A RFQ linac (3MeV, 350MHz, 20mA, CW and 324cm in length) is being built for the Korea Multipurpose Accelerator Complex (KOMAC). The physical and engineering design of the H/H RFQ linac are described. The fabrication process for the cold model and structure support is described. The current status of the RFQ is reported.

PURPOSE The integration of a low field biplanar magnetic resonance (MR) imager and linear accelerator (linac) causes magnetic interference at the linac due to the MR fringe fields. In order to eliminate this interference, passive and active magnetic shielding designs are investigated. METHODS The optimized design of passive magnetic shielding was performed using the finite element method. The...

Abstract The purpose of this paper is to present the Monte-Carlo calculations performed design a special element called gamma blocker (GB), necessary stop radiation in Accelerator-to-Target (A2T) section European Spallation Source (ESS) linac. Very high levels emitted backward from activated target through beam pipe could effectively block any human intervention close transport system. residual...

To devise an activation technique for characterizing mixed radiation fields, secondary particles from a copper target irradiated by 24 GeV/c protons were measured at the CERN High-energy AcceleRator Mixed field facility (CHARM). Activation detector sets consisting of aluminum, niobium, indium, and bismuth, placed 30 cm angles 15° to 160° with respect beam axis. The nuclides generated in these d...

Methods and results for commissioning of the complete VMAT delivery chain are presented for the combination of Nucletron's Oncentra MasterPlan® v3.3 with Elekta's Mosaiq® v1.6 and SynergyS® linac. VMAT specific linac commissioning included determination of the size of the minimal dynamic leaf gap. Dosimetric validation of the complete treatment chain was performed using a 2D-ionization-chamber-...

Most scenarios for accelerating muons require recirculating acceleration. A racetrack shape for the accelerator requires particles with lower energy in early passes to traverse almost the same length of arc as particles with the highest energy. This extra arc length may lead to excess decays and excess cost. Changing the geometry to a “dogbone” shape, where there is a single linac and the beam ...

The JLC is a linear collider project pursued in Japan by researchers centered around KEK. The R&D status for the JLC project is presented, with emphasis on recent results from ATF concerning studies of production of ultra-low emittance beams and from manufacturing research on X-band accelerator structures.

Accurate alignment of linear accelerator table rotational axis with radiation isocenter is critical for noncoplanar radiotherapy applications. The purpose of the present study is to develop a method to align the table rotation axis and the MV isocenter to submillimeter accuracy. We developed a computerized method using electronic portal imaging device (EPID) and measured alignment stability ove...