High average power FELs require high average current electron injectors capable of generating high quality, short duration electron bunches with a repetition rate equal to the frequency of the rf linac. In this paper we propose, analyze and simulate an rf-gated, gridded thermionic electron gun for use in high average power FELs. Thermionic cathodes can provide the necessary high current, have l...

The superconducting 1.3-GHz niobium cavities of the XFEL linear accelerator will be cooled in a bath of saturated liquid He II at a temperature of 2 K. The liquid He II supply of the 1.7-km long linac is subdivided in sections of about 150 m length. In these sections a two-phase flow of He II liquid and corresponding vapor occurs. A stable stratified smooth helium flow has to be maintained for ...

Tumor therapy with light ion beams like Carbon out of a synchrotron is a topical accelerator application. In all designs the layout of the injector linac is an important factor with respect to construction and operation costs as well as to the operation performance of such a medical facility. Two alternative linac approaches which keep the number of components and setting parameters as low as p...

A radioactive ion beam facility, ISAC, is presently under construction at TRIUMF. The post-accelerator takes ions of A=q 30 from 2 keV/u to energies up to 1.5 MeV/u. For the next five year plan, it is intended to increase the final energy above the Coulomb barrier (roughly 6.5 MeV/u) and broaden the mass range up to roughly A=150. The ISAC2 proposal utilizes the existing RFQ, and a new IH drift...

The Accelerator for the Production of Tritium (APT) requires a very high proton beam current (100 mA cw). The requirement for hands-on maintenance limits the beam spill to less than 0.2 nA/m along most of the linac. To achieve this goal, it is important to understand the effects of fabrication, installation and operational errors, establish realistic tolerances, and develop techniques for mitig...

We describe linac protection and a conventional collimation system appqxiate for a next linear collider. The linac accelerating structure can be protected from “worst credible failures” by a system of sacrificial spoilers. For the collimation system we consider the effects of asverse wakefields and the transmission, heating, mechanical stress, and edge-scattering properties of scrapers. We requ...

Here, we report on the working group ‘‘Optics and Beam Transport’’ of the 2005 Energy-Recovery-Linac Workshop. This workshop also had working groups on ‘‘Electron Guns and Injector Designs’’, ‘‘Superconducting RF and RF Control’’, and ‘‘Synchronization and Diagnostics/Instrumentation’’. Here, we are concerned with the many different ERL proposals that international laboratories have been workin...

A basic and clinical study of radiosurgery using the linear accelerator (Linac) system for unremovable deep-seated brain tumors is reported. A Komai stereotactic ring was used to locate the target coordinates. The patient was laid on the Linac treatment table and held in the head fixation system. Irradiation was given in five positions. The dose profile by film dosimetry and Rando phantom was s...

Beam dynamics simulations of the proposed Rare Isotope Accelerator (RIA) [1] driver linac have been done. The RIA driver linac is designed to accelerate stable ion beams from proton to uranium to final energies of 400 MeV/u for the heaviest and about 900 MeV/u for the lightest ions with beam powers of 100 to 400 kW. Two stripping sections are used to increase the charge state of heavy ions and ...

Louisiana State University Center for Advanced Microstructures and Devices (CAMD) began a control system upgrade project in early 1997. At the time, the storage ring was controlled by a VAX/VMS system, primarily using CAMAC for I/O. The injector Linac was controlled by a separate VME/OS/9 system using custom I/O components. The storage ring control system has been replaced with a PC/Linux based...