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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 |
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The three Lakeshores will be set up the same, with sensors placed at (or within) the vacuum chamber.
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Installation Details
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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.
| View file | ||
|---|---|---|
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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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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
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Parameter
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Threshold
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Notes
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and Sensor Locations
Installation details and sensor locations for all three Lakeshores are listed here: Thermal Sensor Locations (Spectrometer and Hallway)
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Relevant Datasheets & Manuals
Description | File | Source | |||||
|---|---|---|---|---|---|---|---|
| 1 | Device Manual |
| |||||
| 2 | Rack Mounting Instructions |
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Relevant Software
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Description
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File
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Source
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Python code that sets up a Lakeshore 224 with KPF settings.
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| View file | ||
|---|---|---|
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Written by S. Gibson for tests at SSL.
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Dispatcher Implementation
Currently this is part of the kpfmet service. That service has multiple dispatchers, each is noted by a dispatcher number or $(DISPNUM)
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 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.
Configuration File
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.
Configuration
Value
Explanation
address
192.168.23.181
IP address of the Lakeshore
port
7777
port for connecting to the Lakeshore
poll_time
5
Time in seconds between queries
model
MODEL224
Model number for the device, must in the return string when the model is queried
name
green
Prefix of name, corresponds to which Lakeshore (could be removed)
dispnum
2
Dispatcher number.
name
sensor
Name of the sensor, must be in a block labeled by the internal sensor name (e.g., A, B, C2, etc.)
type
double
The data type of the value
format
%.3f
The ASCII format used for showing the data via KTL. The full data as returned by the device will be stored in the binary format.
unit
deg C