PWO/APD Activitiesat Hiroshima U.

Kenta Shigaki(Hiroshima University)20 July 2004 at CERN

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/