1 / 18

MaPMT Readout Workshop - Agenda, Goals, and Plans

This workshop focused on the MaPMT project, including discussions on readout schemes, integration issues, and electronics. The schedule and goals for the project were also discussed.

jkieffer
Download Presentation

MaPMT Readout Workshop - Agenda, Goals, and Plans

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MaPMT Readout Workshop / Introduction MaPMT Workshop Imperial College 26/27 June 2003 Franz Muheim University of Edinburgh

  2. Workshop Agenda & Goals • Outline of MaPMT project • Reports/Presentations • MaPMT/Beetle studies • Photo detector integration issues • Possible Readout schemes • Level-1 Electronics, PINT results • Plans for this summer • Define MaPMT read-out project • Produce list of tasks necessary to get job done • Identify conflicting requirements • Prioritise different options (if possible) • Planning of schedules and milestones • MaPMT plans and schedule • Hope for lots of fruitful discussions F. Muheim

  3. MaPMTs for LHCb RICH • Multianode Photo Multiplier Tubes • Single photo tubecontaining 8x8 array of 64 dynode chains 2.1 mm pixel size, 0.2 mm gap • Bialkali photo cathode, UV glass window QE = 22 % at  = 380 nm • Lenses • with one flat and one curvedsurface • Increases active area fraction to 85% • effective pixel size 3.0 mm • Readout Electronics • ASIC preamplifier chip with pipeline • Readout architecture L0 & L1 • Mechanics • Photo detector mounts & motherboard • Magnetic field shielding, mu-metal F. Muheim

  4. MaPMT/Beetle Project • MaPMT R7600-03-M64 with 8 dynode stages • gain: 50000 HV 800 V • Front-End electronics • Beetle1.2chip • single photon equivalent 60 mV (2 mip) • signal / noise ratio 40 • analogue or binary readout mode • MaPMT R7600-03-M64 with 12 dynode stages • gain: 300’000 HV 800 V • Beetle1.2-MaPMTchip with gain adaption • single photon equivalent 30 mV (2 mip) • signal / noise ratio 40 • analogue or binary readout mode F. Muheim

  5. MaPMT Plans & Schedule • Read out the8 dynode stage MaPMT • with Beetle1.2 in analogue and binary mode • using the Heidelberg board restricted to 12 channelsJan - June 03 • Read out the12 dynode stage MaPMT • with Beetle1.2MA0 in analogue and binary mode • using the Heidelberg board, restricted to 12 channelsApril - June 03 • Read out all 64 channelsof one or more MaPMTs • with the Beetle1.2/Beetle-MA0 in analogue and binary mode • with Beetle PCBoard July 03 - • Testbeam • Prepare and operate a cluster of MaPMTs in a testbeam, read out with the Beetle1.2 or Beetle-MA0chipMay - Sep 03 F. Muheim

  6. Electronic Cost Comparison • Main Inputs • 232 modules with 16 MaPMTs, 8 Beetle chips, 1024 channels • 220 SFr/optical link, 190 SFr/ 4 copper links 5kSFr/ L1 board • Binary Electronics • 232 optical links, 30 L1 boards1250 kSFr • Analogue Electronics • 4x1856 copper links, 116 L1 boards2100 kSFr • TDR cost for comparison 1600 kSFr • difference to binary850 kSFr • Digital Electronics • 1856 optical links, 78 L1 boards1970 kSFr • difference to binary 720 kSFr • Cost differences are understood • data links costs are rather robust O(50 kSFr) • optimisation for L1 board necessary O(100 kSFr) • absolute cost of L0 electronics needs to be reassessed F. Muheim

  7. Major Issues • MaPMT/Beetle studies • BoardBeetle July 03 • Testbeam 13 Aug - 9 Sep • MaPMT type decision • 8 vs 12 dynode stages Sep 03 • Binary vs analogue/digital readout • cost versus risks (common mode, comparator) • only decision possible now is analogue or digital • proposal - analogue or digital as baselineJune 03 • Design of L0 motherboard • includes cooling, on critical path Jan 04 • report from meeting at CERN 22.5.03 • Software • Performance studies, robustness Sep 03 F. Muheim

  8. Overall Schedule • 1 year old, • produced for June 2002 review, need to update • July 2002 Resume design of Beetle chip done • Oct 2002 Resume Motherboard design starting now • 1 Mar 2003 Choose MaPMTs • Mar 2003 Start tendering not started • 1 Oct 2003 Place MaPMT Order • Jan 2004 L0 F/E Electronics and Motherboard (MB) design completed • Mar 2004 Start Photodetector testing • July 2004 10% of MaPMTs delivered • Jan 2005 L0 - F/E Electronics and MB R&D completed • Mar 2006 100% of MaPMTs delivered and tested • Mar 2006 100% production and testing of L0 and L1 units • June 2006 100% of photodetector modules assembled F. Muheim

  9. Status of MaPMT Project • Large efforthas started for MaPMT projectin 2003 • Measurements of 8-dynode stage MaPMTs signal shape with Beetle1.2 has highest priority • Measurements with Beetle1.2MA0 are promising • More effort is needed • Need to catch up delays, 7 monthsfor L0 Motherboard • MaPMT is baseline • More effortavailable • Need to re-think organisation of MaPMT projectnow • Many importantdecisions need to be taken soon F. Muheim

  10. Backup Slides F. Muheim

  11. Multianode Photo Multiplier • Single photo tubecontaining 8x8 array of 64 dynode chains 2.1 mm pixel size, 0.2 mm gap • Gain: 3.105 at 800 V • Bialkali photo cathode, QE = 22 % at  = 380 nm • UV glass window, was borosilicate, QE dE increased by 50 % MaPMT QE [%] Wavelength [nm] F. Muheim

  12. no lens lens 0 mrad lens lens 400 mrad Quartz Lenses • MAPMT active area fraction: 38% (includes pixel gap) • Increase with quartz lens with one flat and one curved surface to 85% • effective pixel size 3.0 mm Demagnification (f -d)/f  2/3 F. Muheim

  13. 3x3 MaPMT Cluster Test • Measurements with • MaPMT: HV = -1000V • Data • subtract cross-talk and common-mode • Fit # of photo electrons per event:  Single channel spectrum • Cherenkov ring, 6000 events • Observe in data backgroundnpe= 6.96  0.33 0.26 p.e. • Expect from simulationnpe= 6.49  0.17 F. Muheim

  14. Electronics Costs • Major cost differences in • data links • L1 boards • L0 Electronics • 232 modules • 16 MaPMTs, 1024 channels, 8 Beetle chips • 4 data links per beetle, 128: 4 multiplexing, 40 MHz clock • cost very similar for all options • Binary Electronics • optical links to L1 board • 32 : 1 multiplexing (1bit per data link) • 232 optical links, 1 per module (was 2) • costs from John Bibby • cost per optical link220 SFr, total 50 kSFr • 30 L1 boards, 5 kSFr/board, total 150 kSFr • L1 costs reduced by 300 kSFr wrt to TDR F. Muheim

  15. Analogue/Digital Electronics • Analogue Electronics • similar to VELO, with copper links over 60 m • link costs include driver, differential link receiver and ADC (costs from Thomas Ruf) • 4 x 1856 links, 190 SFr / 4 links, total data links350 kSFr • L1 board input: 64 links = 16 cables • 116 L1 boards, 5 kSFr/board, total L1 boards 580 kSFr • Analogue/Digital Electronics • similar to Inner Tracker, ADC at outer detector rim • need rad tolerant ADC (15kRad), • costs from Achim Vollhardt • 4:1 multiplexing with 8bit ADC • 1856 optical links, 252 SFr/link, total data links 470 kSFr • L1 board, input 96 optical links = 6 ribbons • 78 L1 boards, 5 kSFr/board, total L1 boards 390 kSFr F. Muheim

  16. Comparator Review • Phone Meeting of Beetle Users • 30 April 03 • comparing of notes • digital switching noise, 80 MHz, on analogue lines • Comparator Discussion • closed loop of understanding • small differences resolved • conclusions remain the same • 3bits are marginal, • 5bits has comfortable margin • Comparator in Beetle1.2 • 3 bits, no access to negative offsets • Comparator in Beetle1.3 • 5 bits, different sign for Offset and Delta IDAC • will be submitted in June F. Muheim

  17. Allocation of Personnel • Agreed at RICH group leader’s meeting CERN, 26 Feb 03 • Immediatepersonnelrequirements • Setup of read-out and testing A) and B) Edinburgh • Testing of BeetleMA0 B) Oxford • Production of PCBoard for C) Imperial College • Consulting for A) B) SW,JB,NS,DP • Procurement strategy ok • Design of L0 motherboardCambridge, Oxford Genova • CoordinationFM • Additional personnel required in May • Cooling strategy Genova • Higher channel occupancyCERN, Edinburgh • Bleeder board for test beam Cambridge • jigsUK/CERN • moulded lensesGenova F. Muheim

  18. To Do List (on 28 April) • Read-out of 8-dynode MaPMT with Beetle1.2 • (re-)connect MaPMT done • measure analogue spectra with LED done • take data in binary mode July • Review of electronics cost • binary vs analogue vs digital read-out done • Comparator review done • Decision on binary vs analogue • cost versus risks (common mode) ??? • Read-out of 12-dynode MaPMT with Beetle1.2 • testing of Beetle1.2MA0 done • measure with LED analogue spectradone • take data in binary mode July F. Muheim

More Related