1. NA62 straw tracker DCS Straw tracker overview Bulk power supply Power supply distribution and monitoring LV + monitoring HV Temperature monitoring Gas gain monitoring/control Gas system distribution?

2. NA62

3. NA62 straw tracker Tracker consists of – 4 chambers, each chamber consists of – 4 views, each view consists of – 30 covers (basic element for readout, services, etc), each serves – 16 straws In total ~7600 straws (~480 per view) In DCS and readout we also work with ½ view unit – ½ view can be ‘real’ 30/2=15 covers (mainly for readout) – Or 14/16 covers (mainly for power and gas distribution) Power requirements LV – Basic unit is cover, 5-8V/1A (+ safety 0.2A=1.2A) – Basic distribution unit is ½ view which requires 16*1.2A= ~20A minimum – Patch panel receiving bulk power supply line is serving 16 covers (only 1 PP type used also for 14 covers) HV – Basic unit is cover, 2kV – Basic distribution unit is ½ view which requires 2kV/2(4)mA – Patch panel receiving bulk power supply line is serving 16 covers (only 1 PP type used also for 14 covers)

4. NA62 straw tracker To be controlled/monitored HV system – Bulk PS – HV patch panel LV system – Bulk PS – LV patch panel VME crates housing readout modules Thermo-sensors – Part of LV patch panel Gas system – not in this talk Gas gain control/monitoring

5. Bulk power supply Wiener MPOD – Each chamber has 1 MPOD crate equipped with 1HV and 4/8 LV modules – New system extensively tested in PH/ESE – HW exceptional performance – SW numerous crashes – Continue collaboration with Wiener CAEN – Currently no suitable system – Offered new crate compatible with current LV+HV modules – Should arrive to CERN for evaluation in Feb/March If none proves working close to end 2012 – Combination of current reliable supplies – LV Wiener – HV CAEN For test beam and technical runs we use available PS

6. LV patch panel Purpose – To distribute and control (on/off) LV power supply for 16 covers (1/2 view) – To monitor 1.2, 2.5, 3.3 and incoming voltages for every cover – To measure current for every cover – To measure temperature on every cover (single ADC channel with current source for PT1000) – To measure temperature on few places on the detector (double ADC channel with pt100 as used other places in NA62) ELMB based 2pcs/view; 8pcs/chamber served by 1 CANBUS link Design finished; layout proceeding Production starts in January 2012; available in March Would like to test it in ‘dry’ technical run in summer

7. HV patch panel Purpose – To distribute and control (on/off) HV power distribution for 16 covers (1/2 view) ELMB based – ELMB’s serial link used to control EPLD with triplicated logic to control HV relays – Need to check HV relays in magnetic field 1 PP serving 16 covers (1/2 view) Share CANBUS link with LV PP Design should start in January Available in April Would like to test/participate in ‘dry’ technical run

8. VME crates We have 1pc of 9U VME crate per chamber (4 total) and 1pc 6U TTC crate Need to control and monitor standard functions – On/off – Power – Temperature – Fans? – System reset Share CANBUS link with LV and HV PPs? TEL62 crate?

9. Gas gain monitoring (control?) Chamber 1 equipped with small vacuumed chamber for 4 pcs short (30 cm?) straws Fe55 (other source?) Each straw equipped with preamp, shaper, peak- sensing ADC Gas gain monitored (or controlled through HV) with multichannel analyser Results stored in DCS Time scale not really decided – End 2012 or beginning 2013

10. Requirements All measurement values (currents, voltages, temperatures, gas gain, humidity, etc) stored with reasonable interval ~1min ? (even more?) – Can be compressed/zero-suppressed Possibility to define ‘region of interest’ with much higher speed for tuning voltages, etc. – Usually ½ view – Update ~1s basic view for shift operator is chamber (1 out of 4) – Zooming to view – Up to single cover Out of limits (current, voltage, temperature, gas gain) marked in red and giving warning (?) to the shift staff