نتایج جستجو برای: commissioning beam
تعداد نتایج: 116791 فیلتر نتایج به سال:
The LCLS beam provides revolutionary capabilities for studying the transient behavior of matter in extreme conditions. The particular strength of the Matter in Extreme Conditions instrument is that it combines the unique LCLS beam with high-power optical laser beams, and a suite of dedicated diagnostics tailored for this field of science. In this paper an overview of the beamline, the capabilit...
We report on the commissioning of a higher harmonic radiofrequency system at the Advanced Light Source, designed to improve the beam lifetime. We have achieved an increase above a factor of two in our best results up to now. Transient beam loading of the harmonic cavities, due to the unequal fill patterns, creates the greatest limitations on lifetime improvement. We also describe several intere...
Scanned ion beam delivery enables the highest degree of target dose conformation attainable in external beam radiotherapy. Nominal pencil beam widths (spot sizes) are recorded during treatment planning system commissioning. Due to changes in the beam-line optics, the actual spot sizes may differ from these commissioning values, leading to differences between planned and delivered dose. The purp...
The T2K neutrino oscillation experiment is scheduled to begin commissioning in 2009. The experiment uses a simulation of the neutrino beam to produce predictions of the relationship between observed events in the near (control) detector and the far detector, Super-Kamiokande. This correction is affected by the alignment of the proton beam on the target. We report on the results of a simulation-...
We have recently designed and installed the first quadrant beam position monitor in the W01B-MX2 beamline. The whole monitor, including its electronics, was installed in-vacuum to reduce errors from current leakage and noise coupling from the outside of the vacuum chamber. Aspects of the mechanical and electronic design of this fluorescence-based beam position monitor, as well as the commission...
This study compared the clinical functionality of BrainSCAN (BrainLAB) and Helios (Eclipse, Varian) for intensity-modulated radiation therapy (IMRT) treatment planning with the aim of identifying practical and technical issues. The study considered implementation and commissioning, dose optimization, and plan assessment. Both systems were commissioned for the same 6 MV photon beam equipped with...
Since October 1997, the SPring-8 facility has been operated well and provided high quality photon beams for users. Over this period, various kinds of improvements have been carried out to achieve brilliant and stable photon beams and to make the most of 8-GeV potentiality. At the same time R&D has continued for future radiation sources. In these activities, the largest achievement has been the ...
This note describes how beam collimation affects detector backgrounds at the collision point for the PEP-II Bfactory, a joint effort of three laboratories: LBNL, LLNL, and SLAC. Beam collimation controls the transverse size as well as the maximum allowed energy spread of the beam. The location of synchrotron radiation masks is determined by the transverse size of the beam in that the masks must...
The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through the first bunch compressor, was commissioned in the spring and summer of 2007. The second phase of commissioning, including the second bunch compressor and various main linac modifications, was completed in...
In this work, we report a comprehensive quality assurance (QA) process for the commissioning of an Electronic Brachytherapy (EB) system at one of the first U.S. sites to apply the device clinically. Thus far, EB systems have been released only for intracavitary breast treatments. As such, EB as an Accelerated Partial Breast Irradiation (APBI) treatment modality is relatively unstudied and is un...
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