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Table of Contents:
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Three Lakeshore controllers are used for high precision temperature telemetry within KPF.A summary of the sensor locations is given on this Google Sheet.
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Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Green Lakeshore | 1 | Lakeshore | 224-12 |
Red Lakeshore | 1 | Lakeshore | 224-12 |
Spectrometer Lakeshore | 1 | Lakeshore | 224-12 |
RTD Sensors | 36 | Honeywell | Honeywell PN: HRTS-5760-B-U-1-12 |
NOTE: we have three identical devices. The only difference in the control software between the two will be the look-up table which maps the Lakeshore sensor input names (i.e. ‘C1’) to physical sensor locations within KPF (i.e. ‘Echelle’).same KTL dispatcher is used for all three, however each device has a its own configuration file as described within the “Dispatcher Configuration File” section below.
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Relevant Functional Block Diagram
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The three Lakeshores will be set up the same, with sensors placed at within (or withinaround) the vacuum chamber.
Installation Details
The connectors on the various Lakeshore cable harnesses are labelled 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
This diagram indicates how they connect to the Lakeshore rear panel:
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Software Actions
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Action
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Notes
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Read 12 temperature values
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Values reported as telemetry (see below)
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Required Adjustable Settings
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Setting
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When Needed
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Notes
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Build
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Observing
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Maintenance
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Temperature measurement frequency
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Yes
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No
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Maybe
Device Set-up Parameters
Annotated command list with KPF settings.The temperature sensor cable details differ depending on where the sensors are placed, see “Installation Details and Sensor Locations” table below for more details.
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Installation Details and Sensor Locations
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Input B Temperature [deg C]
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Input C1 Temperature [deg C]
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Input C2 Temperature [deg C]
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Input C3 Temperature [deg C]
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Input C4 Temperature [deg C]
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Input C5 Temperature [deg C]
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Input D1 Temperature [deg C]
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Input D2 Temperature [deg C]
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Input D3 Temperature [deg C]
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Input D4 Temperature [deg C]
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Input D5 Temperature [deg C]
Lakeshore Input Names/KPF Location Look-up Tables
Green Lakeshore
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Lakeshore Input
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KPF Location
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Notes
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A
Green Cryostat
Individual Locations TBD
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B
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C1
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C2
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C3
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C4
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C5
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D1
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D2
Spectrometer
Individual Locations TBD
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D3
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D4
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D5
Red Lakeshore
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Lakeshore Input
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KPF Location
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Notes
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A
Red Cryostat
Individual Locations TBD
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B
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C1
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C2
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C3
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C4
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C5
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D1
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D2
Spectrometer
Individual Locations TBD
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D3
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D4
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D5
Spectrometer Lakeshore
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Lakeshore Input
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KPF Location
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Notes
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A
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B
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C1
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C2
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C3
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C4
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C5
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D1
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D2
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D3
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D4
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D5
Required Alarms
Parameter
Threshold
Notes
Description | File | Notes | |||
|---|---|---|---|---|---|
| 1 | Installation details and sensor locations | ||||
| 2 | Interconnection Diagram |  | |||
| 3 | Sensor cable harness fabrication details |
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Required Telemetry
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Parameter
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Report Frequency
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Purpose
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Notes
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Input A Temperature [deg C]
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Once every 5 sec [TBC]
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Environmental monitoring
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| 4 | Cable details between Lakeshores and vacuum chamber | ||
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Relevant Datasheets & Manuals
Description
File
Source
Python code that sets up a Lakeshore 224 with KPF settings.
Description | File | Source | |||||
|---|---|---|---|---|---|---|---|
| 1 | Device Manual |
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| 2 | Rack Mounting Instructions |
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Relevant Software
| 3 | RTD Sensor Datasheet |
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Written by S. Gibson for tests at SSL.
Dispatcher Implementation
Currently this is part of the kpfmet service. That service has multiple dispatchers, each is noted by a dispatcher number or $(DISPNUM)
Covers many sensors, the part number of the sensor KPF uses is: HRTS-5760-B-U-1-12. | DigiKey download. |
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Dispatcher Configuration File
Each Lakeshore has a unique name, noted as $(NAME). Currently the names are green and red but that can easily change. That name is used to denote details about the connections.
Finally, each Each sensor has a unique name, noted as $(sensor). That name is set by the configuration file. The keyword for the sensor is set by the sensor name. The units, data type, and display format are also all defined in the configuration file.
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Keyword
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Value
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Type
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$(NAME)_SERIAL
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LSA2BFB/OCD2BFB/OCC2BFB
Serial number of device read at connection.
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String - read only
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$(NAME)_REV
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1.2
Version of device, read at connection
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String - read only
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$(sensor_name)
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-273.15
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Read only value from the sensor. The type, units, and format is determined by the configuration file (see below)
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DISP$(DISPNUM)STA
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0 - Ready
1 - Initializing
2 - Shutting down
3 - Connecting
4 - Not connected
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Read only enumerated list gives status of the dispatcher. Ready means connected to the device. Initializing occurs at start up, shutting down when exiting, connecting when connecting and not connected when the connection to the Lakeshore is lost.
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DISP$(DISPNUM)STOP
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0 - Go
1 - Stop
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Boolean that is writable, 1 means that the dispatcher exits.
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DISP$(DISPNUM)CONN
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IP address and port separated by colon
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Read only string set in configuration file.
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DISP$(DISPNUM)DEV
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Device name
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Read only string set in configuration file.
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Other DISP keywords
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last request, memory, clock, message and error
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The standard dispatcher keywords.
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Note, beyond the blocks device and dispatcher each sensor needs its own block. That block named by the sensor name, so, A, B, C1, etc.
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