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RF SYSTEM: CONTROLS, INTERLOCKS and MONITORING
Kevin Ronald, 15th March 2015- Note this document is issued as basis for discussion, and to start to form a list of
interfaces. It’s contents are subject to substantial change and update.
Structure
Page 1 and 2 define key areas where I perceive monitoring and possibly interlocking is required. At present this may
require further subdivision into individual inputs. Subsequent pages use these subsystems to define the particular
aspects which need to be monitored in each state. The idea is that the system will be subject to instructions from the
operators to change the state- the rest of this should proceed automatically. There are two extended transition
states one can imagine and these are defined here although they do not have particular ‘states’ as far as the
operators are concerned, since they do have peculiar requirements for monitoring. Note NOT yet analysed is the
process for shutting down the system. It is assumed that the transition from STANDBY to ENABLED will be broadly
the reverse of the transition from ENABLED to EXTENDED STANDBY with the heaters being slowly wound down.
In due course I plan to turn this into a graphical representation.
1 Preparation of Cavities
1.A Monitoring of cavity vacuum, possibly at several points (At least 2 analogue inputs per system, perhaps 4, with
setpoints)
1.B Monitoring of vessel vacuum, possibly at several points (At least 2 analogue inputs per system, with setpoints)
1.C Monitoring of vacuum pump status (several pumps) (At least 2 digital inputs per system)
1.D Monitoring of cavity coolant flow and temperature (At least 1 digital and 2 analogue inputs per system)
1.E Interlock on differential pressure between cavity and vessel? There will now be a relatively poor conductance
path from the cavity to the cavity vessel. There will be monitors of the vacuum and probably need to ensure at some
critical vacuum pressure (on either side) we open a big commoning valve. I assume this latter is so critical it will be in
the design of the vacuum system and NOT an RF subsystem. It will also be backed by emergency burst discs.
However we should check and we need to monitor the status.
1.F Monitoring and control of tuner system pressures- to be used to do Low power tests when cavity is under
vacuum- required for low level tests. (7 analogue inputs per system (one for master system pressure and one each
for each actuator pressure) one digital input for health check of tuner control system, and 2? analogue outputs to
request tuning of resonator – under control of LLRF board)
Note many of the above are not part of the HPRF system controls, but assurance that all of these are OK should be
determined before RF READY is possible. Should any of these fault the RF should revert from any state above READY
to READY immediately, so some of them need to feature in interlocks.
2 RF operations
Parameters in blue, control interfaces in red. Principle is to define as far as possible interlocks for EACH power
system, so that they can be operated independently. Suggest that the controls as seen by the operators are for RF
system no 1, RF system no 2 separately, with monitoring separately for each. Optionally offer the operators the
option to command the system as a twinned pair, when the control system will simultaneously instruct each system
identically. Monitoring should still be individual. May need to consider if there are some interlock faults on one
subsystem that should drop out both? Key parameters to be monitored/controlled:
2.A Hardware Keys (validation of paper controls- closure of RF system) 2 Keys, 2 digital inputs per system, (dual
switches cross monitoring? Switches and therefore inputs should be three state- OFF, RF TEST and OPERATE)
2.B Coolant: 1 circuit for each RF load, 3 or 4 circuits (and 1 air?) for each 4616 system, 1 water and 1 air for TH116,
two complete sets, coolant for SSPA? (Digital inputs. To allow for test configurations we should allow for four load
water inputs, and one for MICE operation, 3 or 4 digital inputs for water for 4616, one for water for TH116, 1 for
compressed air, all per RF system).
2.C PSU coolant (1 for each of the two PP supplies for each system - unclear how many different circuits we should
subdivide to? Each will have digital input to controls)
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation), (2 analogue inputs with
setpoints)
2.E Monitor Mains conditions (one digital input per system)
2.F Heater Current/Voltage in 4616 and 116 (4 analogue inputs per system with setpoint trips, one 3 state digital
input)
2.G Radiation Monitors (At least one analogue input per system with setpoint- possibly more)
2.H RF waveforms on output and reflection for each 116, 4616, SSPA, (5 forward and 5 reflection, 1 tap off, analogue
with ~us speed and history records to detect reflection spikes/sparks- need clever logic to decide what action is
required- not simple set points)
2.J Pulsed Power Waveforms (2 analogue per system, monitoring at ~us speed with logic to determine response to
any fault conditions- the interlocks for this are already in the PSU system- but we need to monitor these)
2.K State change requests- monitor transitions of system, and condition of H/W keys (Need one digital input per
system able to record 5 operating conditions plus one or two different test conditions, so ~8 states, 8 bit should be
sufficient)
2.L PPS RF Permit: (1 digital input per system, Three state, OFF, TEST RF and OPERATE)
2.M HT enclosures shut: (these interlocks are already in the hardware of the PSU’s, but need to monitor these- at
least 4 digital indicators)
2.N HT Earths status, HT Charging PSU’s status, LLRF and SSPA status (6 digital inputs per system- health of each
component, two analogue outputs (HT charge status) and three analogue inputs (control HT charge level, LLRF drive
level))
2.P Monitoring of status HT Charging PSU’s, Crowbar status, LLRF status, SSPA status
Current estimates of control interfaces
Each Cavity: 17 analogue inputs, 2 analogue outputs, 4 digital inputs (2 logic states)
Each RF system: 24 digital inputs (2 logic states), 4 digital inputs (3 states), 1 digital input (8+ logic states), 22
analogue inputs (12 are high, ~MHz, speed), 3 analogue inputs
Summary of how the above interlocks be used in logic systems to provide automated control of state transitions
2.1 OFF
New Conditions
None
Conditions inherited from Prior State
None
New Monitoring Activity
2.K State change requests
Monitoring Activity inherited from prior states
Monitor cavity/vessel vacuum, vacuum pump status etc, section 1A-1F
2.2 ENABLED
NEW Conditions
REQUIRES: 2.A Hardware Keys
Conditions inherited from Prior State
None
New Monitoring Activity
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status, monitor mains quality,
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
Monitoring Activity inherited from prior states
Monitoring of cavity system 1A-F.
2.K state change requests
2.3 TRANSITION TO EXTENDED STANDBY (a period of 10’s of minutes)
Valve heaters brought online
NEW Conditions
REQUIRES: System in ENABLED: EXTENDED STANDBY requested by operators: 2.B RF load coolant OK: RF tube
coolant (4/5) OK: Compressed Air OK: 2.C PSU coolant OK: 2.D Line Pressure OK: 2.E Mains Quality OK
Inherited Conditions
2.A Hardware keys to validate paperwork, closure of RF system
New Monitoring Activity
2.F Monitoring of heater current and voltage of TH 116 and Burle 4616 – Note this should be on a timeout- if
nominal level not reached in some time window, fault out and revert to ENABLED
Inherited Monitoring Activity
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
2.K state change requests
1.A-F cavity conditions
2.4 EXTENDED STANDBY (entered automatically after time window)
New Conditions/Requirements (Interlocks)
REQUIRES: EXTENDED STANDBY requested by operators: 2.F Heater current and voltage of TH 116 and Burle 4616Should be stable and slightly below normal spec.
Inherited Conditions (Interlocks)
2.A Hardware keys: 2.B RF load coolant (3): RF tube coolant (4/5): Compressed Air: 2.C PSU coolant; 2.D SF6
pressure; 2.E Mains Quality:
New Monitoring Requirements
None
Inherited Monitoring Requirements
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
2.F Monitoring of heater current and voltage of TH 116 and Burle 4616
2.K state change requests
1.A-F cavity conditions
2.6 STANDBY (entered automatically after time window)
New Conditions/Requirements (Interlocks)
REQUIRES: STANDBY requested by operators: 2.F Heater current and voltage of TH 116 and Burle 4616- Should be
stable on normal spec.
Inherited Conditions (Interlocks)
2.A Hardware keys: 2.B RF load coolant (3): RF tube coolant (4/5): Compressed Air: 2.C PSU coolant; 2.D SF6
pressure; 2.E Mains Quality:
New Monitoring Requirements
None
Inherited Monitoring Requirements
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
2.F Monitoring of heater current and voltage of TH 116 and Burle 4616
2.K state change requests
1.A-F cavity conditions
2.7 READY
HT circuits enabled, validate state of PPS
New Conditions (Interlocks)
REQUIRES: System in STANDBY: READY requested by operators: 2.L PPS RF Permit: 2.M HT enclosures shut: 1.A, 1.B,
1.C Cavity and Vessel pressure Nominal: 1.D Cavity coolant Nominal: 1.F Cavity tuner pressures. NOTE interface
decision- possible that the entire health of the cavity should be monitored as a single unit and a single GO/NO GO
sent back to the RF system?
2.P Should Crowbar fire- need to pause experiment before recharge- system should fault to STANDBY Require
adequately low crowbar/resistor temperature.
Inherited Conditions (Interlocks)
2.A Hardware keys: 2.B RF load coolant (3): RF tube coolant (4/5): Compressed Air: 2.C PSU Coolant; 2.D SF6
Pressure; 2.E Mains Quality: 2.F Valve heaters nominal
New monitoring Activity
2.N HT Earths status, HT Charging PSU’s brought online, LLRF and SSPA brought online
2.P Monitoring of status HT Charging PSU’s, Crowbar status, LLRF status, SSPA status, crowbar resistor temperature.
Inherited Monitoring Activity
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
2.F Monitoring of heater current and voltage of TH 116 and Burle 4616
2.K state change requests
1.A-F cavity conditions
2.8 ON
REQUIRES: System in READY: ON requested by operators:
New Conditions (Interlocks)
2.H Nominal RF waveforms (if excessive reflections then define an action, reducing the amplitude of next pulse and
slowly build up). If excessive reflections are repeated, FAULT to standby. Also monitor forward power and if
repeatedly below request drop to standby. 2.G Radiation sensors, if excessive radiation drop drive power and slowly
build up. If repeated excessive radiation FAULT to standby.
Inherited Conditions (Interlocks)
REQUIRES: System in STANDBY: READY requested by operators: 2.L PPS RF Permit: 2.M HT enclosures shut: 1.A, 1.B,
1.C Cavity and Vessel pressure Nominal: 1.D Cavity coolant Nominal: 1.F Cavity tuner pressures. NOTE interface
decision- possible that the entire health of the cavity should be monitored as a single unit and a single GO/NO GO
sent back to the RF system?
2.P Should Crowbar fire- need to pause experiment before recharge- system should fault to STANDBY Require
adequately low crowbar/resistor temperature.
2.A Hardware keys: 2.B RF load coolant (3): RF tube coolant (4/5): Compressed Air: 2.C PSU Coolant; 2.D SF6
Pressure; 2.E Mains Quality: 2.F Valve heaters nominal
New Monitoring Activity
2.G RF waveforms- need to know if RF signal is on correct amplitude and is phase stable
2.H Radiation monitors- to allow diagnostics should system keep faulting off
2.I Pulsed power waveforms – to allow investigation of poor RF waveforms
Inherited Monitoring Activity
2.B Monitor coolant to RF loads, RF amplifiers (one circuit each for two loads, 3 or 4 circuits for 4616 Amplifier, 1 for
116 amplifier), compressed air status
2.C Monitor PSU coolant if appropriate?
2.D Monitor of Co-Axial Line pressure (make sure we have the right SF6 pressurisation)
2.E Mains Quality
2.F Monitoring of heater current and voltage of TH 116 and Burle 4616
2.K state change requests
1.A-F cavity conditions
2.N HT Earths status, HT Charging PSU’s brought online, LLRF and SSPA brought online
2.P Monitoring of status HT Charging PSU’s, Crowbar status, LLRF status, SSPA status, crowbar resistor temperature.