From mweber@head.cfa.harvard.edu Wed Jun 8 04:26:58 2005 Date: Wed, 8 Jun 2005 04:26:53 -0400 (EDT) From: Mark Weber To: Jonathan Cirtain Cc: Ed Deluca , Bill Podgorski Subject: E2E 20050607B Science handoff discussion. Good morning, Jonathon Oh boy, do I have a lot to tell you. 1) I do not know where the analysis webpage directory is, so you will have to upload my webpage and images. Look in here: /data/oxygen6b/mweber/e2e/20050607B/ The permissions should be wide open. It is important that you do this right away, because people are trying to figure out what the results mean, and they need to see my plots. I expect complaints about the plots, but there is not time now to make things pretty. 2) I have done a little organizing of the Science Log Notebook. I especially tried to get my 20050607B sections filled out. Likewise with my shift directory. 3) Please look in your 20050608A section. Ed took some VLI data which he wants you to analyze first thing in the morning. Here are some specifics: - The G-Band was used for all images. - The log sheet clearly labels the darks, and which images were taken with the VLI opened or closed. Light always enters through the x-ray aperture, because the prefilters are not there. When the VLI shutter is open, then light also enters through the VLI aperture. So "open minus closed" tells you approx about the light coming through just the VLI aperture. - We want to do 2D gaussfits and "Best Focus" type analysis (for only a handful of focus positions) on the "open minus closed" images. To prepare for this, you are going to use the data we took on my shift, which is listed on the logsheet. If "one open minus one closed" does not give you enough signal with which to do the gauss fitting, then sum some images. Do not worry about the darks because you would just be cancelling them out anyway. You are supposed to see how much summing you need to do to get appreciable signals. - The J-side already did some of this work on my shift, and Ed has seen their results, so he has some expectations. I was not involved in any way, so this is all secondhand information to me. - As you know, there is a sub-test coming up where we compare the location of the VLI BF axis with the x-ray BF axis. Ed is hoping that we can do this with just visible-light data. For the "VLI closed" data, the observed light is only coming through the x-ray optic, so we can use that to establish the x-ray axis. Then, your practice earlier will let us use "open minus closed" images to establish the VL axis. We do 2D gaussfits, find centers, and take the difference. That is the ultimate motivation behind this exercise, I think. 4) On to the FOV OF sub-test. Our results were very confusing. It looks like we actually want to go towards *more positive* focus positions to find the OF. It is a good situation, because we might not need to respace the camera to achieve BF and OF. This is the reason why people will be wanting to see the plots on my webpage. It also means that we are not done doing the 1D radial scans. I have written routines to make the analysis much easier on you. If you look in my shift directory, you will see a file "fovof_radii_analysis.txt" that explains by example how I did things. I haven't had time to comment the routines, but I think the textfile should be enough for you to figure things out. Basically, you have to prepare the STC logsheet information as IDL variables, but then my procedure does the gaussian fitting for a whole radial scan at once, and writes a logfile which is like the handwritten sheets we have been keeping. Again, my textfile illustrates this, and you can refer to the files in my shift directory. I also show how to use a routine to plot the results. Feel free to modify a copy of the routine and increment the version number in the title. On a side note, you would be able to recreate my plots if Leon is really twisting your arm to prettify them. You may also proofread the textfile "fovof_fstep_estimate.txt", which explains how we predicted OF, and is a record of our prediction. I am optimistic about this textfile approach as part of our recordkeeping and procedure sharing. 5) I keep forgetting to return your travel mug to you. On a related note, I will check to see if the Lacie drive has arrived. I will pick up more notebook dividers in the morning. Leave me email if you think of other supplies to get. 6) I plan to avoid coming in early, since I am up awfully late, but feel free to call me if you need to. I think Ed is coming in around 10am. I hope I did not forget anything. I am sleepy. --Mark