PURPOSE To verify the accuracy of volumetric arc therapy (VMAT) using the RapidArc™ device when switching patients from one single linear accelerator (linac) to a paired energy and mechanics "twin" linac without reoptimization of the original treatment plan. PATIENTS AND METHODS Four centers using 8 linacs were involved in this study. Seventy-four patients previously treated with the 6MV phot...

Background: Normoxic type MAGICA gel dosimeters are established for dose quantification in three dimensions for radiotherapy. Objective(s): The ability of MAGICA polymer gel was assessed by experimental measurements method for studying the effect of gold nanoparticles (GNPs) in dose enhancement under the external 18MV radiotherapy practices. <...

The Linac Coherent Light Source (LCLS) is a freeelectron laser facility in construction at Stanford Linear Accelerator Center. It is designed to operate in the wavelength range 0.15-1.5 nanometers. At the time of this conference, civil construction of new tunnels and buildings is complete, the necessary modifications to the SLAC linac are complete, and the undulator system and x-ray optics/diag...

The TRIUMF-VECC Electron Linac is a device for gamma-ray induced fission of actinide targets, with applications in nuclear physics and material science. A phased construction and commissioning scheme will eventually lead to a 50 MeV, 10 mA CW linac based on superconducting RF technology. Using this linac to deliver high intensity electron beams for applications such as an energy-recovered light...

The standard prescription for NLC main linac steering assumes that the RMS offset between a quad’s magnetic center and the corresponding BPM’s electrical center can be determined at the level of a micron. This is a fearsome requirement, and will be particularly difficult to achieve if hybrid iron/permanent magnet quads are used in the main linac. As an alternative, the Dispersion Free Steering ...

The Proof-of-Principle (POP) prototype of the Rf-Focused Drift tube (RFD) linac structure is currently under test at Linac Systems, after years of delay due to a variety of technical problems. A discussion of these technical problems and their solutions will be presented. The status of these tests will be reported. Plans for future development of this linac structure will be revealed. Potential...

After entering into the full-commissioning phase of the KEKB linac in May, 1998, we have established two linac injection modes for the KEKB ring: an 8-GeV electron beam and a 3.5-GeV positron beam, as well as beam modes for the rings of the synchrotron light sources. All modes are easily switched for almost one minute without any trouble. The linac beam characteristics have been substantially i...

Presently a new accelerator complex is being planned at CERN, which will replaced the ageing Proton Synchrotron (PS). A high-power160 MeV H linac (Linac 4) will replace the present 50 MeV proton linac injector [1], a 5 GeV Superconducting Proton Linac (SPL) will replace the 1.4 GeV PS Booster (PSB) [2] and a 50 GeV synchrotron (PS 2) will replace the 26 GeV PS [3]. A tentative layout of the pla...

judicious use of the SLC linac, damping rings, and positron High-energy ring (HER) Low-energy ring (LER) source.. Particles per bunch ._, -. _ II. ROLE OF R&D PROGRAM IN OVERALL PEP-II INJECTION High-energy ring (HER) Low-energy ring (LER) The overall goals of the PEP-II Injection System are Linac repetition rate summarized in Table 1. These differ from those given in Linac current range during...

The SNS is a spallation neutron research facility being built at Oak Ridge National Laboratory in Tennessee [1]. The Linac portion of the SNS (with the exception of the superconducting cavities) is the responsibility of the Los Alamos National Laboratory (LANL), and this responsibility includes the RF system for the entire linac. The linac accelerates an average beam current of 2 mA to an energ...