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PWO/APD/CSP Development at Hiroshima U.

PWO/APD/CSP Development at Hiroshima U. Hiroshima ALICE-PHOS Group (T.Sugitate, K.Shigaki, et al. ) 17 August, 2004, at CERN. - Presentation Outline -. Recent Activities on PWO/APD/CSP at Hiroshima University readout electronics status update CSP design version 3

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PWO/APD/CSP Development at Hiroshima U.

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  1. PWO/APD/CSP Developmentat Hiroshima U. Hiroshima ALICE-PHOS Group (T.Sugitate, K.Shigaki, et al.) 17 August, 2004, at CERN

  2. - Presentation Outline - • Recent Activities on PWO/APD/CSP at Hiroshima University • readout electronics status update • CSP design version 3 • continuing property studies of key components • better expertise on PWO/APD handling • calorimeter prototype performance evaluation • beam tests at KEK-PS and Hiroshima-REFER • Summary and Outlook • Official Business PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  3. - Pre-amplifier Design Revised (Ver.3) - • slightly modified layout (see next slide) • no circuit change from version 2 • proposed and discussed in July, 2004 • version 3 status and plan • 100 boards in production • delivery expected in late-September, 2004 • 50 of them w/o capacitor “C5” mounted • to decouple test input pin from signal lines • to be sent to Iouri at CERN for evaluation • shipping planned in October, 2004 PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  4. - New Pre-amplifier Layout (Ver.3) - • version 3 mask (black) overlaid on version 2 photo (green) • components moved (from yellow to red) to make space around APD soldering holes PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  5. - Pre-amplifier Task and Schedule - • early decision of CSP version required • version 2 or 3 on 1st PHOS module ? • need to complete mass production in JFY04 (ending March, 2005) • CSP for 1st PHOS module coming soon • to be ready for assembly by late-January, 2005 PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  6. - Past PWO Crystal Property Studies - • Furukawa Co. Ltd. in Tokyo, Japan density 8.28 [g/cm3] radiation length 0.89 [cm] Moliere radius 2.2 [cm] peak emission 420-440 [ns] refractive index 2.3 Y-doped PbWO4 transmittance measured with Hitachi U3010 spectrophotometer 20 x 20 x 200 mm ALICE-PHOS operation point ALICE-PHOS operation point light yield mean decay time PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  7. - Recent PWO Crystal Property Studies - • RI&NC Co. in Minsk, Belarus • adopted by CMS • investigated; similar properties as Furukawa’s • ref. graduation thesis by K.Yokoyama (available only in Japanese) • North Crystal Co. in Apatity, Russia • adopted by ALICE-PHOS • detailed investigation ongoing at Hiroshima • further comparison of crystals in progress PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  8. - Expertise on PWO/APD Handling - • cooling with Peltier modules • stable operation down to ~ 0 ºC • better ground handling to reduce noise • successful operation of APD readout system PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  9. - Prototype Performance Evaluation - • prototype components • PWO crystals: Furukawa (Japan) / RI&NC (Belarus) / North Crystal (Russia) • PMT: Hamamatsu R1450 • APD: Hamamatsu S8664 • pre-amplifier: Hiroshima ver.1/2 • cooling: Peltier modules • tests in Japan • Tohoku-LNS (2002); photons at 0.8 – 1.2 GeV • Hiroshima-REFER (2003/04); electrons at 150 MeV • KEK-PS (2004); electrons at 0.5 – 2 GeV PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  10. - Past Beam Tests at LNS/REFER - • w/ PMT readout • sE/E = 2.5 %/E [GeV]  1.3 % • sx = 2.3 mm/E [GeV] • noise problem with APD at room temp. counts [a.u.] Etotal = 141 MeV σ/Etotal= 7.3 % = 2.8 % /E total energy [MeV] PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  11. - Recent Beam Test at KEK-PS - • prototype w/ real ALICE-PHOS components • NC PWO + Hamamatsu APD • electron enriched non-separated (IT) beam • negatively charged • electron/beam ~ 1 % before online enrichment • beam momentum scan • 0.5 GeV/c – 2.0 GeV/c • APD HV scan • 380 – 430 V (400 V nominal) PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  12. - KEK-PS T564 (16-23 June, 2004) - • 31.3 M total (mixed) triggers; including 664 K electron triggers • successful operation of APD readout PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  13. - PWO/APD/CSP/Readout Signals - ADC distributions pre-amplifieroutput punch-through hadrons electrons shaping amplifier output PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  14. - Hiroshima’s Prototype Performance - • sE/E = 5.5 % at 1 GeV/c, 3.1 % at 2 GeV/c • with quick and rough near-line calibrations • including significant beam momentum spread • analysis ongoing to subtract external contributions electrons in center cell selected gas cherenkov hit required PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  15. - cf.Kurchatov’s Prototype Performance - • Kurchatov 1616 prototype • sE/E at –25 ºC : 1.3 %/E [GeV]  3.6 %/E [GeV]  1.1 % PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  16. - Summary and Outlook - • charge-sensitive preamplifier (CSP) design revised; version 3 in test production • CSP for 1st PHOS module by January, 2005 • continuing basic property investigation of PHOS key components (PWO/APD/readout) • several prototypes fabricated/tested • better local expertise • independent PHOS prototype performance evaluation in progress PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  17. - Official Business - • applied for ALICE associate collaboration • together with Tokyo and Tsukuba Universities • approval requested at next ALICE meeting • “official” PHOS participation expected soon PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

  18. - PHOS Collaboration at Hiroshima U. - • 3 staffs, ~10 graduate students • H.Harada, K.Haruna, K.Hirashita, K.Homma, K.Hosokawa, R.Kohara, Y.Nakamiya, M.Ouchida, H.Sakata, K.Shigaki, T.Sugitate, D.Toyoda, Y.Tsuchimoto, K.Yokoyama • Hiroshima PHOS web page • http://www.hepl.hiroshima-u.ac.jp/quark/pwo/ PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.

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