Table of Contents:
Introduction
The Laser Frequency Comb (LFC) is a ‘black box’ system purchased from Menlo Systems. It provided a high-line density calibration source for KPF that offers high wavelength stability,
Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Menlo Laser Frequency Comb | |||
Relevant Functional Block Diagram
Note the LFC computer will sit on the Keck ‘ops’ network at the summit, not the KPF private network.
Software Actions
Action | Notes | |
|---|---|---|
| 1 | Turn LFC On and Off | - |
Note: No KPF software actions required. That is, we don’t need to control the comb, only get telemetry values from it.
Required Adjustable Settings
Setting | When Needed | Notes | ||
|---|---|---|---|---|
Build | Observing | Maintenance | ||
Not Applicable | Comb settings are set and maintained by manufacturer. | |||
Required Telemetry
Will/Brad: this is the telemetry list from the LFC that NEID puts into their FITS headers. We’re planning to use the same list. However, I’m not sure how well these descriptions line up with how Menlo describes the same parameters. I presume it’s similar but flagging that here in case the two are different.
Parameter | Example Values (from NEID) | NEID FITS Keywords (for reference) | Report Frequency | Purpose | Notes | |
|---|---|---|---|---|---|---|
| 1 | LFC PCF Serial Number | VIS0002 | LFCPCFSN | PCF could be changed out at some point, this records which one was installed when | ||
| 2 | LFC PCF Runtime (s) | 1590962+ | LFCPCFRT | PCF has limited lifetime | ||
| 3 | LFC Fiberlock IR Intensity | 1332 | LFCFLIR | |||
| 4 | LFC Fiberlock VIS Intensity | -36 | LFCFLVIS | |||
| 5 | LFC Filtered Offset Freq (Hz) | 4954999997.833 | LFCF0 | |||
| 6 | LFC Filtered Offset Freq Ref (Hz) | 4955000000.000 | LFCF0REF | |||
| 7 | LFC Filtered Rep Rate (Hz) | 20000000000.000 | LFCFR | |||
| 8 | LFC Filtered Rep Rate Ref (Hz) | 20000000000.000 | LFCFRREF | |||
| 9 | LFC Status Bitfield | LFCSTAT |
Required Alarms
Parameter | Threshold | Notes | |
|---|---|---|---|
| 1 | |||
| 2 |
Relevant Datasheets & Manuals
Description | File | Source | |
|---|---|---|---|
| 1 | ClientAPI.zip: documentation of and client libraries for the remoting interface of the system. The documentation is system-agnostic, describing the data-format and some of the general data structures you will encounter. The client libraries are for Python, JavaScript, C++ and C# users, each with a small bare-bones example of reading values. | Email from Tilo Steinmetz at Meno (email text at left) | |
| 2 | API-Docs.zip: documentation of many of the classes exposed through the API. Frankly, this documentation is still pretty erratic: some parts are not documented at all while other parts still contain internals in the user-documentation. But once you have established connection to the system, this is still the best source available for details of the objects tree you see through the API | Email from Tilo Steinmetz at Meno (email text at left) | |
| 3 | menlosystemcore_with_plugins-1.7.0-installer.exe, coreui-2.5.0-installer.exe and systemlogic.zip: releases of the PC-version of the main application and the GUI component, to allow you to install on any of your (Windows-)PCs and get them to pretend to be an LFC. Useful for testing before the actual system gets shipped. Please note: we expect to have one more bugfix release of the software and to do lots of editing of the systemlogic (which is a high-level, scriptable configuration of the system). The bugfix release is needed because the GUI still crashes sometimes during startup and the systemlogic as attached still needs some work: a few elements GUI pages are not working and the automation is still missing | Email from Tilo Steinmetz at Meno (email text at left) | |
| 4 | |||
| 5 | OUTDATED Fiber Comb Control software User Manual | From NEID Menlo comb | |
| 6 | OUTDATED Software Interface Control Document for XLMRPC-protocol | From NEID Menlo comb |
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