نتایج جستجو برای: i beam
تعداد نتایج: 1145085 فیلتر نتایج به سال:
The Beam Switchyard for the Stanford Linear Accelerator is a large Y-shaped area (see Fig. 1) containing, magnets, sl i ts , collimators, and instrumentation for beam observation. It has three main functions: (1) to momentum analyze the beam and determine energy spread a t the exit; (2) to transport the beam to the experiment under selected focusing conditions; and (3) to separate the interlace...
The investigation of current transformers for measurements of beam current for relativistic electrons in air is presented in this report. The industrial CW electron accelerator Rhodotron ( E = 5 MeV, I = 1-16 mA) was used for experiments. The effect of scanning electron beam allows pulsed current transformers to be used for measurements of beam current. The comparison of beam current measurem...
For proton spot scanning, use of a real-time-image gating technique incorporating an implanted marker and dual fluoroscopy facilitates mitigation of the dose distribution deterioration caused by interplay effects. This study explored the advantages of using a real-time-image gating technique, with a focus on prostate cancer. Two patient-positioning methods using fiducial markers were compared: ...
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 primary treatment of thyroid carcinoma is surgery and the outcome depends on its extent. the post-operative management alternatives in thyroid carcinoma include thyroid hormone, radio-iodine ablation (i-131 na), external beam radiation therapy (ebrt) and occasionally adjuvant chemotherapy. this retrospective study analyzes the managements of 153 patients (102, 51), age range 10-96 years, me...
Radio astronomical measurements of extended emission require knowledge of the beam shape and response because the measurements need correction for quantities such as beam efficiency and beamwidth. We describe a scheme that characterizes the main beam and sidelobe in all Stokes parameters employing parameters that allow reconstruction of the complete beam patterns and, also, afford an easy way t...
A displacement finite element method for analyzing a beam on continuous elastic foundation is presented. A three-dimensional model which accounts for the effects of both the Filonenko-Borodich and Pastemak foundation models in a consistent and complete way is used. A variational principle is introduced with the slope field due to bending only and the displacement field approximated by independe...
The Cerenkov free electron laser (CFEL) model under consideration consists of a pre-bunched relativistic electron beam and a dielectric loaded waveguide. The increase in the growth rate and gain with the change in phase by using a pre-bunched electron beam in a Cerenkov free electron laser (CFEL) has been studied. The growth rate and gain is calculated at experimentally known CFEL and FEL param...
Longitudinal focusing and acceleration are performed by RF electric fields in cavity resonators. The topic of “Beam Loading” denotes all the phenomena encompassed by “the cavity is driven by two current sources: (i) the generator and (ii) the beam”. One attempts to control the beam using the generator components; but our ability to control the generator’s effect is compromised by strong perturb...
This paper evaluates the effect of slot existence with limited length between flanges and web junction of I-shaped beams at the region of moment connections on vertical force and shear stress distribution in beam flanges and web at connection section in comparison with classical theory of stress distribution. The main purpose of this research is to evaluate the efficiency of the slot in connect...
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