Table 1: Calibration Instrument Requirements Summary
|
Calibration Test
|
VETA-I Test
|
AXAF Preflight Calibration
|
|
Accuracy
Requirement
|
Detectors
used
|
Monitors used
|
Accuracy
Requirement
|
Additional Instrument Required
|
Additional Monitors required
|
|
Type
|
Reason
|
Type
|
Reason
|
|
FWHM
|
0.05
arcsec
|
1 small flow, proportional counter pinhole scanner.
|
1 small flow, 1 small sealed
proportional counters @
VETA-I
|
same as VETA-I
|
.....................................................
|
|
Encircled Energy
|
2%, 5 E's
0.27 - 2 keV
|
1%, 30 E's, 0.1-10 keV
|
SSS, stable, fast x-ray source
|
high-energy
continuum subtration, speed, accuracy
|
~3 more medium flow proportional counters. SSS
|
beam spatial, temporal & spectral uniformity
|
|
Mirror
Effective
Area
|
5%, 5 E's
0.27 - 2 keV
|
1%, 30 E's, 0.1-10 keV
|
|
1%
E/
E = 103,
0.1-10 keV
|
Synchrotron, mono., reflectometer
|
monochromatic beam
|
(small flow proportional counters, pin diodes)
|
beam temporal uniformity
|
|
Grating
efficiency
|
.....................................................
|
2%,E/
E = 2000,
0.1-10 keV
|
|
HRMA PRF details
( A/A)
|
.....................................................
|
inner:
0.5%, intermed.: 2%
|
HSI, small x-ray spot
|
speed: 2 yrs -> 5 mo.
|
(~3 more medium flow proportional counters)
|
beam spatial & temporal uniformity
|
|
.....................................................
|
MONO: 0.1-10
|
eliminate continuum
|
|
.....................................................
|
outer:
15% over 30 mm field, (A/A)
|
HRC
|
speed (solid angle)
|
|
.....................................................
|
MONO
|
eliminate continuum
|
|
Grating
Energy
Resolution
( FWHM/FWHM)
|
.....................................................
|
LETG:
2%,.095-7 keV
|
Penning source
|
narrow 0.095 keV line
|
|
.....................................................
|
HEG:
2%
|
SSS
|
|
|
|
|
.....................................................
|
MEG:
2%,0.4-7 keV
|
MONO:0.4-1.0
|
narrow 0.4 keV line
|
|
|
|
Grating PRF wings
|
.....................................................
|
1%
(of peak)
|
SSS
|
high-energy
continuum subtraction
|
SSS
|
beam spectral uniformity
|
|
HRMA ghost images
|
.....................................................
|
.......................................
|
HRC
|
rapid detection @ high sensitivity
|
3 more flow ...
|
spatial, spectral
|
|
Structure
fluorescence
|
.....................................................
|
look for features from deposits, obstructions
|
(Flight gratings)
|
will show up as spectral features
|
|
|