This page (revision-83) was last changed on 02-Feb-2017 13:19 by David R Williams

This page was created on 27-Jan-2009 03:17 by David R Williams

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82 19-Mar-2009 13:50 41 KB David R Williams to previous | to last
81 18-Mar-2009 21:12 40 KB David R Williams to previous | to last

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At line 24 added 3 lines
Another instrumental issue is the optimisation of the focus within the instrument.
Harry Warren was called on to talk about the slit and grating focus.
Google was apparently able to show that the grating focus happened in Aug 2008.
At line 28 added 9 lines
* Post-SLA manoeuvre, the slit images from each channel overlap to 0.25 arcsec. An explosive event observed would help to prove the alignment.
KFJ: Just to clarify there was an offset between the two channels, and now they appear simultaneously on the two detectors.
HPW: True. We haven't quite seen dynamic events
GAD: What about images on the same detector. Wasn't there a slight offset between Fe VIII and Fe XII.
HPW: in my analysis, the offset is pretty well taken care of with PRY's formula. Extremely well correlated once you account for that.
* Grating focus. The grating was driven back and forth to find the best focus position, and the images moved a lot, and consequently the dispersion relation constant changed a lot(!). But then we moved it back. HPW took histograms of the line width. We thought it might improve. At the new position, though, it's unchanged. At the extreme position, there was no usable data because the grating had moved the image so far away :-)
This page (revision-83) was last changed on 02-Feb-2017 13:19 by David R WilliamsTop