Abstract The neutral beam injectors of the ITER experiment will be based on negative ion sources for generation beams composed by 1 MeV H/D particles. prototype these is currently under testing in SPIDER experiment, part Neutral Beam Test Facility Consorzio RFX, Padua, Italy. Among targets experimentation SPIDER, it foremost importance to maximize current density produced accelerator. operating...

In this paper we present the design for a low-cost RF cavity capable of accelerating protons from 100 keV to 1MeV. The system is designed to meet the specifications from the proposed Alceli LTDmedical proton therapy linac, to deliver a 1 nA proton beam current with a 1 kHz repetition rate. We present a design of an RF normal conducting (NC) re-entrant Cu cavity operating at 40MHz consisting of ...

We present the first measurements of the angular dependence of the betatron x-ray spectrum produced by electrons inside the cavity of a laser-wakefield accelerator. Electrons accelerated up to 300 MeV energies produce a beam of broadband, forward-directed betatron x-ray radiation extending up to 80 keV. The angular resolved spectrum from an image plate-based spectrometer with differential filte...

Recent years have witnessed rapid advances of MeV ultrafast electron diffraction (UED), in which high quality, ultrashort, MeV electron pulses from a photocathode RF gun are employed as probes for ultrafast structural dynamics. We’ve built a prototype MeV UED system at the Accelerator Laboratory of Tsinghua University, optimized the the electron pulse parameters as well as hardware performances...

Axions solve the Strong CP Problem and are a cold dark matter candidate. The combined constraints from accelerator searches, stellar evolution limits and cosmology suggest that the axion mass is in the range 3 · 10 > ma > 10 −6 eV. The lower bound can, however, be relaxed in a number of ways. I discuss the constraint on axion models from the absence of isocurvature perturbations. Dark matter ax...

The success of peritoneal dialysis depends on the presence of functional long-term catheter access to the peritoneal cavity. Mechanical problems of peritoneal dialysis catheter are the second most common cause of depriving patients from peritoneal dialysis, next to infectious problems.1 Intraluminal fibrin clot is one type of mechanical problems that mostly treated conservatively by nonsurgical...

The control system of accelerator complex at SRRC work well since its dedication in 1993. Several major upgrade projects will finish in the early of next millennium to improve performance of the light source. Injector of SRRC will run in 1.5 GeV in 2000 with rejuvenated control system that has been integrated to main control system recently. Orbit feedback system is developed to improve orbit s...

This paper discusses the design, fabrication and testing of a high power alumina disk window in WR1500 waveguide at L Band, suitable for use in the NLC damping ring RF cavities at 714 MHz and the LEDA Accelerator at 700 MHz. The design is based on the fabrication methods used for the successful PEP-II cavity windows. Four prototype windows at 700 MHz have been produced by LBNL for testing at LA...

A digital control of superconducting cavities for a linear accelerator is presented. FPGA based controller supported by MATLAB system was developed to investigate the novel firmware implementation. Algebraic model in complex domain is proposed for the system analyzing. Identification of the system parameters is carried out by the least squares method application. Control tables: Feed-Forward an...

The geometry of an accelerator cavity determines its eigenmodes and thereby its performance characteristics. Therefore, accelerating performance and wakefield characteristics may be improved by an intentional modification of the geometry. However, undesired geometry perturbations due to manufacturing tolerances and operational demands can likewise impair it. To analyze the effects of geometry v...