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EMR Status

EMR Status. Jean-Sebastien Graulich, Geneva. Intro Construction Magnetic shielding Electronics Prototype Cosmics test Schedule. EMR: Electron Muon Ranger. This report is about a team work Como/Trieste: Michela Prest, Erik Vallazza , Daniela Lietti, Davide Bolognini

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EMR Status

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  1. EMR Status Jean-Sebastien Graulich, Geneva • Intro • Construction • Magnetic shielding • Electronics • Prototype Cosmics test • Schedule

  2. EMR: Electron Muon Ranger • This report is about a team work • Como/Trieste: • Michela Prest, Erik Vallazza, Daniela Lietti, Davide Bolognini • University of Geneva: • Franck Cadoux, Florian Maschiotti, Laurent Nicola, CoralieHusi • Pierre Bene, Stephane Debieux • Havard Wisting, Kaspar Rothenfusser • GhislainGrégoire • A lot happened, trying to summarize • Refer to previous presentations for more details • EMR talk at CM25 • EMR Construction Status at VC128 http://mice.iit.edu/vc/vc128/vc128_cadoux_emrstatus.ppt • EMR Cosmic Tests at VC129 http://mice.iit.edu/vc/vc129/vc129_graulich_emrcosmics.ppt • EMR Installation talk at CM2 http://cm26.ucr.edu/wp-content/uploads/presentations/MICE_EMRMar10.pdf

  3. http://indico.cern.ch/getFile.py/access?contribId=28&sessionId=3&resId=0&materialId=slides&confId=69027http://indico.cern.ch/getFile.py/access?contribId=28&sessionId=3&resId=0&materialId=slides&confId=69027 Daniela Lietti CM25

  4. Construction • Main Steps • Cutting to length – done • Gluing fibers (up to 20 per day) • Layer Assembly • Module Assembly

  5. Integration • Extremely compact assembly Outer Box • Difficult access to PMT and electronics after Assembly • Just enough room for local shielding • Heating of electronics (FPGA, HV dividers, etc Flex connector The PMT is attached to the board FEB Shielding not shown

  6. Magnetic Shielding Issue • Situation looked difficult • Impossible to shield locally EMR thickness Plot Field vs PMT location 3D model from Ghislain (OPERA 3D)

  7. Magnetic Shielding Solution • First: Global shield • 50 mm thick iron plate • EMR is moved back (reduce acceptance) • Second: Local shield on PMT EMR PMT axis

  8. Slide 8

  9. Magnetic Shielding Summary • The problem was more serious than originally thought • We have now a satisfactory design • Large iron reflector between KL and EMR • EMR is moved back by 50 mm • Local shielding (1m) around each PMT • We had to stop detector production • 2 months delay • The PMT-Fiber coupling had to be modified • We are ready to resume production

  10. Electronics • Each bar is read out on both side but with independent chains • Digital readout • Each bar is connected to one pixel of a 64 channels MultiAnode PMT • The PMT is connected to a Front End Board (FEB) where the signal is amplified and discriminated • The logic signal from the FEB is sampled by a Digitizer and Buffer Card (DBC) • The DBC stores the data for the entire duration of the spill • The DBC is read out through a VME Controller card at the end of the spill • Analog readout • On the other side • All the fibers from each are bunched together and coupled to a single 1” PMT • The output of the PMT is connected to one channel of a 500 MHz sampling ADC (CAEN V1731) • The data is buffered in the ADC and readout at the end of the spill

  11. Electronics Status • FEB • Designed and produced by Trieste/Como • Based on existing FEB for another experiment (ASACUSA@CERN AD) • Recently modified and tested to use the MAROC amplifier/discriminator chip (instead of Gamma Medica/Ideas VA64TAP) • Digitizer and Buffer Card • Design in progress in Geneva • VME Controller • Based on general purpose VME board provided by Trieste/Como • Clock and Trigger distribution • Under discussion • Sampling ADCs • In hand in Geneva

  12. Cosmics Test • One full module (2 layers) operational in Geneva • DAQ provided by Como/Trieste • Many Thanks to Daniela Lietti and Davide Bolognini 2 EMR Layers Trigger Scintillator 10x10 cm2 2 X-Y Silicon stripdetectors 10x10 cm2

  13. The first EMR Module Multi-anode PMTcoupled to FEB FEB X Y Single anode PMT All fibers bunched

  14. Analysis – Prerequisite • Using the prototype Front-End Board based on the VA64TAP chip • Need to scan the sampling time to determine our working point

  15. Efficiency • Testing different configurations • High Voltage scan • With/Without Optical grease • Standard/Green enhanced PMT • Two independent analysis • Trieste/Como : Michela Prest and Davide Bolognini • Geneva: Havard Wisting Green Enhanced PMT Efficiency ~98 % Standard PMT Efficiency ~93 %

  16. Cross talk • Obvious cross talk between channels • Between anodes • Partially due to the PMT alignment • Not only ! • Between fibers ? • Can improve fiber isolation…

  17. Cosmics test Summary • Currently taking data at about 3 Hz • Efficiency Measurement consistent with First prototype results: ~97.5 % • Cross talk is a serious issue • Next Steps • Integrate the single PMT readout in the DAQ • Need to migrate from SBS Bit3 to CAEN VME-PCi interface first • Test with the first production module • 1.2 mm fibers • More precise PMT lodging • Define automatic test procedure for QA during production

  18. Project Plan • Running full speed, we need 6 working days to produce 1 module (2 layers) => Production time: 7 months • EMR production should end in October 2010 • Digitalization and Buffer card design test and production • Estimated to 6 months • We are considering a partial delivery to RAL this summer in order to have an early test of integration in the DAQ • We also depend on other experiment pressure on our Engineer/Technician staff

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