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

PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.2 17 August, 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 17 August, 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 17 August, 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 17 August, Pre-amplifier Task and Schedule - early decision of CSP version required  version 2 or 3 on 1 st PHOS module ?  need to complete mass production in JFY04 (ending March, 2005) CSP for 1 st 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 17 August, Past PWO Crystal Property Studies - Furukawa Co. Ltd. in Tokyo, Japan density 8.28 [g/cm 3 ] radiation length 0.89 [cm] Moliere radius 2.2 [cm] peak emission [ns] refractive index x 20 x 200 mm Y-doped PbWO 4 light yieldmean decay time transmittance measured with Hitachi U3010 spectrophotometer ALICE-PHOS operation point ALICE-PHOS operation point

PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.7 17 August, 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 17 August, 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 17 August, 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 August, Past Beam Tests at LNS/REFER - w/ PMT readout   E /E = 2.5 %/  E [GeV]  1.3 %   x = 2.3 mm/  E [GeV] noise problem with APD at room temp. counts [a.u.] E total = 141 MeV σ/E total = 7.3 % = 2.8 % /  E total energy [MeV]

PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al August, 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 August, KEK-PS T564 (16-23 June, 2004) 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 August, PWO/APD/CSP/Readout Signals - ADC distributions punch-through hadrons electrons pre-amplifier output shaping amplifier output

PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al August, Hiroshima’s Prototype Performance -  E /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 gas cherenkov hit required electrons in center cell selected

PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al August, cf. Kurchatov’s Prototype Performance - Kurchatov 16  16 prototype   E /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 August, Summary and Outlook - charge-sensitive preamplifier (CSP) design revised; version 3 in test production CSP for 1 st 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 August, 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 August, 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 