Taking High Speed CWFS Data for Image Quality Measurements

Part of the Image Quality Improvement Project at the Hobby-Eberly Telescope will include the use of a high speed CWFS imaging to measure seeing in sub-apertures

1. Select a 6-7th magnitude star (i.e., from the bsc5 catalog) and run shuffle on it with IFU=000 (the IHMP). Choose a star which transits about 20 minutes from when you start the test.

target_setup -cat bsc5 983 W -ifu 000 -to

2. Make sure the DIMM is running the whole time.

3. Make sure that CWFS is powered up (you may need to restart PAS (and start/stop images in TCS GUI))

4. Get on this trajectory with "go_next". Ask the TO to setup on the IHMP position from wiki (handshake from ACQ to a guider).

5. Activate a WFS.

6. Remove the ACQ mirror

7. Insert the CWFS mirror syscmd -P 'DeployCWFSCameraMirror()'

8. Be sure that the "processing" checkbox is enabled on the CWFS GUI.

9. offset from IHMP to CWFS with syscmd -T 'offset_trajectory(dx_ang=-5.1, dy_ang=-3.9, adjust_probes="true")'

10. Look at CWFS x and y offsets and refine the offset above with any residuals until offsets less than 0.3".

11. Once that looks good, run this command to allow VimbaViewer to take control of the CWFS:

syscmd -p 'CWFS_RelinquishControl()'

12. Start the VimbaViewer by running: vimbaviewer (aliased to /home/het/rbryant/Vimba/Vimba_2_1/Tools/Viewer/Bin/x86_64bit/VimbaViewer)

13. The first window that starts up is the camera select window. Click the check box next to the CWFS camera. Do not exit the Camera Select Window or the Camera Control Window (which pops up when you click the check box) will also exit.

14. Set the exposure time to 10,000 to 20,000 micro-seconds. In the ROI tab, change binning to 4x4 and ROIS to offsety= TBC

15. If you are happy with this star, then set the parameters for an image series by selecting File->Image Series Options... from the File menu. You may have to create the directory in the night's directory.

Format = .tiff

Name = YYYYMMDD_HHmm where YYYYMMDD_HHmm are year, month, day, hours, and minutes), ... for each image series that night

Destination Path = /hetdata/data/ImageQuality/YYYYmmdd/CWFS

Number of Images = 3000

If you want to test your exposure level, set the number of images to 1 and take a set. You can directly view this image with ds9 -photo image.tiff.

16. Run this image series (taking 3000 images should take about N minutes), and the speed should be around 40-50 FPS (fast enough).

17. Wait 2 minutes and repeat step 15 and 16 (with new names) until you have taken a total of 5 sets of images (each with their YYYMMDD_HHmm time stamp name).

18. Create a text file:

/hetdata/data/ImageQuality/YYYYmmdd/CWFS/YYYYmmdd_data.txt

and record the start/stop time of each set. Also record the wind speed, wind direction, telescope azimuth, louvre state, and the camera data rate (FPS) as shown at the bottom of the camera control window.

19. When these sets are completed, you can cancel the trajectory and move on your night. To return the CWFS to its normal state, click the "X"s in the top right corner of the Camera Control Window and the Camera Select Window. Then give control of the CWFS back to PAS/PFIP with:

syscmd -p 'CWFS_TakeControl()'

20. Power off the CWFS camera and retract the CWFS mirror syscmd -P 'RetractCWFSCameraMirror()'

21. Email Hanshin ( lee@… ) to let him know that you have done this test.