1. UITF Conduct of Operations Review
UITF Review #3
Machine Protection System
Matt Poelker
Wednesday, April 24, 2019

2. UITF Machine Protection System - what will it protect?
Protect the QCM (we also call it “the booster”)
Protect against beam loss and burn-through, maintain ultrahigh vacuum
Protect viewers (this is a software interlock – Not a fast shutdown node, FSD)
Protect magnets, ensure proper field for beam transport: comparator interlock, water flow or klixon interlocks
Protect RF beamline components: vacuum and water flow interlocks
Protect cups, apertures and dumps: water flow interlocks (and limit beam current via “operational restriction”)
Protect the experiment, e.g., HDIce (mostly, this means putting the beam where it is supposed to go, limit beam current if necessary, protect against mis-steered beam)
UITF Conduct of Operations Review - MPS

3. Hardware configuration
Valves OPEN only when vacuum deemed acceptable
Current limiting resistors in series with magnets
Water flow interlocks at cups, dumps and apertures
Window comparators on dipoles and gun HV
Viewers inserted only when laser in pulsed-mode
Water flow interlocks at buncher and chopper cavities, RF applied to chopper and buncher only when vacuum reads “good”
Helium liquid level interlocked to klystron high power RF
UITF Conduct of Operations Review - MPS

4. FSD Input Signals
An FSD trip will shutter laser and sometimes close all valves
BLMs will shutter laser: CEBAF-style BLM modules
RF field control chassis with CEBAF-style FSD signals
Vacuum FSD signals from QCM, helium liquid level interlocked to klystron control panel
All beamline ion pumps ganged together, close laser shutter and close all pneumatic valves when pressure exceeds a setpoint
Window comparators using 16 bit ADC cards designed by EES
HDice “off target” detector (it will look like a BLM)
UITF Conduct of Operations Review - MPS

5. What happens when there’s an FSD signal is triggered?
UITF Machine Protection
Ion pump values too high, then can’t OPEN valves. Close valves when ion pump current rises too high
Chopper/Buncher Ion Pump current too high, can’t turn ON chopper/buncher RF, trip OFF the rf supplies
Viewer IN, allow only Viewer Limited beam
Water flow through apertures, cups and dumps OK
BLMs trip OFF beam, close laser shutter. These can be maskable so we can tune up in Tune Mode
Dipole window comparator on 15 degree ben magnet: no Laser when bend magnet current wrong
Gun HV window comparator, no laser when gun HV set wrong
UITF Conduct of Operations Review - MPS

6. Similar to CEBAF Safety System Group BLM chassis, x2 units
New LLRF control boards, aka Field Control Chassis
Cryo and SRF signals from QCM
Window comparators using 16 bit ADC cards designed by EES
FSD signals summed using VME boards with 12 input channels each
FSD signals transmitted via fiber at 5 MHz
SCAM to create low duty factor modes
CEBAF style pockel-cell tune mode generator: RTP cell with <250ns response time, backed by shutter that closes 5-10ms later
UITF Conduct of Operations Review - MPS

7. BLM locations
UITF Conduct of Operations Review - MPS

8. (Songsheets = UED) MeV beamline
UITF Conduct of Operations Review - MPS