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 …