pacs thermal behaviour tests t. m üller, h. feuchtgruber, a. contursi, cs. kiss, sz. csizmadia

PACS SVR 22/23 June 2006

PACS Thermal Behaviour 1

PACS Thermal Behaviour Tests

T. Müller, H. Feuchtgruber, A. Contursi,Cs. Kiss, Sz. Csizmadia



Available Reports

• Thermal Behaviour Tests During EQM IMT: SPEC & PHOT , PACS-ME-TR-067, issue 1.0• Blue Spectrometer Temperature Sensor Variation – EQM IMT PACS-ME-TR-066, issue 1.0• Comparison of the nominal and the PACS/SPIRE parallel mode cooler Recycling procedures • Cooler Holdtimes of the Photometer Focal Plane Unit, PICC-KO-TR-004, Draft 0.1

As part of the PACS ILT report: • Cooler Recycling Procedure of the Photometer Focal Plane Unit AVM/CQM ILT• Thermal Behaviour Tests during CQM ILT: SPEC & PHOT



PACS EQM Cryostat Environment

To be compared with IST

and TV/TB Environment



FM IST Cryostat Environment

T101 T102

E201

P501

SV521

V503V501

S501

N511 N512

V103

V106

T112T111

P101SV123

H101 H102

H103 H104

A101 - A1XX

PPS111

RD124

E421 E441 E461

HTT

HOT

CVV

HS1 HS3

SV922

S101

N513

V504

T702, 703

T106,107

H502/H503

Legend: A: adsorberE: heat exchangerH: heaterHS: heat shield L: liquid level probeN: exhaust nozzleP: pressure sensorPPS: passive phase separatorRD: rupture discS: filterSV: safety valveT: temperature sensorV: valveVG: vacuum gauge

SV723

RD724

P701

SV921

T501

T504T506

HS2

SV121

E601

Filling port

OBA

T105 T104

V505

V506

T507

T505

L101

L701

T701, 704

L702

L102

T103

H701 H702

V105V701

V104

V102

V702

VG901

VG902

H501

T502

V502

Non-CCU components

P502

Closed !(drifting)

Tilt may affect Red Ge:Ga strap

Full



FM TV/TB Cryostat Environment

T101 T102

E201

P501

SV521

V503V501

S501

N511 N512

V103

V106

T112T111

P101SV123

H101 H102

H103 H104

A101 - A1XX

PPS111

RD124

E421 E441 E461

HTT

HOT

CVV

HS1 HS3

SV922

S101

N513

V504

T702, 703

T106,107

H502/H503


SV723

RD724

P701

SV921

T501

T504T506

HS2

SV121

E601

Filling port

OBA

T105 T104

V505

V506

T507

T505

L101

L701

T701, 704

L702

L102

T103

H701 H702

V105V701

V104

V102

V702

VG901

VG902

H501

T502

V502

Non-CCU components

P502

Empty Tilt may affect Red Ge:Ga strap



In-Flight Cryostat Environment

T101 T102

E201

P501

SV521

V503V501

S501

N511 N512

V103

V106

T112T111

P101SV123

H101 H102

H103 H104

A101 - A1XX

PPS111

RD124

E421 E441 E461

HTT

HOT

CVV

HS1 HS3

SV922

S101

N513

V504

T702, 703

T106,107

H502/H503


SV723

RD724

P701

SV921

T501

T504T506

HS2

SV121

E601

Filling port

OBA

T105 T104

V505

V506

T507

T505

L101

L701

T701, 704

L702

L102

T103

H701 H702

V105V701

V104

V102

V702

VG901

VG902

H501

T502

V502

Non-CCU components

P502

Empty



Thermal Behaviour Test: Spectroscopy (1)

• Problems:- He leak- Bugs in the script- Blue detector temperature sensors where not functional

• Remarks: - Two cover heat-up activities took place during the test, causing some impact on L1 temperatures - General upward drift of L1 temperatures, probably due to cryostat operations - Significant increase of Red detector temperature in second half of the test probably due to the He-leak effects and combined with the cryostat operations. - The internal calibration sources were not switched-on due to a bug in the command script



Blue Detector Heating in Spectroscopy

Iheater=200µA

Iheater=100µA

After Recovery of Temperature Sensor:DECB_TS_2_3

Input to thermal shimming for FM



Thermal Behaviour Test: Photometry (1)

• Problems:- He leak- Bugs in the script- excessive dissipation by bolometer group 5 (PACS-ME-NCR-163) - Timing FPGA parameters problem DMC (PACS-ME-NCR-159)- DPU CFM generated corrupted data

• Remarks: - Executed 4 times (2 with leak, 1 without, 1 parallel mode) - Ideally, more time would be required to see stabilization of CSs

• The PACS/SPIRE parallel mode worked from the thermal point of view, at the He-mass flow given during EQM IMT.




with Bias group 5 problemwithout Bias group 5 problem,

during parallel mode

PACS-ME-NCR-163



Cooler hold Time with He-leak

End of 2h10mRecycling Procedure



Cooler hold Time without He-leak

only little detector operation duringcooler hold time !

~40 hours

End of 2h10mRecycling Procedure



Thermal Behaviour Conclusions• Do not run a test with a He-Leak. Consequence: Non-Nominal He- flow scheme due to main tank leak • Absolute L1 He-flow more than a factor 10 larger than specified for FM [spec. (IID-A) = 2.1 mg/s ; actual >25 mg/s] • L1 temperatures became stable only towards the end of the test phase• Photometry: bias group 5 problem caused anomalous heat dissipation• Overall thermal behaviour of PACS was within expectations and comparable to ILT• Cooler hold time too short, even with little bolometer operations: Recy. Opt. + improved cooler filling; Cover-T ? L1-T ? Straps ? Leak ? • Cryo-cover, L2, L1 and L0 temperatures should be kept constant during thermal behaviour tests• The malfunction of at least one blue spectroscopy detector could be recovered to obtain the required FM design information.• Stabilized value of DM_CAL_SRC temperature not visible due to time constraint• Steep learning curve for implementation of related commanding scripts

pacs thermal behaviour tests t. m üller, h. feuchtgruber, a. contursi, cs. kiss, sz. csizmadia

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