An extension of W.. Willis’ Switched Power Linac is studied. Pulsed laser light falls on a photocathode wire, or wires, within a simple resonant structure. The resulting pulsed electron current between the wire and the structure wall drives the resonant field, and rf energy is extracted in the mm to cm wavelength range. Various geometries are presented, including one consisting of a simple arra...

In this paper the single and multibunch emittance growths in the main linac of a linear collider are analytically treated in analogy to the Brownian motion of a molecule, and the analytical formulae for the emittance growth due to accelerating structure misalignment errors are obtained by solving Langevin equation. The same set of formulae is derived also by solving directly Fokker-Planck equat...

PLACET[1] is a program used to simulate the dynamics, including wakefields, of a beam in the main accelerating or decelerating part of a linac. It allows for the investigation of singleand multi-bunch effects, the simulation of normal RF cavities with relatively low group velocities, as well as transfer structures specific to CLIC. Recent improvements, including the possibility to simulate bunc...

It has been suggested for quality assurance purposes that linac output variations for helical tomotherapy (HT) be within +/-2% of the long-term average. Due to cancellation of systematic uncertainty and averaging of random uncertainty over multiple beam directions, relative uncertainties in the dose distribution can be significantly lower than those in linac output. The sensitivity of four HT c...

Superconducting RF technology is playing a more and more important roles in high-power proton linacs. Zerocurrent periodic phase advance less than 90 degrees and equipartitioning design are considered very important principles in the linac design. Due to the very high construction and operation costs, it is very important to optimize the design to lower the costs. With the technical advancement...

Spallation sources dedicated to neutron scattering experiments, as well as multipurpose facilities serving several applications call for pulsed mode operation of a high intensity proton linac. There is general agreement on the superconducting technology for the high-energy part, which offers some advantages, like higher gradient capabilities or operational costs reduction, as compared to room-t...

A graphite calorimeter has been developed as a Japanese primary standard of absorbed dose to water in the high-energy photon beams from a clinical linac. To obtain conversion factors for the graphite calorimeter, the beam characteristics of the highenergy photon beams from the clinical linac at National Metrology Institute of Japan were calculated with the EGS5 Monte Carlo simulation code. To r...

The optic and simulation group at HZB are designing a light source based on the emerging Energy Recovery Linac superconducting technology, the Femto-ScienceFactory (FSF) will provide its users with ultra-bright photons of angstrom wavelength at 6 GeV. The FSF is intended to be a multi-user facility and offer a wide variety of operation modes. A low emittance ∼ 0.1μm rad mode will operate in con...

A 1.6MeV X-Band traveling wave linear accelerator is being developed in our Lab. in view of X-band Linac R&D and industrial purposes. One section of accelerator structure has been fabricated successfully. In this paper, the RF coupler computer simulation, the constant powerloss collinear load study and the accelerator section development are described in detail. The manufacture technology and s...

After the successful operation of FLASH (Free-Electron Laser in Hamburg) and LCLS (Linac Coherent Light Source), soft and hard X-ray Free Electron Lasers (FELs) are being built, designed or proposed at many accelerator laboratories. Acceleration employing lower frequency RF cavities, ranging from L-band to C-band, is usually adopted in these designs. In the first stage bunch compression, higher...