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Table of Contents:
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Introduction
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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Proposal: name each ion pump with respect to its camera (Green/Red) and the side of the spectrometer it is on (Echelle/Collimator)
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Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Ion Pump Controller | 4 | Gamma | SPC-1-P-S-1-US110-E-S-N |
Ion Pump | 4 | Gamma | 3SDI1V5KNN (3S TiTan) |
Air Cables | 4 | Gamma | 10K-SC10-10K (10 m) |
Vacuum Cables | 4 | Custom |
Note there are two pumps per cryostat. One will be operated and the second will sit idle as a backup.
Each pump has a dedicated controller.
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Relevant Functional Block Diagram
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Software Actions
Action | Notes | |||||
|---|---|---|---|---|---|---|
| 1 | SG needs to update | 2 | 3 | Green controller 1: take pressure measurement | Value GRN_ION_E: Read telemetry | Pressure, Voltage, and Current values reported as telemetry (see below) |
| 4 | Green controller 2: take pressure measurement | Value reported as telemetry (see below) | ||||
| 5 | Red controller 1: take pressure measurement | Value reported as telemetry (see below) | ||||
| 6 | Red controller 2: take pressure measurement | Value reported as telemetry (see below) | ||||
| 7 | Green controller 1: turn pump on | 8 | Green controller 12 | GRN_ION_C: Read telemetry | ||
| 3 | RED_ION_E: Read telemetry | |||||
| 4 | RED_ION_C: Read telemetry | |||||
| 5 | GRN_ION_E: turn pump on | These controls should have a lock applied so they cannot be accidentally switched. | ||||
| 6 | GRN_ION_E: turn pump off | |||||
| 9 | Green controller 27 | GRN_ION_C: turn pump on | 10 | Green controller 2|||
| 8 | GRN_ION_C: turn pump off | |||||
| 11 | Red controller 19 | RED_ION_E: turn pump on | 12 | Red controller 1|||
| 10 | RED_ION_E: turn pump off | |||||
| 13 | Red controller 211 | RED_ION_C: turn pump on | 14 | Red controller 2|||
| 12 | RED_ION_C: turn pump off |
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Required Adjustable Settings
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Parameter | Report Frequency | Purpose | Notes | |
|---|---|---|---|---|
| 1 | SG needs to update | |||
| 2 | ||||
| 3 | Green controller 1 pressure value | Once per minute (TBC) | Monitor green cyrostat pressure | |
| 4 | Green controller 2 pressure value | Once per minute (TBC) | Monitor green cyrostat pressure | |
| 5 | Red controller 1 pressure value | Once per minute (TBC) | Monitor red cyrostat pressure | |
| 6 | Red controller 2 pressure value | Once per minute (TBC) | Monitor red cyrostat pressure |
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Parameter | Threshold | Notes | |
|---|---|---|---|
| 1 | Green controller 1 pressure high | TBC | 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. |
| 2 | Green controller 2 pressure high | TBC | |
| 3 | Red controller 1 pressure high | TBC | |
| 4 | Red controller 2 pressure high | TBC | |
| 5 | |||
| 6 | High Voltage turns off | ||
| 7 | |||
| 8 | |||
| 9 |
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Relevant Datasheets & Manuals
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Device Command List for KPF
Noted as a ‘draft’ at this point as need to finalize Arc Detection command setting.
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