1 paul drumm; jan’05; mice rf needs mice rf power paul drumm isis facility rutherford appleton...
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1paul drumm; Jan’05; MICE RF Needs
MICE RF Power
Paul DrummISIS Facility
Rutherford Appleton Laboratory&
MICE
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MICE
• Cost/Efficiency of the Neutrino Factory– Cannot be done without a demonstration of
ionisation cooling;– Essential for a muon collider– Accelerator aperture is a strong cost driver– Ionisation cooling reduces transverse beam
emittance
• MICE = Cooling Channel Demonstration
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The Neutrino Factory
e e +
Decay
Japan
Europe
USA
Factor of 10 in performance
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MICE
DetectorsSC-SolenoidCryogenic AbsorberRF -Cavities Diffuser
EU design study 44/88 MHz; US design study 201 MHzMICE Reproduces part of study II channel: 201 MHz
• to design, engineer, and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory;• to place this apparatus in a muon beam and measure its performance in a variety of modes of operation and beam conditions.
Bz
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RF Module Overview
SC Coil
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Baseline specification
• 201 MHz• 8 cavities in 2 modules• Each cavity is isolated by Be windows
– In principle each cavity is independent (f,)
• Cavities operated in a magnetic field ~few T• 4 cavities replace energy lost in one absorber
– ~10 MV/m E~10 MeV
• >1 MW power per cavity• Pulse duty cycle ~ 1:1000 (1ms/1s)
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Solutions
• Cost estimate for MICE ~£3M for 8MW
• MICE Strategy:– 201 MHz typical on (old) linacs– ISIS, CERN, LBNL, Los Alamos, BNL, KEK!– 2x2MW amplifiers from LBNL (at DL)– 2x2MW amplifiers from CERN– 3x300kW amplifiers from LBNL– Power supplies promised by Los Alamos– Procure missing parts
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LBNL Circuits
TH170 amplifier
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4616 driver & test stand
Burle willing to refurbish/make 4th
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2 MW Amplifier
Master OscillatorControls etc
201 MHz Cavity Module
2 MW Amplifier
2 MW Amplifier
201 MHz Cavity Module
CERN300 kW Amplifier
300 kW Amplifier
300 kW Amplifier
300 kW Amplifier
HT Supplies
Los Alamos
HT Supplies
ASTeC
2 MW Amplifier
LBNL
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ISSUES for MICE R&D
• Old Tubes – Future supply uncertain– 116 ex ISIS– 170 ex CERN– 4616 still available
• Output power levels – limitations of circuits
• 8 Cavities fed from 4 amplifiers– Cavity interactions, reflected power, stability– Circulators– Hybrids
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MICE Tasks
• Refurbishing & Recommissioning existing kit• Procure missing items
– New– In house build– Beg, borrow (steal held in reserve)
• Aim to assemble at least one complete system as a test stand over next two FYs
• Future task – 4 power systems/8 cavities– MICE potential test bench for power sources
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Effect of Stong Magnetic Fields
RF dark currents were measured at Fermilab on 805 MHz cavities in magnetic field
Extrapolation to 201 MHz uncertain tests on 201 MHz prototype 2005 Environmental issue for MICE