General Status of the Barrel Muon Alignment Project
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
General Status of the Barrel Muon General Status of the Barrel Muon Alignment ProjectAlignment Project
The work is supported by The Hungarian Scientific Research Fund OTKA T 026178, T034910, T 043145
The Barrel muon Alignment Collaboration:
Institute of Nuclear Research, ATOMKI, Debrecen, Hungary
European Laboratory for Particle Physics CERN,
Geneva, Switzerland
Institute of Experimental Physics of Debrecen University,Debrecen, Hungary
Institute for High Energy Physics,
Vienna, Austria
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
IntroductionIntroduction
For those who are less familiar with the project:
Passive plane (12)
Active plane (12)
Muon chamberoptical line(8 lines)
Link line
MAB (36 pieces)
Z bar
Diagonal connection
- Rigid structures (MABs, z-bars)- Video-camera boxes (on the MABs)- LED holders (called forks, on the chambers)- Diagonal and Z LED holders
(on the MABs and z-bars)- Board computers (one for each MAB)
Elements of the system:
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Rigid structures (MAB, Z-bar)Rigid structures (MAB, Z-bar)
The manufacturer is the IMMG consortium in collaboration with HELCO (Greece).
After the test of the first MAB (prototype) 6 units are to be produced by September 2003 and the rest by March 2004.
MAB:
The tender procedure for the production of the MABs is finished.
Z-bar:
The design started (H. Gerwig). It is much-much simpler than the MABs.
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Video-camera box partsVideo-camera box parts
Under construction. It checks the•Functionality, •Sensitivity of the pixels (average, sigma),•Pixels with significant deviation.
Sensor + driver:
Lens-part:
Lenses are ordered:Chamber and z: f=30mm, diam.=10mm, 600 piecesDiagonal: f=70mm, diam.=12mm, 150 pieces.Total cost: ~22 kCHF.
Mechanics (holder) for both:
Design to be finalized together with Hubert. Working…. Fabrication is organized (HEPHY, Vienna).
22 m
m
The assembly of the full quantity (~750 pieces) is ready (Debrecen, Budapest).
Sensor quality control facility (Debrecen):
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
LED holdersLED holders
Fork production:
Finished (already last year).
Fork calibration (8 Apr 2003):
200 (out of 1050) are calibrated.
(See separate talk about the details)
Fork delivery schedule:
- 120 forks are already at CERN- Next 80 by 15 May 2003- Next 300 by 15 September 2003- Last 450 by 15 March 2004
Other LED holders (diagonal, z): under design (H. Gerwig).
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Fork installation and chamber calibrationFork installation and chamber calibration
The chamber calibration bench is operational and performs well.
About the details of the first experience see separate talk.
The main problems:- handling of the feet- cabling
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer statusBoard computer status
Passed a very important milestone:irradiation test (see next slides).
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
The Svedberg Laboratory (TSL),Uppsala University, Uppsala (Sweden)
11-12 February 2003
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
Experimental setup:
Proton beam
Scintillators forrate measurement
PC-104
video-camera
ethernet
Particle: proton+Beam energy: 95 MeVBeam size at the board computer: about Ø10 cm
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
Experimental hall
The setup
Beam pipe
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
Board computer
A. KerekRoyal Inst. of Technology
Stockholm
D. NovakATOMKIDebrecen
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
The test to be provided:
The proton fluence comparable with theexpected neutron fluence for E >100keVshould be reached. Proton energy: 60 – 200 MeV.
(F. Faccio, M. Huhtinen, 1999)
Expected fluence during 10 LHC years:At the worst region for the muon barrelNeutrons total: ~3x1010 n/cm2
Neutrons > 100 keV: ~6x109 n/cm2
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
Run
#
Beam current
[nA]
Total dose after the run
p/cm2/sec
Total dose after the run LHC years
“Beam on” Start / stop Remark
1 0 0 0 ----------- a)
2 0.5 2.8 x 108 0. 5 22:50 / 22:51 a)
3 1 9.2 x 109 15 0:01 / 0:22 b)
4 1 13.8 x 109 23 0:47 / 1:02 c)
5 0 13.8 x 109 23 ----------- a)
6 1 18.4 x 109 31 1:40 / 1:51 d)
7 0.2 20.6 x 109 34 2:14 / 2:29 a)
8 0.2 23.0 x 109 38 2:49 / 3:06 a)
9 0.2 25.3 x 109 42 3:23 / 3:42 a)
a) good operation up to the end of the run b) picture recording stopped after the 11-th picture (after 0:02:44)c) picture recording stopped after the 22-th picture (after 0:59:59)d) PC stopped after 1:42:00 (the corresponding file was not found)
Measurement, results:
The board computer worked correctly again after each reboot.There was no stop at low rate beam (runs 7, 8, 9).
10 years
of LHC
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
Board computer irradiation testBoard computer irradiation test
The image taken before the irradiation
The image taken after the irradiation
Conclusion: the tested device can be used for the project.
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Project status, Apr 2003Barrel MuonAlignment
9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy
The main messageThe main message
The last worrying unknowns in the project are answered and all of them in a positive way:
1) The board computers work in LHC environment
2) The calibration technology designed for ISR works
3) The MABs can be built without blowing up our budget.