Horizontal test for BEPCII 500 MHz spare cavity

SIMULATIONS AND RF MEASUREMENTS OF THE FUNDAMENTAL AND HIGHER ORDER MODES OF THE THOMX 500 MHz CAVITY*

The RF system of the ThomX storage ring consists in a 500 MHz single cell copper cavity of the ELETTRA type, powered with a 50 kW CW solid state amplifier, and the associated Low Level RF feedback and control loops. The low operating energy of 50–70 MeV makes the impedances of the cavity higher order modes (HOMs) particularly critical for the beam stability. Their parasitic effects on the beam ...

500 MHz spaced Yb:fiber laser frequency comb without amplifiers.

An optical frequency comb based on Yb:ring fiber laser was demonstrated. This is the first time, to our knowledge, f(ceo) has been generated directly from the oscillator without further amplifications above 500 MHz repetition rate. The signal-to-noise ratio of the offset frequency was above 40 dB at 300 kHz resolution bandwidth, which supports easy stabilization. The offset frequency was stabil...

Rhic 28 Mhz Accelerating Cavity System*

The 28 MHz accelerating system consists of a quarter wave cavity driven by an inductively coupled 100kW tetrode amplifer and 1kW solid state driver amplifer. 40dB of rf feedback closed around the cavity and amplifers reduces small perturbations within the loop by a factor of 100, and reduces the time required to shift the phase at transition by a factor of 10, limited by the saturation of the d...

Effect of Clustering upon a 500 - Mb . Horizontal Sounding System

Stream functions and velocity potentials derived from historical tapes of the National Meteorological Center are utilized to provide an estimate of the degree of clustering to be expected from a 500-mb. horizontal-sounding system. From a basically symmetric distribution of particles (balloons) over the Northern Hemisphere north of 15" N., it is found that the clustering tendency increases for 2...

Survey and Alignment for BEPCII Storage Ring