- Open Access
Traveling wave resonant ring for electron cloud studies
Phys. Rev. ST Accel. Beams 7, 073501 – Published 26 July, 2004
DOI: https://doi.org/10.1103/PhysRevSTAB.7.073501
Abstract
Within the framework of the CERN program on electron cloud effects in accelerators, a coaxial multipacting test stand was built. In order to simulate bunched beam, the test stand is subjected to short rf pulses. The field strength in a traveling wave mode is sufficient to trigger multipacting in “as received” surfaces, but not in chambers treated to reduce the secondary emission yield. Thus a number of upgrades in the bench setup have been pursued, mainly in two directions. The first one is a general reduction in mismatching (i.e., electrical losses) amongst the different parts of the setup. Secondly, instead of dumping the pulsed power into a load, it is recirculated by means of a broadband working regime resonant ring. This ring required the design of a directional coupler with up to 1 kV dc isolation, very low transmission losses, and a four octave bandwidth. This paper reports on the steps required to build this traveling wave resonant ring (improvements on the chamber and implementation of the coupler) and includes an appendix on the main properties of the setup that relate to electron multipacting studies.
Article Text
References (13)
- O. Grobner, in Proceedings of the Particle Accelerator Conference, Vancouver, Canada, 1997 (IEEE, Piscataway, NJ, 1997), pp. 3589–3591.
- M. Pivi, Ph.D. thesis, University of Torino, 2000.
- V. Baglin, J. Bojko, O. Grobner, B. Henrist, N. Hiilleret, C. Scheuerlein, and M. Taborelli, in Proceedings of the European Particle Accelerator Conference, Vienna, 2000, edited by J. L. Laclar, W. Mitaroff, Ch. Petit-Jean-Genaz, J. Poole, and M. Regler (Austrian Academy of Science, Vienna, 2000), pp. 217–221.
- H. H. Braun, R. Corsini, T. E. D’Amico, J. P. Delahaye, G. Guignard, C. D. Johnson, A. Millich, P. Pearce, A. J. Riche, L. Rinolfi, R. D. Ruth, D. Schulte, L. Thorndahl, M. Valentini, I. Wilson, and W. Wünsch, CERN Yellow Report No. 99-06, edited by R. Corsini, 1999.
- G. L. Matthaei, L. Young, and E. M. T. Jones, in Microwave Filters, Impedance-Matching Networks and Coupling Structures (Artech House, Dedham, MA, 1980), Sec. 14.05.
- F. Ruggiero et al., in Proceedings of the European Particle Accelerator Conference, Stockholm, 1998, edited by S. Myers, L. Liljeby, and C. Petit-Jean-Genaz (Institute of Physics, London, 1999), pp. 359–361.
- U. Iriso Ariz et al., CERN Report No. VAC-TN-01-17, 2001, http://lhc-div-vac.web.cern.ch/lhc-div-vac/VACPAGES/VacuumTechNote/2001/TN_01_17.pdf.
- J. R. Harlan Howe, in Stripline Circuit Design (Microwave Associates, Burlington, MA, 1974), Chap. 5.
- E. G. Cristal and L. Young, IEEE Trans. Microwave Theory Tech. 13, 557 (1965).
- J. H. Billen and L. M. Young, in Proceedings of the Particle Accelerator Conference, Washington, DC, 1993 (IEEE, Piscataway, NJ, 1993).
- O. Zinke and H. Brunswig, in Hochfrequenztechnik I (Springer-Verlag, Berlin, 1973), 2nd ed., Vol. I, p. 100.
- F. Caspers, F-J. Decker, and F. Zimmerman, in Proceedings of the ECLOUD’02 Workshop, Geneva, 2002, edited by F. Ruggiero, G. Rumolo, and F. Zimmermann (CERN Yellow Report, 2002); see also http://wwwslap.cern.ch/collective/ecloud02/index.html.
- F. Caspers, in RF Engineering for Particle Accelerators, edited by S. Turner (CERN, Geneva, 1992), p. 142.
