1. MICE RF Power System – Project Update for CM 31 March 2016 Tim Stanley, MICE RF Engineer
ELEMENTS:
Need to install, integrate, commission and operate:
2 X 2 MW RF Amplifiers systems
2 X 10 MV/m cavities
RF TX lines
Operating Control system
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

2. RF System – Amplifier-Cavity Chain

3. RF Amplifiers
RF Drive amplifiers and PSUs System #1 at Daresbury for proving of 2nd 116-tube 2 MW amplifier and RF operating control system.
* If any of these issues caused a schedule delay or need to be discussed further, include details in next slide.

4. RF Amplifiers
2nd 116-tube amplifier has been installed and operated in the test-lab at Daresbury; 1 MW achieved during March with limited test-tube.
* If any of these issues caused a schedule delay or need to be discussed further, include details in next slide.

5. 1 MW RF output

6. 1 MW test – numerical results; 116 amplifier #2 functional test

7. Will swap to new tube, for tests to 2 MW, after resolution of spikes seen on HT waveforms in recent tests: 116 Anode HT – Purple trace 116 Anode current – blue trace

8. 4616 HT – green trace 4616 Anode current – purple trace (4616 Anode current - different CT – blue trace)

9. New solid-state crowbar fitted and tested in 40 kV PSU; DC and RF tests so far to 1 MW
* If any of these issues caused a schedule delay or need to be discussed further, include details in next slide.

10. Crowbar Test 1, 10 kV, no load Ch1: Orange - output pulse from crowbar trigger board Ch2: Blue - voltage (probe is 10000:1 but scope is set to 1000:1 as 10000:1 not available) Ch3: Purple – crowbar trigger (light in F/O cable) Ch4: Green  - main capacitor bank current Timebase: 20 us/div

11. Crowbar test 2, 10 kV, RF decoupling capacitors and HT lead, to 116 amplifier #2, connected; 116 amplifier fully off. Ch1: Orange - output pulse from crowbar trigger board Ch2: Blue - voltage (probe is 10000:1 but scope is set to 1000:1 as 10000:1 not available) Ch3: Purple – crowbar trigger (light in F/O cable) Ch4: Green  - main capacitor bank current Timebase: 20 us/div

12. Crowbar test 3, 35kV, RF decoupling capacitors and HT lead, to 116 amplifier #2, connected; 116 amplifier fully off. Ch1: Orange - output pulse from crowbar trigger board Ch2: Blue - voltage (probe is 10000:1 but scope is set to 1000:1 as 10000:1 not available) Ch3: Purple – crowbar trigger (light in F/O cable) Ch4: Green  - main capacitor bank current Timebase: 20 us/div

13. Build of RF amplifier system #2 is progressing: Many of the PSU system crates are built and ready for installation in racks, once System #1 shipped from DL. SSPA run-up OK

14. RF Cavities – Installation Issues
Singe Cavity Test Stand during tests at FNAL

15. Cavities – installation issues
Services:
Vacuum – inner and outer; fail-safe system required to avoid stress on Be windows.
Water – tight temperature-control for frequency stability; Dissipation 2 kW per cavity. Aim to run at ~ 35 degrees C to discourage water condensation within cavity.
Compressed air – for actuation of mechanical tuners
Electrical supplies for instrumentation etc.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

16. Cavities – installation issues
Definition of instrumentation for monitoring and control soon to be finalised with LBNL
Detail of all interfaces to be defined
RF pre-test at low-level before shipping to RAL
To minimise preparation activity in the MICE Hall:
Cavities to be delivered within vacuum vessel as complete units, perhaps including RF coupler-arms fitted, purged with N2.
RF high-power test (2 MW) in MICE Hall outside beamline.
Clean-room tent required for installation to beam-line, and for any intervention of vacuum-vessel or cavity
Support, in-person at RAL, from LBNL, very welcome
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

17. Cavities – Radiation Protection
Shielding, afforded by MICE Hall, largely satisfactory according to RAL RPA; but holes through to MLCR area need analysis. Definition, by RAL Radiation Protection Advisor , to be informed by latest results from FNAL (preliminary results have not caused particular concern). Monitoring at the two (three?) MICE Hall entrances to be by sodium iodide detectors, feeding into overall MICE control, to trip RF at safety threshold. (RPA has relinquished previous requirement to stop particle-beam). Initial monitoring also inside wall by several absorption detectors (rad. badges) TS intends also a real-time radiation sensor, in proximity of cavities, for indication on GUI, and for logging.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

18. Cavities – Vacuum System
Imperative that Be windows are not exposed to significant stress by differential pressure by inner and outer vacuums; RAL target <<1 p.s.i?
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

19. RF Cavities
Design of vacuum system is outside the responsibility of RF group; RAL PPD Department expertise – Mark Tucker
Issue of siting vacuum gauges and pumps away from B-field as necessary – FNAL experience can inform.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

20. LLRF

21. Layout for DMIC (dwg not yet accurately definitive)

22. RF Transmission Lines
Hardline requires accurate installation survey and drawings - DL and RAL DO effort
Some mechanical cuts and re-flanging by RAL/DL workshops, to existing stock, is underway. (Two long spans, from RF amplifiers to cavities, to be cut on fitting).
Need of structural mods to mezz floor – outside contractors to design and execute.
G3 pressurisation (alternative to SF6) for voltage stand-off, required as per original MICE design brief.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

23. Operating Control System
Ajit Kurup, IC, welcomed to RF team to assist with provision of Operating Control System. Controls presentation in RF session yesterday.
Definition of all control functions completed;
cavity tuners need driver software to be written ?LBNL/STFC
Build:
Technical design and build by DL is continuing.
Pre-Test at DL in RF test bed.
Modus Operandi in operations:
Should not be necessary to have constant RF expert presence, once system has been through start-up procedure.
Envisaged to have expert and non-expert operating modes in operator GUI.
RF expert on-call rota.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings

24. Operating Controls Definition (9 pages!)
Parameter number
parameter
"Enable" – binary-state output from control system
"Indication" - Binary-state Input to control system
Setpoint -analog
Readback - analog
Value
Comments
System must NOT be in remote control mode?? _To be discussed. Appointed personnel to manually turn on all services to RF system, and to manually switch-on mains-powered crates in the RF sytems racks; this will be defined in the MICE RF Operating Instructions
System in remote control??
Remote control? TBD 1
4kW solid state amplifier
Enable via PSU PLC. (Also receives timing pulses, from pulse generator, via PSU PLC)
Amplifier on indication from PSU PLC to EPICS no
“On” indication on RF GUI NR
Enable SSPA; "amplifier on" signal required to be maintained
"amplifier on" signal required to be maintained
amplifier on signal required to be maintained 2
Forward power; analogue to ctrl system (NOT an LLRF function)
0-10? = 0 to 4kW
>>>TPS to check whether SSPA has intrinsic SWR protection
Indicate forward power on GUI 3
4616 crowbar heater
"Crowbar OK"
"Crowbar OK" indication on RF GUI
Indicates that crowbar heater warm-up timer has finished.
"Crowbar OK" signal required
Crowbar OK signal required 4
4616 Air supply
"Air OK"
"Air OK" indication on RF GUI
"Air OK" indication from 4616 PSU PLCs
Air OK indication from 4616 PSU PLCs 5
4616 cabinet doors
"Panel doors OK"
"Panel Doors OK" indication on RF GUI
"Panel doors OK" indication from 4616 PSU PLCs
Panel doors OK indication from 4616 PSU PLCs 6
4616 HT voltage
Analogue control of HT voltage
Analogue readback of HT volatge
0-10 = 0-20kV
Analogue manual control, of HT voltage, to be availble on GUI only in "RF EXPERT" control mode
AFTER HT supply is truned on, automatically ramp, over a few seconds, the HT voltage to operating level. Monitor HT voltage, and current; if either is out of limit, execute HT crowbar. Calculate and monitor and display level of anode disspiation during each pulse (see Note 1); if out of limit, execute HT crowbar which MUST include removal of screen voltage - as per PLC logic on current protoype PSU?
Monitor HT voltage, and current; if either is out of limit, execute HT crowbar.
Monitor HT voltage, and current; if either is out of limits, switch OFF 4616 screen supply, then 4161 and 166 HT supplies 7
Analogue readback of HT current
0-10 = 0 to 100A
Monitor and display; detail described in param 6 "4616 HT Voltage"
(Readback HT current on GUI) 8
4616 HT PSU
1 digital output needed to switch unit on
binary-state* channels of indications from PSU PLC(crowbar ok, power supply status etc.)
Some channels are itemised above
After pre-set of HT to zero, switch on HT supply to 4616 anode.
HT supply on indiatcion required ot be mainatined. Calculate and monitor and display level of anode disspiation during each pulse (see Note 1); if out of limit, execute HT crowbar which MUST include removal of screen voltage - as per PLC logic on current protoype PSU?
HT supply on indiatcion required ot be mainatined
*Screen and control grid indications are tri-state. 9
4616 filament
1 digital output needed to switch unit on when commanded via RF GUI
Yes from Eurotherm timer to confirm timer finished
Under ramped control by eurotherm controller to 1. target power set point for dark heat (EXTENDED STANDBY state), or 2. full heat(STANDBY state)
Filament current
0-10 = 0 to 500A
Execute start of ramp-up of filaments power TO DARK HEAT VALUE; Monitor value of current; Monitor value of power indicated by Eurotherm controller; Dark Heat power-level must be achieved. If exceeeds limit, kill power to 4616 filament.
Execute start of ramp-up of filaments power TO OPERATING VALUE; Monitor value of current; Monitor value of power indicated by Eurotherm controller; If exceeds power limit, kill power to filament.
Monitor value of current; Monitor value of power indicated by Eurotherm controller; Operating power to be maintained; kill filamnet power if exceeds limt
Monitor value of current; Monitor value of power indicated by Eurotherm controller; Operating power to be maintained
Monitor value of current; Monitor value of power indicated by Eurotherm controller; Operating power to be maintained; if out below limit, switch off 4616 HT supply (do not crowbar)
voltage; if out of limit, prevent further automatic switch-on sequence and alert on GUI 10
Filament voltage
0-10 = 0 to 2V
Monitor value of voltage 11
4616 Grid 1 voltage
Analogue control of Grid 1 voltage
Analogue readback of Grid 1 volatge
0-10v =0to 300V; resolution to be 1 V
Set grid voltage to operating value; this MUST be done before application of anode HT and screen grid supply voltage; Monitor voltage; if out of limit, prevent further automatic switch-on sequence and alert on GUI
Exectute set to operating value. Monitor voltage; if out of limit, prevent further automatic switch-on sequence and alert on GUI
Monitor voltage; if out of limit, fire crowbar; prevent further automatic switch-on sequence; alert on GUI
Monitor voltage; if out of limit, switch off 116 and 4616 HT
Readback value

25. RF Installation Programme
Under review in respect of the STEP IV running and magnet repair issues.
RF not critical path in current MICE programme, but amplifier system #1 required soon, in MICE Hall, in order to test cavities.
Cavities expected, from LBNL, in August and September.
RF engineer resource expected, from ISIS RF, to assist in installation and operation of MICE RF. Tim Stanley will be integrated into ISIS RF team, for harmonised management, but remain 100% on MICE RF.
What is the project about?
Define the goal of this project
Is it similar to projects in the past or is it a new effort?
Define the scope of this project
Is it an independent project or is it related to other projects?
* Note that this slide is not necessary for weekly status meetings