Report/Contribution to a conference proceedings

PUBDB-2016-02917

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigation of a High-Q Dipole Mode at the TESLA Cavities

Baboi, N. (Corresponding author)DESY* ; Dohlus, M.DESY* ; Magne, C. ; Mosnier, A.Extern* ; Napoly, O. ; Glock, H. W.Extern*

2000
DESY Hamburg

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Please use a persistent id in citations: doi:10.3204/PUBDB-2016-02917

Report No.: DESY-M-00-04K

Abstract: Higher order modes (HOM) can have a destructive influence on the beam emittance in the future linear colliders. Therefore it is important that the quality factor of the high impedance modes be damped under a safe level. Although attentive care was taken in designing the superconducting 9-cell cavities and the HOM couplers for the TESLA collider, a high Q and high impedance mode was discovered in some cavities at the TESLA Test Facility (TTF). In order to discover the reason for which this particular mode is very little damped, a series of investigations have been carried out. The mode frequency is higher for the studied cavities comparatively to others, where this mode seems to be properly damped. Field distribution measurements at the separate cavities show a quasi-trapping of the mode. The simulations andmeasurements done at individual cavities show that for certain boundary conditions the field is minimum at the location of both HOM couplers in a tube.

Keyword(s): talk: Vienna 2000/06/26 ; electron positron: linear collider ; linear collider: proposed ; RF system: superconductivity ; RF system: impedance ; microwaves: energy loss ; microwaves: coupling ; Maxwell equation ; DESY TESLA Linac

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Contributing Institute(s):

1. M-Bereich (M(-2012))

Research Program(s):

1. No facility / HGF program None (POF1-890) (POF1-890)

Experiment(s):

1. No specific instrument

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Proceedings/Report Decking, W. (Corresponding author)DESY*
Contributions to the 7th European Particle Accelerator Conference EPAC 2000
2000The 7th European Particle Accelerator Conference EPAC 2000, EPAC 2000, ViennaVienna, Austria, 26 Jun 2000 - 30 Jun 20002000-06-262000-06-30 Hamburg : DESY (2000)2000     Fulltext BibTeX | EndNote: XML, Text | RIS

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