Changes
/* Instrument Description */
Below is the image showing the new SHOC system mounted to the side of SpUpNIC's acquisition box. The new SHOC system replaces the old guider box that use to migrate between SpUpNIC and HiPPo. The new SHOC system is incorporated into a newly designed off-axis "pick-off" style guider system that can accommodate a filter wheel unit and SHOC camera behind the guider.
To select between the primary instrument and SHOC, a user can actuate the fold mirror in/out of the beam to steer direct the science beam towards the desired instrument (see figure below for button on TCS that actuates the fold mirror). When the fold mirror is IN beam and the guider's XY stages are "centred" then the guider camera is also functions as a "target acquisition" camera for SpUpNIC/HiPPo, similar to the old system. Also, as in the old system , the guider can patrol the area of the large annulas mirror to acquire an appropriate guide star.
NB. Because the fold mirror and annulas guide mirror are displaced relative to one another in the optical z-axis the guide/acquisition camera's focus has to be adjusted substantially when switching between guiding and target-acquiring mode. This cheat-sheet provides guidelines for focus settings and summarises instructions how to set up target-acquisition and guiding for the primary and secondary instrument: [https://docs.google.com/document/d/1lcwk0bJi393BTLG7yscAMS0l4lCA6JHsOp3g3hbeSOg/edit?usp=sharing cheat-sheet].
