Measure corrections to the PMA arm and PMA leg rotation angles (theta and phi), and determine corrections to the length of the 6 lower sled struts and the 6 upper PMA struts based on the laser tracker measured coordinates of an array of reflective balls (Ball Mount Reflectors in the code), for different configurations.
3 BMR setups are supported
- BMR plate on petal mounted on the 2 Guide spikes for petal insertion
- Light weight BMR plate mounted on the tip of the red leg for petal removal
- Heavy weight BMR plate mounted on the tip of the red leg for petal removal
The code allows to choose which of the 14 degrees of freedom to adjust.
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DESI-4754 FPD Laser Track Nest Metrology
(FPD=Focal Plane aDapter, the large conic cylinder that holds the petal ring, this defines CS5 for the alignment)
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DESI-4949 FPP Laser Target Mount Metrology (FPP=Focal Plane Petal)
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DESI-6206 Red Leg tip mounting holes metrology
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DESI-6207-B Leg Laser Target Mount Metrology
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DESI-6211-B FPP Mass Dummy Endplate Metrology
- DESI-5905 Precision Alignment and Integration of DESI's Focal Plane using a Laser Tracker
- DESI-3224 addendum: Procedure for transverse card swap campaign
Single python script to simplify installation and usage on windows machine.
python PAC.py example-config.yaml
All inputs are provided in a yaml file. See for instance https://github.com/julienguy/petalalignment/blob/master/example-config.yaml .