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chara:files:mircx_alignlab [2018/07/05 09:17] jones |
chara:files:mircx_alignlab [2020/07/10 15:42] (current) gail_stargazer |
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====== Lab Alignment ====== | ====== Lab Alignment ====== | ||
+ | **NOTE:** These instructions are based on OLD python based GUIs. | ||
- | 1. After the daytime staff have aligned the vis/IR dichroics and IR Mirrors to the MIRCx table, you can begin the lab alignment of MIRCx. | + | 1. After the daytime staff have aligned the vis/IR dichroics and IR Mirrors to the MIRCx table, you can begin the lab alignment of MIRCx. This should be done at the start of a MIRCx run or whenever one of the MIRCx pickoff mirrors are taken out of the beam. Make sure the CHARA corner cubes are in all of the beams. |
- | 2. Confirm that the MIRCx pickoff mirrors are on the kinematic mounts. | + | 2. Confirm that the MIRCx pickoff mirrors are on the kinematic mounts. Also make sure that the IR alignment target on the edge of the MIRCx table is out of the beam. Take off the lens cover on the MIRCx camera. |
3. Turn on the white light source (POS 4). | 3. Turn on the white light source (POS 4). | ||
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5. Follow the instructions in the MIRCx User Manual to start the camera (Gain 5), take backgrounds, | 5. Follow the instructions in the MIRCx User Manual to start the camera (Gain 5), take backgrounds, | ||
- | 6. Open B1-6, IR1-6, and WL shutters. | + | 6. Open B1-6, IR1-6, and WL shutters. Select visbeams 1&2, 3&4, or 5&6. |
- | 7. On Fiber Explorer, go to the "Fiber Mapping" | + | 7. On Fiber Explorer, go to the "Fiber Mapping" |
- | If you find the light on one or more beams, then click "Move to max" or "Move to Gauss peak" for the beams that have light. | + | If you find the light on one or more beams, then click "Move to max" or "Move to Gauss peak" for the beams that have light. Do not be too alarmed if the light does not show up after moving the fiber - the 8 um step size is not too sensitive for proper centering. After moving the fibers, do a finer search using num_steps of 9 at a step size of 2-4 um to center the fibers better. |
- | If you do not find the light, you might want to use a larger number of steps (like ~ 25 or so).\\ | + | If you do not find the light, you might want to use a larger number of steps (like ~ 25 or so). |
- | If you see light on the detector while searching, but not in the fiber maps, then this means that the xchan positions are not set correctly. | + | If you see light on the detector while searching, but not in the fiber maps, then this means that the xchan positions are not set correctly. Try closing all but one shutter and search for light on only one beam at a time using the " |
- | Also try looking for light on a different visbeams pair, just to confirm whether there is light coming through at all. If not you don't see light on any beam, then check to make sure all the shutters are open and do a visual check in the lab to make sure corner cubes are in and no targets are blocking the beam path.\\ | + | Also try looking for light on a different visbeams pair, just to confirm whether there is light coming through at all. If not you don't see light on any beam, then check to make sure all the shutters are open and do a visual check in the lab to make sure corner cubes are in and no targets are blocking the beam path. |
+ | |||
+ | If you do not find light on a particular beam (but confirm that light is getting though to the other beams), you can try searching the entire range of the fiber mount. To do this, go to the Luminos Stage tab on Fiber Explorer. Select the relevant beam from the pull down menu. Write down the current x, y, z positions. Set the x,y position to the center of the range (64,000, 64,000) and click "Move to" button (full range goes from 0 to 128,000). Do not change the Z focus position. Then go to the Fiber Mapping tab and set the search range to the full range to num_steps = 64 at 8 micron step sizes. This search will take a very long time. If there is still no light, then a careful check has to be done by eye using the laser on the MIRCx table - EXPERTS ONLY - do not move any optics if you are not certain what they do. Contact the MIRCx team for advice. | ||
+ | |||
+ | 8. The last step is to record the counts ("Get Intensity" | ||
- | If you do not find light on a particular beam (but confirm that light is getting though to the other beams), you can try searching the entire range of the fiber mount. To do this, go to the Luminos Stage tab on Fiber Explorer. | ||
- | 8. The last step is to record the counts ("Get Intensity" |