Visit to CALICE ECAL testbeam (by Shinshu) at DESY, 16 th – 19 th October 2012 Samir Arfaoui & Erik van der Kraaij 30 th October 2012
DESY 30th October 2012Erik van der Kraaij, CERN LCD 2 Scintllators: 45x5x2mm strips are used by the japanese they recycled them from a previous prototype tile and had the strips cut from it no clear supplier for their scintillators Read-out: Hammamatsu MPPC (model?) Their layer has 144 tiles (36x4) with 4 HBU and 4 SPIROC2b chips. On top, 3 cards: –DIF (LEMO for Spill signal, TTL signal, and Reset) –Calibration board (LED) –Data-out board with USB connector
DESY 30th October 2012Erik van der Kraaij, CERN LCD 3 Trigger Self-trigger: when one tile has a hit over threshold, all the tiles on the same HBU (36 total) are read out. Validation mode: a crossed scintillator pair in coincidence for external trigger, upstream of the prototype. If validation signal is sent within clock-cycle of self-trigger, data is flagged as validated –Helpful to get rid of noise self-triggers –Japanese team did not manage to operate in this mode Front-end: SPIROC2b Seems to be a black box… Memory: 16 events and 0.5-1s for read-out Complex configuration (Labview programs by DESY people) not a good idea for early CERN lab setup… Need expertise (LAL? DESY?) for initial setup/operation –Japanese team lacked it, slowed them down greatly
DESY 30th October 2012Erik van der Kraaij, CERN LCD 4 Came in this morning from Katsu They managed to perform measurements at various positions in the shower
CERN 30th October 2012Erik van der Kraaij, CERN LCD 5 Need for CERN lab: at least 3 scintillators: 2 for coincidence trigger to get rid of the noise and the one under test collimated radioactive source SiPM + decoupling circuit => Picoscope Hamamatsu MPPCs from DESY (thank you) –10 of them in Samir’s office (+ a couple of reflective foil sheets) Black box with cooling (or at last temperature monitoring) and shielding Readout options (from Christian) EasiRoc. High level of integration channels. ADC, no TDC. Could be made available by Aachen. SPIROC + testboard at OMEGA. Details still to clarify. CAEN VME module (similar to DESY). PreAmp, ADC, TDC. How to bias MPPCs? CERN pool? Picoscope. 4 channels. Bias via Keithley. CERN pool?
More pictures on the strips 30th October 2012Erik van der Kraaij, CERN LCD 6
TeraScale Alliance testbox For single channel 30th October 2012Erik van der Kraaij, CERN LCD 7
Decoupling Multi-channel board 30th October 2012Erik van der Kraaij, CERN LCD 8
Readout by VME Instead of picoscopes 30th October 2012Erik van der Kraaij, CERN LCD 9
Readout by VME … 30th October 2012Erik van der Kraaij, CERN LCD 10