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With KEK Most promising is RFQ – J-PARC design is almost exactly what we need.

Collaboration prospects on 325MHz front end. Possible Areas of the collaboration include:. With KEK Most promising is RFQ – J-PARC design is almost exactly what we need. Possibility of copying JPARC DTL, SDTL. Chopper, bunchers, diagnostics for MEBT also of interest With ANL

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With KEK Most promising is RFQ – J-PARC design is almost exactly what we need.

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  1. Collaboration prospects on 325MHz front end Possible Areas of the collaboration include: • With KEK • Most promising is RFQ – J-PARC design is almost exactly what we need. • Possibility of copying JPARC DTL, SDTL. • Chopper, bunchers, diagnostics for MEBT also of interest • With ANL • Linac low energy end – RT resonators, focusing, beam dynamic simulation, • finally baseline design and options. • Single, double and triple spoke SCRF resonators. Cavity designs go first, beam • dynamic iteration with RT part, optimization, finally baseline lattice. • Next-generation test cryostat for spoke resonators (for both SMTF & RIA/ANL) • NIU (Court Bohn et al.) seems to be enthusiastic about helping out with anything • that gets 325 MHz beam going in SMTF ASAP. Have access to non-DoE • funding sources for collaborations with ANL and FNAL. • Other SMTF collaborators including MSU on 1300 beta<1 cavities, simulations,… Gennady Romanov

  2. Structure Type 4 vane 4 vane Total Length 3.723 m 3.115 m RF Frequency 402.5 MHz 324 MHz Input Energy 65 keV 50 keV Output Energy 2.5 MeV 3.0 MeV Peak output Current 56 mA 30 mA Design Transmission > 90 % Rms Beam Size 0.7 mm Norm. H rms Emittance 0.156 mm mrad Norm. V rms Emittance 0.156 mm mrad Vane-to-vane Voltage 83 kV  82.9 kV Peak Field 1.85 kilpatrick Total Peak RF Power 800 kW 484 kW (336+148) Beam loading 17 % @ 56 mA RF Duty Factor 6.2% 3% (600s  50 Hz) Rep. Rate 60 Hz 50 Hz Vacuum < 1 10-6 Torr RFQ design parameters J-PARC SNS J-PARC is closer to our requirements Gennady Romanov

  3. Contact persons & possible Collaboration Projectsat KEK / JPARC • Ioshi Yamazaki • Akira Ueno (RFQ) • Fujio Naito (DTL, SDTL) Gennady Romanov

  4. We asked KEK for technical documentation including RFQ drawings. We might just correct them if needed, place an order in industry and save a lot of time and effort. KEK plans to replace their 30mA RFQ with a new 50 mA design. Their future plans for the 30 mA RFQ are unknown. Might it be possible to re-tune it from 324 MHz to 325 MHz? Gennady Romanov

  5. Contact persons & possible Projects at ANL • Peter Ostroumov ( general accelerator physics, beam dynamic simulation. • Ken Shepard ( SC accelerating resonators) • Ken will be supervising a graduate student from University of Illinois / Urbana Champaign who will be doing his thesis on pulsed-mode operation of RIA-type resonators as they would be used for Proton Driver. • Joel Fuerst (cryogenics) • FNAL & ANL are interested in co-producing two copies of a next-generation test cryostat for spoke resonators. (one for Meson Lab, one for ANL/RIA) Gennady Romanov

  6. Front end based on DTL J-PARC lattice SSR 3-28 Mev 16 m 2 cryostat 1.6 MeV/m Base DTL 3-36 MeV 18 m 2 tanks 1.83 MeV/m two klystrons (for 50 mA) Proposal  = 0.27, DSC ->  = 0.4 27 m or DSR, TSR, Tesla1, Tesla SSR, DSR, TSR, Tesla1, Tesla Gennady Romanov

  7. 24 Individual Resonators DTL Input energy, 3.0 MeV 3.0 MeV Output energy, 15 MeV 19 MeV Rf power to copper Less than 500 kW 1.06 MW Focusing SC solenoids in individual cryostat Can be HTC cable Electromagnetic quads, can be replaced by SNS type permanent magnets Fabrication Cost, each cavity is ~$40K, each SC solenoid with power supply is ~$40K About $2M+ the cost of rf power distribution system. The power distribution system is the same as for SC resonators. Do not know Operational cost Should be cheaper than DTL option Longitudinal beam dynamics Well optimized Well optimized Transverse beam dynamics Better fits to the following SC lattice Provides easy transition to axial symmetric focusing with short focusing length Front end based on individual RT resonators P.N.Ostroumov. Focusing by SC solenoids in indi- vidual cryostats. CH-cavity – possible candidate Gennady Romanov

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