The cavity control system for the TESLA TeV–Energy Superconducting Linear Accelerator project is initially introduced in this paper. The FPGA – Field Programmable Gate Array technology has been implemented for digital controller stabilizing cavity field gradient. The cavity SIMULINK model has been applied to test the hardware controller. The step operation method has been developed for testing ...

We have developed a concept for a high average power FEL which incorporates a superconducting rf linac in an energy recovery configuration to increase the overall efficiency . Our design minimizes space charge effects at low beam energy by using : (1) higher than usual voltages on our grid modulated electrostatic electron gun and (2) pulse widths much longer than usual, from the gun. These puls...

Introduction ................................................ 948 Colliding Linac Design ...................................... 948 2.1 Luminosity ........................................ 949 2.2 Disruption ........................................ 951 2.3 Beamstrahlung ..................................... 952 2.4 Cavity loading ..................................... 953 2.5 A 50-TeV Parameter L...

Abstract Using a 11.4 GHz, 50-MW, <1 μs, pulsed power source and a TE013-like mode copper cavity, we have been measuring critical magnetic fields of superconductors for accelerator cavity applications. This device can eliminate both thermal and field emission effects due to a short pulse and no electric field at the sample surface. A model of the system is presented in this paper along with a d...

Last year an intense electron beam produced by an induction accelerator was bunched using a Free Electron Laser and used to generate radio-frequency power by its passage through a resonant cavity. An improved version of this experiment has been carried out in the last few months. Our aims were mainly to extract a higher beam current from the FEL and to obtain a longer R-F pulse duration from th...

Iris type waveguide to cavity couplers are used to couple power to particle accelerator cavities. Waveguide to cavity coupling for arbitrarily oriented rectangular iris is analyzed using Bethe’s small hole coupling theory. Magnetic moment of rotated iris is obtained by defining its dyadic magnetic polarizability. Power radiated by magnetic moment into the incoming waveguide is used for coupling...

The 6 GeV CEBAF accelerator at Jefferson Lab is arranged in a five-pass racetrack configuration, with two superconducting radio frequency (SRF) linacs joined by independent magnet transport arcs. It is planned to increase the accelerator energy to eventually support 12 GeV operations. To achieve this, a new 7-cell superconducting cavity is being built to operate at an average accelerating gradi...

The FLASH L-band (1.3 GHz) superconducting accelerator facility at DESY has a Low Level RF (LLRF) system that is similar to that envisioned for ILC. This system has extensive monitoring capability and was used to gather performance data relevant to ILC. In particular, waveform data were recorded with beam off for three, 8-cavity cryomodules to evaluate the input rf stability, perturbations to t...

We report on the L-band RF power distribution system (PDS) developed at SLAC for Fermilab’s NML superconducting test accelerator facility. The makeup of the system, which allows tailoring of the power distribution to cavities by pairs, is briefly described. Cold test measurements of the system and the results of high power processing are presented. We also investigate the feasibility of elimina...