CALBLOCK-PV-010: NISP LED flats¶
Observation configuration file¶
Scheduling¶
Once, early during PV phase.
In case of failure, repeat at next possible opportunity.
Time-critical¶
Must be executed at least one week before CALBLOCK-PV-016: NISP Persistence.
Objective¶
Obtain NISP LED flats for all 5 LEDs at fluences of 4, 9, 16, 25, and 32 kADU (above the 10 kADU baseline, and in the FPA corners). The highest fluence deviates from the quadratic scaling to avoid saturation in the last group of the ramp and in the center of the focal plane, where NI-CU fluxes are 10% higher than in the corners. These flats will also serve calibration of the brighter-fatter effect. During routine calibrations, flats will be taken at 16 kADU fluence, only.
Observations¶
Parallel schedule suggestion: CALBLOCK-PV-024: VIS On-sky Nonlinearity
Take 30 flats (to allow for burn-in and cosmic rejection) per LED setting using the photo-MACC mode. A waiting time for LED flux stabilization is not required. Persistence / burn-in is assumed to stabilize to a steady state over the execution time of the procedure for each LED setting. Exposures must be obtained continuously.
The LED flux levels are adjusted such that we can use the photo-MACC mode. This matches the wide survey mode and eliminates the need for additional, matching darks. The electron fluxes are 90, 200, 360, 570, and 730 e-/s.
The length of the dark duration after the highest fluence must be at least 4.5h so that the persistence flux can decay to less than 0.023 e-/s/pixel (R-CAL-B-NP-1476).
for LED in [A, B, C, D, E]:
for fluence in [90, 200, 360, 570, 730] e-/s:
Take 30 photo-MACC exposures
Take 30 spectro-MACC darks
#Flux |
Flux |
Int |
PWM |
Int |
PWM |
Int |
PWM |
Int |
PWM |
Int |
PWM |
#[e-/s] |
[ADU/fr.] |
[mA] |
[%] |
[mA] |
[%] |
[mA] |
[%] |
[mA] |
[%] |
[mA] |
[%] |
# |
A |
A |
B |
B |
C |
C |
D |
D |
E |
E |
|
90 |
65.5 |
5.0 |
30.0 |
5.0 |
41.5 |
5.0 |
30.8 |
5.0 |
19.8 |
5.0 |
18.9 |
200 |
145.5 |
10.0 |
35.0 |
10.0 |
47.4 |
10.0 |
36.1 |
5.0 |
38.6 |
5.0 |
37.9 |
360 |
261.9 |
30.0 |
21.3 |
30.0 |
27.8 |
30.0 |
21.3 |
10.0 |
23.4 |
10.0 |
29.8 |
570 |
414.6 |
30.0 |
33.3 |
30.0 |
43.9 |
30.0 |
34.0 |
10.0 |
35.2 |
30.0 |
12.6 |
730 |
531.0 |
30.0 |
42.5 |
60.0 |
28.7 |
30.0 |
43.6 |
10.0 |
44.3 |
30.0 |
15.3 |
Fulfilling¶
CALPRODUCT-NI-010: NISP LED Flats
CALPRODUCT-NI-003: NISP Brighter-fatter Effect
CALPRODUCT-NI-001: NISP Bad Pixel Map
CALPRODUCT-NI-009: NISP Inoculation (DEACTIVATED) (partially; effect probably not detectable after a few hours)
Targets and pointing constraints¶
Pointing: Straylight suppression as per MOCDA-SYS-003.
Instrument configuration¶
Instrument: NISP in flat-field configuration
Methodology / Uplink procedure¶
Entity: NISP
Commanding Method:
Dither Sequence: None
In-orbit duration¶
In-orbit Duration: 27.8 h
111s for photo-MACC, 30 frames per LED, 5 fluences for each of 5 LEDs.
111s *30*5*5 = 23.1 h for the flats
565s *30 = 4.7 h for the darks
Data volume¶
750*NP + 30*NS = 49140 MB
Processing input¶
Ground Processing Input Data: TBD
Data Description: 750 photo-MACC NISP flats, 30 NISP spectro darks
Processing tools¶
TBD
Validation¶
The fluence should be within 5 kADU of the targeted values, and the spatial irradiance as expected (approximately 10% drop-off from the center to the field corner).
Recovery¶
Repeat at next opportunity.
Quality control parameters¶
DataModel: https://gitlab.euclid-sgs.uk/
Contact person¶
NISP-P calibration scientist