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MICE RF Power Status

MICE RF Power Status. Paul Drumm ~ Sunday August 1 st 2004. Progress since CM8. Workshop at CERN in May Meeting & Talking exercise Established need for a “balanced” design Merits of 4x”2MW” vs. 2x”2MW”+1x”4MW” 4MW amplifier was unlikely to be possible

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MICE RF Power Status

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  1. MICE RF Power Status Paul Drumm ~ Sunday August 1st 2004

  2. Progress since CM8 • Workshop at CERN in May • Meeting & Talking exercise • Established need for a “balanced” design • Merits of 4x”2MW” vs. 2x”2MW”+1x”4MW” • 4MW amplifier was unlikely to be possible • A 4MW amplifier would require a higher anode voltage and 2 loops; the installation of a Kapton anode blocker (expensive & risky). • 4x”2MW” less risk; less work; no more cost; • Providing 2 circuits at 2 MW would be less risky and easier. • Agreed Scheme to power eight Cavities

  3. From this… Master Oscillator 2 MW Transmitter 2 MW Transmitter 4 MW Transmitter 201 MHz Cavity Module 201 MHz Cavity Module

  4. Overall Picture 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 Daresbury 201 MHz Cavity Module 201 MHz Cavity Module

  5. Sources of Equipment • CERN • Two power Amplifiers (MW) • Driver amplifier (kW) • Some heater control circuits • KEK • Potential circuits available (MW & kW) • No discussions yet – timescale uncertain • LBNL • Two power amplifiers (MW) • Three driver amps (kW) • MoU in progress • Los Alamos • HT supplies; many smaller supplies; • Draw up MoU; • ISIS • Stock of Ex ISIS tubes

  6. Position on Tubes (Triodes) • Ex ISIS TH116 • Removed at 2.3MW output (50Hz, ?ms) • New TH116 • “4.8MW” (4MW) not available • New TH170 – 2.3MW available to buy • expect 2.8 MW from tube; • no spares • 1ms, 0.02% TH628 Diachrode 4.5 MW, 0.5ms @1%

  7. Current State of Design • Electrical Engineering details being evaluated: • DL • to produce a revised MICE RF cost estimate; • CERN • to produce a new cost estimate for CERN work to be borne by MICE. • The work has to be discussed with CERN management (AB).

  8. …via this…

  9. Potential Capabilities • Each power circuit • 2.X MW tube • Some losses in transmission and coupling • One circuit  One Cavity @ Stage V • Expect 2 MW in each cavity • One circuit  Two Cavities @ Stage VI • Expect >1 MW in each cavity • Additionally, by sacrificing lifetime: • Could deliver >2 MW into one cavity x 4 • Do not (yet) have the option of 4 MW x 8 cavities • May be some possibility in the future…

  10. Work Plans in UK • Currently in the process of Packing up for shipment to Daresbury • Strip down and assess work required to refurbish • RF connections (finger strip) • Clean surfaces (steam cooled) • Funding allowing • like to build a test stand for full power test • 2 MW System into a load • Hall and facilities available • Need to have got through GW2 • i.e. be in full funding mode

  11. Work Plans @ CERN • Plan to restore/refurbish “88MHz” system to useable state at 201 MHz • Blueprint for rebuild of “derelict” 201 MHz Circuit • Timescale? • Question of 88 MHz test for NF? • Probably release by end of year • Possibly mid-to-late 2005 • depends on funds; people availability • It is likely that the future NF work programme will concentrate on the Target and Horn work, and the bunch rotation test should be completed by the end of 2004 or should probably be abandoned in as much as MICE could be a higher priority.

  12. Selected R&D Issues • Non of the options come with a guarantee • CERN circuits will be untested • TH170 amplifier • limited to 1.8MW  design of output circuit • TH116 amplifiers • Question of lifetime and output power • TH170 & TH116 Socket Compatible • different characteristics (heaters etc) • Losses in the circuits (8 Cavities) • to obtain 1MW/cavity would require 4x2.5 MW in “2MW” amplifier • (or 2x5MW in a “4MW” amplifier – not reachable) • Phase and Amplitude Control • ± 0.5 degrees and ± 1% • Simulation?

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