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Title Development of the 3.9GHz, 3rd harmonic cavity at FNAL
Type Poster cavity design / fabrication / treatment
Abstract Peak current and emittance of the high brightness photoinjector are limited by non-linear energy distribution in the bunch. Adding a weighted amount of third harmonic accelerating voltage allows compensate this non-linearity. For FNAL-NICADD photoinjector it can result in significant improvement of its performance reducing emittance and increasing peak current. These benefits have triggered designing and prototyping of a superconducting 3.9 GHz (3rd harmonic to 1.3GHz used as a main accelerating frequency) cavity at FNAL.  At first stage it was built two models: 9-cell copper cavity and 3-cell niobium cavity. In this paper the status of the cavity design and results of RF measurements of the two models are presented.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Solyak N FNAL
Borissov E FNAL
Edwards H FNAL
Foley M FNAL
Khabiboulline T FNAL
Mitchell D FNAL



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