This page (revision-3) was last changed on 07-Dec-2016 14:14 by PeterYoung

This page was created on 05-Jul-2007 17:18 by PeterYoung

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Version Date Modified Size Author Changes ... Change note
3 07-Dec-2016 14:14 2 KB PeterYoung to previous
2 09-Oct-2008 16:44 1 KB PeterYoung to previous | to last
1 05-Jul-2007 17:18 931 bytes PeterYoung to last

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At line 1 added 2 lines
!!Spatial offsets between the two CCDs in the X direction
At line 13 added 10 lines
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!Update
In order to reduce the X-offset between the detectors, tests were performed to see if moving the slit position would improve the situation. The EIS slit assembly has a "paddle-wheel" design (note: not to be confused with a "windmill" design), with four paddles that contain the slits. Normally the paddle-wheel is rotated through 90 degrees to bring the different slits into the beam. The paddle wheel can also be moved by small amounts (a fraction of a degree) and this is what the tests did.
After inspecting various data-sets, an optimum position for the slit assembly was found and a permanent change was made on __24 August 2008__. Preliminary checks on the data suggest that the spatial offset between the two CCDs is now around 0.5 arcsec.
If you have made any measurements of the offset since 24 August 2008 and find a different value, please report it here.
This page (revision-3) was last changed on 07-Dec-2016 14:14 by PeterYoungTop