RF tests of an 805 MHz pillbox cavity at Lab G of Fermilab

Derun Li, J. Corlett, R. MacGill, J. Wallig, M. Zisman, A. Moretti, Z. Qian, V. Wu, R. Rimmer, J. Norem, Y. Torun

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


We report recent high power RF tests on an 805 MHz RF pillbox cavity with demountable windows over beam apertures at Lab G of Fermilab, a dedicated facility for testing of MUCOOL (muon cooling) components. The cavity is installed inside a superconducting solenoidal magnet. A 12 MW peak RF power klystron is used for the tests. The cavity has been processed both with and without magnetic field. Without magnetic field, a gradient of 34 MV/m was reached rather quickly with very low sparking rate. In a 2.5 T solenoidal field, a 16 MV/m gradient was achieved, following several weeks of conditioning. Strong multipacting effects associated with high radiation levels were measured during processing with the magnetic field. More recently Be windows with TiN-coated surface have been installed and tested with and without the external magnetic field. 16 MV/m gradient without magnetic field was reached quickly as planned. Less multipacting was observed during the conditioning, indicating that the TiN-coated surface on the windows had indeed helped to reduce the secondary electron emission significantly. A gradient of 16.5 MV/m was finally achieved with magnet on in solenoidal mode and the field up to 4 T. Preliminary inspection of the Be window surface found no visual damage, in comparison with Cu windows where substantial surface damage was found. Preliminary understanding of conditioning the cavity in a strong magnetic field has been developed. More thorough window and cavity surface inspection is under way.
Original languageEnglish
Title of host publicationProceedings of the IEEE Particle Accelerator Conference
Number of pages3
Publication statusPublished - 1 Dec 2003
Externally publishedYes
EventPAC 2003 - Proceedings of the 2003 IEEE Particle Accelerator Conference - Portland, OR, United States
Duration: 12 May 200316 May 2003


ConferencePAC 2003 - Proceedings of the 2003 IEEE Particle Accelerator Conference
Country/TerritoryUnited States
CityPortland, OR

ASJC Scopus subject areas

  • Engineering(all)


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