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TOTEM Status Report

This report provides an overview of the status of the TOTEM detectors before the 2009 LHC run, results from the run, shutdown and completion work in 2010. It includes information on the T1 and T2 inelastic telescopes, CMS HF, and Roman Pots.

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TOTEM Status Report

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  1. TOTEM Status Report Introduction Status before the 2009 run Results from the 2009 run Shutdown work Completion work in 2010 Conclusion E. Radermacher

  2. Inelastic Telescopes: T1:3.1 < |h| < 4.7 T2: 5.3 < |h| < 6.5 CMS HF T1 10.5 m T2 ~14 m Roman Pots: RP1 RP2 Introduction: The TOTEM Detectors E. Radermacher

  3. Status before the 2009 LHC run: T1 Arms • One arm completely assembled on the beam test at H8 • mounted on installation cage • Beam test finished • Other two half arms at bldg. 188 • one with all CSC and r/o electronics mounted; • other with CSC and boards mounted beginning of March E. Radermacher

  4. CSC efficiency from muon events E. Radermacher

  5. Vertex reconstruction from pion events Cu target • Using current version of T1 reconstruction tools in TOTEM analysis SW beam monitor frame E. Radermacher

  6. Two quarters of the T2 telescope installed in CMS E. Radermacher

  7. T2 status before the 2009 LHC run • • Until mid October the full T2 detector was almost commissioned and responding correctly. HV, LV, gas, cooling, DAQ and DCS working correctly. • • However, the week before the CMS forward region closed, the minus end half started to behave erratically on the control loop. Although a large effort was made to cure the problem we did not manage to get a response from the control loop. • Therefore we had to run during December with only one half of the T2 telescope. E. Radermacher

  8. The Roman Pot Module All modules installed in the tunnel at 147 m and 220 m E. Radermacher

  9. Roman Pot Motherboard Roman Pot Motherboard Kapton pigtail The Hybrid CE07 support plate VFAT chips The “Champignon” Si microstrip edgeless detector 5 u & 5 v oriented planes Connectors to detector hybrids Connectors to detector hybrids The Si microstrip edgeless detector The Silicon Detector Package 12 Detector Packages at 220 m (61440 r/o channels) E. Radermacher

  10. RP Status before the 2009 LHC run • Advance/Complete the commissioning of the Detector System • Complete the connectivity of 12 detector assemblies • Run and control the system services with DCS • Readout commissioning with DAQ • Control loop power-up and test (CCUM, DOH…) • FE hardware probing and programming • r/o tests with CalPulse Scans and Sensors ON • First tests with beam Problems found, cured during shutdown (see later): • Low Voltage Distribution • High Voltage Power UP Only one portion of the RP System could run functionally and take data E. Radermacher

  11. Results from the 2009 run: RP Movement Result: Beam at +350 µm First Movements of the Roman Pots Towards the LHC Beam on 29 November E. Radermacher

  12. Hits and Tracks in the Silicon Detectors First Proton Track in the RP Detectors on 15 December track beam 1 2 Side view on detector planes Transverse view on first 2 detector planes Beam Beam E. Radermacher

  13. First Tracks in the T2 Telescope Event taken at 2.36 TeV E. Radermacher

  14. T2: Vertex Reconstruction and Hit Map Vertex reconstruction E. Radermacher

  15. T1 shutdown work (1) • HV/LV distribution cabling tested up to HF platform. • Only patch panels and a few pipes for gas/cooling installed on + side. • Installation of cables on YE3+ stopped for safety reason. • Fixing blocks welded on YE2+ on 18 January fixing blocks brackets E. Radermacher

  16. T1 shutdown work (2) surveyed points on “Near” side • Truss installation test and survey on ‘+’ side on Jan 27 • smooth operations with new insertion tool E. Radermacher

  17. RP shutdown work: Curing the HV short Reference frame Points of contact Sensor Pot Envelope Feet of reference frame By design 200 µm of clearance between the sensors and the thin window. Instead, to keep the parallelism between the top reference surface and the bottom of the pot, the bottom plate surface was milled reducing its thickness by 200 µm. Solution: replace the reference frames with new ones (feet 250 µm longer) to regain the original clearance. E. Radermacher

  18. RP shutdown work: the rest The LV power supply was hitting the current limit during testing operations or resetting leading to an instability of the control loop and the data transmission. Therefore the number of LV channels was increased and the cables and connections changed accordingly. To cure the HV problem all 12 detector packages were extracted, the new reference frames mounted, all sensors inspected and tested and the LV connectivity revised. Then all detector packages were re-installed and connected. Additional consolidation work: Pirani gauge on vacuum system, calibration of pressure sensors, Calibration of motors and survey of BPMs. At present final motor and interlock test with CCC. Actual status: Vacuum and Cooling system operational, DCS for LV, HV, and RADMON operational, DSS implemented. Control loop synchronized, data transmission operational, R/O with test pulses completed (99% of VFATs fully functional), trigger data transmission in test. E. Radermacher

  19. T2 shutdown work • During Christmas holidays both HF platforms where put in the garage. • We had the chance to replace the misbehaving card on Minus Near side. • We found that a chip was mechanically broken on the good quarter (Minus Far) and had to repair it. • Now the detector is working and the commissioning finished. E. Radermacher

  20. Completion work in 2010 (1) T1: • The second half of T1 has to be finalised and tested in H8. • In a technical stop during 2010 the complete T1 telescope must be installed. • This requires: • Completion of the piping on the CMS + side; • Insertion of the detector on the + side; • Truss insertion and survey on the – side followed by the installation of the detector. • We have to set up a planning with CMS to allow a correct and safe installation during a forthcoming stop. T2: • During the coming run extensive trigger studies will lead to background studies, tuning of alignment algorithms and trigger tracking efficiency. This should allow the setting up of a physics trigger to take data. E. Radermacher

  21. Completion work in 2010 (2) RP: • The same running scenario as for T2 will be adopted for the Roman pots. • Although our priority is now the running of the 220 m stations we have to assemble the detectors for the 147 m stations and produce some spares. • At present the assembly work is slowed down due to the commissioning work at IP5 leaving almost no free manpower for the assembly. • After the restart of LHC we intend to pursue the assembly, hopefully with additional personnel. • Before installation all detector packages have to be tested in the H8 test beam. • These new detectors should be installed gradually during technical stops in 2010. Priority is given to the horizontal pots (diffraction). E. Radermacher

  22. Conclusion • We gained useful experience with the data taking in December 2009. • The Roman Pots (220 m) and the T2 detector are now fully installed and ready to take data. • DCS, DAQ and software are ready for the next run. • For both detectors the trigger scenario has to be studied for efficient data taking. • Half a T1 detector is ready to be installed in a technical stop, the second will be ready soon. • We are grateful to the machine people for the continuous support for the data taking with the Roman Pots. E. Radermacher

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