peter mcintosh (stfc daresbury laboratory) 2 nd pasi workshop, ral april 3 - 5, 2013
TRANSCRIPT
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ADVANCED ACCELERATOR TEST FACILITIES AT DARESBURY
LABORATORY
Peter McIntosh (STFC Daresbury Laboratory)2nd PASI Workshop, RAL April 3 - 5, 2013
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• Daresbury Test Facilities:– ALICE:
• SRF Cryomodule R&D• RF Control – Microphonics and Lorenz Detuning
– EMMA NS-FFAG:• Beam Dynamics Studies• RF Control – Vector Sum Architecture
– VELA:• Deflecting Cavity Diagnostics
• Collaborative Opportunities• Conclusions
Overview
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• ALICE at Daresbury Laboratory operates using Energy Recovery principle.
• Only accelerator of its type in Europe.• Used as an R&D test facility for next
generation electron beam technology development.
Booster
Compressor
IR-FEL
Photoinjector Laser
Linac
Acceleration
Deceleration
8 MeV
35 MeV
8 MeV
http://www.stfc.ac.uk/ASTeC/Programmes/Alice/35997.aspx
ALICE ERL Facility
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ALICE Operating ParametersParameter Design Value Operating Value
Gun Energy (keV) 350 320
Injector Energy (MeV) 8.35 7
ERL Energy (MeV) 27 23
Total Beam Energy (MeV) 35 30
RF Frequency (GHz) 1.3 1.3
Bunch Repetition Frequency (MHz)
81.25 81.25/16
Train Length (µs) 0 - 100 0 - 100
Train Repetition Frequency (Hz) 0 - 20 0 - 20
Compressed Bunch Length (ps) <1 rms <1 rms (measured)
Bunch Charge (pC) 80 40/80
Energy Recovery Rate (%) >99 >99 (measured)
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New SRF Cryomodule
• Collaboration formulated in early 2006 to design and fabricate new CW cryomodule and validate with beam.
• Dimensioned to fit on the ALICE ERL facility at Daresbury:– Same cryomodule footprint.– Same cryo/RF interconnects.– ‘Plug Compatible’ with existing
cryomodule.
Parameter Target
Frequency (GHz) 1.3
Cryomodule Length (m)
3.6
R/Q () 762
Eacc (MV/m) >20
Epk/Eacc 2.23
Hpk/Eacc 46.9
CM Energy Gain (MeV) >32
Qo >1010
Qext 4 x 106 - 108
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CM Component Testing
DESY superstructures (7Z2 & 7Z4) modified to incorporate optimised end groups.
Saclay-II tuner with wider aperture and low voltage piezo cartridges, pinned and stress tested.
Modified Cornell ERL injector coupler with a shortened cold section, high
power conditioned.
Cavities, cold couplers and central HOM absorbers installed. Cryomodule assembled & undergoing final cold testing.
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Assembly and Integration
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DLLRF Implementation• LLRF4
– Designed at LBNL by L.Doolittle– Open source– Xilinx spartan 3 FPGA– 4 -14 bit ADC Channels– 2 -14 bit DAC's– USB comms– Clock management chip
• Cost ~$3k, built and tested• System installed in 2011 on NC
buncher cavity.• To also install on SRF cavities:
– 1.3 GHz.– High Q Superconducting Cavities.– 4ms pulse & CW– Fast feedback– Feed Forward for beam loading
compensation.
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Parameter ValueEnergy range 10 – 20 MeV
Lattice F/D Doublet
Circumference 16.57 m
No of cells 42
Normalised transverse acceptance
3 mm
Frequency (nominal) 1.3 GHz
No of RF cavities 19
Average beam current 13 μA
Repetition rate 1, 5, 20 Hz
Bunch charge 16-32 pC single bunch
EMMA NS-FFAG
EMMA is the only accelerator of its type in
the world!
http://www.stfc.ac.uk/ASTeC/Programmes/17426.aspx
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Applications of NS-FFAGs
High power proton driver
Neutrino Factory Proton & Carbon Therapy
Dedicated Muon Source Accelerator driven reactor
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• Fixed energy operation to map closed orbits and tunes vs momentum
• Many lattice configurations
– Vary ratio of dipole to quadrupole fields
– Vary frequency, amplitude and phase of RF cavities
• Map longitudinal and transverse acceptances with probe beam from ALICE
• EMMA is heavily instrumented with beam diagnostics
EMMA Objectives
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IonPump
CavityD Magnet
F Magnet Location for diagnostics
Beam direction
Girder
EMMA 6-Cell Girder Assembly
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YAG Screen YAG
Screen
eBPM x 81
SeptumPowerSupply
KickerPowerSupplies
SeptumPowerSupply
KickerPowerSupplies
EMMA Ring ConfigurationWall Current
Monitor
LLRF
First user of Libera LLRFLocated ~ 30 m from machine
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Realisation of EMMA August 2010
First Turn Second Turn
16th Aug 2010
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Optimising RF for Acceleration• ToF zero crossing of each
cavity to find optimum phase angle.
• Beam loading effects could be seen on Libera system during phase optimisation.
• Possibility to zero cross each cavity, tune for maximum acceleration.
• Close Libera RF control loop to keep track of the correct phase of the system:– phase accumulator is reset
during sweep.
• LLRF control essential in order to achieve successful beam acceleration.
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EMMA Acceleration Achievement
• Successful acceleration in serpentine channel demonstrated.
• Published in Nature Physics (01/03/12)
MeasuredMarch 2011
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VELA – Versatile Electron Linear Accelerator (ex EBTF)
• For the development and testing of novel and compact accelerator technologies.
• Through partnership with industry and the scientific community.
• Aimed at addressing applications in medicine, health, security, energy, industrial processing and science.
• Will enable research into areas of accelerator technologies which have the potential to revolutionise the cost, compactness and efficiency of such systems.
• The main element of the infrastructure:- high performance and flexible electron beam injector facility feeding customised state-of-the-art testing enclosures and associated support infrastructure.
• Critical for development of underpinning technologies; – Advanced Beam Diagnostics, – Accelerating and Dipole Mode RF Structures, – RF Sources and Distribution Systems,– Vacuum Systems, – Magnet Systems,– Beam-based Feedback and Control Systems,– Beam Synchronisation Systems.
VELA Pulsar
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Module 1
Module 2
Module 3
Module 4
Module 5
Module 6
Module 1
Accelerator Modules
http://www.stfc.ac.uk/ASTeC/Programmes/EBTF/38426.aspx
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VELA/CLARA Beam Parameters
VELA (Min) VELA (Max)CLARA
(single spike)Min/Max
CLARA (seeding)Min/Max
Comments
Beam Energy 4 MeV 6 MeV 6 /25 MeV 6 /25 MeV
Magnets in VELA can go up to 25 MeV later for CLARA and some diag devices will be used at this higher energy.
Bunch Charge 10 pC 250 pC 10 pC 250 pC Experimental modes
Bunch length (σt,rms) 80 fs 3 ps35 fs /3ps(@25 MeV)
50 fs /3ps (@25 MeV)
Bunch length changes along the line. CLARA in bunch compression mode. Experimental modes.
Normalised emittance
0.1 m 2.0 m 0.1/1 µm 0.6/3.0 µm CLARA in bunch compression mode. Experimental modes
Beam size (σx,y,rms) 0.1 mm 3.5 mm 0.1/2.0 mm 0.1/4 mm Varies along the beam line
Energy spread (σe,rms) 0.1% 5% ~ 0.1/1 % ~ 0.1/5% Varies along the beam line
Bunch repetition rate 1 Hz 400 Hz TBD TBDKlystron Modulator & Laser 400 Hz
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Transverse Deflecting Cavity Beam Diagnostic
Parameter ValueNumber of cells 9Frequency (MHz) 2998.5Nominal/Maximum RF voltage (MV) 5Nominal/Maximum RF power (MW) 5/6Operating Mode πRepetition rate (Hz) 10Active length (m) 0.5Quality factor (Qo) ~18000Shunt Impedance deflecting mode R (MΩ) 5.0Aperture beam pipe diameter (mm) 35 (Iris 32)
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H-field
E-field
TDC CharacterisationEstimated peak transverse voltage 5 MV (limited by available RF power)
3-cell TDC prototype (RI GmbH)
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VELA Status and Layout
Injector Room Enclosure 2
Rack Room
Synchronisation Room Laser Room
Control Room
First electrons by end April 2013First beams for exploitation July 2013.
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• SRF Cryomodule Operation (ALICE):– CW SRF Cavity Operation:
• Thermal Characterisation– Microphonics Assessment & feedback/forward Control
• NS-FFAG Beam Dynamics (EMMA):– Serpentine Acceleration– RF Control Processes– Slow RF acceleration – Induction techniques?– Magnet Systems (Conventional & SC)
• Deflecting/Crab Cavities (VELA/ALICE/EMMA):– Structure Designs– RF Control Developments
• Vacuum Systems (VELA/ALICE/EMMA)
Collaborative Opportunities
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• Innovative and unique accelerator test facilities available at Daresbury:• ALICE – Europe’s only ERL Facility• EMMA – World’s only NS-FFAG• VELA – High performance beam injector
• Each allow for technology development and/or demonstration.
• Although machines use electrons, compliance exists for proton technologies:• Accelerator Systems• RF Control/feedback/feed-forward/synchronisation• Deflecting/Crab Cavity Systems (Diagnostics/Beam
Manipulation)• Magnets• Vacuum Systems
• Opportunity to explore UK-FNAL collaboration in these (or other) areas.
Conclusions
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THANK YOU!