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TPC Commissioning ALICE Technical Forum, CERN, 8 th March 2007 L. Musa

TPC Commissioning ALICE Technical Forum, CERN, 8 th March 2007 L. Musa. Outline Pre-commissioning above ground (2006) Preparing for the commissioning in the cavern (2007). TPC pre-commissioning above ground (2006).

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TPC Commissioning ALICE Technical Forum, CERN, 8 th March 2007 L. Musa

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  1. TPC Commissioning ALICE Technical Forum, CERN, 8th March 2007 L. Musa • Outline • Pre-commissioning above ground (2006) • Preparing for the commissioning in the cavern (2007)

  2. TPC pre-commissioning above ground (2006) • A first phase of TPC Commissioning was carried out above ground in the course of 2006 • Jan-Mar installation of SSW and FEE • April start of gas system • May HV (100KV) applied to FC • Jun–Dec test of all sectors (in pairs) • Each sector was operated continuously over a period of 40 hours and verified with • calibration pulser, • cosmic-muon trigger detector ACORDE • UV laser system for the generation of tracks in the detector Many TPC and ALICE sub-systems (e.g. cooling, gating grid pulser, temperature sensors, DCS, Trigger, DAQ, HLT and Offline) have been part of this commissioning programme ~300 man shift, 3588 runs, ~24 TB in CASTOR

  3. TPC pre-commissioning above ground (2006) ALICE COSMIC Trigger (ACORDE) Laser tests Cosmic tests Only two sectors can be instrumented at a time with • Low Voltage Power Supplies • Cooling Commissioning objectives • Test functionality of all components • gas stability, noise, signal tails, gain homogeneity, space resolution, etc. Each pair of sectors continuously operated over 40 hours

  4. TPC pre-commissioning (2006); some results – Noise measurements  (PASAnoise2 + ADCnoise2) = 0.70 ADC counts r.m.s. of the pedestals (sNOISE) is below 1 ADC count as required in the Technical Design Report

  5. TPC pre-commissioning (2006); some results – Cosmic tracks A B space point resolution as function of z position (cut on inclination angle tan(f) <0.05) A TDR value: 210mm / cm • Q total (total charge in the cluster) as function of z position • relative decrease over the full TPC length: ~7% • decrease due to electron capture and threshold effect B TDR value 1% / m per ppm of O2 3 ppm of O2 measured with gas chromatograph

  6. TPC pre-commissioning (2006); some results – Laser tracks Design Measured Drift velocity = 2.73 cm/mm  agreement with drift monitor detector (Goofie)

  7. Moving the TPC into the ALICE magnet Jan ‘07 TPC has been lowered in UX25 • After the alignment with respect to the beam line, the TPC has been put in parking position. • Feruary, alignment of SSW with respect to endplate, and test of the connection of FEE to the endplate (calibration pulser)  All 4356 FECs and 216 RCUs are working  All 26136 kapton cables are properly connected to the pad plane

  8. Alignment of SSW wrt endplate within mm Displacements of SSW wrt endplate should not exceed 3mm ~7 mm Readout Chamber X Front End Card kapton cable Y Z

  9. Preparing for Commissioning in UX25 • In 2006 all efforts mostly devoted to pre-commissioning in SXL2 • Still some hardware components to be finalized and/or constructed. Two examples: • Trigger Busy Box (being finalized and tested) • Trigger&DCS Interface Unit for Laser, GG Pulser and Calibration Pulser • (starting design) • Many software components to be finalized and commissioned Some examples: • Software for the configuration and monitoring of the FEE • Interface to the FERO database • Interface to ECS • DCS for some of the sub-systems and TPC FSM (Supervisory Layer) • Data Quality Monitoring

  10. Preparing for Commissioning in UX25 • Cables and cooling pipes (before connecting to the TPC all cables and cooling lines will be tested) • cables from crates to backframe (C side): April • test of cables @ backframe (C side): May • TPC wil be moved to final position (interaction point) and connected to the gas system in June (~about 1 month before reaching nominal conditions) • Connection of TPC C side June • Connection of TPC A side Aug

  11. TPC commissioning - Milestones • Test of FEE & ROC (C-side) • Turn on FEE July • Test of FEE, Trigger, DAQ, DCS and all services July • Test of ROCs July - Aug • Test of FEE & ROC (A-side) • Turn on FEE Sep • Test of FEE, Trigger, DAQ, DCS and all service Sep • TPC Commissioning with cosmic tracks, laser Sep - Oct and Kr (under study) • ALICE Commissioning Oct -Nov

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