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30 th October 2012

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. Setup @ DESY. Scintllators :  45x5x2mm strips are used by the japanese

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30 th October 2012

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  1. Visit to CALICE ECAL testbeam (by Shinshu) at DESY, 16th – 19th October 2012Samir Arfaoui &Erik van der Kraaij 30th October 2012

  2. Setup @ DESY 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 Erik van der Kraaij, CERN LCD

  3. Setup @ DESY 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 Erik van der Kraaij, CERN LCD

  4. Setup @ DESY Came in this morning from Katsu • They managed to perform measurements at various positions in the shower Erik van der Kraaij, CERN LCD

  5. Setup @ CERN 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. 128+ channels. ADC, no TDC. Could be made available by Aachen. • SPIROC + testboard at OMEGA. Details still to clarify. • CAEN VME module (similar to Erika @ DESY). PreAmp, ADC, TDC. How to bias MPPCs? CERN pool? • Picoscope. 4 channels. Bias via Keithley. CERN pool? Erik van der Kraaij, CERN LCD

  6. More pictures on the strips Erik van der Kraaij, CERN LCD

  7. TeraScale Alliance testbox • For single channel Erik van der Kraaij, CERN LCD

  8. Decoupling • Multi-channel board Erik van der Kraaij, CERN LCD

  9. Readout by VME • Instead of picoscopes Erik van der Kraaij, CERN LCD

  10. Readout by VME • … Erik van der Kraaij, CERN LCD

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