Medical accelerators require arc-free operation. Due to high-field emission, arcing and outgassing can occur in high-power accelerators. Therefore, the accelerator’s inner surfaces have to be conditioned before its use at high gradient levels in Radiation Therapy machines. At Siemens, we have developed a technique to automatically condition accelerator structures by continually inspecting the a...

objective: using megavoltage photons generated by medical linear accelerator is a common modality for the treatment of malignant. the crucial problem for using photon beams >8mv is the photoneutron yields that increase the risk of secondary cancer that treated with high-energy photon beams. the contaminated neutrons produced in different components of the accelerator head and rely on many param...

The OpenMP API provides a portable model for efficient, high level thread-parallel programming across platforms, vendors, operating systems. We are developing a model with the same advantages to address compute accelerators. In this talk, we explore today’s accelerator landscape, along with the perils of current programming methods. We demonstrate why OpenCL, while impressive and important, doe...

This paper describes an X-Band RF system for the Next Linear Collider Test Accelerator.[1] The RF system consists of a 90 MeV injector and a 540 MeV linac. The main components of the injector are two low-Q singlecavity prebunchers and two 0.9-m-long detuned accelerator sections. The linac system consists of six 1.8-mlong detuned and damped detuned accelerator sections powered in pairs. The rf p...

Several laser plasma accelerator schemes are reviewed, with emphasis on the Pl,asma Beat Wave Accelerator (PBWA). Theory indicates that a very high acceleration gradient, of order 1 GeV/m, can exist in the plasma wave driven by the beating lasers. Experimental results obtained on the PBWA experiment at UCLA confirms this. Parameters related to the PBWA as an accelerator system are derived, amon...

Omega3P is a parallel eigenmode calculation code for accelerator cavities in frequency domain analysis using finite-element methods. In this report, we will present detailed finite-element formulations and resulting eigenvalue problems for lossless cavities, cavities with lossy materials, cavities with imperfectly conducting surfaces, and cavities with waveguide coupling. We will discuss the pa...

A system for characterizing the phase shift per cell of a long X-band accelerator structure is described. The fields within the structure are perturbed by a small cylindrical metal bead pulled along the axis. A computer controls the bead position and processes the data from a network analyzer connected to the accelerator section. Measurements made on prototype accelerator sections are described...

Vibration measurements of the linear accelerator structures in the SLC linac show a 1 micron rms vertical motion. This motion reduces to 0.2 micron rms motion when the cooling water to the accelerator structures is turned off. The quadrupoles have 250 nanometer rms vertical motion with the accelerator structure cooling water on and 60 nanometer motion with it off. These results together with me...

In this paper we present an automatic system developed for the Lisbon’s Technologic Nuclear Institute to control the operation of their particle accelerator. It is an accelerator based on a Van de Graaff machine. The system uses a personal computer running LabVIEW software which implements the procedures to automatically increase the terminal voltage, light-up the ion source and focus the parti...

We experimentally and numerically investigate the quantum accelerator mode dynamics of an atom optical realization of the quantum delta-kicked accelerator, whose classical dynamics are chaotic. Using a Ramsey-type experiment, we observe interference, demonstrating that quantum accelerator modes are formed coherently. We construct a link between the behavior of the evolution's fidelity and the p...