status report for kek-ps e391a
DESCRIPTION
Status Report for KEK-PS E391a. KEK IPNS G.Y.Lim 14 April 2003. Measurement of BR( K L p 0 nn ). Collaboration High Energy Accelerator Research Organization, KEK Faculty of Science and Engineering, Saga University Department of Physics, Yamagata University - PowerPoint PPT PresentationTRANSCRIPT
Status Report for KEK-PS E391a
KEK IPNS
G.Y.Lim
14 April 2003
E391a experiment
Measurement of BR( KL ) Collaboration
High Energy Accelerator Research Organization, KEK
Faculty of Science and Engineering, Saga University
Department of Physics, Yamagata University
Department of Physics, Osaka University
Research Center for Nuclear Physics, Osaka University
National Defense Academy of Japan
Joint Institute for Nuclear Research (Dubna) Russia
Department of Physics, University of Chicago, USA
Fermi National Accelerator Laboratory, USA
Department of Physics, Pusan National University, KOREA
New KEK member
Department of Physics, Kyoto University
Data taking from Feb. 2004 Engineering run Preparation of detector components
Two-step program (KEK-PSJPARC)
From the E391aEstablish measurement principleSearch for near SM expectation
E391a Detector
Upstream section
Downstream section
Middle Section
Engineering Run on last winter
Engineering Run
Fabricate on last summer
KL decay data – same format of real run
Develop on-line/off-line software
DAQ using self-trigger of CsI
Same scheme of real run
Tuning / feed-back CsI calibration
Cosmic test in vacuum chamberCosmic test during stackingPunch-through muon Two gammas from single 0
Multi-gamma decay (Kpi2, Kpi3)
Significant step to the successful experiment
DAQ with low noise level
Distributed and parallel processing LeCroy 1885N FASTBUS ADC TKO HR-TDC Operation with tiny noise
1mV threshold for TDC ( 1 MeV) 50 fC ADC pedestal (0.1 MeV)
Calibration using cosmic/punch-through muon
Using cosmic rays
pQpQ/cm
Using punch-through muons
CsI IDCsI ID
MeV
/pQ
Good agreement between two gain factors !
Calibration using 0-production
n
Before correctionBefore correction After correctionAfter correction
Reconstructed
position(cm)
Incident position (cm)
Incident position (cm)
Two invariant mass (MeV/c2 )
Two invariant mass (MeV/c2 )
m : 5.4 MeV/c 3.7 MeV/c
22
Study using Kpi3 decay
Calibration method in real run
How to get correct energy scale
Background free without veto system
Comparison with M.C.
Detailed study is going on
Radial hit distribution of gamma Vertex along the beam direction
- Good agreement
Short spill beam (1X1012 ppp/ 200 ms) Single counting rates (10 mV Thres.)
Response at the high Intensity
PMT gain (Xe monitoring system)
KTeV CsI
0
2
4
6
8
10
12
14
1 2 3 4 5 6 7 8
CC03
0
10
20
30
40
50
60
70
1 2 3 4 5 6
KTeV CsI
CC03
Cou
nts
/ SE
C
Inner CsI
0
1
2
3
4
5
6
7
8
9
1 2 3 4 5 6 7 8
Outer CsI
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1 2 3 4 5 6 7 8
Outer CsI
Inner CsI
7.0 X 1011 / 2s
1.4 X 1012 /2s
1.0 X 1012 / 0.2sADC channels
Xe signal of the 1st CsI module
Nor
mal
ize
cou
nts
On spillOff spill
Peak=1437/Mean=1.6%
Ratio of on/off spill for Xe-peak1.05
1.0
0.95
CsI ID
Same performance under the high beam
Same performance under the high beam
intensity
intensity
Detector fabrication – Upstream
Modules/vacuum chamber doneCosmic test is going on
No.
of
p.e.
/ M
eV
Distance from the PMT (cm)
Assembling on June -July
Assembling jigs are being fabricated
- KEK machine shop
Detector fabrication – Middle
Fabrication of 3 modules ー Finished
1 module/1 week End of Oct. (32 modules)
Design of assembling jigs – final stage
Assembling Nov. – Dec.
Vacuum Chamber : Start bidding process
arrive at the end of Oct.
Schedule
2001 2002 2003 2004
Data Taking
Assembling Detector setup
Vacuum &
Cosmic Test Assembling
Front barrel Construction
Main barrelConstruction
Cosmic Run
Beam survey Engineering Run
Jan. Apr. Jul. Oct. Jan. Apr. Jul. Oct. Jan. Apr. Jul. Oct. Jan. Apr. Jul. Oct.
CsI
Cosmic Run
AssemblingUpstream section
Front barrel Design
Central barrel Design
Up-dated on April, 2003
Evacuating Test
Summary
E391a is aiming for measuring the BR( KL ) Realizing Step-by-step
Engineering run Stable data taking using same triggering scheme of real run CsI calibration – cosmic ray data is very nice input No problem at high beam intensity Good agreement with M.C. Detailed study is going on
E391a is preparing almost on schedule Downstream section is polishing stage Upstream/middle section – being fabricated smoothly Prompt start at the real run (Feb. – June, 2004)Prompt start at the real run (Feb. – June, 2004)
- Full beam acceptable- Full beam acceptable