Laser Frequency Comb

Table of Contents:

Relevant Devices

Description	Qty	Source	Part Number

Relevant Functional Block Diagram

Software Actions

	Action	Notes
1
2
3

Required Adjustable Settings

Setting	When Needed			Notes
	Build	Observing	Maintenance

Required Telemetry

	Parameter	Purpose
1	f_rep	Used to define comb output frequencies
2	f_0	Used to define comb output frequencies
3

Required Alarms

	Parameter	Threshold	Notes
1
2

Relevant Datasheets & Manuals

	Description	File	Source
1	XML Manual		Should be supplied by Menlo
2

Relevant Software

From Sam:

“Hi Steve,

We will need to query the LFC desktop for (at least) two pieces of telemetry -- f_rep and f_0, which fully define the output frequencies of the comb. These need to be saved in each FITS header to derive the absolute wavelength solution and also tell the act as a flag for whether or not the comb is locked. There are also a few other health-check metrics that can be stored, such as the comb lock status.

For NEID, I believe the Astrocomb computer is queried via XML to send a set of telemetry values, which the NEID server then stuffs into the FITS header of the observation. I'm not too familiar with this telemetry handoff (sorry), but there is a specific manual that we will get with the comb delivery that outlines the command protocols and query-able data products.

Is that what you were asking? I can also see if I can find the NEID LFC XML manual, if this would help give a sense of the complexity.

Sam”