MuCool Test Area RF Workshop

Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory November 15, 2010

MAP RF Goals

Develop a workable solution for high gradient NCRF operating in B fields between approximately 3 and 6 T.

Support sub-assembly prototyping for the 6D cooling bench test.

1. Guggenheim 2. FOFO Snake 3. HCC MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 2

Workshop Goals

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Review the status of the MTA RF programs Review proposed future RF programs Discuss RF R&D strategy to respond to the comments and recommendations from the MAP Review in August 2010

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Scope of the work of MAP RF proposal

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Resources

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Schedule and milestones

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Concerns/Risks MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 3

Current RF Programs

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Targeted R&D programs to understand the RF breakdown problems in magnetic fields

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a workable solution

— Physics models and numerical simulations, — Experimental programs and new techniques at 805 and

201 MHz

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The 805-MHz with RF buttons

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High pressure cavity

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ALD to eliminate field emission

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Be wall cavity

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Box cavity to study E x B effects

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Magnetic field insulated cavity

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Physics model to understand RF breakdown in magnetic fields MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 4

Future RF Programs

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Magnetically insulated box cavity Beam test of HPRF cavity The 805-MHz RF button tests (Be) Update design of 805-MHz cavity Dielectric loaded cavity Design and fabrication of Be-wall cavity ALD processed buttons in pillbox cavity

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201-MHz cavity test with coupling coil magnet at MTA Complete MICE 201-MHz cavity

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Single cavity vessel MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 5

Comments from the MAP Review

More cavities and tests International RF Workshop

MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 6

Comments from the MAP Review

Concerns on beryllium

MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 7

RF Recommendations from MAP Review

MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 8

In respond to the MAP Review

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Update RF proposal

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Revisit previous plans + this WS

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Schedules and milestones

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Exploring more RF tests in magnetic fields

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Design and build more cavities + RF tests

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SLAC group: 2-T SC magnet and tests at s- or x-band frequencies

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International workshop on high-gradient RF cavities Wish we have a productive workshop MTA RF Workshop, D. Li, Lawrence Berkeley National Lab, November 15, 2010 9