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  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

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

Overall Picture 2 MW Amplifier Master Oscillator Controls etc 201 MHz Cavity Module 2 MW Amplifier 201 MHz Cavity Module LBNL CERN 300 kW Amplifier HT Supplies Los Alamos HT Supplies Daresbury

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

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,

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).

…via this…

Potential Capabilities Each power circuit –2.X MW tube –Some losses in transmission and coupling –One circuit  One Stage V Expect 2 MW in each cavity –One circuit  Two 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…

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

Work 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.

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?