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Description

Calibration Access and Data Handbook


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Description

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 up previous contents
Next: Generation from Ground Calibration Up: EMOS_QUANTUMEFF Previous: EMOS_QUANTUMEFF   Contents
Michael Smith 2011-09-20