The IMOD group

The group JMXi-IMOD-GRP contains the instrument model description data structures for JEM-Xi. Table 33 describes those Data Structures from that group that are used in the Scientific Analysis. A specific version of these IC files consists of a number of instances each covering a time period during which the instrument setting and response can be considered constant. The parameter name for all components and the jemx_science_analysis script is ``instMod''. When given as an empty string the script itself will define an appropriate DOL from the general IC tree (masterfile).

Table 33: Content of JMXi-IMOD-GRP Group.

Group Member	Description
Data Structures used at COR level.
JMXi-DETE-MOD	Contains the description of the JEM-Xi detector plane. Values indicate active and inactive pixels, bad anodes and their neighbours, calibration spectra overflow areas and permanent hotspots if there are any
Data Structures needed for Energy Correction
See more details in Section B.3 and Tables 35- 38.
JMXi-CALB-MOD	Lists the corrected upper limits of the bins used to convert the original 4096 energy channels into 256 calibration telemetry channels. This table is used to bin the calibration data only since this is binned in the DFEE and transmitted as housekeeping. The bin boundaries have been corrected for any ADC non-linearity that might arise during flight.
JMXi-FULB-MOD	Lists the corrected upper limits of the bins used to convert the original 4096 energy channels into 256 full imaging and spectral timing energy telemetry channels. The bin boundaries are corrected for ADC non-linearity.
JMXi-RESB-MOD	Lists the corrected upper limits of the bins used to convert the original 4096 energy channels into 8 restricted imaging telemetry channels The bin boundaries are corrected for ADC non-linearity.
JMXi-SPCB-MOD	Lists the corrected upper limits of the bins used to convert the original 4096 energy channels into 64 spectral mode telemetry channels The bin boundaries are corrected for ADC non-linearity.
JMXi-SPAG-MOD	Contains the fractional corrections in percent to the raw event energy gain coefficients for all event modes from the JEM-Xi instrument as determined by pre-flight calibrations and in-flight data. For each pixel the difference is determined compared to the average gain of the entire detector area. The second slice of this table contains the percent corrections to be applied for each anode due to anode deaths and instabilities. See also Section B.3
JMXi-FBDS-MOD	Lists the nominal energy boundaries of the PI channels for energy measurements obtained with full and spectral-timing modes. This data structure is also used as the EBOUNDS extension of the redistribution matrix file (RMF). See more details in Section B.3 and Table 38.
JMXi-RBDS-MOD	Lists the nominal energy boundaries of the PI channels for energy measurements obtained with restricted imaging mode. See more details in Section B.3 and Table 38.
JMXi-SBDS-MOD	Lists the nominal energy boundaries of the PI channels for spectra obtained in spectrum mode. See more details in Section B.3 and Table 38.
Data Structure used for position correction (see section B.4)
JMXi-CORX-MOD	Contains the corrected X positions in mm from the center of detector for Full and Restricted Imaging event modes from the JEM-Xi instrument. It is a 2D table with axes along X and Y positions where the raw values are used. See more details in Section B.4.
JMXi-CORY-MOD	The same as JMXi-CORX-MOD but for Y positions
JMXi-PLLX-MOD	Gives the X value (mm) of the lower left corner of the pixel
JMXi-PLLY-MOD	Gives the Y value (mm) of the lower left corner of the pixel
JMXi-PSIZ-MOD	Gives size of each pixel (cm )
JMXi-PRED-MOD	Is the pixel redistribution description from the raw pixels on a regular pixel grid
Data Structures used for Dead Time derivation
JMXi-DEAD-MOD	Contains the dead time model for the read time for different events for both 8MHz and 16 MHz operation of the on-board CPU. TRIGGERS lists the event counter ID number from the on-board software and DEAD8_1 and DEAD16_1 give the time in seconds to do the read in. The usual on-board CPU speed is 16 MHz. Also contains a keyword for the double trigger effect.
Data Structures used for background handling
JMXi-DBKG-MOD	Contains maps giving the spatial distribution of background counts at a number of energy levels including information about detector areas that should nopt be used.
Data Structure used for imaging and source finding
JMXi-COLL-MOD	Contains a collimator description in the form of two lists of the coordinates of the collimator lamellae intersections. X- and Y-coordinates of intersection at the top and at the bottom are given in columns XSECTBOT, YSECTBOT, XSECTTOP, and YSECTTOP.
JMXi-MASK-MOD	Contains the mask description of JEM-Xi. It is 2D table with axes along Mask X- and Y -axes.
JMXi-OPNC-MOD	Gives the coordinates (mm) of the centers of the open holes in the mask
JMXi-VIGN-MOD	Contains an array with vignetting factors for the JEM-Xi instrument. It is a 2D table with axes along X and Y-axes. This has been used to correct source intensities for collimator shadowing but is now obsolete.
JMXi-IROS-MOD	Contains some basic parameters for the component: j_ima_iros
Data Structure used for spectral analysis
JMXi-ENRG-MOD	Contains the table of ENERG_LO (lower limit of channel in keV) and ENERG_HI (upper limit of channel in keV) to be used in conjunction with E_MIN and E_MAX as found in JMXi-FBDS-MOD, JMXi-RBDS-MOD or JMXi-SBDS-MOD for the spectral response matrix.

For full description of these and other data structures see the ISDC webpage.