Phys. Rev. ST Accel. Beams 8, 072001 (2005) [6 pages]Effects of high solenoidal magnetic fields on rf accelerating cavitiesSee Also: Publisher's Note
We have measured the effects of high (0–4.5 T) magnetic fields on the operating conditions of 805 MHz accelerating cavities, and discovered that the maximum accelerating gradient drops as a function of the axial magnetic field. While the maximum gradient of any cavity is governed by a number of factors including conditioning, surface topology and materials, we argue that J×B forces within the emitters are the mechanism for enhanced breakdown in magnetic fields. The pattern of emitters changes over time and we show an example of a bright emitter which disappears during a breakdown event. We also present unique measurements of the distribution of enhancement factors, β, of secondary emitters produced in breakdown events during conditioning. We believe these secondary emitters can also be breakdown triggers, and the secondary emitter spectrum helps to determine the maximum operating field. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.8.072001
DOI:
10.1103/PhysRevSTAB.8.072001
PACS:
29.17.+w, 52.80.Vp, 73.22.−f
See AlsoPublisher's Note: A. Moretti, Z. Qian, J. Norem, Y. Torun, D. Li, and M. Zisman, Publisher’s Note: Effects of high solenoidal magnetic fields on rf accelerating cavities [Phys. Rev. ST Accel. Beams 8, 072001 (2005)], Phys. Rev. ST Accel. Beams 8, 099901 (2005). |
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.