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FM ILT Results: Mechanisms

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ILT with blue spectrometer array connected to DMC ... Flashers Blue & Red (1) blue. red. blue. red. Nylon suspensions. Copper wires. Brass wires ... – PowerPoint PPT presentation

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Title: FM ILT Results: Mechanisms


1
FM ILT Results Mechanisms
  • H. Feuchtgruber, H. Dannerbauer,
  • N. Geis, C. Hartinger, U. Klaas,
  • P. Royer

2
Overview of Sub-systems
  • Grating Launch Lock
  • Grating Mechanism
  • Chopper
  • Filter Wheel SPEC
  • Filter Wheel PHOT
  • Calibration Sources CS1, CS2
  • Heater Blue and Red
  • Flasher Blue and Red

3
Test Phases
  • Short Functional Tests Warm, LHeI and LHeII
  • Mechanism controller parameter optimization
  • ILT with blue spectrometer array connected to
    DMC
  • ILT with red spectrometer array connected to
    DMC

4
Grating Launch Lock
  • Opened during the SFT warm
  • on 12-Oct-06
  • Closed on 4-Jan-07 (warm)

12-Oct-06
4-Jan-07
5
Grating Mechanism (1)
  • Results
  • - Control loop parameters have been
  • optimized for operation with
  • DMC EQM
  • - Grating health check successfully
  • passed
  • - Accessible range measured
  • - Variety of scans with different
  • step-sizes explored
  • - Duration of step transitions and
  • stability on position is within spec.
  • - We plan to do still better on with
  • the FM DMC and improved OBSW
  • - Grating speed can be set to
  • 4 deg/s as a compromise between
  • small step stability vs. grating
  • speed for large transitions.

6
Grating Mechanism (2)
  • Results
  • - Control loop parameters have been
  • optimized for operation with
  • DMC EQM
  • - Grating health check successfully
  • passed
  • - Accessible range measured
  • - Variety of scans, different
  • stepsizes and speeds explored
  • - Duration of step transitions and
  • stability on position is within spec.
  • - We plan to do still better on with
  • the FM DMC and improved OBSW
  • - Grating speed can be set to
  • 4 deg/s as a compromise between
  • small step stability vs. grating
  • speed for large transitions.

7
Grating Mechanism (3)
  • Results
  • - Control loop parameters have been
  • optimized for operation with
  • DMC EQM
  • - Grating health check successfully
  • passed
  • - Accessible range measured
  • - Variety of scans and different
  • stepsizes explored
  • - Duration of step transitions and
  • stability on position is within spec.
  • - We plan to do still better on with
  • the FM DMC and improved OBSW
  • - Grating speed can be set to
  • 4 deg/s as a compromise between
  • small step stability vs. grating
  • speed for large transitions.

8
Grating Mechanism (4)
  • PACS-ME-ECR-009 Expansion of grating angular
    throw
  • - CQM 40.6 degrees insufficient accessible
    wavelength range
  • - FM accessible range 44.62 degrees
  • working range 43.1 degrees (low grating
    output)
  • order measured specification
  • 45000 1050000
  • n3 73.2µm 34.8 µm 72µm - 56µm
  • n2 109.8µm 52.2µm 105µm -
    72µm
  • n1 219.6µm 104.3µm 210µm - 105µm

9
Grating Mechanism (5)
  • Problems
  • - Limit switch at positive end is
  • broken (NCR-ME-229)
  • - Non-optimum software handling of
  • grating open loop operation
  • (corrected in latest DMC OBSW)
  • - Grating position information was lost
  • when turning the filter wheel
  • (corrected in latest DMC OBSW,
  • SPR-0651)

10
Chopper (1)
  • Requirements for science operations
  • deviations from final position lt 1 duty cycle gt
    80 _at_10Hz
  • Requirements for calibration operations
  • deviations from final position lt 2 duty cycle gt
    70 _at_10(5)Hz
  • Duty cycle of chopper has been within
    specification at sub-
  • system level
  • Chopper performance is coupled to DMC
    capabilities
  • Control loop optimization hasnt been completed
    due to
  • NCR-233

11
Chopper (2)
12
Chopper (3)
Science FOV Measured - up 13ms - down
34ms Specification 10ms
Need for asymmetry Parameters in control loop
identified
13
Chopper (4)
Calibration FOV Measured - up
33ms - down 60ms Specification 15(30)ms
14
Chopper (5)
  • Non-conformance PACS-ME-NCR-233
  • ? Chopper has been de-integrated, further
    investigations
  • ongoing, replace by original FM chopper
  • DMC OBSW modifications defined

15
Filter Wheels (1)
  • Both wheels turned during all
  • test phases, at warm and cold
  • temperatures without any
  • problems.
  • Positional reproducibility of FW
  • PHOT is within specification, FW
  • Spec positional accuracy is not
  • yet determined due to bug in
  • commanding script (corrected in
  • the meantime). However
  • there are no indications that it
  • may not be in spec.

16
Filter Wheels (2)
  • Both wheels turned during all
  • test phases, at warm and cold
  • temperatures without any
  • problems.
  • Positional reproducibility of FW
  • PHOT is within specification, FW
  • Spec positional accuracy is not
  • yet determined due to bug in
  • commanding script (corrected in
  • the meantime). However
  • there are no indications that it
  • may not be in spec.

17
Calibration Sources (1)
  • Time constants
  • Homogeneity
  • Emissivity

18
Calibration Sources (2)
  • Time constants

- Complete tests not carried out. - Heat-up
from off-state to 70.5(CS1)/76.5(CS2) K -
Measurements are done in spectroscopic HK
mode t(70.5K) 2700sec t(76.5K) 3100sec
  • Worse than req. (Stable after 30min), but only
    slightly different from CQM

19
Calibration Sources (3)
  • Time constants

- Complete tests not carried out. - Heat-up
from off-state to 70.5(CS1)/76.5(CS2) K -
Measurements are done in spectroscopic HK
mode t(70.5K) 2700sec t(76.5K) 3100sec
Stability in spec.
  • Worse than req. (Stable after 30min), but only
    slightly different from CQM

20
Calibration Sources (4)
  • Time constants

- Complete tests not carried out. - Heat-up
from off-state to 70.5(CS1)/76.5(CS2) K -
Measurements are done in spectroscopic HK
mode t(70.5K) 2700sec t(76.5K) 3100sec
Stability in spec.
  • Worse than req. (Stable after 30min), but only
    slightly different from CQM

21
Calibration Sources (4)
  • Homogeneity

CS2
CS1
22
Calibration Sources (5)
  • Homogeneity FOV OGSE BB1 at 22K
  • ? Significantly improved since CQM, however
    there is still some small structure on top

Straylight issues to be investigated still !
CS2 76.5K
CS1 70.5K
23
Calibration Sources (6)
  • Emissivity CS2 (76K)
  • Measured against
  • cryogenic OGSE
  • blackbody at 30K
  • - Values are within
  • specified range,
  • however change from
  • CQM to FM not effective
  • The analysis did not yet
  • include straylight effects
  • and accurate temperature
  • derivation for CS2
  • The OGSE BB was not
  • measured at consistent
  • chopper positions

CQM values for CS2
24
Heater Blue Red
  • Both heaters passed the
  • functional tests
  • 2 different current settings during
  • SFT warm

25
Heater Blue (1)
26
Heater Blue (2)
expected optimum
IID-B Spec.
27
Heater Blue (3)
  • Detector
  • curing test
  • Ih10mA

28
Flashers Blue Red (1)
blue
red
blue
red
Emitter
Brass wires
Nylon suspensions
Copper wires
29
Flashers Blue Red (2)
blue
red
  • Short functional tests passed

30
Flashers Blue Red (3)
Blue _at_ 0.7mA
Red _at_ 0.4 mA
  • Measure a sequence
  • of flasher currents to
  • check illumination
  • pattern (up into
  • saturation)

31
Flashers Blue Red (3)
blue
red
41
40
26
24
4
5
23
27
46
26
68
56
15
35
Peak signal
Peak signal
Shadow by walls
  • Calculated illumination pattern of the arrays
    (prior to cone)
  • Including the detector cones results in
    significantly
  • different signal pattern as seen by detector
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