Overview of the experiment

1
Overview of the experiment
A. Baldini 11 Jul 03

• Collaboration (about 30 physicists at this
  meeting)
• Budget
• Realistic schedule and general status (few words)
  of each sub-detector (see individual
  presentations)

2
The collaboration
INFN Genova University S. Dussoni, F. Gatti, D.
Pergolesi, R. Valle
INFN Lecce University S. Spagnolo, C. Chiri, P.
Creti, M. Panareo, G. Palama
INFN Pavia University A.de Bari, P. Cattaneo,
G. Cecchet, G. Nardo, M. Rossella
INFN Pisa University A. Baldini, C. Bemporad,
F.Cei, M.Grassi, F. Morsani, D. Nicolo, R.
Pazzi, F. Raffaelli, F. Sergiampietri, G.
Signorelli
INFN Roma I D. Zanello
ICEPP, University of Tokyo Y. Hisamatsu, T.
Iwamoto, T. Mashimo, S. Mihara, T. Mori, H.
Nishiguchi, W. Ootani, K. Ozone, T. Saeki, R.
Sawada, S. Yamada, S. Yamashita
KEK, Tsukuba T. Haruyama, A. Maki, Y. Makida, A.
Yamamoto, K. Yoshimura
Osaka University Y. Kuno
Waseda University T. Doke, J. Kikuchi, S. Suzuki,
K. Terasawa, A. Yamaguchi, T. Yoshimura
PSI, Villigen J. Egger, P. Kettle, M.
Hildebrandt, S. Ritt
Budker Institute, Novosibirsk L.M. Barkov, A.A.
Grebenuk, D.G. Grigoriev, B, Khazin, N.M. Ryskulov
3
Budget (K)
Approved in april
Approved in may
2003-2005
4
Magnet Construction finished!

• Construction was finished!
• Excitation test has started on June 21th.

Compensation coils
Superconducting coil in cryostat
Potentiometer
Support frame
5
COBRA Magnet schedule
Jan 2002
2002
2003
2004
2005
Design
Ass.
Test
Winding Cryo.
Platform
Deliv. PSI
Test
Field Measurement
Jan 2003
Test
Milestone
Assembly
Design
Manufactoring
6
Platform design status (June 24th)
beam
7
Z-Branch Measurements April/May2003
Measurements Phase B post
Triplet 2 Collimator Phase C post
Solenoid Several unexpected problems encountered
Solved !!!
8
Beam
Jan 2002
2002
2003
2004
2005
Studies
Quadrupoles
Solenoid
Target
Jan 2003
Test
Milestone
Assembly
Design
Manufactoring
9
Photon detector

• Large prototype successfully operated with
  purified Xenon at TERAS ?E?2
• LP already shipped to PSI will be better tested
  by making use of monocromatic photons
• Need of a liquid hydrogen target
• Cryostat project is being examined by F.
  Raffaelli (Pisa) who will follow its construction
• PMT test facility under construction at Pisa
• Deficit in the budget for 350 PMTs

10
Photon Detector schedule
2002
2003
2004
2005
Large Prototype
Beam Test
Beam Test
Engineering runs
Vessel Design
Assembly Test
Manufactoring
PMT Delivery Testing
Assembly
Test
Refrigerator
Manufactoring
Assembly
Liq. Purification
Test
Milestone
Assembly
Design
Manufactoring
11
Drift chambers

• Prototypes of cathodes supporting structure
• Print foils meeting the experimental requirements
  found
• Tests at ?M1 drift time measurements and
  cathodes read-out
• First studies on pattern recognition

12
Positron Tracker
Jan 2002
2002
2003
2004
2005
Medium Prototype
Charge division Cosmics
Full Prototype
FP
FP
Full Detector (18 DC)
Test
Milestone
Assembly
Design
Manufactoring
13
Timing Counter
Jan 2002
2002
2003
2004
2005
PMT Evaluation
PMT
Design

• Tests of fine mesh PMTs (even in magnetic fields)
  and of counter prototypes (?M1) going on
• Good solution for transverse detector
  scintillating fibers APDs

Test
Milestone
Assembly
Design
Manufactoring
14
Electronics

• Need of at least two prototypes (both for the
  trigger and the DRS)
• First trigger prototype to be tested in september
• Second DRS design is soon going to be designed

15
Trigger
Jan 2002
2002
2003
2004
2005
Prototype Board
2nd Prototype
Full System
Test
Milestone
Assembly
Design
Manufactoring
16
DRS (DAQ)
Jan 2002
2002
2003
2004
2005
Tests
1st Prototype
2nd Prototype
Boards Chip
Test
Test
Milestone
Assembly
Design
Manufactoring
17
Complete Detector
Jan 2002
2002
2003
2004
2005
Platform
Engineering Runs
Detector Integration

• Start of the experiment in 2006
• All possible engineering runs in 2005

Test
Milestone
Assembly
Design
Manufactoring
18
Sensitivity
We confirm our (July 02) estimates of detectors
resolutions and therefore our goal of improving
the present limit by two orders of magnitudes
The rate is lowered in order to have 0.5
background events for 1 signal event