Ion Pump Controller

Table of Contents:

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).

Proposal: name each ion pump with respect to its camera (Green/Red) and the side of the spectrometer it is on (Echelle/Collimator). The driver here is that the name then 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!

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	-

Relevant Functional Block Diagram

Software Actions

	Action	Notes
1	GRN_ION_E: Read telemetry	Pressure, Voltage, Current and High Voltage Status values reported as telemetry (see below)
2	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
7	GRN_ION_C: turn pump ON
8	GRN_ION_C: turn pump OFF
9	RED_ION_E: turn pump ON
10	RED_ION_E: turn pump OFF
11	RED_ION_C: turn pump ON
12	RED_ION_C: turn pump OFF

Required Adjustable Settings

Setting	When Needed			Notes
	Build	Observing	Maintenance

Required Telemetry

	Pump	Parameter	Report Frequency	Purpose
1	GRN_ION_E	Pressure	Once per minute TBC	Monitor cyrostat pressure
2		Voltage	Once per minute TBC	Monitor cyrostat pressure
3		Current	Once per minute TBC	Monitor cyrostat pressure
4		High Voltage Status	Once per minute TBC	Ensure pump is on
5	GRN_ION_C	Pressure	Once per minute TBC	Monitor cyrostat pressure
6		Voltage	Once per minute TBC	Monitor cyrostat pressure
7		Current	Once per minute TBC	Monitor cyrostat pressure
8		High Voltage Status	Once per minute TBC	Ensure pump is on
9	RED_ION_E	Pressure	Once per minute TBC	Monitor cyrostat pressure
10		Voltage	Once per minute TBC	Monitor cyrostat pressure
11		Current	Once per minute TBC	Monitor cyrostat pressure
12		High Voltage Status	Once per minute TBC	Ensure pump is on
13	GRN_ION_C	Pressure	Once per minute TBC	Monitor cyrostat pressure
14		Voltage	Once per minute TBC	Monitor cyrostat pressure
15		Current	Once per minute TBC	Monitor cyrostat pressure
16		High Voltage Status	Once per minute TBC	Ensure pump is on

Required Alarms

	Parameter	Threshold	Notes
1	GRN_ION_E pressure too high	TBD	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	GRN_ION_C pressure too high	TBD
3	RED_ION_E pressure too high	TBD
4	RED_ION_C pressure too high	TBD
5	GRN_ION_E high voltage off	TBD
6	GRN_ION_C high voltage off	TBD
7	RED_ION_E high voltage off	TBD
8	RED_ION_C high voltage off	TBD

Relevant Datasheets & Manuals

	Description	Source
1	SPC Controller Spec Sheet	https://www.gammavacuum.com/index.php/product?id=64
2	SPC Controller Manual	https://www.gammavacuum.com/index.php/product?id=64
3	SPC ModBus Register Map	https://www.gammavacuum.com/index.php/product?id=64
4	Ion Pump specs (Titan 3S-DI-1V-5K-N-N)	Screengrab of: https://www.gammavacuum.com/products/small-titan-ion-pumps/3211/3s-titan-ion-pump?number=&c=17662

Device Command List for KPF

Noted as a ‘draft’ at this point as I need to finalize Arc Detection command setting.

Relevant Software

	Description	Source
1	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: spc 01 which should return: 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)
2	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: s.send(('spc 0B' + "\r\n").encode())	https://gist.github.com/tspspi/779d96f305f719082d2db1e201856375/revisions
3	SPC Firmware	https://www.gammavacuum.com/index.php/product?id=64
4	SPC Labview Drivers (likely not useful, but included for completeness' sake)	https://www.gammavacuum.com/index.php/product?id=64

Installation Instructions

Description	File
Enable the high pressure resolution mode (this is a front-panel-only setting).

Dispatcher Implementation

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.)

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
$(NAME)_STATUS	Current controller status - see manual for details	String - read only
$(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.	Enumerated - is writable.
$(NAME)_LCK	Locks turning the pump off and on. 0 - Locked 1 - Unlocked	Enumerated
$(NAME)_IP_MODEL	Model of the device as reported by the device.	String - read only
$(NAME)_IP_FIRMWARE	Firmware version of the device as reported by the device.	String - read only
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.