نتایج جستجو برای: particle accelerator
تعداد نتایج: 189238 فیلتر نتایج به سال:
PAMELA (Particle Accelerator for MEdicaL Applications) is a design study of a novel accelerator for cancer therapy using protons and carbon ions. The accelerator utilizes the nonscaling Fixed Field Alternating Gradient (FFAG) principle and features superconducting combined-function magnets with dipole, quadrupole, sextupole and octupole field components for steering the ion beam. The proton rin...
Non-adiabatic features around the transition energy are well-known to be one of most important beam physics issues in most of circular hadron accelerators. A novel technique to avoid them by the adiabatic motion, a quasiadiabatic, nonfocusing transition-energy crossing (QNTC), was proposed. In a longitudinally separated function-type accelerator, in which particles are confined by an rf voltage...
Many computer programs and a variety of models exist for the design of accelerator lattices and the correction of errors. Many physicists contributed to this work by developing codes to suit a variety of machines. At present, we are integrating some of these codes into a unified framework to design and control any type of machine. We will refer to this system of interactive accelerator design, ...
This tutorial paper provides an overview of design considerations for semiconductor radiation detectors and electronics in high radiation environments. Problems specific to particle accelerator applications are emphasized and many of the presented results originated in extensive studies of radiation effects in large scale particle detectors for the SSC and LHC. Basic radiation damage mechanisms...
Evidence of particle trapping has been observed in a beam driven Plasma Wake Field Accelerator (PWFA) experiment, E164X, conducted at the Stanford Linear Accelerator Center by a collaboration which includes USC, UCLA and SLAC. Such trapping produces plasma dark current when the wakefield amplitude is above a threshold value and may place a limit on the maximum acceleration gradient in a PWFA. T...
The stability of non-linear Integrable Optics Test Accelerator (IOTA) model developed in [1] was tested. The area of the stable region in transverse coordinates and the maximum attainable tune spread were found as a function of non-linear lens strength. Particle loss as a function of turn number was analyzed to determine whether a dynamic aperture limitation present in the system. The system wa...
Superconducting radio frequency (SRF) cavities for particle accelerators are fabricated using high purity niobium to allow for continuous high power operation. A hot-spot generated at a surface defect during accelerator operation can quench superconductivity and limit its performance. Increased heat conduction to the liquid helium bath dissipates hot spots, maintaining performance. Properly tre...
The standard model involves particle symmetry and the mechanism of its breaking. Modern cosmology is based on inflationary models with baryosynthesis and dark matter/energy, which involves physics beyond the standard model. Studies of the physical basis of modern cosmology combine direct searches for new physics at accelerators with its indirect non-accelerator probes, in which cosmological con...
1 Abstract According to the Standard Model of Particle Physics, all particles are necessarily mass-less. Obviously this is not the case. One attempt at reconciling the Standard Model's prediction with observed particle masses is the proposal that particles acquire mass through the interaction with a field that pervades all of space; the stronger the interaction, the greater the acquired mass. T...
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