[Artist's Concept of AXAF-I] AXAF Project Science: DCM Spot Size

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Here are the images of DCM spot measurements from the XRCF. For these measurements, the background rates are very high; normal background rates are < 0.5 evts/sec. This problem had been occuring with the HRI MCP for several weeks, and wasn't corrected until about a week later when Murray and Chappell brought a new MCP from SAO and installed it.

There were "anti-gaps" in the raw images likely due to incorrect gain settings for the preamps. To create a gap map for these data, all the background images from May 14 and May 15 were added together and the gaps adjusted to make the resulting image smooth. The gap parameters were not constrained and this allows a simple correction to be made for the antigaps. The resulting gap file was called bk96may.gap.

The HRIFIT screen output was changed slightly. It now always reports the number of "overflow" events. This was done to see if overflow events accounted for a large part of the background (they don't). There were no other changes to the software and the output FITS files should not have changed.

The overlay grid has a spacing of 500 microns (0.5 mm). The GIF images only show part of the total FITS image.

Magnification     = 1.06 +/- 0.01
Data taken        = 1996-05-13/1996-05-15
Pinhole size      = 40 micron

VHRIFIT           = 1999-03-01
GAPFIL            = bk96may.gap
VLEXTRCT          = 1999-01-20
To get a compressed tar file of all the FITS images in this sequence click here: FITS data.
Crystal/energy Source Bias Beam Filament Exposure Thumbnail GIF
(kV) (V) (mA) (A) (sec)
Ge/8.3976 24 0 90 1.0 300 *
background 0 0 0 0 300 *
background 0 0 0 0 900 *
Ge/8.3976 24 0 90 1.0 300 *
Ge/8.3976 20 0 90 1.02 300 *
Ge/8.3976 20 860 90 1.18 300 *
Ge/8.3976 20 1000 78 1.14 300 *
Ge/8.3976 20 1000 60 1.03 600 *
Ge/8.3976 24 1200 60 1.02 600 *
background 0 0 0 0 900 *
background 0 0 0 0 5000 *
Ge/8.3976 24 1200 90 1.08 300 *
Ge/8.3976 24 960 90 1.05 300 *
Ge/8.3976 24 720 90 1.02 300 *
Ge/8.3976 24 480 90 1.02 300 *
Ge/8.3976 20 800 90 1.13 300 *
Ge/8.3976 20 600 90 1.05 300 *
Ge/8.3976 20 400 90 1.02 300 *
background 0 0 0 0 5000 *
TAP/1.7754 24 0 90 1.01 300 *
TAP/1.7754 20 800 90 1.15 600 *
background 0 0 0 0 5000 *
background 0 0 0 0 5000 *
TAP/1.7754 20 800 90 1.1 300 *
aSi/8.3976 24 0 90 1.1 300 *
aSi/8.3976 24 0 90 1.1 300 *
aSi/8.3976 24 0 90 1.1 300 *
aSi/8.3976 20 800 87 1.12 300 *
aSi/8.3976 24 0 90 1.0 300 *
aSi/8.3976 20 800 87 1.12 300 *
background 0 0 0 0 5000 *
Ge/8.3976 24 1368 90 1.16 300 *
Ge/8.3976 24 1200 90 1.08 300 *
Ge/8.3976 24 1440 84 1.15 300 *
Ge/8.3976 24 1680 69 1.15 300 *
Ge/8.0 24 1200 90 1.08 300 *
Ge/8.0 24 1200 90 1.08 900 *
Ge/8.0 24 1200 90 1.08 900 *
Ge/8.3976 24 1200 90 1.08 300 *
Ge/8.3976 24 1200 90 1.08 600 *
Ge/8.0 24 1200 90 1.08 600 *
Ge/8.0 24 1200 90 1.08 600 *
Ge/8.39376 24 1200 90 1.08 600 *
background 0 0 0 0 1800 *
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