Future Scintillator HCAL R&D perspectives

1. Future Scintillator HCAL R&D perspectives HCAL Main meeting at DESY September 29, 2005 HCAL Main Meeting

2. Beyond testbeam • The “physics prototype” name is misleading – it is a testbeam calorimeter and not a technical prototype • Technical solutions scalable to a full detector need to be developed • Front end electronics and DAQ • Readout boards • Calibration system • SiPMs are under rapid development HCAL Main Meeting

3. Front end directions • The fast SiPM signal can be exploited for auto-triggering; see e.g. OPERA ROC [NIM A521 (2004), IEEE NSS 03] • Would decouple shaping and latency • Would allow calibration with r/a sources - or even noise • Could extract timing (1ns) • Following the ECAL trail: incorporate the ADC in the front end • G.D.A.S.A.P. • simpler or higher integrated DAQ C. De La Taille HCAL Main Meeting

4. Slab FE FPGA Conf/ Clock Clock+Config+Control VFE ASIC VFE ASIC VFE ASIC VFE ASIC PHY Data Readout boards • The micro-coax cable was a conservative extrapolation of the minical experience • 1st step: replace cables by PCB • 2nd step: integrate the ASICs in the PCB • See – again – the ECAL example • 3rd step: develop full electro-mechanical concept including • Signal readout • Coupling to SiPMs (and tiles) • Calibration system • Cooling JC Brient HCAL Main Meeting

5. Calibration system • The present system has belts and suspenders • Classical LED reference signal (with PIN diode monitoring) • Gain calibration with low light intensity • Saturation monitoring with large light amplitude • Temperature sensors • Testbeam experience will tell how to simplify: • Saturation stable? Less light, fewer fibres! • Gain monitoring sufficient? Drop the PIN diodes! • Auto-trigger? Use alpha source instead of LED! (A. Karakash) • I like the LEDs – I can’t imagine commissioning without… • Use both? HCAL Main Meeting

6. SiPMs • Development driven by bigger markets (PET, night vision) • First tests with Hamamatsu devices reported at LCWS, more details at Beaune conference • Performance similar to MEPHI/PULSAR devices, but better sensitivity to blue light • MEPHI has tested larger area SiPMs • Still somewhat noisy, but a first successful step was made • Large area + blue sensitivity: get rid of the WLS fibre and couple the SiPM directly to the tile edge • Big simplification! • Or thinner tiles? (e/pi, total l, coil size) Renker Dolgoishein HCAL Main Meeting

7. European network for detector R&D • Integrated Infrastructure Initiative within European Union Framework Program 6 • Successfully evaluated, negotiations invited • Starts presumably in 2006 • Funding volume: 7 M€ for 4 years HCAL Main Meeting

8. EUDET Participants Participants: • 25 institutes: from DESY, German U, Poland, France, Spain, Czech, Netherlands, Finland, Israel, UK, Sweden, Switzerland Associated: further institutes from Japan, Russia and UK Coordinating institute DESY I3 Coordinator: Joachim Mnich HCAL Main Meeting

9. EUDET Goals, Activities Goals • establish a European network for detector R&D • improve infrastructure for detector R&D • provide access to broader community • outside EUDET, outside Europe Joint Research Activities (infrastructure for future R&D) • Testbeam: Magnet 1.5 T, 86cm bore, pixel telescope (MAPS) • Tracking: TPC general purpose field cage, Si based endplate, Si tracking facility • Calorimetry: ECAL / HCAL structure improvements, general purpose electronics, forward detector development facilities • Support for common analysis and simulation framework HCAL Main Meeting

10. HCAL plans • Goal: a realistic – i.e. scalable – prototype by 2009 • One sector 1*1*3 m • One column, one row instrumented • e beam only • Open for ideas, suggestions • But: Test beam preparation has absolute priority! HCAL Main Meeting