PWO/APD/CSP Development at Hiroshima U. Hiroshima ALICE-PHOS Group
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Transcript PWO/APD/CSP Development at Hiroshima U. Hiroshima ALICE-PHOS Group
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
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
17 August, 2004
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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
delivery expected in late-September, 2004
50
to
17 August, 2004
boards in production
of them w/o capacitor “C5” mounted
to decouple test input pin from signal lines
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.
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- New Pre-amplifier Layout (Ver.3)
17 August, 2004
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.
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- 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
17 August, 2004
be ready for assembly by late-January, 2005
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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
20 x 20 x 200 mm
ALICE-PHOS
operation point
light yield
17 August, 2004
measured with
Hitachi U3010
spectrophotometer
ALICE-PHOS
operation point
mean decay time
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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
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PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- Expertise on PWO/APD Handling
cooling with Peltier modules
stable
operation down to ~ 0 ºC
better ground handling to reduce noise
successful
17 August, 2004
operation of APD readout system
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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
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PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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]
17 August, 2004
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- 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
17 August, 2004
– 430 V (400 V nominal)
PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- KEK-PS T564 (16-23 June, 2004) 31.3 M total (mixed) triggers;
including 664 K electron triggers
successful operation of APD readout
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PWO/APD/CSP Development at Hiroshima U. - T.Sugitate, K.Shigaki, et al.
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- PWO/APD/CSP/Readout Signals ADC distributions
pre-amplifier output
punch-through hadrons
electrons
shaping amplifier output
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- 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
gas cherenkov
hit required
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electrons in
center cell
selected
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- cf. Kurchatov’s Prototype Performance
Kurchatov 1616 prototype
sE/E
at –25 ºC :
1.3 %/E [GeV] 3.6 %/E [GeV] 1.1 %
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- 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
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- Official Business
applied for ALICE associate collaboration
together
with Tokyo and Tsukuba Universities
approval requested at next ALICE meeting
“official” PHOS participation expected soon
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- 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/
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