power up of the first velo module at ip8 eddy & olaf on behalf of the velo group
TRANSCRIPT
Power Up of the First VELO Module at IP8
Eddy & Olaf
on behalf of the VELO group
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting2
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
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting3
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 CO2
• full VELO half is cooled simultaneously
Safety [interlock system]:
• LV switched off if NTC temperature > 30 ° C
cooling block
x
yz
Temperature Monitoring:
• on the cooling blocks:PT100
• on the hybrid:2 x NTC per side
Beetle
PT100
NTC
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting4
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 = Pbeam - Pdetector [-5,+2 mbar]
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting5
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
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting6
8 9 10 11 12 13 14 15 16 17 18-5
0
5
10
15
20
25
30
Time (hour)
Tem
pera
ture
(̀C
)
VSDP411pvss
TRTTAVRbase
TRTT044pvssTRTT006pvss
TRPT102tsat
Neon Pressure difference [mbar]
Accumulator = Cooling set point Cooling Cookie HX003
RF-Foil (Close to module)Module Base average
Time@18 March (Hour)
Tem
pera
ture
(ºC
), P
ress
ure
(mba
r)
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting711.6 11.8 12 12.2 12.4 12.68
9
10
11
12
13
14
Time (hour)
Tem
perature (̀C
)
VSDP411pvss
TRTTAVRbase
TRTT044pvssTRTT006pvss
TRPT102tsat
I II
III
VIV
Temperature History
I. -side on, R-side offII. R-side on, -side offIII. R-side on, -side half
onIV. both sides onV. both sides off
curr
ent -
side [
A]
NTC
tem
p. -
side [
°C]
Cooling Cookie
temperature
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting8
PV301 open
DP [
mbar]
P ≈ 0.2 mbar
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting9
Sensor Noise without Bias
R-side
not CM corrected
CM corrected
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting10
Sensor Noise with Bias
R-side
not CM corrected
CM corrected
March 27, 2008 Eddy & Olaf Nikhef VELO-meeting11
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 …