24 um IOC Darks

Principal: James Muzerolle
Deputy: Karl Gordon
Data Monkey(s): Kate Su, Casey Papovich
Priority: Critical
Downlink Priority: Normal
Analysis Time: 24 hours
Last Updated:


Objective

Dark current and read noise measurements.

Description

Point to the 24 µm dark position. Take 10-second dark measurements using the Dark IER, and 10-second read noise measurements using the Read Noise IER.

Data Collected

35 10-second SUR DCEs from the Dark IER, 50 10-second SUR DCEs from the Read Noise IER.


// EXP_WRITER_VERSION=610
// ****************************************************************************
//
// Creation Date: Mon Oct 21 22:16:55 PDT 2002
//
// Expansion File: /epi02/ioc/m190/mips_drk24um_10s35.exp
//  
//
// ****************************************************************************
//
// 
// Keyword Section
// 
IERID                         0x000000000000                          // IER Identifier
IERType                       MIPS                                    // Type of IET
IERVersion                    6.2.9 Final                             // Spotier Version
IERTitle                      drk24um_10s35                           // Title of IER
Target                        'dark24um_10s35'                        // Target Name
IERTargetType                 Fixed                                   // Target type of IER
Ra                            17:15:50.00                             // Target RA
Dec                           +65:25:25.400                           // Target DEC
NaifId                                                                // NaifId for this IER
TotalExposureTime             365.94744                               // seconds
TotalExecutionTime            423.1000000000001                       // seconds
TotalSlewTime                 0.0                                     // seconds
TotalSettlingTime             0.0                                     // seconds
Slew Tax                      0.0                                     // seconds
Special Overhead              0.0                                     // seconds
TotalUplinkLoad               391                                     // bytes
TotalCommandStorageLoad       96                                      // bytes
TotalStringStorageLoad        156                                     // bytes
TotalNumberOfInstructions     36                                      // Instruction count
TotalDownlinkLoad             7147153                                 // bytes
CommandDCE                    35                                      // Number of DCEs commanded
TotalDCE                      105                                     // Number of DCEs in database
VisibilityRadius              0.0                                     // Visibility radius for this IER
Expedited                     'false'                                 // Expedited for downlink processing
StartTime                     2003-106T14:02:30.000                   // StartTime for this IER
BodyStartTime                 2003-106T14:02:30.000                   // BodyStartTime for this IER
Author                        'A.Noriega-Crespo'                      // Name of IER author
Version                       '2.2  for MIPS-190'                     // Version number (set by Author)
Purpose                       '24um Darks'                            // Purpose of this IER
Notes                         'KG+CE+DMK+ANC+JM inputs'               // General notes
//
// Expansion Section
//
00:00:00.000 START                                          // Meta command indicates start of expansion
00:00:00.000 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:00:00.100 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:00:00.200 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_START_TIME              // global variable name
                             NOW                            // value or expression
00:00:00.300 INITIAL_SLEW_FIXED                             // BLOCK: SSC slew to fixed science target
                             99                             // FOVNUM
                             932250000                      // RA
                             235525400                      // DEC
                             0                              // RCA
                             0                              // DELTA_EAST
                             0                              // DELTA_NORTH
                             0                              // DELTA_V
                             0                              // DELTA_W
                             4                              // EXPOSURE_LENGTH
                             200                            // SIGMA
                             0.0                            // PCRS_DET_SETTLE_TIME_1
// SLEW MODEL: delT - 0.30000000000000004
// SLEW MODEL: raUC - 932250000
// SLEW MODEL: decUC - 235525400
// SLEW MODEL: pmRa - 0.0
// SLEW MODEL: pmDec - 0.0
// SLEW MODEL: startTime - 2003-106T14:02:30.000
// COMMENT: start IER w/MIPS_PHOTO
00:00:08.400 MIPS_MOBS_PHOTO                                // BLOCK: SSC change MIPS state from observe to photo
                             0x003C99A0                     // OPERCESTATE
// COMMENT: Set up the instrument for imaging
00:00:13.600 CESCANPOS                                      //
                             101                            // posindex
                             'MIPS'                         // csmode
00:00:15.600 CEGERSTCON                                     //
                             10                             // ge160rst : 4 Ge frames
                             127                            // ge70rst : 4 Ge frames
                             4                              // rstdelay : 1 Ge frame
                             'MIPS'                         // csmode
00:00:16.600 CESCANCON                                      //
                             'CHOP'                         // scanmode
                             'FWD'                          // rampdir
                             0                              // scanpos2 : 18.901 arcsec
                             2048                           // relpos1 : 2.3626 arcsec
                             2048                           // relpos2 : 2.3626 arcsec
                             0                              // stepoffset : 2.3626 arcsec
                             511                            // rampslope : 0.1 msec/2.3626 arcsec
                             'MIPS'                         // csmode
00:00:17.600 CESISTIM                                       //
                             'ALLOFF'                       // state
                             'LOW'                          // level
                             'MIPS'                         // csmode
// COMMENT: move csmm @24um dark
// COMMENT: take 35 DCEs 10sec darks
00:00:18.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             0                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             35                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
// COMMENT: end IER w/backto_mobs
00:06:49.600 MIPS_BACKTO_MOBS                               // BLOCK: SSC change MIPS state back to MIPS observe
                             0x003C99A0                     // OPERCESTATE
00:06:59.800 PCS_ATT_DET                                    //
                             'PCS_OBS_B'                    // observer
00:07:00.800 PCS_LOWRATE_MODE                               //
                             'DISABLE'                      // rate_select
00:07:01.800 PCS_PRI                                        //
                             'DISABLE'                      // disable_enable
00:07:02.800 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:07:02.900 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:07:03.000 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_END_TIME                // global variable name
                             NOW                            // value or expression
00:07:03.100 END                                            // Meta command indicates end of expansion


// EXP_WRITER_VERSION=610
// ****************************************************************************
//
// Creation Date: Wed Oct 16 20:48:17 PDT 2002
//
// Expansion File: /epi02/IOC_Repository/v6.2.2/2002_289T20_48_12_345/mips_ier910.exp
//  
//
// ****************************************************************************
//
// 
// Keyword Section
// 
IERID                         0x000000000000                          // IER Identifier
IERType                       MIPS                                    // Type of IET
IERVersion                    6.2.8 Final                             // Spotier Version
IERTitle                      mips_ier910                             // Title of IER
Target                        'mips_ier910'                           // Target Name
IERTargetType                 Fixed                                   // Target type of IER
Ra                            17:15:50.00                             // Target RA
Dec                           +65:25:25.400                           // Target DEC
NaifId                                                                // NaifId for this IER
TotalExposureTime             519.0372                                // seconds
TotalExecutionTime            612.1000000000001                       // seconds
TotalSlewTime                 0.0                                     // seconds
TotalSettlingTime             0.0                                     // seconds
Slew Tax                      0.0                                     // seconds
Special Overhead              0.0                                     // seconds
TotalUplinkLoad               477                                     // bytes
TotalCommandStorageLoad       182                                     // bytes
TotalStringStorageLoad        156                                     // bytes
TotalNumberOfInstructions     40                                      // Instruction count
TotalDownlinkLoad             10210215                                // bytes
CommandDCE                    50                                      // Number of DCEs commanded
TotalDCE                      150                                     // Number of DCEs in database
VisibilityRadius              0.0                                     // Visibility radius for this IER
Expedited                     'true'                                  // Expedited for downlink processing
StartTime                     2003-105T10:02:30.000                   // StartTime for this IER
BodyStartTime                 2003-105T10:02:30.000                   // BodyStartTime for this IER
Author                        'A.Noriega-Crespo'                      // Name of IER author
Version                       '2.3 MIPS-910'                          // Version number (set by Author)
Purpose                       '24um IOC Darks'                        // Purpose of this IER
Notes                         'JM+CE+DK_inputs'                       // General notes
//
// Expansion Section
//
00:00:00.000 START                                          // Meta command indicates start of expansion
00:00:00.000 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:00:00.100 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:00:00.200 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_START_TIME              // global variable name
                             NOW                            // value or expression
00:00:00.300 INITIAL_SLEW_FIXED                             // BLOCK: SSC slew to fixed science target
                             99                             // FOVNUM
                             932250000                      // RA
                             235525400                      // DEC
                             0                              // RCA
                             0                              // DELTA_EAST
                             0                              // DELTA_NORTH
                             0                              // DELTA_V
                             0                              // DELTA_W
                             4                              // EXPOSURE_LENGTH
                             200                            // SIGMA
                             0.0                            // PCRS_DET_SETTLE_TIME_1
// SLEW MODEL: delT - 0.30000000000000004
// SLEW MODEL: raUC - 932250000
// SLEW MODEL: decUC - 235525400
// SLEW MODEL: pmRa - 0.0
// SLEW MODEL: pmDec - 0.0
// SLEW MODEL: startTime - 2003-105T10:02:30.000
// COMMENT: start IER w/mobs_photo
00:00:08.400 MIPS_MOBS_PHOTO                                // BLOCK: SSC change MIPS state from observe to photo
                             0x003C99A0                     // OPERCESTATE
// COMMENT: Set up the instrument for imaging
// COMMENT: CSMM at 24um Dark Position
00:00:13.600 CESCANPOS                                      //
                             101                            // posindex
                             'MIPS'                         // csmode
00:00:15.600 CEGERSTCON                                     //
                             10                             // ge160rst : 4 Ge frames
                             127                            // ge70rst : 4 Ge frames
                             4                              // rstdelay : 1 Ge frame
                             'MIPS'                         // csmode
00:00:16.600 CESCANCON                                      //
                             'CHOP'                         // scanmode
                             'FWD'                          // rampdir
                             0                              // scanpos2 : 18.901 arcsec
                             2048                           // relpos1 : 2.3626 arcsec
                             2048                           // relpos2 : 2.3626 arcsec
                             0                              // stepoffset : 2.3626 arcsec
                             511                            // rampslope : 0.1 msec/2.3626 arcsec
                             'MIPS'                         // csmode
00:00:17.600 CEGESTIM                                       //
                             'AUTO'                         // stim_mode
                             63                             // stimcycle : DCEs
                             'BOTHOFF'                      // ge160fld
                             'BOTHOFF'                      // ge70fld
                             'BOTHOFF'                      // ge70flat
                             10                             // ge160dur : Two Ge Frames
                             10                             // ge70dur : Two Ge Frames
                             'MIPS'                         // csmode
// COMMENT: Read Noise for 24um 10sec 5x10 DCEs
00:00:18.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             0                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             10                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
00:02:14.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             1                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             10                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
00:04:10.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             2                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             10                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
00:06:06.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             3                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             10                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
00:08:02.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             4                              // expid
                             'NO_COADD'                     // coadd
                             9                              // framenum
                             10                             // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'd1'
// COMMENT: end IER w/backto_mobs
00:09:58.600 MIPS_BACKTO_MOBS                               // BLOCK: SSC change MIPS state back to MIPS observe
                             0x003C99A0                     // OPERCESTATE
00:10:08.800 PCS_ATT_DET                                    //
                             'PCS_OBS_B'                    // observer
00:10:09.800 PCS_LOWRATE_MODE                               //
                             'DISABLE'                      // rate_select
00:10:10.800 PCS_PRI                                        //
                             'DISABLE'                      // disable_enable
00:10:11.800 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:10:11.900 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:10:12.000 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_END_TIME                // global variable name
                             NOW                            // value or expression
00:10:12.100 END                                            // Meta command indicates end of expansion


Data Reformatting Requirements

Array Data Desired:

24 µm

Data Reformatting Option:

Special Instructions:
All DCEs for each IER should be packed into one fits file with extensions. Two files should be generated: one with 35 DCEs (darks), and one with 50 DCEs (read noise).

Task Dependencies


Calibration Dependencies


Output and Deliverable Products

Data produced by the dark IER will be used to construct a dark calibration image for use with the DAT/pipeline. Data from the read noise IER will be used to determine the read noise, checking for stability by comparing with previous ground data and earlier IOC campaigns.

Data Analysis

The data will be processed with the DAT: mips_sloper without dark subtraction, mips_caler without flat fielding (necessary only for proper input into mips_enhancer), and mips_enhancer to combine multiple DCEs generated by the dark IER into a dark current calibration image. A custom IDL script will be used to determine the read noise from the data generated by the read noise IER. Compare dark calibration image with ground-test and previous IOC dark images (when available), check for different counts, the appearance of pattern noise. IOC darks will likely contain higher counts than ground darks due to scattered light. This should be quantified, and tracked for variability. Compare read noise measurement with previous ground test (see the
24um read noise log.) and IOC measurements, check for excess noise.

Software Requirements


Actions Following Analysis

Dark calibration images should be put in the appropriate place for distribution, unless the data are significantly discrepant (i.e., excess noise). If counts are unexpectedly high, check that CSMM was at the expected dark position. Check CE and detector temperature. Check for pattern noise or larger than expected read noise. Ensure that there is no latent signal from prior exposure to a bright source.

Failure Modes and Responses

If darks are unusable, possible reasons (from the above checklist) should be logged.

Additional Notes