Power Up of the First VELO Module at IP8 Eddy & Olaf on behalf of the VELO group

2 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Goal operate one VELO module with the final components and control software of every subsystem [cooling, vacuum, LV, HV, interlocks, DAQ] investigate the possibility to switch on several modules under Neon atmosphere check noise level compared to the assembly lab check integrity of the module

3 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Temperature Management VELO module: R- and  -sensor 2 x 16 Beetle chips [~ 2 x 15 W] hybrid core: thermal pyrolytic graphite [TPG] Cooling: 2-phase CO 2 full VELO half is cooled simultaneously Safety [interlock system]: LV switched off if NTC temperature > 30 ° C cooling block x y z Temperature Monitoring: on the cooling blocks: PT100 on the hybrid: 2 x NTC per side Beetle PT100 NTC

4 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Programme adjust position of the VELO halves to give maximal tolerance for  p while cooling turn on warm cooling of the C-side with backup chiller gradually switch on and configure the hybrid operate the hybrid with sensor bias [HV] During this procedure: carefully watch  p and hybrid temperature take data for important configurations  P = P beam - P detector  [-5,+2 mbar]

5 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Logbook 08:01 cooling: started 11:15 hybrid: configuration of all Beetles on phi-side with testpulses 11:22 vacuum: Neon injection (delta p reaches maximum value) 11:23 hybrid: reconfiguration of all Beetles on phi-side without testpulses 11:23 cooling: base plate heating switched on 11:38 hybrid: phi side switched off 11:42 hybrid: configuration of all Beetles on R-side without testpulses 11:48 hyrid: reconfiguration of all Beetles on R-side with testpulses 11:59 hybrid: Beetle configuration: R-side: all without testpulses, phi-side: only even Beetles without testpulses 12:03 hybrid: configuration of all Beetles of both sides without testpulses 12:18 hybrid: Beetle configuration: phi-side: all without testpulses, R-side: all with test pulses 12:35 hybrid: LV for both sides switched off 14:28 hybrid: Beetle configuration of all Beetles of both sides without test pulses 14:51 hybrid: control cable of R-side by mistake disconnected, causes LV to be switched off 15:00 hybrid: control cable reconnected, Beetles of the R-side switched on again with (!) testpulses 16:14 HV: start of taking IV-curve on the phi-side (unsuccessful attempt) 16:20 HV: start of taking IV-curve on the R-side (unsuccessful attempt) 17:14 HV: start of taking IV-curve on the phi-side 17:40 HV: start of taking IV-curve on the R-side 18:00 hybrid: Beetle configuration of all Beetles of both sides without testpulses (Beetles stayed with LV on) 18:17 HV: switching off for both sides 18:22 hybrid: LV for both sides switched off

6 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Neon Pressure difference [mbar] Accumulator = Cooling set point Cooling Cookie HX003 RF-Foil (Close to module) Module Base average March (Hour) Temperature (ºC), Pressure (mbar)

7 March 27, 2008Eddy & Olaf Nikhef VELO-meeting III III VIV Temperature History  -side on, R-side off II.R-side on,  -side off III.R-side on,  -side half on IV.both sides on V.both sides off current  -side [A] NTC temp.  -side [°C] Cooling Cookie temperature

8 March 27, 2008Eddy & Olaf Nikhef VELO-meeting PV301 open DP [mbar]  P ≈ 0.2 mbar

9 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Sensor Noise without Bias R-side not CM corrected CM corrected

10 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Sensor Noise with Bias R-side not CM corrected CM corrected

11 March 27, 2008Eddy & Olaf Nikhef VELO-meeting Summary and Outlook Milestone in VELO commissioning reached: VELO module successfully operated with final components for all subsystems control software allowed reliable operation module M36 in good shape [IV curve similar to previous ones] noise level lower than in assembly lab operation of a few modules under Neon atmosphere should be feasible … 41 modules to go …