1. UITF MPS system requirements

2. UITF MPS – what will it protect?
Protect the ¼ CM
Maintain vacuum in the beamline, no burn-throughs
Protect our viewers
Protect our magnets
Protect the experiment, like HDIce

3. UITF MPS System inputs
UHV ion pumps- all ganged to a single dry contact
BLM/BCM type inputs (qty 10)
HDice “off target” detector (qty 1)
Dipole magnet window comparators (qty 3)
¼ cryounit quench detector? (qty 1)
?? (5 more inputs for unknowns)

4. UITF MPS System outputs
Signal to close all valves if UHV ion pump dry contact opens. This signal will also turn off laser. Note: Since this is a very infrequent event, we may want to also shut down Glassman HVPS
All other inputs will only turn off laser using the tune mode generator system (which uses an RTP cell for <250ns response, backed up by shutter 5-10ms later)

5. MPS timing requirements
All inputs should be processed to create an output within 10 micro-seconds.

6. MPS system communications
All inputs are visible to EPICS
All outputs are shown on EPICS
First fault detection is desirable and the first fault should be visible on EPICS
EPICS should have the ability to mask or clear any input

7. Up for discussion
Hansknecht- I dislike the expense and complexity of fiber optic systems, but a simpler fiber system could be useful because the only other option is running RG-58 everywhere. I like the “plastic fiber optic” systems available where the inexpensive plastic fiber is simply cut to length and inserted in a transmitter or detector.
We don’t need to modulate the light. We just say “light=OK, no light=BAD”
See
And see
These devices through cheap plastic fiber would give us a system that responds in sub microsecond regime.

8. Additional discussion
This fiber might be useful to build the HDice “off target” detector.
Simply route it into a fast photodiode and trip beam if it see’s light.