...
Each cryostat will have two ion pumps attached. One will be operated continuously and the second will sit idle as a backup. Each pump has a dedicated controller (for a total of four in the system).
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Each ion pump is named with respect to its camera (Green /or Red) and the side of the spectrometer it is on (Echelle/Collimator). The driver here is that the name then echelle or collimator). Therefore the name gives the location of the pump (whereas labels like “Green #1” or “Red 10 o’clock” or “Green Prime” require more information to derive the position).
However: Brad - please let me know if this is too cumbersome!
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Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Ion Pump |
Controllers | 4 | Gamma1 | SPC-1-P-S-1-US110-E-S-N |
Ion |
Pumps | 4 | Gamma1 | 3SDI1V5KNN (3S TiTan) |
HV Cables [Air |
] | 4 | Gamma1 | 10K-SC10-10K (10 m) |
High Voltage Vacuum Feedthrough | 2 | Gamma1 | |
HV Cables [Vacuum] | 4 |
Custom
Gamma1 | 10K-TF3-5K (PTFE 3m long) |
1 Gamma products were ordered through Edwards Vacuum (Western-US Gamma distributor)
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Relevant Functional Block Diagram
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Cable Details
Cable |
|---|
Notes
GRN_ION_E: Read telemetry
Pressure, Voltage, Current and High Voltage Status values reported as telemetry (see below)
GRN_ION_C: Read telemetry
RED_ION_E: Read telemetry
RED_ION_C: Read telemetry
GRN_ION_E: turn pump
| Status | ||||
|---|---|---|---|---|
|
These controls should have a lock applied so they cannot be accidentally switched.
GRN_ION_E: turn pump
| Status | ||||
|---|---|---|---|---|
|
GRN_ION_C: turn pump
| Status | ||||
|---|---|---|---|---|
|
GRN_ION_C: turn pump
| Status | ||||
|---|---|---|---|---|
|
RED_ION_E: turn pump
| Status | ||||
|---|---|---|---|---|
|
RED_ION_E: turn pump
| Status | ||||
|---|---|---|---|---|
|
RED_ION_C: turn pump
| Status | ||||
|---|---|---|---|---|
|
RED_ION_C: turn pump
| Status | ||||
|---|---|---|---|---|
|
Required Adjustable Settings
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Setting
...
When Needed
...
Notes
...
Build
...
Observing
...
Maintenance
Required Telemetry
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Pump
...
Parameter
...
Report Frequency
...
Purpose
...
Notes
...
GRN_ION_E
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Pressure
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
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Voltage
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Current
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
High Voltage Status
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Ensure pump is on
...
GRN_ION_C
...
Pressure
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Voltage
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Current
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
High Voltage Status
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Ensure pump is on
...
RED_ION_E
...
Pressure
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Voltage
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Current
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
High Voltage Status
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Ensure pump is on
...
GRN_ION_C
...
Pressure
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Voltage
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
Current
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Monitor cyrostat pressure
...
High Voltage Status
...
Once per minute
| Status | ||||
|---|---|---|---|---|
|
...
Ensure pump is on
Required Alarms
Parameter
Threshold
Notes
GRN_ION_E pressure too high
| Status | ||||
|---|---|---|---|---|
|
Only one pump per cyrostat will be in operation at any time.
The alarm system would need to know which pump/controller is in operation at any time to monitor the correct pressure value.
GRN_ION_C pressure too high
| Status | ||||
|---|---|---|---|---|
|
RED_ION_E pressure too high
| Status | ||||
|---|---|---|---|---|
|
RED_ION_C pressure too high
| Status | ||||
|---|---|---|---|---|
|
GRN_ION_E high voltage off
| Status | ||||
|---|---|---|---|---|
|
GRN_ION_C high voltage off
| Status | ||||
|---|---|---|---|---|
|
RED_ION_E high voltage off
| Status | ||||
|---|---|---|---|---|
|
RED_ION_C high voltage off
| Status | ||||
|---|---|---|---|---|
|
Qty | Details | Notes | |
|---|---|---|---|
Ethernet | 4 | Cat6 Copper Ethernet Cable M-M, 6 feet long | Entirely within Aux Rack |
High Voltage [HV] | 4 | Part numbers within table and diagram above. |
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Relevant Datasheets & Manuals
Description | File | Source | |||||
|---|---|---|---|---|---|---|---|
| 1 | SPC Controller Spec Sheet |
| |||||
| 2 | SPC Controller Manual |
| |||||
| 3 | SPC ModBus Register Map |
| |||||
| 4 | Ion Pump specs |  | Screengrab of: https://www.gammavacuum.com/products/small-titan-ion-pumps/3211/3s-titan-ion-pump?number=&c=17662 |
Device Command List for KPF
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| 5 | Ion Pump Certificates of Performance (all 4 from original pumps) |
|
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| Shipped with pumps |
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Installation Instructions
Description
File
Description | File |
|---|
Source
Snippit from device manual explaining simplicity of telnet connection.
SG tested this with PuTTY and it works; simplest command to test is the device name:
| Code Block |
|---|
spc 01 |
which should return:
| Code Block |
|---|
OK 00 SPC2 |
From page 14 of “SPC Controller Manual”, posted just above.
Full command list starts on page 19 of same manual.
(Steve is annotating the command list for KPF’s needs)
Python code that Steve lifted from web, slightly modified, and found it worked!
Key part in here (I think) is the command structure; this is the 'Read Pressure' command:
| Code Block |
|---|
s.send(('spc 0B' + "\r\n").encode()) |
| View file | ||
|---|---|---|
|
https://gist.github.com/tspspi/779d96f305f719082d2db1e201856375/revisions
SPC Firmware
| View file | ||
|---|---|---|
|
SPC Labview Drivers
(likely not useful, but included for completeness' sake)
| View file | ||
|---|---|---|
|
Installation Instructions
Set IP Address | Press the ‘OK’ button to open the menu dialog:  Use the right arrow to go to the ‘Ethnt’ option:  Choose the ‘Addr’ setting:  Then:
Then go to the ‘Mask’ setting in the ‘Ethnt’ menu:  The subnet mask should be set to 255.255.255.0. Then go to the ‘Gatewy’ setting in the ‘Ethnt’ menu:  The gateway should be set to 192.168.23.1. (A gateway isn’t used by the KPF Private Network, but setting a value here just in case the device needs one). |
Enable the high-resolution mode for reporting pressures (this is a front-panel-only setting). |  |
Set IP Address |
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Dispatcher
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Configuration File
This dispatcher is part of kpfgreen (currently) and will be part of kpfred. There will be four dispatcher instances running each with a unique configuration file.
Values with $(NAME) note that the name of the ion pump will be specified in the configuration file and allow both ion pumps for a given cryostat to have a unique name (e.g., Ech and Coll for echelle side and collimator side.)
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Keyword
...
Value
...
Type
...
$(NAME)_CURR
...
The current at the pump in Amps.
...
Double - read only
...
$(NAME)_VOLT
...
The voltage at the pump in … Volts.
...
Double - read only
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$(NAME)_STATUS
...
Current controller status - see manual for details
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String - read only
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$(NAME)_PUMPON
...
Is the pump on?
0 - no
1 - yes
2 - unknown (most likely only at startup or if connection lost)
If written, will apply that state. Unknown is a no-op on a write.
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Enumerated - is writable.
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$(NAME)_LCK
...
Locks turning the pump off and on.
0 - Locked
1 - Unlocked
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Enumerated
...
$(NAME)_IP_MODEL
...
.
...
String - read only
...
)
...
Firmware version of the device as reported by the device.
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String - read only
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DISP#XXXX
...
Usual dispatcher keywords.
STOP - stops dispatcher
CONN - IP address and port
DEV - device name from config file
STA - status and includes whether or not a connection is made.
...
The required sections are:
main which points to service name and stdiosvc configuration file
device which has the details of the device
dispatcher which has the dispnum value and the $(NAME) variable
Configuration | Value | Explanation |
|---|---|---|
address | 192.168.23.149 auxrack-ionpump-3 | the IP address of the device, can include an optional name from /etc/hosts |
port | 23 | IP port to telnet to |
poll_time | 5 | how often to query for the data from the device |
device_name | Green Collimator IP | this is the value of the DISP#DEV keyword, so a long name is helpful |
cal | 1.00 | the calibration value, applied at the initial connection by the dispatcher, needs to be between 0 and 1 |
size | 2.0 | the size of the pump in L/s, should be 2.0 |
dispnum | 2 | the number of the dispatcher |
name | Coll | The short name used for keywords as $(NAME). The service name will include the name of the cryostate (kpfgreen / kpfred) and this is for the IP. |