COS Cycle-19 Calibration Phase-1
Last Revised:
Proposal ID:
Title:
PI:
Co-I(s):
7/19/11
12718
COS/FUV Recovery after Anomalous Shutdown
T. Wheeler
A. Welty
J. McPhate (UC Berkeley)
--------------------------------------------------------------------------# Orbit estimates are TOTAL for all of Cycle-19;
Total Prime Orbits:
n/a
External Parallel Orbits:
n/a
Internals or no-impact orbits: n/a2
Comments on orbit estimate
This is a contingency proposal only.
--------------------------------------------------------------------------# This section should be written with a GO audience in mind -- use
# Calibration plans in WFPC-2 handbook as a guide.
Purpose: This proposal is designed to permit the conservative, safe, and
orderly recovery of the COS/FUV detector after an anomalous HV shutdown.
Description: Anomalous shutdowns can occur because of bright object
violations, which trigger the Count Rate Protection Monitor or the Global
Software Monitor. Anomalous shutdowns can also occur because of hardware
anomalies or failures. The cause of the shutdown should be thoroughly
investigated and understood prior to recovery. Wait intervals are required
after each test for data analysis. COS event Flag 3 is used to prevent
inadvertent FUV usage.
The recovery procedure is divided into two distinct parts with Part 1
consisting of a slow HV ramp-up with diagnostics and darks, followed by a
ramp-down, HV off, and setting of event Flag 3. Time is allotted for
cognitive UC Berkeley, COS Instrument Scientist, and engineering to examine
data dumps, science exposures, and housekeeping telemetry. If all is well,
the go-ahead will be given to clear Flag 3 and proceed with the second HV
ramp-up.
Part 2 consists of a normal ramp-up with diagnostics and darks, followed by a
ramp-down, HV off, and setting Flag 3. Again, UC Berkeley, COS Instrument
Scientist, and engineering will examine data dumps, science exposures, and
housekeeping telemetry. If all is well, the go-ahead will be given to clear
Flag 3 and precede with normal FUV science programs.
Prior to the beginning of Visit 1, Flag 3 must be cleared by the ground via
real-time commanding. This can be done as soon as the anomalous HV shutdown
is understood and the go-ahead is given to proceed with the recovery. This is
based on Cycle 18, proposal 12431.
An outline of the activities follows. The numbers in parentheses correspond
to the visit numbers.
(1) Uninhibit the DCE.(set dce_FUVInhibitMode = FALSE and do other CS
cleanup), take diagnostic data (DCE RAM dump), and transition the
detector from Boot to Operate. (Boot will be the state of the detector
after being Inhibited.) Special commanding is used to uninhibit the DCE
and to dump the DCE RAM. Regular recon commanding is used for the Boot
to Operate transition.
(2) Turn on the FUV HV and ramp to HVLOW. Special commanding will be used to
execute the FUV Operate to HVLOW recon. Diagnostics are taken (DCE RAM
dumps) after each transition.
(3) Take a 1-hour dark exposure followed by diagnostics (DCE RAM dump).
(4) Ramp the HV from HVLOW to HVNOM for each segment (169,167) during a
1080.0 second DARK exposure. Take diagnostics (DCE RAM dumps) after.
(5) Take a 2nd 1-hour dark exposure followed by diagnostics (DCE RAM
dump).
(6) Ramp the HV down, turn it off, and set Flag 3.
At this point, UC Berkeley, COS Instrument
examine data dumps, science exposures, and
well, this time the go-ahead will be given
requirement is that diagnostic and science
Science Team.
(11) Take diagnostics
the next step.
of Visit 12.
Scientist, and engineering will
housekeeping telemetry. If all is
to proceed with the Part 2. A
data be fast-tracked to the
(DCE RAM dumps). The ground must clear Flag 3 before
(12) Turn-on the HV and ramp to HVLOW with diagnostics (DCE RAM dumps).
(13) Take a 1-hour dark exposure followed by diagnostics (DCE RAM dump).
(14) Ramp the HV from HVLOW to HVNOM (nominal value for each segment
169,167) during a 1000.0 second DARK exposure. Take diagnostics (DCE RAM
dumps) after.
(15) Take a 2nd 1-hour dark exposure followed by diagnostics (DCE RAM dump).
(16) Ramp the HV down, turn it off, and set Flag 3.
UC Berkeley, COS Instrument Scientist, and engineering will again examine
data dumps, science exposures, and housekeeping telemetry. If all is well,
this time the go-ahead will be given to clear Flag 3 and proceed with normal
FUV science. It is requested that diagnostic and science data be fast-tracked
to the Science Team. No FUV activities be scheduled within 48 hours after the
completion of Visit 16 to allow for data analysis.
Accuracy:
n/a
Comments on Accuracy:
n/a
Products:
n/a
--------------------------------------------------------------------------# Link to Cycle 19 Science
# Use the GO + GTO Phase 1 exposure listing and derived statistics
# posted on WWW.
Fraction of science programs supported by this calibration: 89% of COS total
exposure time. This is a contingency procedure only.
List categories of science which can't be executed until after this proposal:
n/a
why:
n/a
List categories of science which are best performed contemporaneous with this
proposal:
n/a
why:
--------------------------------------------------------------------------# THE REST OF THIS FORM IS FOR INTERNAL USE
--------------------------------------------------------------------------Observation summary: The recovery procedure is divided into two distinct
parts with Part 1 consisting of a slow HV ramp-up with diagnostics and darks,
followed by a ramp-down, HV off, and setting of event Flag 3. Cognitive UC
Berkeley, COS Instrument Scientist, and engineering will examine data dumps,
science exposures, and housekeeping telemetry. If all is well, the go-ahead
will be given to clear Flag 3 and proceed with the Part 2 HV ramp-up.
Part 2 consists of a normal ramp-up with diagnostics and darks, followed by a
ramp-down, HV off, and setting Flag 3. Again, UC Berkeley, COS Instrument
Scientist, and engineering will examine data dumps, science exposures, and
housekeeping telemetry. If all is well, the go-ahead will be given to clear
Flag 3 and precede with normal FUV science programs.
# Target information (copy for each target)
Target Name.
: n/a
RA.
: n/a
Dec.
: n/a
Flux (and units).
: n/a
Visibility window (if known or relevant): n/a
Comment on choice of target
: n/a
#
#
#
#
#
#
Exposure list plan at the Phase I level. Be as complete as reasonable.
If possible information should be complete enough to allow easy
submission of a Phase 2 from this form. However, if you have to leave
some of the fields blank below, or want to provide the information
in another format, that is acceptable. (Make sure you do the BOP checking
though, as this is a phase-1 issue.)
------------------------------------------------------------------------**** This list of exposures should be executed ONLY in the event of ****
****
an anomalous COS/FUV shutdown
****
------------------------------------------------------------------------Table of exposures (copy for each exposure as appropriate/desired):
Visit 1, Exposure 1: FUV Inhibit to Boot
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 10s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a, no detector HV
BOP Predicted Global Count Rate for FUV : n/a, no detector HV
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Sequence 1-3 Same Alignment.
It is assumed that this will be the first FUV activity on an SMS and that
the CS is in Operate state. Therefore, the starting FUV state is set to
HVLOW, which is the nominal SMS boundary state.
Unhibit the DCE for commanding by setting dce_FUVInhibitMode == FALSE in
the CS FSW. Several other houskeeping tasks are also cleaned up.
.
Special commanding: Instruction = ELRECOVERF.
Visit 1, Exposure 2: DCE Diagnostic RAM Copy and Dump
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 60s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a, no detector HV
BOP Predicted Global Count Rate for FUV : n/a, no detector HV
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Copy and dump DCE RAM provides a dump of the FUV HV and AUX power current
monitors (HVIA, HVIB, AUXI). Each has 1000 (possibly 1024) a sample
buffer that monitors the current at 1ms sampling (looping through,
overwriting the data that is 1 second old), and a cumulative histogram
of the current values (this would be a buffer of 256 values for each
monitor)."
Special commanding: Instruction = ELCOPYDCE.
Visit 1, Exposure 3: Transition FUV from Boot to Operate
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 180s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Use normal recons.
.
Special commanding: Instruction = RLBTTOPF.
Visit 2, Exposure 1: Turn FUV HV On
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 90s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Sequence 1-4 Same Alignment.
Turn on the FUV high voltage, but do not ramp it up. Exp time has 50s
added to model AFTER BY on exp 2.
.
Special commanding: Instruction = ELOPTHOF.
Visit 2, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit 1, Exposure 2
Visit 2, Exposure 3: Ramp FUV HV to HVLOW
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 1070s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Ramp the FUV HV to the HVLOW value at 10 sec/step. The end state is HVLOW
to reflect this. Visit 03's start state is set to match this end state.
Exp time has 45s added to simulate AFTER BY on exp 2.
Special commanding: Instruction = ELHOTHLF.
Visit 2, Exposure 4: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit 1, Exposure 2
Visit 3, Exposure 1: FUV Dark at HV Low
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Time-Tag
Spectral Element
: Default
Aperture
: Default
Central Wavelength
: n/a
Exposure Time
: 3600s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV
BOP Predicted Global Count Rate for FUV
ETC PID IDs for Count Rates
Special Requirements or options
:
:
:
:
n/a
n/a
n/a
Buffer time = 3600
Special commanding
Comments:
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Visit 3, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2
Visit 4, Exposure 1: FUV Dark during Ramp
Target or lamp
:
Type of Acquisition
:
Detector for observation
:
Operating mode
:
Spectral Element
:
Aperture
:
Central Wavelength
:
Exposure Time
:
Number of Iterations
:
BOP Predicted Local Count Rate for FUV :
BOP Predicted Global Count Rate for FUV :
ETC PID IDs for Count Rates
:
Special Requirements or options
:
from HVLOW to HVNOM
Dark
n/a
COS FUV
Time-Tag
Default
Default
n/a
1080s
1
n/a
n/a
n/a
Buffer time = 1000
Special commanding
Comments:
Ramp the FUV HV from HVLOW to HVNOM at 10 sec/step during this exposure.
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Special commanding: Instruction = ELHLTHVFX.
Visit 4, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2
Visit 5, Exposure 1: FUV Dark at HVNOM
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Time-Tag
Spectral Element
: Default
Aperture
: Default
Central Wavelength
: n/a
Exposure Time
: 3600s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Buffer time = 3600
Comments:
Take a 1-hour dark exposure with the HV at HVNOM.
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Visit 5, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2.
After the completion of Visit 5, all diagnostic and science data from
Visits 1-5 should be fast-tracked to the COS Science Team.
Visit 6, Exposure 1: FUV HVNOM to HVLOW
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 35s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Sequence 1-3 Same Alignment.
Special commanding: Instruction = RLHNTHLF.
Visit 6, Exposure 2: FUV HVLOW to Operate
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 50s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Special commanding: Instruction = RLHLTOPF.
Visit 6, Exposure 3: Set COS Event Flag
Target or lamp
Type of Acquisition
Detector for observation
Operating mode
Spectral Element
Aperture
Central Wavelength
Exposure Time
Number of Iterations
BOP Predicted Local Count Rate for FUV
BOP Predicted Global Count Rate for FUV
ETC PID IDs for Count Rates
3
:
:
:
:
:
:
:
:
:
:
:
:
Dark
n/a
COS FUV
Data
n/a
n/a
n/a
1s
1
n/a
n/a
n/a
Special Requirements or options
: Special commanding
Comments:
.
Special commanding: Instruction = ELFLAG3.
Visit 11, Exposure 1: Clear COS Event Flag 3 via R/T Commanding
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 1s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: n/a
Comments:
Sequence 1-2 Same Alignment
Provide a planned uplink opportunity to clear COS event flag 3 to allow
FUV high voltage commanding. It is okay if the flag is cleared earlier
and this uplink is not used.
Visit 11, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2.
Visit 12, Exposure 1: Turn FUV HV On
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 90s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Sequence 1-4 Same Alignment.
Turn on the FUV high voltage, but do not ramp it up. Exp time has 50s
added to model AFTER BY on exp 2.
.
Special commanding: Instruction = ELOPTHOF.
Visit 12, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit 1, Exposure 2
Visit 12, Exposure 3: Ramp FUV HV to HVLOW
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 1070s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Ramp the FUV HV to the HVLOW value at 10 sec/step. The end state is HVLOW
to reflect this. Visit 13's start state is set to match this end state.
Exp time has 45s added to simulate AFTER BY on exp 12.
Special commanding: Instruction = ELHOTHLF.
Visit 12, Exposure 4: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit 1, Exposure 2
Visit 13, Exposure 1: FUV Dark at HV Low
Target or lamp
:
Type of Acquisition
:
Detector for observation
:
Operating mode
:
Spectral Element
:
Aperture
:
Central Wavelength
:
Exposure Time
:
Number of Iterations
:
BOP Predicted Local Count Rate for FUV :
BOP Predicted Global Count Rate for FUV :
ETC PID IDs for Count Rates
:
Special Requirements or options
:
Dark
n/a
COS FUV
Time-Tag
Default
Default
n/a
3600s
1
n/a
n/a
n/a
Buffer time = 3600
Special commanding
Comments:
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Visit 13, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2
Visit 14, Exposure 1: FUV Dark during Ramp from HVLOW to HVNOM
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Time-Tag
Spectral Element
: Default
Aperture
: Default
Central Wavelength
: n/a
Exposure Time
: 1000s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Buffer time = 1000
Special commanding
Comments:
Ramp the FUV HV from HVLow to HVNom at 3 sec/step during this exposure..
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Special commanding: Instruction = ELHLTHVFX.
Visit 14, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2
Visit 15, Exposure 1: FUV Dark at HVNOM
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Time-Tag
Spectral Element
: Default
Aperture
: Default
Central Wavelength
: n/a
Exposure Time
: 3600s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Buffer time = 3600
Comments:
Take a 1-hour dark exposure with the HV at HVNOM.
Delete the HOME alignment created by this exposure via pmdb -delete. ISQL
required for the DUMP created by this exposure.
Update QASISTATE: COS FUV HVLOW HVLOW.
Visit 15, Exposure 2: DCE Diagnostic RAM Copy and Dump
Comments:
Same as Visit1, Exposure 2.
After the completion of Visit 5, all diagnostic and science data from
Visits 1-5 should be fast-tracked to the COS Science Team.
Visit 16, Exposure 1: FUV HVNOM to HVLOW
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 35s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Sequence 1-3 Same Alignment.
Special commanding: Instruction = RLHNTHLF.
Visit 16, Exposure 2: FUV HVLOW to Operate
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 50s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
Special commanding: Instruction = RLHLTOPF.
Visit 16, Exposure 3: Set COS Event Flag 3
Target or lamp
: Dark
Type of Acquisition
: n/a
Detector for observation
: COS FUV
Operating mode
: Data
Spectral Element
: n/a
Aperture
: n/a
Central Wavelength
: n/a
Exposure Time
: 1s
Number of Iterations
: 1
BOP Predicted Local Count Rate for FUV : n/a
BOP Predicted Global Count Rate for FUV : n/a
ETC PID IDs for Count Rates
: n/a
Special Requirements or options
: Special commanding
Comments:
.
Special commanding: Instruction = ELFLAG3.
--------------------------------------------------------------------------# Special needs of this proposal?
This proposal is run to reactivate the COS FUV following an anomalous
shutdown.
Scheduling: As needed
Prerequisites: (e.g., specific SMOV proposal; command development?)
PDB update?
On-board table update?
(Specify table name if known e.g. SIAF).
(Specify table name if known e.g. CCDBadPixelTable)
# Special Requirements:
Real time?
Y
Special commanding?
Y
Quick Data turnaround?
Y (time-tags and engineering telemetry)
Special timing required? N
Other?
N
Describe (& justify) special requirements: The engineering telemetry for each
step is required to evaluate the safety for proceeding.
------------------------------------------------------------------------# Analysis Plan per Anomalous Shutdown
Expected FTE weeks for analysis:
Required turnaround on analysis (weeks):
Data volume (Mb needed for analysis):
Special software needed for analysis? (Describe):
0.4
0.2 per test
n/a
None
Description of analysis Plans: (1-2 paragraphs)
Analysis is carried out by the cognitive UC Berkeley, COS Instrument
Scientist, and engineers within 24 hours of each test to examine data dumps,
science exposures, and engineering telemetry. The darks and time-tag images
are examined for unusual spatial or temporal features.The engineering
telemetry data is examined (voltages, currents, temperatures, relay position,
status, and event counts) for agreement with predicted values from previous
ground and on-orbit tests or model-predicted values.