1 / 7

Dual Mode Cavity for Testing Effects of RF Magnetic field on Breakdown Properties A. Dian Yeremian, Valery Dolgashev, S

Dual Mode Cavity for Testing Effects of RF Magnetic field on Breakdown Properties A. Dian Yeremian, Valery Dolgashev, Sami Tantawi SLAC National Accelerator Laboratory. Many thanks to Sami Tantawi for inspiring the work. . US High Gradient Research Collaboration Workshop 2011

landry
Download Presentation

Dual Mode Cavity for Testing Effects of RF Magnetic field on Breakdown Properties A. Dian Yeremian, Valery Dolgashev, S

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dual Mode Cavity for Testing • Effects of RF Magnetic field on Breakdown Properties • A. Dian Yeremian, Valery Dolgashev, Sami Tantawi • SLAC National Accelerator Laboratory Many thanks to Sami Tantawi for inspiring the work. US High Gradient Research Collaboration Workshop 2011 February 9-10, 2011 SLAC National Accelerator Laboratory

  2. History • Dedicated experiments to determine effects of RF magnetic fields on RF breakdown in waveguides showed that when magnetic fields is increased in place of peak electric fields, this decreased the breakdown limit. • V. A. Dolgashev and S. G. Tantawi, "RF Breakdown in X-band Waveguides", • Poc. of EPAC 2002, Paris, France, 2002, 2139-2141. • During NLC program we discovered that moderate electric field at same location as high magnetic fields (at sharp edges of accelerating structure couplers) leads to “magnetic breakdowns”. • V. A. Dolgashev, "High Magnetic Fields in Couplers of X-band • Accelerating Structures,” Proc. of IEEE PAC 2003, Portland, Oregon, • 2003, pp. 1267-1269, SLAC-PUB-10123. • 3. We discovered that breakdown rate is highly correlated with peak pulse heating in single-cell-SW structures of disc-loaded waveguide type, made of soft copper. • V. Dolgashev, S. Tantawi, Y. Higashi, B. Spataro, “Geometric dependence of • radio-frequency breakdown in normal conducting accelerating structures”, • Appl. Phys. Lett. 97, 171501 (2010); doi:10.1063/1.3505339 (3 pages)

  3. Motivation We propose to study effect of rf magnetic field on accelerating gradient in geometry as close as practical to a standing wave accelerator cell. S. Tantawi, "Experimental Evaluation of Magnetic Field Effects on Breakdown Rates", CERN Breakdown Physics Workshop, May 2010

  4. RF Electric and Magnetic Fields for 1MW Input Power TM01 mode TE01 mode Electric field Electric field RF in RF in Magnetic field Magnetic field RF in RF in A.. D. Yeremian, V. A. Dolgashev, S. G. Tantawi 2011

  5. S-parameters vs. Frequency A.. D. Yeremian, V. A. Dolgashev, S. G. Tantawi 2011

  6. Surface Magnetic and Electric fields normalized to 1 MW of Input Power TE Magnetic field TM Magnetic field TM Electric field to choke A.. D. Yeremian, V. A. Dolgashev, S. G. Tantawi 2011

  7. Summary We designed a dual mode cavity with geometry as close as practical to a Standing Wave accelerator cell in order to study effects of rf magnetic fields on rf breakdown rate. We plan to build it and test at ASTA.

More Related