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Gaseous Energy Absorber and Pressurized RF Cavity Development IIT and Muons, Inc.

Gaseous Energy Absorber and Pressurized RF Cavity Development IIT and Muons, Inc. Chuck Ankenbrandt * , Ed Black, Kevin Cassel, Bob Hartline, Rol Johnson, Dan Kaplan, Moises Kuchnir * , Al Moretti * , Milorad Popovic * , Aleks Obabko * Fermilab Consultants. Muons, Inc.: Present Status.

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Gaseous Energy Absorber and Pressurized RF Cavity Development IIT and Muons, Inc.

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  1. Gaseous Energy Absorber and Pressurized RF Cavity DevelopmentIIT and Muons, Inc. Chuck Ankenbrandt*, Ed Black, Kevin Cassel, Bob Hartline, Rol Johnson, Dan Kaplan, Moises Kuchnir*, Al Moretti*, Milorad Popovic*,Aleks Obabko *Fermilab Consultants MUCOOL/GH2 status

  2. Muons, Inc.: Present Status High Pressure RF Cavities Funded for $100k STTR phase 1 for 9 months starting 7/22/02. (MUCOOL note 247 is the proposal). Ph 2 proposal due 3/2003. GH2 Absorber for Muon Cooling Conceptual Design Proposal to be Resubmitted 1/15/2003. HP RF for Acceleration and 6D Cooling Development Proposal in first stages. MUCOOL/GH2 status

  3. STTR Project Goal Unlike any previous particle accelerator, muon beams in an ionization cooling channel are not only allowed but are required to be accelerated through an energy absorbing material. This proposal is to develop very high voltage RF cavities by filling them with cold, pressurized helium or hydrogen gas, which also acts as the energy absorber, to suppress high-voltage breakdown. MUCOOL/GH2 status

  4. H2 Paschen Data exist up to P=25 Atm,V=28 MV/m MUCOOL/GH2 status

  5. STTR Phase I Goal To build an RF test cell for testing breakdown characteristics of gases for ionization cooling. The test cell will allow the exploration of Paschen’s Law, relating breakdown voltages to gas density, over a range of temperatures, pressures, external magnetic fields, and ionizing particle radiation at Lab G and the Linac Test Area. MUCOOL/GH2 status

  6. Measures of Phase 1 Success • Paschen curve measurements for Helium • 805 MHz breakdown vs. gas density • At 300K and 80K (LN2) • Pressures up to 100 Atmospheres • Be ready to do the same for Hydrogen • This should increase probability for phase 2 • Also for resubmission of rejected phase 1 MUCOOL/GH2 status

  7. Accomplishments so far • Developed Pb-Sn solder HP, RF Seal (after trying knife-edges on Cu conflat gasket) 6” SS flanges • Hydrostatic(HS) to 3500 PSI • He to 1800 PSI, 3 cycles to 300K to 80K 12” SS flanges to 1400 PSI HS 6” SS-Cu-SS sandwich to 3500 PSI HS • Developed 1 5/8” coax epoxy feedthrough Hydrostatic to 3000 PSI MUCOOL/GH2 status

  8. MUCOOL/GH2 status

  9. MUCOOL/GH2 status

  10. MUCOOL/GH2 status

  11. Present Activities • TC and feedthrough design, construction • Safety calculations and tests for He and H2 • Test Cell too small to be pressure vessel • Class 0 flammable gas hazard • Defining/documenting procedures • Operation, measurements • Collecting apparatus for RF tests 12/2002 MUCOOL/GH2 status

  12. 805 MHz RF test cell schematic MUCOOL/GH2 status

  13. Future Plans Prepare phase 2 STTR proposal. get good Lab G measurements. prepare work plan (Lab G & MTA). Improve, resubmit GH2 Absorber proposal. Prepare HP RF acceleration proposal. MUCOOL/GH2 status

  14. Hopes for HP RF • Higher gradients than with vacuum • Less dependence on metallic surfaces • Dark currents, x-rays diminished • Easier path to closed-cell design • Hydrogen cooling of Be windows • Use for 6D cooling and acceleration • HV breakdown ~P1.5 , dE/dx~P • Higher P, more excess for wedges or acceleration MUCOOL/GH2 status

  15. Regions of Interest for High Pressure Gaseous Hydrogen Cooling Channels MUCOOL/GH2 status

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