Pre-Flight Gain Analysis

Last updated March 2, 1999
Other releases:
Energy Scale for ACIS Flight Devices.
Table 4.5, ACIS Calibration Report, January 15, 1999

This table lists the slope, intercept, and RMS deviation of a linear fit of the energy scale of the ACIS flight devices. Pulse height as a function of energy is fit to the relation PH(ADU) = Slope × Energy(eV) + Intercept.

CCD Quadrant A Quadrant B Quadrant C Quadrant D
Slope Intercept RMS Slope Intercept RMS Slope Intercept RMS Slope Intercept RMS
ADU/eV ADU eV ADU/eV ADU eV ADU/eV ADU eV ADU/eV ADU eV
i0 0.2636 0.81 3.75 0.2573 0.65 4.03 0.2662 0.77 3.52 0.2582 0.60 4.06
i1 0.2622 0.38 3.50 0.2559 -0.09 3.97 0.2596 0.36 4.34 0.2616 0.07 3.80
i2 0.2731 -0.98 3.10 0.2839 -1.07 3.35 0.2825 0.07 3.59 0.2745 0.43 3.67
i3 0.2582 1.19 4.68 0.2588 1.25 4.65 0.2542 1.25 4.51 0.2592 1.09 4.55
s0 0.2725 -0.12 4.69 0.2677 -0.54 3.35 0.2574 0.13 4.02 0.2565 -0.34 3.40
s1 0.2359 -22.00 14.80 0.2182 -27.07 22.37 0.2234 -24.86 20.23 0.2297 -25.33 18.84
s2 0.2602 0.03 3.75 0.2715 0.15 5.27 0.2640 -0.51 4.25 0.2692 -0.54 6.33
s3 0.2262 -17.33 11.16 0.2158 -19.88 13.99 0.2186 -19.65 13.18 0.2273 -22.80 13.66
s4 0.2328 -1.09 3.80 0.2272 -0.58 6.16 0.2301 -0.72 5.76 0.2391 -0.96 4.55
s5 0.2534 -0.16 3.09 0.2576 -0.13 3.18 0.2601 0.18 2.70 0.2114 0.46 4.32

Table also available in Postscript format and ASCII format.

The following 3 tables are taken from MIT's ACIS gain page, last updated 11/17/97.
CCD ID numbers: Average gain and offset for each CCD:
Number Chip ID
CCD 0 w203c4r
CCD 1 w193c2
CCD 2 w158c4r
CCD 3 w215c2r
CCD 4 w168c4r
CCD 5 w140c4r
CCD 6 w182c4r
CCD 7 w134c4r
CCD 8 w457c4
CCD 9 w201c3r
CCD Gain Offset
CCD 0 3.8461 -6.058
CCD 1 3.8628 -6.071
CCD 2 3.6100 -3.302
CCD 3 3.8984 -10.125
CCD 4 3.8210 3.139
CCD 5 4.4511 144.315
CCD 6 3.7756 0.282
CCD 7 4.5548 99.349
CCD 8 4.3253 2.614
CCD 9 4.1325 -0.512

Gain and offset for each node of each CCD:
CCD Node Gain
[eV/ADU]		 Offset
[eV]
CCD 0 0
1
2
3		 3.813900
3.903200
3.775000
3.892600		 -6.102000
-5.074000
-5.662000
-7.396000
CCD 1 0
1
2
3		 3.828500
3.921600
3.862500
3.838800		 -7.657000
-3.921000
-6.180000
-6.526000
CCD 2 0
1
2
3		 3.673800
3.546100
3.558700
3.661700		 -5.878000
2.128000
-2.135000
-7.323000
CCD 3 0
1
2
3		 3.886500
3.877500
3.946300
3.883500		 -10.10500
-9.306000
-7.498000
-13.59200
CCD 4 0
1
2
3		 3.695500
3.757900
3.909300
3.921600		 2.956000
4.509000
2.345000
2.745000
CCD Node Gain
[eV/ADU]		 Offset
[eV]
CCD 5 0
1
2
3		 4.275300
4.621100
4.514600
4.393600		 127.4050
161.2750
144.4690
144.1120
CCD 6 0
1
2
3		 3.859500
3.700900
3.805200
3.736900		 -0.3860000
-0.7400000
0.7610000
1.494000
CCD 7 0
1
2
3		 4.462300
4.683800
4.621000
4.452300		 91.47700
96.695500
101.6630
107.3020
CCD 8 0
1
2
3		 4.317800
4.418900
4.363000
4.201700		 3.022000
2.651000
4.363000
0.4200000
CCD 9 0
1
2
3		 3.973000
3.910800
3.872900
4.773300		 -0.7940000
-0.3910000
-0.3870000
-0.4770000

Back to the ACIS Calibration Page