1 paul drumm; Jan’05; MICE RF Needs MICE RF Power Paul Drumm ISIS Facility Rutherford Appleton Laboratory & MICE

paul drumm; Jan’05; MICE RF Needs 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

paul drumm; Jan’05; MICE RF Needs 3 The Neutrino Factory      e    e + Decay         Japan Europe USA Factor of 10 in performance

paul drumm; Jan’05; MICE RF Needs 4 MICE 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 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

paul drumm; Jan’05; MICE RF Needs 5

6 RF Module Overview SC Coil

paul drumm; Jan’05; MICE RF Needs 7 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)

paul drumm; Jan’05; MICE RF Needs 8 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

paul drumm; Jan’05; MICE RF Needs 9 LBNL Circuits TH170 amplifier

paul drumm; Jan’05; MICE RF Needs driver & test stand Burle willing to refurbish/ make 4th

paul drumm; Jan’05; MICE RF Needs 11 2 MW Amplifier Master Oscillator Controls etc 201 MHz Cavity Module 2 MW Amplifier 201 MHz Cavity Module CERN 300 kW Amplifier HT Supplies Los Alamos HT Supplies ASTeC 2 MW Amplifier LBNL

paul drumm; Jan’05; MICE RF Needs 12

paul drumm; Jan’05; MICE RF Needs 13

paul drumm; Jan’05; MICE RF Needs 14 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

paul drumm; Jan’05; MICE RF Needs 15 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

paul drumm; Jan’05; MICE RF Needs 16 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