Transcript NEWS and RF review MICE VC145 15-12-2011 Alain Blondel MICE RF power Review 7 December 2011 Reviewers Ralph Pasquinelli Kevin Ronald Pete McIntosh Mark Keelan Mike Woodward Erk.

NEWS and RF review
MICE VC145 15-12-2011 Alain Blondel
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MICE RF power Review 7 December 2011
Reviewers
Ralph Pasquinelli
Kevin Ronald
Pete McIntosh
Mark Keelan
Mike Woodward
Erk Jensen
Fermilab
Strathclyde
STFC DL
STFC RAL
STFC RAL
CERN – By phone
Presenters
Andy Moss (DL) RF power station
Alan Grant (DL) RF layout
Steve White (DL) RF controls
Review Charge
To 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
Principle
Andy Moss
Andrew Moss
6 1/8” t0 4 1/16”
Coax Transition
Reality
6 1/8” Matched Tee
Flexible line
section
Dual Directional
Coupler
4 1/16” Coax
Section
MTA with 201MHz MICE cavity on test
Slides courtesy of Al Moretti, Fermilab
Andy Moss
PhotoMultiplier
Vacuum RF
Coupler Loop
Andrew Moss
Alan Grant
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RF Layout – view behind shield wall
RF Layout – view from cooling channel side
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Alan Grant
Predicted hall layout for RF components
Comment: 4 Amplifiers go to 8 cavities
A1  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 phase
at driver level without the cumbersome trombones
Andy Moss
Andrew Moss
Access & Egress
Amplifier cannot be lifted.
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
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Alan Grant
RF HV Power Supplies - Components
HV PSU Control Unit
TH116 Circuit (lower part)
20 kV PSU & Aux. rack – front view
38 kV PSU – rear view
38 kV PSU – 1 MW RF output
38 kV PSU – resistor bank
Chris White
MICE RF Design Review December 2011
Crowbar (38 kV Thyratron)
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RF Control & Monitoring System
EPICS Server
4616 & TH116
Aux. Racks
Network/
Controls Rack
VME Crate
Digital signals/serial link
Digital signals/serial link
PLC Crate
(TH116)
Interlocks
PLC Crate
(4616)
Interlocks
Typical I/L
Compressed air
pressure
Water flow
Panel switches
Analog signals
Grid PSU
(4616)
Enable
Analog signals
Screen PSU
(4616)
Enable
Heater
Controller
(4616)
Enable
Heater
Controller
(TH116)
Enable
Canbus
modules
DAC/ADC
modules
Analog & digital signals
Analog & digital signals
Analog & digital signals
Heater V and I
Heater V and I
Enable
450V DC
Bias PSU
MICE RF Design Review December 2011
Chris White
Interlocks
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Timescale
Current work in progress:
• RF testing of System #1 with new 4616 and TH116 tubes
Future work (Step V): time-scales to be confirmed
• Assembly of CERN TH116 amplifier (System #2) ---------------------• Test CERN amplifier at Daresbury ----------------------------------------• Develop RF Control Systems
• Pack & ship complete system #1 to RAL --------------------------------• Install RF System #1 in MICE Hall ----------------------------------------• Test complete RF system #1 at RAL -------------------------------------• 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
Nov 11 to Dec11
(July 2012)
(December 2012)
(January 2013)
(May 2013)
(September 2013)
Tasks in red are required for TIARA (deadline in brackets)
MICE RF Design Review December 2011
Chris White
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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?)
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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 bump
1: check performance of new TOF photomultipliers
2: 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 momentum
4. 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 down
6. 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
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
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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 CM31 wrap-up Alain Blondel
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Next CM will be organized by
-----
Stefania Ricciardi
Victoria Blackmore
Alain Blondel
Mary- Elizabeth Shewry
-- registration call coming soon
MICE VC145 15-12-2011 Alain Blondel
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