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The Linac 4 RF System - overview

The Linac 4 RF System - overview. O. Brunner/AB/RF L.Arnaudon, C. Rossi, M. Vretenar, M. Timmins, D. Parchet, P. Baudrenghien,... (Linac4 MAC – Jan’08). RF power layout – boundary conditions. Initial configuration:

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The Linac 4 RF System - overview

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  1. The Linac 4 RF System - overview O. Brunner/AB/RF L.Arnaudon, C. Rossi, M. Vretenar, M. Timmins, D. Parchet, P. Baudrenghien,... (Linac4 MAC – Jan’08)

  2. RF power layout – boundary conditions • Initial configuration: • 13 klystrons 1.3 MW, 6 klystrons 2.5 MW, 3 modulators 1.3 MW, 11 modulators 2.5 MW • Final configuration (at the end of the stock of LEP klystrons, if allowed by cavity stability): • 3 klystrons 1.3 MW, 11 klystrons 2.5 MW, 3 modulators 1.3 MW, 11 modulators 2.5 MW • future upgrades: • LP(SPL), SPL

  3. Layout – RF power building • klystron racks (local control): • focus p.s., power meters, temp measurements, RF drive amplifiers...) • space for additional PIMS & power equipment: • equipment must be integrated now.. PIMS CCDTL DTL • Faraday cages: • Low level • Main PLC • diagnostic RFQ Power converters (enough space for SPL needs) M. Timmins

  4. Layout – close look (PIMS) • Very dense • can everything be installed? • hope to get ride of klystron garages (local shielding only) • Need detailed 3D integration: • supports • cable trays • water cooling • phase shifters needed? M. Timmins

  5. Layout – waveguides • Very tight • no margin to adjust WG length • RF power layout imposed by RF elements in the machine • RF & control cable • 2 passages/WG hole M. Timmins

  6. Status Equipment • Available: • more than 25 1MW LEP klystrons • Thales/EEV/Philips/Valvo • 5 – 35khours • Issue: HV connections (power converter to klystron)? • about 20 1MW LEP Circulators • AFT/ANT • Need new TCU (temperature control unit) • most of waveguides (except HH bends) • To be purchased: • 6 2.6MW klystrons (+spares) • 6 2.6MW circulators (+spares) • 13 1MW RF ferrite loads (+spares) • 12 2.6MW RF ferrite loads (+spares) • 140 HH waveguides bends • RF drivers, focus power supplies etc • simulation to be done: • half height WG ok @ 1MW? • full height WG (magicT’s) ok @ 2.6MW?

  7. Operation of the LEP CW Klystrons in pulsed mode • tests were made in 2002 to show that LEP klystrons could be re-used for future proton linacs (H. Frischholz&D. Valuch) • condition of test: • LEP modified modulator (in order to pulse HV) • RF pulse-lengths of 5 ms • pulse repetition rate of 50 Hz • peak power level of 850kW • will be tested soon in 3MeV test stand (see C. Rossi’s talk) • influence on cathode lifetime? (M-type cathodes) • 10kV between pulses? • reliability? Shape of the RF pulses

  8. new 2.6MW RF power equipment • 2.6MW klystrons: • contacts with Thales / CPI / Toshiba • preliminary design specifications: • frequency: 352MHz • peak power: 2.6MW • duty cycle: 5% • RF pulse width: 1ms • beam voltage: 110kV • beam current: 50A • RF gain: 35 – 37 dB • DC -> RF efficiency: 45 – 50% • klystron heater? • power converter – klystron cabling? • delivery time: • 12-14 months after the order is placed • delivery schedule (LHC): 1 tube/2months • 2.6MW circulators and RF loads • contacts with AFT • delivery time (6-8 months after the order is placed)

  9. Interlock module Slow Controls Structure • based on LHC RF control system • “proto” installed in 3MeV test stand L. Arnaudon

  10. conclusions • RF power integration: • lots of work done: overall layout looks fine (Faraday cages, RF power, WG, racks, cable routing) • basically compatible with future upgrades (for SPL) • need detailed 3D integration of: • RF power equipment for the PIMs • WG support system (from surface to machine) • cable routing (from RF structure to Faraday Cage) • additional PIMS & related equipment • is it ok to feed 2 RF structure with 1 klystron? do we need “active” phase shifters? • RF power equipment • 1.3MW system: tests will start soon in 3MeV test stand • 2.6MW RF system: • final specs to be written / call for tender / order to be placed • need simulation of the WG system, in particular for the Magic’T • slow control system • based on LHC slow control system • “proto” ready for the 3MeV test stand

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