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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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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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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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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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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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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Board computer statusBoard computer status

Passed a very important milestone:irradiation test (see next slides).

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Board computer irradiation testBoard computer irradiation test

The Svedberg Laboratory (TSL),Uppsala University, Uppsala (Sweden)

11-12 February 2003

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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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Experimental hall

The setup

Beam pipe

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Board computer

A. KerekRoyal Inst. of Technology

Stockholm

D. NovakATOMKIDebrecen

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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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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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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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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.

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General Status of the Barrel Muon Alignment Project