 1 Mar, starting at 10am.