1. 09/12/2009ALICE TOF General meeting 1 Online Controls Andrea Alici INFN and Universtity of Bologna, Bologna, Italy ALICE TOF General Meeting CERN building 29, 9 December 2009

2. 09/12/2009ALICE 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.

3. 09/12/2009ALICE 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.

4. 09/12/2009ALICE TOF General meeting 4 Services: Gas Distribution system Cooling system

5. 09/12/2009ALICE 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% C 2 H 2 F 4 and 7% SF 6 gas mixture

6. 09/12/2009ALICE TOF General meeting 6 Water temperature at the beginning of the cooling line Water temperature at the end of the cooling line Water Cooling system Cooling water fluxes for Read-out and Front-end electronics TOF startup on 25 September 2009 Day and time 14°C 15°C 16°C 17°C

7. 09/12/2009ALICE TOF General meeting 7 TOF Operational parameters: TOF temperature Front-end cards online monitor Full TOF dark current

8. 09/12/2009ALICE TOF General meeting 8 TOF Temperature The temperature of the TOF is continuously monitored by means of 576 + 8064 = 8640 temperature sensors. Average crate internal temperature ≈ 32°C Average temperature in the SM electronic volume ≈ 17°C

9. 09/12/2009ALICE TOF General meeting 9 TOF Temperature TOF turned off 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.

10. 09/12/2009ALICE TOF General meeting 10 TOF Temperature SuperModules Side C Side A Electronic cards off because of power supply failures A non uniformity has still to be completely understood.

11. 09/12/2009ALICE TOF General meeting 11 Front-end cards online monitor 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. 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. FEA Controller x8 LTM

12. 09/12/2009ALICE TOF General meeting 12 Front-end cards online monitor macro-pad (48 pads) single rate ≈ 33.6 Hz  0.08 Hz/cm 2 FEA Controller x8 LTM

13. 09/12/2009ALICE TOF General meeting 13 HV channels OFF, average current 1.7uA Average current drawn by full TOF @ 13 kV is less than 1uA (1568 MRPCs in total  less then 1nA per MRPC). Full TOF Dark Current HV channels @ 1kV (safe condition with unstable beams)

14. 09/12/2009ALICE 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.

15. 09/12/2009ALICE TOF General meeting 15 RESERVE

16. 09/12/2009ALICE TOF General meeting 16 Water temperature at the beginning of the line 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 Cooling system

17. 09/12/2009ALICE TOF General meeting 17

18. 09/12/2009ALICE TOF General meeting 18 pp collisions