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JWST's WFSC NIRCam Fine Phasing Template, available in the Astronomer’s Proposal Tool (APT), is used for fine phasing and LOS jitter monitoring. 

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Introduction

In WFSC NIRCam Fine Phasing the user may select two different types of activities. The user may both select Line-Of-Sight (LOS) jitter monitoring and Fine Phasing in a single visit, or either type may be selected separately. In monitoring situations, both LOS and Fine Phasing would be selected. A visit would start with a Target Acquisition to place the selected target in the center of a 64 x 64 subarray. Next, a series of 8 x 8 subarray images will be taken (center 8x8 pixels of the TA subarray). Lastly, the Fine Phasing activities would be executed. No additional Target Acquisition is needed for the Fine Phasing activities.

Note that there is an implicit 2-point dither with these observations. See Table F2.11 (link).

The WFSC NIRCam Fine Phasing Template consists of the following parameters:

FieldDetailsValues Notes
General Information   
Observation Number assign observation number

number


   Observation Labelprovide observation labeltextoptional
Observations Commentsprovide observation commentstextoptional
 Target Nameselect Target Namechoose from listfrom Target List
 Special Requirementsspecify special requirementschoose from listif needed
Template Specific Information   
Sensing Type
select Sensing TypeChoose from list 
 Moduleselect ModuleA, B 
LOS Jitter Information (if SENSING TYPE = LOS JITTER or BOTH)
Acquisition Targetselect Target Namechoose from listfrom Target List
Acquisition Subarray  

based on selection of Module

Acquisition Filterdefault value

F212N

Long Wave pupil is in the FLAT (opaque) position.

Acquisition Readout Pattern

default valueRAPID 
Acquisition Number of Groups/Integrationselect number of groups/integrationchoose from list 
Acquisition Number of Integrations/Exposuredefault value1 
LOS Subarray  

based on selection of Module
LOS Images Filtersdefault valueF200WLong Wave pupil is in the FLAT (opaque) position.
LOS Images Readout Patterndefault valueRAPID 
LOS Images Number of Groups/Integrationspecify number of groups/integration1 - 1000 
LOS Images Number of Integrations/Exposurespecify number of integrations/exposure1 - 65535 
WESC Fine Phasing Information (if SENSING TYPE = FINE PHASING)
Diversityselect diversitychoose from list 

Plus/Minus 8 Waves Defocus (F212N) Imaging Parameters Information

Filters 
see table 
Readout Patternselect readout patternRAPID, BRIGHT1 
Number of Groups/Integrationspecify number of groups/integrationnumber 
Number of Integrations/Exposurespecify number of integrations/exposurenumber 

Plus 12 Waves Defocus Imaging Parameters Information

Filters 
see table.
Readout Pattern

select readout pattern

RAPID, BRIGHT1
Number of Groups/Integrationspecify number of groups/integrationnumber 
Number of Integrations/Exposurespecify number of integrations/exposurenumber

 

 Plus/Minus 4 Waves Defocus Imaging Parameters Information

Filters 
see table 
Readout Patternselect readout patternRAPID, BRIGHT1
Number of Groups/Integrationspecify number of groups/integrationnumber 
Number of Integrations/Exposurespecify number of integrations/exposurenumber

 

 Plus/Minus 8 Waves Defocus (F187N) Imaging Parameters Information

Filters 
see table 
Readout Patternselect readout patternRAPID, BRIGHT1 
Number of Groups/Integrationspecify number of groups/integrationnumber 
Number of Integrations/Exposurespecify number of integrations/exposurenumber 

General Information  

The following parameters are generic to all templates, and are not discussed in this article:  Observation Number,  Observation Label, Observations Comments, Target Name,  and Special Requirements. 

Target Name
Anchor
TargName
TargName

Select the TARGET NAME [TBD] from the list of targets previously entered (see list of targets).

Sensing Type
Anchor
SensingType
SensingType

SENSING TYPE = FINE PHASING, LOS JITTER, BOTH

This parameter specifies the type of sensing observation to be executed.

Note for developer: For SENSING TYPE=BOTH or LOS JITTER, do not allow user to select Special Requirement WAVEFRONT SENSING with a value of SENSING_CONTROL, since the resulting visit file will not contain the on-board script for wavefront control commanding. Also, do not duplicate the exposures when SENSING TYPE=BOTH.

Module
Anchor
Module
Module

MODULE [ MODULE] = A, B

This parameter specifies the module to be used to obtain the data.

WFSC LOS Jitter Monitoring
Anchor
WFSCLOSJitterMonitoring
WFSCLOSJitterMonitoring

If SENSING TYPE = LOS JITTER or BOTH, a target acquisition is performed to place the target star in the center of a 64x64 subarray. The center 8x8 pixels will be used for a series of NIRCam images.

Target Acquisition

The following parameters are used to define the Target Acquisition.

Acquisition Target
Anchor
AcquisitionTarget
AcquisitionTarget

Select the TARGET NAME [TACQ TARGET] from the list of targets previously entered.  

Acquisition Subarray
Anchor
AcquisitionSubarray
AcquisitionSubarray

SUBARRAY = SUB64FP1A, SUB64FP1B
This parameter specifies the subarray used for acquisition images, and is SUB64FP1A for Module A and SUB64FP1B for Module B.

Acquisition Filter
Anchor
AcquisitionFilter
AcquisitionFilter

The Target Acquisition FILTER is F212N. Note that the Long Wave pupil will be in the FLAT (opaque) position.

Acquisition Readout Pattern
Anchor
AcquisitionReadoutPattern
AcquisitionReadoutPattern

The READOUT PATTERN [TACQ PATTERN] for target acquisition is RAPID.

Acquisition Number of Groups/Integration
Anchor
AcquisitionNumberOfGroups
AcquisitionNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [TACQ NGROUPS] = 3, 5, 9, 17, 33, 65

This parameter specifies the number of groups in an integration.

Acquisition Number of Integrations/Exposure
Anchor
AcquisitionNumberOfIntegrations
AcquisitionNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE specifies the number of times the integration is repeated, and is always 1.

 LOS Subarray
Anchor
LOSSubarray
LOSSubarray

SUBARRAY [SUBARRAY] = SUB8FP1A, SUB8FP1B

This parameter specifies the subarray used for LOS jitter images, and is SUB8FP1A for Module A,and SUB8FP1B for Module B.

 LOS Images Filters
Anchor
LOSImagesFilters
LOSImagesFilters

The FILTER [FILTSHORT] for LOS Jitter is F200W. Note that the Long Wave pupil will be in the FLAT (opaque) position.

 LOS Images Readout Pattern
Anchor
LOSImagesReadoutPattern
LOSImagesReadoutPattern

The READOUT PATTERN [PATTERN] for LOS Jitter is RAPID.

  LOS Images Number of Groups/Integration
Anchor
LOSImagesNumberOfGroups
LOSImagesNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [NGROUPS] = 1 - 1000

This parameter specifies the number of groups in an integration.

 LOS Number of Integrations/Exposure
Anchor
LOSImagesNumberOfIntegrations
LOSImagesNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] = 1 - 65535

This parameter specifies the number of times the integration is repeated.

WFSC Fine Phasing

WFSC Fine Phasing will be executed several times during commissioning to measure OTE wavefront errors. It will also be executed approximately every 2 days during the mission to measure and optionally correct the wavefront error. Fine Phasing measurements consist of a series of steps that collect NIRCam images of a star using the Weak Lenses. Each step within the series consists of two exposures separated by a small (few pixel) dither. There are four types of exposures: Plus/Minus 8 Wave Defocus (F212N), Plus 12 Waves Defocus, Plus/Minus 4 Waves Defocus, and Plus/Minus 8 Waves Defocus (F187N). All the exposures of a given type use the same exposure parameters. The parameter DIVERSITY allows the user to select the types of exposures.

If a wavefront correction is required, then a Wavefront Control File containing one mirror control group should be uploaded prior to the execution of the observation.

A Wavefront Control File (provided by the WFSC Scientist) may be attached to each visit by the PPS Operator.

In addition to the following template parameters, this template will require a value be specified for the Special Requirement WAVEFRONT SENSING.

Note that this type of observation cannot be obtained with other parallel observations or as a parallel to normal science observations.

 Diversity
Anchor
Diversity
Diversity

DIVERSITY [DIVERSITY] = ALL, ALL+187N, PM8

This parameter specifies the type of focus diversity images to obtain.

If ALL is specified, images with +8, -8, +12, -4, and +4 waves defocus (a total of 10 exposures) are obtained. These +8 and -8 waves defocused images use the F212N filter.

If ALL+187N is specified, the images described above are obtained, with the addition of images with +8 and -8 waves defocus using the F187N filter (a total of 14 exposures).

If PM8 (Plus and Minus 8 waves) is specified, only the +8 and -8 waves defocus images (using F212N) are obtained (a total of 4 exposures). Note that each step results in two exposures being obtained.

 Plus/Minus 8 Waves Defocus (F212N) Imaging Parameters
Anchor
PlusMinus8WavesDefocusF212N
PlusMinus8WavesDefocusF212N

Filters
Anchor
PlusMinus8WavesDefocusF212NFilters
PlusMinus8WavesDefocusF212NFilters

The following filters will be used to obtain the data.

Plus/Minus 8 waves defocus with F212N (DIVERSITY=ALL, ALL+187N, PM8)
Step number
SW PupilSW FilterLW PupilLW FilterSubarray

1 (-8 defocus)

WLM8

F212N

F405N

F444W

FULL

2 (+8 defocus)

WLP8

F212N

F405N

F444W

FULL

Readout Pattern
Anchor
PlusMinus8WavesDefocusF212NReadoutPattern
PlusMinus8WavesDefocusF212NReadoutPattern

READOUT PATTERN [READOUT PATTERN] = RAPID, BRIGHT1

This field specifies the readout pattern to be used to obtain the data.

 Number of Groups/Integration
Anchor
PlusMinus8WavesDefocusF212NNumberOfGroups
PlusMinus8WavesDefocusF212NNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in an integration. (warning)The range is 1-10.

 Number of Integrations/Exposure
Anchor
PlusMinus8WavesDefocusF212NNumberOfIntegrations
PlusMinus8WavesDefocusF212NNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated. (warning)The range is 1-10.

   Plus 12 Waves Defocus Imaging Parameters
Anchor
Plus12WavesDefocusImaging
Plus12WavesDefocusImaging

Filters
Anchor
Plus12WavesDefocusFilters
Plus12WavesDefocusFilters

The following filters will be used.

Plus 12 waves defocus (DIVERSITY=ALL, all+187N)
Step numberSW PupilSW FilterLW PupilLW FilterSubarray

3 (+12 defocus)WLP8WLP4F405NF444WFULL

Readout Pattern
Anchor
Plus12WavesDefocusImagingReadoutPattern
Plus12WavesDefocusImagingReadoutPattern

READOUT PATTERN [READOUT PATTERN] = RAPID, BRIGHT1

This field specifies the readout pattern to be used to obtain the data.

Number of Groups/Integration
Anchor
Plus12WavesDefocusImagingNumberOfGroups
Plus12WavesDefocusImagingNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in an integration.

Number of Integrations/Exposure
Anchor
Plus12WavesDefocusImagingNumberOfIntegrations
Plus12WavesDefocusImagingNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated.

Plus/Minus 4 Waves Defocus Imaging Parameters
Anchor
PlusMinus4WavesDefocus
PlusMinus4WavesDefocus

Filters
Anchor
PlusMinus4WavesDefocusFilters
PlusMinus4WavesDefocusFilters

The following filters will be used.

Plus/Minus 4 waves defocus (DIVERSITY=ALL, ALL+187N)
Step numberSW PupilSW FilterLW PupilLW FilterSubarray

4 (-4 defocus)

WLM8

WLP4

F405N

F444W

FULL

5 (+4 defocus)

CLEAR

WLP4

F405N

F444W

FULL

Readout Pattern
Anchor
PlusMinus4WavesDefocusReadoutPattern
PlusMinus4WavesDefocusReadoutPattern

READOUT PATTERN [READOUT PATTERN] = RAPID, BRIGHT

This field specifies the readout pattern to be used to obtain the data.

Number of Groups/Integration
Anchor
PlusMinus4WavesDefocusNumberOfGroups
PlusMinus4WavesDefocusNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in an integration.

Number of Integrations/Exposure
Anchor
PlusMinus4WavesDefocusNumberOfIntegrations
PlusMinus4WavesDefocusNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated.

 Plus/Minus 8 Waves Defocus (F187N) Imaging Parameters
Anchor
PlusMinus8WavesDefocusF187N
PlusMinus8WavesDefocusF187N

Filters
Anchor
PlusMinus8WavesDefocusF187NFilters
PlusMinus8WavesDefocusF187NFilters

The following filters will be used.

Plus/Minus 8 waves defocus with F187N (DIVERSITY=ALL+187N)
Step numberSW
Pupil
SW FilterLW
Pupil
LW
Filter
Subarray

6 (-8 defocus)

WLM8

F187N

F405N

F444W

FULL

7 (+8 defocus)

WLP8

F187N

F405N

F444W

FULL

Readout Pattern
Anchor
PlusMinus8WavesDefocusF187NReadoutPattern
PlusMinus8WavesDefocusF187NReadoutPattern

READOUT PATTERN [READOUT PATTERN] = RAPID, BRIGHT1

This field specifies the readout pattern to be used to obtain the data.

Number of Groups/Integration
Anchor
PlusMinus8WavesDefocusF187NNumberOfGroups
PlusMinus8WavesDefocusF187NNumberOfGroups

NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in an integration.

Number of Integrations/Exposure
Anchor
PlusMinus8WavesDefocusF187NNumberOfIntegrations
PlusMinus8WavesDefocusF187NNumberOfIntegrations

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated.

Anchor
ChangeLog
ChangeLog
Change log

Expand

Version 3 (April 19, 2019)

  1. Editorial change (moved change log to main article)


Version 2 (August 24, 2017)

  1. PR 87834 - add developer note to Sensing Type parameter


Version 1 (May 30, 2017)

  1. This is the converted Word File from Chapter 60.
  2. PR 87783 - revised TA NGroups
  3. PR 87895 - revised names of Number of Groups and Integrations
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JWST WFSC NIRCam Fine Phasing template

JWST WFSC NIRCam Fine Phasing template parameters

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