Changes
*(5) Think about optimal slit size — 1.5” min, could be up to 2”, could also consider stepped slit — these are laser cut, and we could request more than one (Amanda & Hannah)
*(6) Thinking about .fits header information for compatibility with data reduction pipeline, and how to integrate TCS with instrument to allow automated acquisition (Carel)
== Notes from meeting on 1st Feb 2019 ==
Combined Sprat/SHOC is way to go.
Working out from Nasmyth:
* "Inside" Nasymyth is autoguider. This can patrol half of the field of view, and will hopefully have a focus mechanism.
* Nasmyth mounting plate will have:
** James to provide details of this mounting as used on Wide Field Camera on opposite port.
** 1/4 of the field of view will be for a High Resolution Spectrograph (HRS) fibre feed
** 1/4 of the field of view with be for SPRAT/SHOC
** A cable wrap (copy of that on opposite port) will be provided. James to provide details.
** There is possibility of pneumatic supply
* Deployable calibration mirror (to feed flat/arc)
* Deployable slit
* Field Lens
* Collimator Lens
* FILTER SLIDES (3). Hopefully <50mm thickness. To house maybe 5 filters each. Note one filter will need to be order blocker (4000-8000 Angstroms) for SPRAT. James to design to fit to an interface in SPRAT.
* Grism Assembly
* Camera Lens and CCD.
General Design Points
* Filter slides need to be in collimated beam to avoid focus shifts
* Try and minimise cables on/off mount. So mount control computer with instrument. Note SHOC software requires GPS feed (serial?).
* USB for camera rather than PCI Card
* Use existing SHOC CCD readout (via andor SDK)
* Use existing Apache Thrift infrastructure
* LJMU responsible for all mechanism control, including filter slides
* Use wiki to keep one version of documentation/files etc.
Actions:
* IAS: Check/modify optical design to make space for filter slides
* James: Provide details of mounting plate/wider field camera (STEP File)
* Carel: Provide details of SHOC software to Chris Mottram so he can try and built a local copy at LJMU
* Amanda: Look at trade off between deep depletion (higher red QE, higher dark current) and standard EMCCD
== SHOC/SPRAT hybrid ==
