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Light Leak Tests |
ACIS Light leak experiments conducted during thermal vacuum testing at Ball Aerospace, XRCF and
Lincoln Labs. These measure light leakage through the optical blocking filters and may be
used to evaluate possible filter breakage after AXAF launch. Also included are some amusing
tricks for measuring low level light leaks. |
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Radiation Damage Tests |
Radiation damage testing of CCDs was undertaken as part of the ACIS calibration effort.
In particular the effects of x-ray and 40 MeV proton damage was evaluated. As a response
to ACIS on-orbit cti degradation an investigation of low energy proton and electron
damage is underway. For amelioration techniques go here
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Screening Results |
Standard screening results for ACIS, HETE and Astro-E CCDs include noise, gain, resolution
and dark current measurements at the nominal operating conditions. Screening is done using the
CCD Lab IFM x-ray system.
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Direct CCD Coating(s) |
In an effort to eliminate the need of a fragile free-standing optical blocking filter
experiments are underway to directly deposit a filter onto the CCD. Currently we are
using N-parylene with an aluminum overcoat.
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CTI via Charge Injection |
Some work involving charge injection as a method to control and measure CTI
in radiation damaged devices. Applicable to ACIS and Astro-E
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