background: the characteristics of secondary neutrons in a high energy radiation therapy room were studied using the mcnpx monte carlo (mc) code. materials and methods: two mc models including a model with full description of head components and a simplified model used in previous studies were implemented for mc simulations. results: results showed 4-53% difference between full and with the sim...

The conception of High Power Linac developed in Russian accelerator centres is based on the use of independently phased SC resonators with quadrupole lenses between them. The type and parameters of the resonators as well as focusing structure are varied along the linac to optimise beam dynamics and the characteristics of the linac. The beam evolution in the linac was studied by simulation in 3D...

Y. He, Z. Zhang, Q. Dai, W. Yu, B. Lu, Z. Fan, J. An, L. Jin, G. Li, W. Rehwald, R. Jerecic, and D. Li department of radiology, An zhen hospital, Beijing, China, People's Republic of, Siemens Mindit Magnetic Resonance, Siemens Healthcare, MR Collaboration NE Asia, Siemens Limited China, Siemens Healthcare, MR Collaboration NE Asia, Siemens Mindit Magnetic Resonance Ltd, Siemens Healthcare USA, ...

The ISAC II superconducting linac is presently in the beam commissioning phase. The linac lattice consists of modules of four quarter wave cavities and one superconducting solenoid. At the moment five cryomodules (indicated as medium beta section) are installed. Beam steerers between cryomodules compensate for steering effects due to misalignments in the solenoids. Beam dynamics aspects of lina...

In-the Stanford Linear Collider the beam leaves a damping ring and then enters the Ring-to-Linac (RTL) transfer line. In the RTL it is compressed in length by a factor of 10 by means of an rf section, with which a longitudinally correlated energy variation is induced in the beam, and a following beam line which has non-zero momentum compaction. The compressed beam then enters the linac proper. ...

We develop a novel photoelectron linear accelerator using a plane wave transformer (PWT) design [1]. In this design the input RF power is coupled to the accelerating cavities via a large concentric manifold cavity. The scheme makes possible very strong coupling between the accelerating cells, and relaxes manufacturing tolerances. The compact photoelectron linac integrates a photocathode directl...

The Japan Hadron Facility of KEK and the Neutron Science Project of JAERI have been merged to one project; the KEK/JAERI Joint Project for high-intensity proton accelerator facility. The purpose of the Joint Project is to pursue frontier science and nuclear technology. The accelerator for the Joint Project comprises a normaland super-conducting linac, a 3-GeV rapid cycling synchrotron and a 50-...

We describe a new proposal to generate bunches as short as 35 fsec rms with the existing SLAC linac and damping ring. The bunch is compressed in three stages, starting with the existing ring-to-linac compressor. A second stage of compression is added in the form of a simple magnetic chicane installed at the 9-GeV location in the linac. The short bunch after the chicane generates a strong wakefi...

090101-1 The proposed Rare Isotope Accelerator (RIA) Facility, an innovative exotic-beam facility for the production of high-quality beams of short-lived isotopes, consists of a fully superconducting 1.4 GV driver linac and a 140 MV postaccelerator. To produce sufficient intensities of secondary beams the driver linac will provide 400 kW primary beams of any ion from hydrogen to uranium. Becaus...

Traditionally, high intensity linac designs follow the “equipartitioning condition”, a strict control of the transverse and longitudinal tune ratios throughout the linac that ensures space-charge driven emittance exchange between the longitudinal and transverse planes is minimised. However, equipartitioning imposes strict rules on the linac design, thus limiting the design options and increasin...