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Online Controls

ALICE TOF General Meeting CERN building 29, 9 December 2009. Online Controls. Andrea Alici INFN and Universtity of Bologna, Bologna, Italy. The D etector C ontrol S ystem ( DCS ) has to provide:

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Online Controls

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  1. ALICE TOF General Meeting CERN building 29, 9 December 2009 Online Controls Andrea Alici INFN and Universtity of Bologna, Bologna, Italy ALICE TOF General meeting

  2. The Detector Control System (DCS) has to provide: • A full detector description and a direct access to devices (HV and LV power supplies, VME crates, electronics cards, …); • Finite State Machine (FSM) based mechanism to synchronize the state of the detector with the operation of the physics data acquisition system and with LHC state; • Online controls. ALICE TOF General meeting

  3. Online controls means: • Continuously monitoring of important parameters as: • environmental parameters (Cavern temperature, pressure and humidity, magnets current and voltage, …) • services (gas distribution, cooling water circulation, …) • detector operational parameters (HV and LV channels current, readout status, …) • Archiving of most relevant parameter values (HV and LV channels current, boards temperature, …) to allow a further access to this information. At present 4520 parameters are being archived. • Alarm handling which provide a way to signal in real time any abnormal behavior with defined manual or automatic actions to be taken in order to recover it. More than 6480 alarms have been defined. ALICE TOF General meeting

  4. Services: • Gas Distribution system • Cooling system ALICE TOF General meeting

  5. Gas Distribution system TOF total gas flow 40 l/h per SM Ingoing and outgoing fluxes for each half of SM are monitored At present the SMs are fluxed with an 93% C2H2F4 and 7% SF6 gas mixture ALICE TOF General meeting

  6. Water Cooling system Water temperature at the end of the cooling line TOF startup on 25 September 2009 Water temperature at the beginning of the cooling line 17°C 16°C 15°C 14°C Cooling water fluxes for Read-out and Front-end electronics Day and time ALICE TOF General meeting

  7. TOF Operational parameters: • TOF temperature • Front-end cards online monitor • Full TOF dark current ALICE TOF General meeting

  8. TOF Temperature The temperature of the TOF is continuously monitored by means of 576 + 8064 = 8640 temperature sensors. Average temperature in the SM electronic volume ≈ 17°C Average crate internal temperature ≈ 32°C ALICE TOF General meeting

  9. TOF Temperature The increase of L3 temperature due by the TOF is of the order of 0.6°C in a good agreement with the ALICE request. TOF turned off ALICE TOF General meeting

  10. TOF Temperature A non uniformity has still to be completely understood. Side C Side A SuperModules Electronic cards off because of power supply failures ALICE TOF General meeting

  11. Front-end cards online monitor The main Front-end card parameters are read back by the Local Trigger Module (LTM). There are 1 LTM and 8 FEA Controller cards for each quarter of SM. LTM x8 FEA Controller The FEAC cards distribute the power supply and the threshold level to the FEAs and get back the OR signal of each couple of deasy-chained FEAs. ALICE TOF General meeting

  12. Front-end cards online monitor LTM x8 FEA Controller macro-pad (48 pads) single rate ≈ 33.6 Hz  0.08 Hz/cm2 ALICE TOF General meeting

  13. Full TOF Dark Current Average current drawn by full TOF @ 13 kV is less than 1uA (1568 MRPCs in total  less then 1nA per MRPC). HV channels OFF, average current 1.7uA HV channels @ 1kV (safe condition with unstable beams) ALICE TOF General meeting

  14. Conclusions: All the environmental parameters, services and detector operational parameters are continuously monitored. Tools have been developed to signal in real time any dangerous or abnormal behavior and to automatically recover it. From an hardware point of view the TOF detector looks working fine. ALICE TOF General meeting

  15. RESERVE ALICE TOF General meeting

  16. Water Cooling system Water temperature at the end of the line 355 (l/min) * 1.5 kQ ≈ 2,23 MJ/min 47kW/sec ≈ 2.82 MJ/min Water temperature at the beginning of the line ALICE TOF General meeting

  17. ALICE TOF General meeting

  18. pp collisions ALICE TOF General meeting

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