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