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DRAFT/INCOMPLETE

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Etalon Status Update

10 Nov 2022 Based on C. Schwarb’s email on Nov 4, 2022.

•  Need update from Julian Sturmer regarding temperature controllers and etalon computer setup.
•  Set up etalon computer as a vendor-supplied machine, similar to the Menlo machine

Dwight and John V. may perform the first two tasks described below in the week of Nov 14, 2022, if they have time.

•  Backfill Dewar – backfill the etalon with Helium, at about atmospheric pressure

The Etalon is currently pumped and closed. The valve I used is the final version, and all metal seal valves can only be closed a small number of times. It has indicator marks, and every time you close it, you turn it another half indicator mark tighter than the last time. Currently, it sits on the very first mark. The manual of that valve is attached. Check pages 6 and 7. 

On the exit port of the valve, I installed a CF16 to KF40 adapter, to make it interfaceable with the rest of your stuff. There is a KF40 Tee somewhere in the basement, and I know you have more of them, and also KF40 O-ring sealed valves. I suggest adding a Tee like last time to interface to a pump and the helium bottle, and possibly one of those O-ring KF valves in front (towards etalon) of it, so you can easily close the chamber off once it's filled with He and "burped". The all-metal valve needs a bit of care to close, can't do it quickly.

•  Mount Sidewall – close the sidewall, and put it back onto the bench in an orientation that allows the cables to reach the temperature controllers

Self-explanatory, and the screws (plastic) are stuck to the panel with sticky tape.  If you can, would you put some sticky tape over the gaps in the corners all around?

•  Install Temperature Controllers – plug those cables into the vescent temperature controllers (order below)

Because Julian did not get access to the control computer until very recently, these are not tuned up, which we need to really get on. The controllers are the two Vescent units sitting side by side in the rack on the right side of the cal bench. Cables go into the back - suggest pulling one controller out and having a look at how the channels are numbered. 

The cables from the etalon are all labeled, as below. 

Vescent 1 (left one):

CH1: Etalon 10k        (10k thermistor glued into the etalon mount)

CH2: Bottom Int         (bottom of the active shield)

CH3: Shield               (tube of the active shield)

CH4: Top Int              (top of the active shield)

Vescent 2:

CH1: Passive 10k      (bottom of the passive shield)

CH2: External            (external chamber heaters, all connected)

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Etalon Rack Devices

Notes:

• For “Controlling Software” column:

  • “Etalon” = device is only controlled by software on etalon PC;

  • “KPF” = device needs to be controlled by KPF instrument control software

• For “Etalon computer”:

  • any 19” server with Linux OS (preferred: Ubuntu) with at least 4 cores. >=1TB SSD, >=2TB HDD, >=16GB RAM will work

  • redundant power supply recommended (included in table)

  • necessary interfaces (TBD): 4x USB 2.0, 2x USB 3.0

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Other Facility Services

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Relevant Functional Block Diagram

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List of etalon actions that the KPF instrument control software will need to perform (i.e. move something, read a value, measure something, etc.)

Email exchange between Julian and Will about KTL access to etalon telemetry:

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List of etalon device settings that the KPF instrument control software would need to control or change.

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Required Telemetry

List of etalon telemetry that the KPF instrument control software should monitor, save, or make available for image headers.

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Required Alarms

Etalon telemetry items that should have a KPF instrument software alarm raised when telemetry passes a threshold value.

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Relevant Datasheets & Manuals