Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 1 General Status of the Barrel Muon Alignment Project The work is supported by The Hungarian Scientific Research Fund OTKA T , T034910, T 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

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 2 Introduction For those who are less familiar with the project: - 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:

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 3 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 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.

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 4 Video-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 pieces Diagonal: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 mm The assembly of the full quantity (~750 pieces) is ready (Debrecen, Budapest). Sensor quality control facility (Debrecen):

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 5 LED 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: forks are already at CERN - Next 80 by 15 May Next 300 by 15 September Last 450 by 15 March 2004 Other LED holders (diagonal, z): under design (H. Gerwig).

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 6 Fork 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

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 7 Board computer status Passed a very important milestone: irradiation test (see next slides).

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 8 Board computer irradiation test The Svedberg Laboratory (TSL), Uppsala University, Uppsala (Sweden) February 2003

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 9 Board computer irradiation test Experimental setup: Proton beam Scintillators for rate measurement PC-104 video- camera ethernet Particle: proton+ Beam energy: 95 MeV Beam size at the board computer: about Ø10 cm

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 10 Board computer irradiation test Experimental hall The setup Beam pipe

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 11 Board computer irradiation test Board computer A. Kerek Royal Inst. of Technology Stockholm D. Novak ATOMKI Debrecen

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 12 Board computer irradiation test The test to be provided: The proton fluence comparable with the expected neutron fluence for E >100keV should 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 barrel Neutrons total: ~3x10 10 n/cm 2 Neutrons > 100 keV: ~6x10 9 n/cm 2

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 13 Board computer irradiation test Run # Beam current [nA] Total dose after the run p/cm 2 /sec Total dose after the run LHC years “Beam on” Start / stop Remark a) x :50 / 22:51a) x :01 / 0:22b) x :47 / 1:02c) x a) x :40 / 1:51d) x :14 / 2:29a) x :49 / 3:06a) x :23 / 3:42a) 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

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 14 Board 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.

Project status, Apr 2003 Barrel Muon Alignment 9 April 2003, G. Bencze Workshop on "LHC Physics with High-Pt Muons in CMS'‘, Bologna, Italy Page 15 The 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.