MICE VC145 15-12-2011 Alain Blondel 1

NEWS and RF review

MICE RF power Review 7 December 2011 ReviewersRalph Pasquinelli FermilabKevin Ronald StrathclydePete McIntosh STFC DLMark Keelan STFC RALMike Woodward STFC RALErk Jensen CERN – By phonePresentersAndy Moss (DL) RF power stationAlan Grant (DL) RF layout Steve White (DL) RF controls

Review ChargeTo review the MICE RF power installation and distribution layout in terms of:• Suitability of components, materials and equipment for the MICE application and performance specification so that a major purchase can be confidently made•Specifically address RF control and monitoring and measurement of RF phase, amplitude and frequency•Compatibility and integration of the entire system with its surroundings•Ease with which the system can be assembled and tested•Suitable flexibility to adapt to each of the discrete MICE assembly steps

Report to MICE before Xmas

Highlights of presentations

Andrew Moss

Principle

Andy Moss

Andrew Moss

Vacuum RF Coupler LoopPhoto-

Multiplier

4 1/16” Coax Section

Flexible line section

6 1/8” t0 4 1/16” Coax Transition

6 1/8” Matched Tee

Dual Directional Coupler

MTA with 201MHz MICE cavity on testSlides courtesy of Al Moretti, Fermilab

Reality

Andy Moss

RF Layout – view behind shield wall

6

Alan Grant

RF Layout – view from cooling channel side

7Alan Grant

Predicted hall layout for RF components

Andrew Moss

Comment: 4 Amplifiers go to 8 cavitiesA1 C1&C2, A2 C3 and C4 etc. etc. Could it be sufficient to consider the cavities in pairs with relative phase adjusted for central muon velocity and adjust pair’s phaseat driver level without the cumbersome trombones

Andy Moss

Access & Egress

9

Discussed access & egress with Fire Safety Officer. Agreed this arrangement would be acceptable.

NB: This generated substantial discussion and needs to be revisited: reviewers wondered if access to maintain was practical enough

Amplifier cannot be lifted.

Alan Grant

MICE RF Design Review December 2011 10

RF HV Power Supplies - Components

Crowbar (38 kV Thyratron)

TH116 Circuit (lower part)

38 kV PSU – rear view20 kV PSU & Aux. rack – front view

38 kV PSU – resistor bank

HV PSU Control Unit

38 kV PSU – 1 MW RF output

Chris White

RF Control & Monitoring System

MICE RF Design Review December 2011 11

Network/ Controls

Rack

VME Crate

Canbus modules

DAC/ADC modules

EPICS Server

Heater Controller

(4616)

450V DC Bias PSU

Digital signals/serial link

4616 & TH116 Aux. Racks

PLC Crate (4616)

Grid PSU (4616)

Analog & digital signals

Heater Controller (TH116)

Analog & digital signals

Analog & digital signals

Interlocks

Panel switches

Water flow

Compressed air pressure

Heater V and I

Heater V and I

Interlocks

Typical I/LPLC Crate (TH116)

Digital signals/serial link

Screen PSU (4616)

Analog signals

Analog signals Enable

Enable

Enable

Enable

Enable

Interlocks

Chris White

MICE RF Design Review December 2011 12

TimescaleCurrent work in progress:• RF testing of System #1 with new 4616 and TH116 tubes Nov

11 to Dec11

Future work (Step V): time-scales to be confirmed• Assembly of CERN TH116 amplifier (System #2) ----------------------

(July 2012) • Test CERN amplifier at Daresbury -----------------------------------------

(December 2012)• Develop RF Control Systems • Pack & ship complete system #1 to RAL --------------------------------- (January

2013)• Install RF System #1 in MICE Hall ----------------------------------------- (May

2013)• Test complete RF system #1 at RAL --------------------------------------

(September 2013)• Construct & test 4616 #2 amplifier, power supply & controls• Construct & test TH116 #2 power supply & controls• Test complete RF system #2 at DL• Pack & ship system #2 to RAL• Install RF System #2 in MICE Hall• Test complete RF system #2 at RAL Tasks in red are required for TIARA (deadline in brackets)

Chris White

13

Close out notes (A.Blondel, and M.-E .Shewry)

“MICE is not ready to go to the RF superstore to buy a lot of stuff”Need another review when more detailed plan has been established for stepwise testing. Clock ticking with 6-9 month lead time

Final triodes High Power T116 tubes are a concern. Need to review situation regarding Thales tubes with Andrew Taylor. MICE should address issue minimum gradient for studies vs what needed for final measurement

RF system depends extensively on 4 inch coax for which 1MW level testing is needed.Need system test of 1MW RF system (one cavity with whole system) Perhaps RF cavity that is at Fermilab after cavity conditioned at 1.5MW level (or do it at RAL?)

Close out notes (II)

Shield wall: 4616 AMP on top of mezzanine -- is it protected? MICE magnetic fields should have be studied (action to Preece and Courthold)

Need beam physicist (Derun was not there) to have overview of RF system as a whole.

Funding from STFC, MRI + TIARA is complicated and confused (Peter McIntosh)

On controls: individual cavity frequency feedback loop control is needed (see with Derun)

Tune cavities as pairs -- what we lose by design of tuning of individual cavities to middle of range ([ 0.985-1] ) we gain by getting rid of the trombones.

Since there is no condition for step VI put as much of step VI as you can right away !

RF power: next steps

-- important to integrate beam physicist in following discussions: (at least Derun) -- take stock of remarks by reviewers and revisit a few things -- integrate testing plan and re-draw plan -- re-establish schedule

News

Run is taking place (very nice results!)

Aims:0. re-establish target performance and improve including beam bump1: check performance of new TOF photomultipliers2: try to estimate the contamination of pions in the muon beam 2.1 first scan in momentum tof criss-cross to establish response of pions vs muons at given value of TOF 2.2 use KL to identify a clean sample of pions. 3. Verify performance of CKOV and pion muon separation at high momentum4. More checks on e+ e- time of flight difference (reverse solenoid or scan intensity)5. Possibly try to symmetrize momentum distribution by moving pion momentum down6. Possibly do last point of momentum emittance matrix

AGENDA

Next analysis meeting: 22 December 2011

Next Video conference 19 January 2012

Next collaboration meeting: 8-11 february 2012 at RAL

MPB: 8 March 2012

FAC: 19 March 2012

MICE CM31 wrap-up Alain Blondel 18

Some recommendations by MPB in July 2011:Recommendations (MICE is asked to report at the next MPB meeting 8 March 2012 on these)

-Engage Chinese manufacturing partners during CC magnet testing and cryostat construction in the US

- Monitor 2011 Milestones and report to the next project board on their follow up and achievement

- Encourage project to evaluate more thoroughly step IV running

- Continue to recommend priority to be given to RF cavity tests well before commissioning step V to reduce project risks

- Recommend early soak test of RF power sources

- Recommend incorporating enough instrumentation to minimize occurrence and consequences of system-wide magnet quench

NB we don’t have to do everything they say, but we have to take it seriously and report on it.

MICE CM31 wrap-up Alain Blondel 19

Screen preview FOR NEXT MEETING (not exhaustive list)

Spectrometer solenid cold mass is closed and about to be testing.

FC magnet completed (cooled) and in time for delivery end of February

CC drawings review passed. First scenarios for construction of CC magnets

LH2 system tested with Liquid Hydrogen

Results from December run:

-- is CKOV telling pi/mu reliably at 300 MeV/c?

-- is MAUS working on real data?

Analysis group producing results, tracker reconstruction software

Report from Magnetic shielding WG and reference time WG

Establish run plan for step IV!

MICE VC145 15-12-2011 Alain Blondel 20

Next CM will be organized by -- Stefania Ricciardi-- Victoria Blackmore-- Alain Blondel-- Mary- Elizabeth Shewry

-- registration call coming soon