Calibration Access and Data Handbook
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Tables with energy-/position- and pattern-dependent quantum efficiencies; CCD number
s encoded in the table name; pattern number is encoded in column name (QE_0,
QE_1, etc.); position information is given in column REGION
Keywords to describe the contents of the CCF:
The CCF contains the following tables:
- QE_CCDn:
- The quantum efficiency (QE) of the MOS detectors is given, per CCD, in
the extensions QE_CCDn (where n=1 (central CCD) to 7). It is described as
a function of event pattern type in columns QE_nn (where nn=0, single pixel events, - 31).
The energy grid for these arrays in given in the extension EBINS.
These extensions also hold keywords to describe the ratio of the
events which have patterns 13-25 to those which have larger pattern
numbers (available as MISCDATA). Keywords are also present which allow the average size of
the large patterns to be calculated as a function of photon energy.
- Attributes:
-
- LRG_1325:
- Ratio of large events to Pattern 13-25 events
- LRG_SIZ0:
- Coefficient 0 for calculation of average large pattern size
- LRG_SIZ1:
- Coefficient 1
- LRG_SIZ2:
- Coefficient 2
- LRG_SIZ3:
- Coefficient 3
- LRG_SIZ4:
- Coefficient 4
- Columns:
-
- REGION:
- A spatial region to allow intra-chip QE to be expressed.
- QE_nn:
- The QE per pattern.
- EBINS:
- The energy grid for the QE_CCDn arrays.
- Attributes:
- None.
- Columns:
-
- ENERGY:
- Photon energy (eV).
- QE_TOTAL:
- The total QE as a function of energy.
- Attributes:
- None.
- Columns:
-
- QE_TOTAL:
- Total QE.
- FRACTION_CHANNEL
- The fraction of the total QE which is contained in single,
double, triple or quadruple pixel events, as a function of the channels
tabulated in CHBINS_FRACTION.
- Attributes:
- None.
- Columns:
-
- MODE_ID:
- The observing modes
- THRESH:
- The threshold at which events are cut-off in channels.
- REGION:
- A spatial selection
- FRAC_S:
- The fraction contained in single pixels
- FRAC_D:
- The fraction contained in double-pixel events
- FRAC_T:
- The fraction contained in triples
- FRAC_Q:
- The fraction contained in quadruple-pixel events
- FRAC_SD:
- The fraction contained in single+double pixel events
- FRAC_SDTQ:
- The fraction contained in single+double+triple+quads
- FRACTION_ENERGY
- The fraction of the total QE which is contained in single,
double, triple or quadruple pixel events, as a function of the energies
tabulated in EBINS_FRACTION.
The effective area file generator, arfgen, calculates the detector QE
by multiplying QE_TOTAL by FRACTION_ENERGY.
- Attributes:
- None.
- Columns:
-
- MODE_ID:
- The observing modes
- THRESH:
- The threshold at which events are cut-off in channels.
- REGION:
- A spatial selection
- FRAC_S:
- The fraction contained in single pixels in energy space
- FRAC_D:
- The fraction contained in double-pixel events
- FRAC_T:
- The fraction contained in triples
- FRAC_Q:
- The fraction contained in quadruple-pixel events
- FRAC_SD:
- The fraction contained in single+double pixel events
- FRAC_SDTQ:
- The fraction contained in single+double+triple+quads
- EBINS_FRACTION
- The energy grid for the FRACTION_ENERGY arrays.
- Attributes:
- None.
- Columns:
-
- ENERGY:
- Photon energy (eV).
- CHBINS_FRACTION
- The channel grid for the FRACTION_CHANNEL arrays.
- Attributes:
- None.
- Columns:
-
- PI_CHAN:
- PI channel number (channels).
Next: Generation from Ground Calibration
Up: EMOS_QUANTUMEFF
Previous: EMOS_QUANTUMEFF
Contents
Michael Smith
2011-09-20