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MICE RF Power

MICE RF Power. Paul Drumm ISIS Facility Rutherford Appleton Laboratory & MICE. 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

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MICE RF Power

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  1. MICE RF Power Paul Drumm ISIS Facility Rutherford Appleton Laboratory & MICE

  2. 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

  3. The Neutrino Factory p+ m+ + nm m+ ne + nm + e+ Factor of 10 in performance Decay USA Europe Japan

  4. MICE m Detectors SC-Solenoid Cryogenic Absorber RF -Cavities Diffuser EU design study 44/88 MHz; US design study 201 MHz MICE Reproduces part of study II channel: 201 MHz Bz • 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.

  5. RF Module Overview SC Coil

  6. Baseline specification • 201 MHz • 8 cavities in 2 modules • Each cavity is isolated by Be windows • In principle each cavity is independent (f,f) • Cavities operated in a magnetic field ~few T • 4 cavities replace energy lost in one absorber • ~10 MV/m DE~10 MeV • >1 MW power per cavity • Pulse duty cycle ~ 1:1000 (1ms/1s)

  7. 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

  8. LBNL Circuits TH170 amplifier

  9. 4616 driver & test stand Burle willing to refurbish/ make 4th

  10. Master Oscillator Controls etc Los Alamos CERN HT Supplies 300 kW Amplifier 300 kW Amplifier 300 kW Amplifier 300 kW Amplifier 2 MW Amplifier 2 MW Amplifier 2 MW Amplifier 2 MW Amplifier HT Supplies LBNL ASTeC 201 MHz Cavity Module 201 MHz Cavity Module

  11. 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

  12. 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

  13. 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

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