M. Pisharody

TL;DR: In this article, the authors describe the low power and high power performance of planar waveguide windows designed and fabricated by Thomson Tubes and tested at LNS, which are intended for use in the phase III upgrade of CESR.

TL;DR: The prototype superconducting cavity system for CESR-Phase III was tested in CESR in August 1994 as mentioned in this paper, and a maximum of 155 kW of rf power was transferred to a 120 mA beam.

Abstract: A phased luminosity upgrade of the CESR e/sup +/e/sup -/ storage ring has been initiated. The upgrade program calls for the eventual installation of superconducting cavities with strongly damped high-order modes. The cavity is designed to allow all HOMs to propagate into the beam pipe, so that they may be damned by a layer of microwave absorbing ferrite. RF measurements with a full-size copper cavity and loads made of TT2-111R ferrite indicate that the design gives adequate HOM damping. The coupling impedance of the ferrite loads and the consequences for beam stability in a high-current ring have been predicted. Prototypes for the cavity, cryostat and HOM loads were subjected to a beam test in CESR. To further test our understanding of the beam-ferrite interaction, beam measurements were done in CESR in December 1994 on a ferrite load of magnified coupling impedance.

TL;DR: In this paper, the transverse stability of a single beam composed of trains of bunches was investigated using a beam simulator and the results showed that the stability of the beam was not affected by the number of trains in the beam.

TL;DR: In this article, a beam test of the superconducting accelerating cavity module for the CESR upgrade was conducted, and the effect of the module on the total machine loss factor and the influence of the cavity tuner position on the frequencies and damping times of coupled bunch modes was investigated.