Post on 28-Dec-2015
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 220 July 2004
- Presentation Outline - Recent Activities on PWO/APD at
Hiroshimacontinuing property studies of key
componentsbetter expertise on PWO/APD handling
cooling noise reduction
calorimeter prototype performance evaluation
beam tests at KEK-PS and Hiroshima-REFERreadout electronics design update (Toru)
Summary and Outlook
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 320 July 2004
- 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
20 x 20 x 200 mm
Y-doped PbWO4
light yield mean decay time
transmittancemeasured withHitachi U3010
spectrophotometer
ALICE-PHOSoperation point
ALICE-PHOSoperation point
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 420 July 2004
- 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, Russiaadopted by ALICE-PHOSdetailed investigation ongoing at Hiroshima
further comparison of crystals in progress
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 520 July 2004
- Expertise on PWO/APD Handling - cooling with Peltier modules
stable operation down to ~ 0 ºC better ground handling to reduce
noisesuccessful operation of APD readout
system
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 620 July 2004
- 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 Activities at Hiroshima U. - Kenta Shigaki 720 July 2004
- 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
.]
Etotal = 141 MeV
σ/Etotal = 7.3 % = 2.8 %
/E
total energy [MeV]
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 820 July 2004
- Recent Beam Test at KEK-PS - prototype w/ real ALICE-PHOS components
NC PWO + Hamamatsu APD electron enriched non-separated (IT) beam
negatively chargedelectron/beam ~ 1 % before online enrichment
beam momentum scan0.5 GeV/c – 2.0 GeV/c
APD HV scan380 – 430 V (400 V nominal)
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 920 July 2004
- 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 Activities at Hiroshima U. - Kenta Shigaki 1020 July 2004
- PWO/APD/Readout Signals -ADC distributions
punch-through hadrons
electrons
pre-amp output
shaping amp output
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 1120 July 2004
- Hiroshima’s Prototype Performance - E/E = 5.5 % at 1 GeV/c, 3.1 % at 2
GeV/cwith quick and rough near-line
calibrations including significant beam momentum
spread analysis ongoing to subtract external
contributionsgas cherenkov hit required
electrons in center cell selected
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 1220 July 2004
- cf. Kurchatov’s Prototype Performance - Kurchatov 1616 prototype
E/E at –25 ºC :
1.3 %/E [GeV] 3.6 %/E [GeV] 1.1 %
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 1320 July 2004
- Summary and Outlook - continuing basic property
investigation of key components (PWO/APD/readout)
several prototypes fabricated/tested better local expertise independent prototype performance
evaluation in progress
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 1420 July 2004
- Official Business - applied for ALICE associate
collaborationtogether with Tokyo and Tsukuba
Universitiesapproval requested at next ALICE
meeting“official” PHOS participation expected
soon
PWO/APD Activities at Hiroshima U. - Kenta Shigaki 1520 July 2004
- 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 pagehttp://www.hepl.hiroshima-u.ac.jp/
quark/pwo/