Table 10: HRMA/LETG/ ACIS
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Test Name, Description and Accuracy Requirement (  1 
)
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Justification
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Off-axis angles
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Focal Location
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T, °C
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Energy Sampling Interval ( E)
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Estimated Integration Time
|
Detector
|
8.
8.1 Focus
|
|
Flapper test
|
|
on-axis
|
2
|
nom.
|
Al IV 131A
|
8.1.1
3 hr
|
ACIS-G, BND(FPCs, SSS), FMS
|
|
Repeat for ACIS-I
|
|
8.1.2
3 hr
|
ACIS-I, BND(FPCs, SSS), FMS
|
|
|
|
|
|
|
|
Subtotal: 6 hr
|
|
|
8.2 HRMA/LETG/ACIS Resolution, PSFa
|
|
On-axis energy response
|
|
on-axis
|
|
nominal
|
Al K
|
8.2.1
3000x3 = 1.4 hr
|
ACIS-G, BND(FPCs, SSS), FMS
|
|
|
|
8.2.2
1.4 hr
|
ACIS-I, BND(FPCs, SSS), FMS
|
|
|
|
|
|
|
|
Subtotal: 2.8 hr
|
|
8.3 Absolute wavelength determination & Absolute efficiency
|
|
On-axis energy response, absolute efficiency
Accuracy 0.02 A., 10% effic.
|
|
on-axis
|
0
|
nominal
|
C K + mono., Al K, Fe K, Cr-K,
|
8.3.1
4000x4+3x900= 5.2 hr
|
ACIS-G, BND(FPCs, SSS), FMS
|
|
|
|
8.3.2
5.2 hr
|
ACIS-I, BND(FPCs, SSS), FMS
|
|
|
|
|
|
|
|
Subtotal: 10.4 hr
|
|
8.4 Relative Efficiency
|
|
Accuracy 2%. Includes separation of higher orders by pulse height analysis.
|
|
on-axis
|
0
|
nominal
|
13 energies: C K, Ti L, O K, Cu L, Al K, Si K, Zr L, Ag L, Sn L, Ti K, Cr K, Fe K, Cu K, +continuum
|
8.4.1
400x13+12x900 = 4.4 hr
|
ACIS-G, BND(FPCs, SSS), FMS
|
|
|
8.4.2
4.4 hr
|
ACIS-I, BND(FPCs, SSS), FMS
|
|
|
|
|
|
|
|
Subtotal: 8.8 hr
|
|
8.5 Total Integration Time for LETG/ACIS
|
1.2 days
|
|