W. Aalders FPU CDR 1-3 July 2003 HIFI 1 FPU CDR MCS HIFI MECHANISMS 1.Focal Plane Chopper (FPC) 2.Diplexer Rooftop Mirror Translator (DRT) 3.Pivot development Presented by Wim Aalders

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders2 Focal Plane Chopper 1 DM to be delivered to the FCU-DM; 2 QM’sone to be delivered to the FCU-CQM, another to be subjected to long duration qualification tests 1 FM to be delivered to the the FCU-FM 1 set of critical spare parts (pivots, connectors, motor) to refurbish a QM to FM spare when necessary. During the development of the FPC there shall be:

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders3 FPC Requirements Functional Requirements Rotation of M6 from –4.8º to 8º Fast movement from –4.8º to 0º -3 to 0 arcmin at the sky 20 msec full amplitude change 5 Hz square, 80% duty cycle Slow movement from 0º to 8º i.e Calibration mode HBB & CBB

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders4 FPC Requirements Additional Requirements Positional accuracy: 1 arcmin (0.6 sky) Lifetime 10 8 cycles fast mode 10 5 cycles slow mode (i.e. calibration mode) Power consumption < 2 mW in fast mode < 3 mW in calibration mode

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders5 FPC Layout (DM)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders6 FPC Layout (DM)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders7 FPC Layout (DM)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders8 FPC Layout (DM)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders9 TESTS (on FPC-DM) Performance RT) –Angle vs current –Angle vs time Vibration RT) Cryo-performance –Health check

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders10 Rotation vs current

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders11 Rotation vs time

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders12 Vibration response (FPC DM)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders13 Diplexer Roof top mirror Translator 1 DM type A to be delivered to the FCU-DM; 2 QM’stype A to be delivered to the FCU-CQM 6 FM’s type A to be delivered to the the FCU-FM 4 FM’s type B to be delivered to the the FCU-FM 1 FMtype A as a spare 1 FMtype B as a spare During the development of the DRT there shall be:

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders14 DRT Requirements Functional Requirements Translation of rooftop mirror of ± 150 µm Precision and stability 0.2 µm Power consumption < 0.5 mW Aperture > 15 mm Nominal Optical Pathlength Difference 12.5 mm for type A (channels 3,4 and 5) 20.8 mm for type B (channels 6-low and 6-high)

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders15 Translation principle

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders16 DRT Layout

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders17 Monolithic Roof top mirror

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders18 Roofmirror Fabrication Tool

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders19 DRT-QM#1

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders20 Detail

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders21 Hysteresis without ringing Sigma= 89.9 nm, FWHM=211.7 nm

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders22 Hysteresis with ringing Sigma= 63.4 nm, FWHM=149.2 nm

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders23 Mechanisms QM and FM schedule

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders24 DRT-QM AIV Schedule

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders25 DRT QM’s  Production Documents complete  Manufacturing complete  Assembly 90% finished  Alignment (TPD) August  Test Programme on time  Delivery Dec on time

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders26 DRT FM & SFM AIV Schedule

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders27 DRT FM  Parts production put out  Assembly Aug/Sep 2003  Test equipment adaptations  Testing on time  Delivery on time

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders28 FPC QM  Model (re)design complete  Manufacturing drawings  Manufacturing put out  Assembly is late  Test equipment adaptation  Qualification testing is late  Delivery is late

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders29 Planning Compilation

W. Aalders FPU CDR 1-3 July 2003 HIFI 30 Flexible PIVOT Development

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders31 Pivot requirements 1.Strength [N] 2.Fatigue resistance [N] 3.Torque rate [N.mm/rad]  Launch survival  Life time, cycles  Power and response time

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders32 Pivot Construction

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders33 Pivot Buckling

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders34 Pivot development (1) History TRW-Lucas Bendix Chromium steel 420 Used in balloon and ISO instruments Deemed risky for crystalline structure Inconel Bendix Specials Little guarantees for quality Too expensive

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders35 Pivot developments (2) Developments of other parties –BE-System (CNES, LAM): inadequate –Zeiss monolithic CuBe: inadequate SRON’s own development –Monolithic SS-304 version: abandoned –C-Flex CuBe welded/brazed Inconel brazed/brazed

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders36 Pivot selection

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders37 Inconel fully brazed

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders38 TC-1

HIFI FPU CDR 1-3 July 2003MECHANISMS W. Aalders39 TC-2