160µm Focal Plane Survey, Fine

Principal: Jocelyn Keene
Deputy: Jane Morrison, Bill Wheaton
Data Monkey(s):
Priority: Necessary
Downlink Priority: Normal
Analysis Time: Campaign Q: 3600 minutes, Campaign V: 3600 minutes, Campaign W: 3600 minutes. Combining all results 120 minutes.

Last Updated:

Objective

To measure the pixel locations and the relative locations (i.e. array orientation, scale,and distortion) as a function of scan mirror angle for the 160 µm array.

Description

Task will duplicate MIPS-234 calibrating the mirror at 5 positions.
This task is run in campaigns Q, V and W. The data from each campaign is processed separately by the MIPS and IPF teams. The IPF team then combines the results from all the campaigns. The results from the IPF multi-run are used to update Frame Table 15. The frame table updates for all the campaigns can be found in the following table: Frame Table Updates.

Data Collected

The observing strategy (IER) is similar to the 160 µm coarse survey, except that no W dithers are done and only one v dither is performed. In addition, in order to calibrate the mirror the IER is repeated 5 times at 5 different mirror positions, resulting in 900 DCEs. The 900 DCE data set is sent as a single data set to the IPF team for analysis. As in the other surveys observations are performed at the left-side, center and right-side of the array. The parameter that sets the absolute positions of the these columns is adjustable. So if we have missing pixels we can put the columns on either side of the gap. At each column 60 observations are performed, thus a total of 180 observations are obtained for each IER. Repeating the IER 5 times using 5 different sets of mirror positions results in 900 observations. All 900 observations are included in one CA file (centroided file) that is sent to the IPF team for analysis.

Calibration Star

For the selected calibration star see the IER for this survey. The requirements on the SED focal plane calibration star are as follows:

In CVZ

Mips requirements: stellar brightness corresponding to S/N of 30 (3 sec integrations) 0.212 Jy, K mag -0.54

Observing Strategy

Definitions:

W axis direction is defined by the Frame Table, and is always within +/- 90 degrees of the TPF z axis as projected on the sky. Motion along this axis corresponds to motion in the spacecraft motion (left/right on array).

V axis direction is defined by the Frame Table, and is always within +/- 90 degrees of the TPF y axis as projected on the sky. Motion along this axis corresponds to motion in the scan mirror direction (up/down on array).

W offset, the amount of motion in the W direction which results in moving the target along the array to produce images on the left, middle and right of array.

V offset, the amount of motion in the V direction which results in moving the target along the v axis.

160 µm FPS observational parameters:

W offset = 100 arc seconds

V offset = 12 arc seconds

V dither = 6 arc seconds

mirror locations for chopping .

Run 1: position 1 = 0, position 2 = -75
Run 2: position 1 = -75, position 2 = 75
Run 3: position 1 = 75, position 2 = -75
Run 4: position 1 = -37.5, position 2 = 37.5
Run 5: position 1 = 37.5, position 2 = -37.5

Observational Strategy

For each set of mirror positions, starting at an initial position on the left-side of the array take 60 observation. Move to the center of the array and take another 60 observations. Then move to the right-side of the array and take 60 observations.

Step 1 : PCRS observation

Step 2. Observations on Left side of array: Position the telescope at initial V and W offset positions, in the arrangement the target will fall on the left side of the array.

A. Two Observations
- turn stim off take DCE
- turn stim on take DCE.
B. 12 observations (2 observations repeated 6 times with Vstep between each set)
- Turn stim off and take 1 DCEs at mirror position 1.
- Move mirror to position 2 and take 1 more DCEs.
- Move spacecraft according to V step of 16 arc seconds - repeat 2 observations 5 more times
C. Two Observations
- turn stim off take DCE
- turn stim on take DCE.
D. Go back to initial V and W position, and take 12 observations
- Turn stim off and take 1 DCEs at mirror position 1.
- Move mirror to position 2 and take 1 more DCEs.
- Move spacecraft according to V step of 16 arc seconds - repeat 2 observations 5 more times
E. Two Observations
- turn stim off take DCE
- turn stim on take DCE.

Step 3 (30 observations)

Dither in the V direction ( 6 arc seconds)
Repeat steps A-E

Step 4: PCRS observation

Step 5 (60 observations near the center of the array)

Move the spacecraft in the W direction by W offset (100 arc seconds)
repeat steps 2-3 (except Woffset will put target at the center of the array)

Step 6 (60 observations on right-side of array)

Move the spacecraft in the W direction by W offset (100 arc seconds)
repeat steps 2-5 (except Woffset will put target at right-side of array)

Step 7 Repeat steps 1-6 for the other 4 mirror sets (180 observation at each mirror set for a total of 900 observations)

Number of observations for each mirror set: 180. Repeated 5 times for a total of 900 observations.

Data Reformatting Requirements

Array Data Desired:

160 µm

Data Reformatting Option:

Normal - One FITS multi-image extension file per AOR. (Output from MIPS DATPACK, one DCE in each image extension.

Task Dependencies

MIPS-234: 160 µm Focal Plane Survey, Coarse
MIPS-912: 160 µm Darks
MIPS-919: 160 µm illumination correction
IPF run is to occur after FTU# 14 (PAC filer and OET CTA Frame Tool inputs)

Calibration Dependencies

Calibration product needed:
160 µm IC
160 µm darks
Items needed by IPF team for this task to run with the IPF filter software:
- IPF team Labeling convention for files: XXYYYZZZ.m where,
  - XX for type of file (example FF for Offset file, IF for output data, CS for Centroid supplemental file)
  - YYY for the version number, '001' to '499' for Coarse survey, '501' to '999' for Fine Surveys
  - ZZZ for the Frame table number associated with the Prime Frame being calibrated. Use 121 for the 70 µm SED mode.
- CB file: The OET Centroid File and Generation Tool is run to generate a centroid B file (CB file)
- A and As files: SIST generates a A and AS files (attitude history files) and emails them to IPF team.
- FF file: The MIPS team generates an Offset file (match derived frames to prime frames) and ftps to IPF team (this can be done before launch and has been).
- CS file: The MIPS team generated a CS file (Centroid supplemental file) to IPF team. This can be done before launch and has been.

Output and Deliverable Products

Output of MIPS DAT:
A calibrated data file with appropriated header keywords.
The name of this file will be "mips_YYY087.fits", where where "YYY" is 3-digit string denoting run number, and "087" is IPF code for 160 µm data.
This file is sent to B. Wheaton's centroiding program.
Output from Centroid program:
A centroided data file.
The calibrated data is centroided and the centroided data filename is CAYYY087.m, where the YYY is the version number. This file is sent to the IPF team.
Output from IPF team which the MIPS team analyzes:
- IF file: output data from a single IPF run.
- MF file: output data from a multi-run IPF run
The FF file (offset file) and CS file (centroid supplemental file) have been generated and sent to the IPF team. Unless the results from campaign J result in significant changes, these files will not be changed for campaign k.

Data Analysis

Process data for Campaign Q:
1. JPL MIPL transfers downlink data to SSC.
2. SSC downlink ops processes data places results in sandbox.
3. SSC MIPS IST uses FTZ to transfer data from sandbox to SSCIST21. The MIPS IT team repackages the data to run with the Arizona data analysis tool (DAT).
4. The data are calibrated using the MIPS DAT.
  1. Run mips_sloper : with following options:
    - mips_sloper filename
    - IF we do not use the default directory for the calibration files. Then use the -j option.
    - -j dirname : directory below $MIPS_DIR/Cal to find calibration files.
  2. Run mips_caler : with following options:
    - mips_caler -I illumination_correction_filename -D dark_filename-C pathname
    - -C path is the path to where the calibration files live. If you do not use the -C then the default will be used.
    - -D dark filename.
    - -I illumnation correction filename
  3. The calibrated data file mipsfps_YYY087.fits (YYY a 3-digit integer string, identifying the run number) is a FITS multi-extension image file, one extension per DCE.
  4. Run Xsloper_view and check to make sure data seems reasonable:
5. The calibrated data file mipsfps_YYY087.fits (YYY a 3-digit integer string, identifying the run number) is placed on SSCIST21: /mipsdata/fps/inpdat. File is linked to processing subdirectory (currently /home/sscmip/users/waw/fps).
6. The MIPS IDL Centroid File Generation tool, mipspos.pro, is run according to detailed instructions in sscist21:/home/sscmip/users/waw/fps/fps.doc.
7. The output files CSYYY087.m and CAYYY087.m are placed on the TFS at SSC and transfered to DOM at JPL.
8. IPF team retrieves previously approved spreadsheet and SSC's CA/CS files from DOM.
9. IPF filter is run using input files: CB,A,AS,O, CA, CS files and the previously approved spreadsheet.
10. The output files (IF files) are placed on the DOM for MIPS team to analyze.
11. End of Campaign Q.
The entire process above is repeated for Campaign R.
The entire process above is repeated for Campaign W.
Results from the IPF filter for Campaign Q,R and Campaign W are analyzed by the MIPS team and compared to one another for consistency.
On approval of consistency, the IPF team runs the IPF multi-run tool and produces an output file, MF, that is placed on the DOM.
The MIPS IT and IST team analyzes the multirun results.

Software Requirements

STINYTIM for PSF generation.
SSC downlink system.
MIPS DAT
IDL for IDL program mipspos.pro for star centroiding.
At JPL, IPF Filter program.

Actions Following Analysis

After each run 235-Q, 235-R and 234-Q the MIPS team recieves the results from the IPF team and reviews them.
The MIPS team reviews the MF file from the multi-run tool and approves or disapproves.
When approved, SSC generates mini-spreadsheet for review and approval by MCCB, followed by handoff to JPL OET, and uplink of FTU #15.

Failure Modes and Responses

Failure of one campaign (Q, R or W) to produce useful data
- If one of the runs looks bad, then go back and analyze the data better. We may need to plot the data to look for bad data, we may need to edit the CA file and resend it to the IPF team.
- We might need to ask the IPF team to look closer at their analysis.
- If one set is bad and can not be fixed, then use data from other campaign, if data appear reasonable and change is not large
Results of Q,R & W inconsistent, neither obviously bad, then average the results.
Both results are bad - then reschedule observations.