!  File:  3308C.PROP
!  Database:  PEPDB
!  Date:  19-FEB-1994:02:30:28

coverpage:

  title_1:         WFPC KSPOT INTERNAL REFLECTION ENGINEERING TEST
    proposal_for:  CAL/WFC
    pi_title:      DR.
    pi_fname:      GLENN
    pi_lname:      SCHNEIDER
    pi_inst:       ST SCI
    pi_country:    USA
    pi_phone:      301-338-4717
    wf_pc:         Y
! end of coverpage

abstract:

    line_1:        Recent WFC KSPOT exposures have exhibited a substantial non-linear
    line_2:        region of enhanced image intensity preferentially near one edge
    line_3:        of CCD 2 (W2).  This engineering test proposal will determine if
    line_4:        this is an artifact which results from an internal reflection off the
    line_5:        back of the "preflash" filter which is left in the optical beam
    line_6:        following the activation of the internal calibration lamps.

!
! end of abstract

general_form_proposers:

  lname:           WESTPHAL
    fname:         JAMES
    title:         DR.
    mi:            A.
    inst:          CALTECH
    country:       USA

!

  lname:           PICK
    fname:         SCOTT
    inst:          JPL
    country:       USA

!

  lname:           SCHNEIDER
    fname:         GLENN
    inst:          STSCI
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        2
    section:       1
    line_1:        This proposal will perform an engineering test to determine whether
    line_2:        or not the WFPC SOFA mechanism must be cleared prior to taking KSPOT
    line_3:        exposures.
    line_4:        The default operating mode for the WFPC now is to preflash all exposures.
    line_5:        Preflashing KSPOT exposures leaves filters in place in the SOFA
    line_6:        mechanism prior to turning on the KSPOT lamp.  Such KSPOT exposures have
    line_7:        exhibited anomalous characteristics on the WFC side which may be due to
    line_8:        scattered light off the back of the filter closest to the pyramid.  A
    line_9:        diffuse image formed from near one outer edge of W2 with peak intensities
    line_10:       of ~30% of full-well (nearly twice that of the KSPOTS themselves).  It
    line_11:       is conjectured light from the KSPOT lamp, shining through the Baum spot, is
    line_12:       reflected back to the pyramid off of the "preflash" filter nearest the
    line_13:       pyramid.  This conjecture may be affirmed (or disproven) by taking two
    line_14:       WFC KSPOT exposures, one with the "preflash" filters in the beam and one
    line_15:       with the SOFA clear.  If this extraneous intensity seen in W2 KSPOTS is
    line_16:       indeed due to this possible source of internal reflection then this
    line_17:       knowledge must be folded into the operating scenario for performing KSPOT
    line_18:       exposures (i.e., the SOFA mechanism must be cleared prior to turning on
    line_19:       the KPOTS lamp).

!

  question:        3
    section:       1
    line_1:        The KSPOT exposures will be taken in the WFC: one not preflashed (with
    line_2:        the SOFA clear of any filters), one preflashed (which will leave the
    line_3:        preflash filters in the beam).

!

  question:        5
    section:       1
    line_1:        NO RT requirements.
    line_3:        Note for SPSS:  To assist in scheduling these internal observations,
    line_4:        these exposures MAY be taken inside of the SAA (i.e., the SAA 05
    line_5:        avoidance rule for the WFC may be lifted for these exposures).  This
    line_6:        is NOT a requirement.

!

  question:        7
    section:       1
    line_1:        Data reduction and analysis will be performed at STScI on the
    line_2:        "Development cluster" VAXes used by SESD (DEVVAX  and/or IDTVAX).

!
!end of general form text

general_form_address:

  lname:           SCHNEIDER
    fname:         GLENN
    category:      PI
    inst:          ST SCI

!

  lname:           WESTPHAL
    fname:         JAMES
    mi:            A.
    title:         DR.
    inst:          CALTECH
    addr_1:        MS 175
    city:          PASADENA
    state:         CA
    zip:           91125
    country:       USA
    phone:         818-356-4900

!

  lname:           PICK
    fname:         SOTT
    category:      CON
    inst:          JPL
    country:       USA
    phone:         301-338-4834

!
! end of general_form_address records

! No fixed target records found

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      KSPOTS
    config:        WFC
    opmode:        IMAGE
    aperture:      ALL
    sp_element:    NONE
    num_exp:       1
    time_per_exp:  DEF
    priority:      1
    param_1:       PRE-FLASH=NO,
    req_1:         SEQ 1.0-2.0 NON-INT;
    req_2:         CYCLE 0/ 1-2;

!

    linenum:       2.000
    targname:      KSPOTS
    config:        WFC
    opmode:        IMAGE
    aperture:      ALL
    sp_element:    NONE
    num_exp:       1
    time_per_exp:  DEF
    priority:      1
    param_1:       PRE-FLASH=YES,
    param_2:       PURGE=YES,

!
! end of exposure logsheet

! No scan data records found