CBETA Equipment Protection System

*Responsible personnel: Nalanjan Banerjee, Adam Bartnik, John Dobbins, Karl Smolenski, Rob Michnoff, and others
*Date: February xx, 2019

Overview

The specific equipment protection system requirements, operational details and system testing is separately defined for each intended mode of operation.

A detailed document describing the CBETA equipment protection system is available at the following link:

• https://docs.google.com/document/d/1zoNZtdD_3E4BWoLt0BdfqcTbcgH6WGTuwgNiMugJASU/edit

Permanent Magnet Protection

In order to protect the Halbach permanent magnets in the FFA loop from demagnitization, beam losses on any individual magnet must be limited to less than 100 pA continuous current.

Modes of Operation

These are the current modes of operation, set automatically in EPICS under the variable EPSSTE01_state.

Index	Name	Description	Max I	Max Q	Period	N bunches
-1	Undefined	Error state	0	0	1 s	0
0	MACHINE OFF	Interlocks are not set, machine is off	N/A	N/A	1 s	200,000
1	ZERO CHARGE MODE	Laser power low, up to 100% duty factor	1 uA	25 fC	1 s	42,000,000
2	Gun-ICM Only	beam ends at MA3DPA01, used for phasing the ICM	1 uA	5 pC	1 s	200,000
3	Diagnostic Line (Slits IN)	6 MeV beam through diagnostic line, beam lost on shielded slits	1 uA	5 pC	1 s	200,000
4	Diagnostic Line (Slits OUT)	6 MeV beam through diagnostic line, beam lost at end of line	100 nA	5 pC	1 s	20,000
5	MLC OFF	Beam through MLC, but no cavities enabled	100 nA	5 pC	1 s	20,000
6	MLC (Single Cavity)	Single cavity operation, phasing / calibration	100 nA	5 pC	1 s	20,000
7	MLC	Many cavity operation	10 nA	5 pC	1 s	2,000
8	Dump Line	Beam enters dump line at 6 MeV	100 nA	5 pC	1 s	20,000
9	S1 Splitter	Beam in S1 line, but not into the FFA line	10 nA	5 pC	1 s	2000
10	FFA Arc	Beam into the FFA line	5 nA	5 pC	1 s	1000

List of rules for each mode

-1 : Undefined

• This state occurs when none of the other states are valid. It should not happen in normal operation

0 : MACHINE OFF

• PPSMRC00_led.RVAL == 0

1 : ZERO CHARGE MODE

• | MA3DPA01 _cmd | < 0.1 amps
• LLRLDM01_low_on_led == 1

2 : Gun-ICM Only

• | MA3DPA01 _cmd | < 0.1 amps

3 : Diagnostic Line (Slits IN)

• MA3DPA01 _cmd > 0.1 amps
• At least one slit in: (IB2SLH01 _in_led = 1) || (IB2SLV01 _in_led = 1) || (IB2SLH02 _in_led = 1) || (IB2SLV02 _in_led = 1)

4 : Diagnostic Line (Slits OUT)

• MA3DPA01 _cmd > 0.1 amps
• All slits out: (IB2SLH01 _in_led = 0) && (IB2SLV01 _in_led = 0) && (IB2SLH02 _in_led = 0) && (IB2SLV02 _in_led = 0)

5 : MLC OFF

• MA3DPA01 _cmd < 0.1 amps
• | MS1DIP01 _cmd | <= 0.5
• Number of MLC cavities not tripped == 0

6 : MLC (Single Cavity)

• MA3DPA01 _cmd < 0.1 amps
• | MS1DIP01 _cmd | <= 0.5
• Number of MLC cavities not tripped == 1

7 : MLC

• MA3DPA01 _cmd < 0.1 amps
• | MS1DIP01 _cmd | <= 0.5
• Number of MLC cavities not tripped > 1

8 : Dump Line

• Not implement yet

9 : S1 Splitter

• MA3DPA01 _cmd < 0.1 amps
• MS1DIP01 _cmd > 0.5
• MS1DIP08 _cmd < 0.5

10 : FFA Arc

• MA3DPA01 _cmd < 0.1 amps
• MS1DIP01 _cmd > 0.5
• MS1DIP08 _cmd > 0.5

Description of test

Confirm that all EPICS IOC names communicate with the defined hardware module.

Test Procedure

• Open the EDM screen xxxxx
• Click on XXX to do something important
• Provide embedded pics if needed and links to spreadsheet lists or other details
• Do this that and other stuff
  • Expected result: xxxxxxx
• Do more important stuff
  • Expected result: xxxxx

Actual results

(02/xx/2019, name) As expected or explain what did not operate as expected

• links to related details

Problems found

• List any problems

Other notes

• blah blah blah

-- RobMichnoff - 12 Feb 2019