PACS IIDR, Noordwijk 1-2 Mar 2001

ChopperChopper

R. HofferbertR. Hofferbert

D. Lemke, U. Grözinger, O. Krause, U. KlaasD. Lemke, U. Grözinger, O. Krause, U. Klaas

J. Katzer (ZEISS)J. Katzer (ZEISS)

PACS Instrument Intermediate Design ReviewPACS Instrument Intermediate Design Review1-2 Mar 20011-2 Mar 2001

ESTEC, NoordwijkESTEC, Noordwijk

Max-Planck-Institut für Astronomie, HeidelbergMax-Planck-Institut für Astronomie, Heidelberg

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Overview

• Lifetime Model• LM Tests• New Schedule• Open Points• Conclusion

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Lifetime Model

• LM manufacture started Nov 2000 at MPIA, drawings from Zeiss

• Assembly planned for Mar/Apr 2001 at Zeiss

• Design frozen

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Chopper Overview• Fully manufactured at

MPIA mechanical workshop (A. Böhm and co-workers)

housing

mirror

drive unit with 3 coils

position sensor unit

flexible pivot

temperature sensor

I/F point

pigtail with I/F connector

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Rotor

• Al 6061

• 12g, 3.23x10-7kgm2

integratedlightweight mirror

sensor magnet

drive magnets

balancing masses

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Flexural Pivots

• CuBe, double-stage 12°

• 5Nmm/rad

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

New Schedule

Mai

00

J un

00

J ul

00

Aug

00

Sep

00

Okt

00

Nov

00

Dez

00

J an

01

Feb

01

Mrz

01

Apr

01

Mai

01

J un

01

J ul

01

Aug

01

Sep

01

Okt

01

Nov

01

Kick Off

Chopper PDR

Freezing of Specs

LM Manufacture at MPI A

LM Assembly at Zeiss

LM Performance / Functional Tests

Lifetimetest at MPI A

Delivery LM

QM Manufacture at MPI A

QM Assembly at Zeiss

QM Tests

Delivery QM

Chopper CDR

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Work to do

• Consider FPU structural analysis (KT) with respect to vibration loads for the

chopper

• Implementation of “PACS black color” for the chopper

– First test on LM spare cover– Qualification for QM, FM, FS (MPE)

• Formal agreement with MPE for proposed QM/FM test procedures (#axes, temperature level)

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

Conclusion• Features of promising MPIA prototype nearly

fully adopted in Chopper design of Zeiss Specs to be achieved

• Optimized choice of materials, dimensions, linkage to be verified in LM and QM tests industrial QA guarantees outcomeof a space qualified system

• Interface to warm electronics nearly specifiedminor effort to fix cable routingand launch lock details

• Start of cold lifetime tests in June 2001• QM to be delivered in October 2001

internal

external

Chopper

PACS IIDR, Noordwijk 1-2 Mar 2001

LM TestsL M tes tp lan

w arm u n it

co ld u n it

7 7 K u n it

-----------------

EMC laboratory

a lignment te lescopecryostat

BB e lectronics

position measuringdevice

alignment te lescope

alignment te lescope

visual check

removal from cryostat

warm function check

warm-up to 300Kventing

life time cycling1/3 opereration1/3 ca libration

cold function check

life time cycling1/3 opereration1/3 ca libration

cold function check

life time cycling1/3 opereration1/3 ca libration

cold function check

cold function check

zero position

inclination anglemodulation functionpower consumption

evacuationcool-down to 4K

warm function check

in tegration in to cryostat

vibration test

EMC test

assembly

warm function check

warm-up to 300Kventing

77K function check

cold vibration x-axis

77K function check

evacuationcool-down to 77K

warm function check

in tegration in tovibration cryostat

in x position

warm function check

vibration test

MPIA