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Gaseous H 2 Absorber Status IIT and Muons, Inc.

This report covers the status of absorber development for ionization cooling channels in particle accelerators, focusing on high-voltage RF cavity testing using gases as absorbers. It details the goals, success measures, requirements, and current status of the RF test cell assembly.

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Gaseous H 2 Absorber Status IIT and Muons, Inc.

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  1. Gaseous H2 Absorber StatusIIT and Muons, Inc. Chuck Ankenbrandt, Ed Black, Kevin Cassel, Bob Hartline, Rol Johnson, Dan Kaplan, Moises Kuchnir, Al Moretti, Milorad Popovic 2 SBIR/STTR proposals (phase I $100k, phase II $750k/$500k) submitted on 1/15/2002 Absorber Review/GH2 status

  2. Bad News, Good News 20b. Gaseous Energy Absorber Conceptual Design----Rejected, but 21a. High Pressure RF Cavities Funded for $100k as an STTR phase 1 for 9 months starting 7/22/02. (MUCOOL note 247 is the proposal) Absorber Review/GH2 status

  3. 21a 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. Absorber Review/GH2 status

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

  5. 21a 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. Absorber Review/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 Absorber Review/GH2 status

  7. Test Cell Requirements • Safe (pressure, ODH, x-rays, HV) • Robust and Versatile • open many times • change electrodes • good for H2 • Instrumented • T, P, spark, RF parameters Absorber Review/GH2 status

  8. RF test cell assembly Absorber Review/GH2 status

  9. RF test cell plan view Absorber Review/GH2 status

  10. Present Status • Basic test-cell system designed • Conflat blanks, keg cryostat, simple Cu cylinder • Designing/Testing RF, HP seals • Copper or Indium seals, knife-edge or groove • Designing/Testing RF feedthrough designs • ceramic or epoxy, parallel or conical (hydrostatic, pneumatic, cryo tests soon) • Defining procedures • safety, construction, measurements (may start 10/1/02) Absorber Review/GH2 status

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