First demonstration of simultaneous measurement of beam current, beam position, and beam tilt on induction linac using combined B-dot monitor

2017 ◽  
Vol 88 (6) ◽  
pp. 063302
Author(s):  
Xiaozhong He ◽  
Jian Pang ◽  
Nan Chen ◽  
Qin Li ◽  
Wenhua Dai ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Beam Current ◽  
Beam Position ◽  
Induction Linac

Precise beam current measurement for storage ring using beam position monitor

2010 ◽  
Vol 22 (12) ◽  
pp. 2973-2978 ◽  
Author(s):  
冷用斌 Leng Yongbin ◽  
阎映炳 Yan Yingbing ◽  
周伟民 Zhou Weimin ◽  
袁任贤 Yuan Renxian
Keyword(s):  
Storage Ring ◽  
Beam Current ◽  
Current Measurement ◽  
Beam Position Monitor ◽  
Beam Position ◽  
Beam Current Measurement

MICROBEAM ANALYSIS SYSTEM AT TOHOKU UNIVERSITY

2004 ◽  
Vol 14 (01n02) ◽  
pp. 1-7 ◽  
Author(s):  
S. MATSUYAMA ◽  
K. ISHII ◽  
H. YAMAZAKI ◽  
Y. BARBOTTEAU ◽  
TS. AMARTAIVAN ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Simultaneous Measurement ◽  
Beam Current ◽  
Biological Applications ◽  
Biological Application ◽  
Microbeam Analysis ◽  
Analysis System

A microbeam analysis system has been developed at Tohoku University for biological applications. Spatial resolution of less than 1 μm has been achieved with a beam current of ~40 pA. In microbeam analysis of biological specimens, simultaneous measurement of structural and elemental properties is very important. Our system is applicable to simultaneous in-air/vacuum PIXE, RBS and STIM analyses. Typical results of biological application are shown.

scholarly journals Initial Studies of Electron Beams as a Means of Modifying Collagen

Physics ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 220-239
Author(s):  
Robert Apsimon ◽  
Sadiq Setiniyaz ◽  
Rebecca Seviour ◽  
William Wise ◽  
Tobias Junginger ◽  
...  
Keyword(s):  
Dose Distribution ◽  
Particle Interaction ◽  
Integrated Design ◽  
Beam Current ◽  
Initial Energy ◽  
Angle Of Incidence ◽  
Beam Particle ◽  
Beam Position ◽  
Depth Dose ◽  
Mechanical Behaviours

We present the initial design studies and specifications for an accelerator and conveyor system to irradiate collagen samples, modifying properties such as the putrescibility and mechanical behaviours in a paradigm shift from existing, widely used technology. We show the integrated design requirements for a magnetic rastering scheme to move the beam position in order to ensure a uniform dose distribution over the full surface of the hide and discuss its dependence on factors such as the size of the hide, the beam current and conveyor speed. We also present initial energy deposition studies using beam particle interaction simulation program G4beamline, in order to determine the numerical beam parameters and angle of incidence needed to ensure a uniform depth-dose distribution throughout the hide thickness.

scholarly journals Non-Interceptive Beam Current and Position Monitors for a Cyclotron Based Proton Therapy Facility

2021 ◽  
Author(s):  
◽  
Sudharsan Srinivasan
Keyword(s):  
Proton Therapy ◽  
Second Harmonic ◽  
Beam Quality ◽  
Cavity Resonator ◽  
Beam Current ◽  
Cavity Resonators ◽  
Position Information ◽  
Beam Position ◽  
And Performance ◽  
Proton Therapy Facility

In PSI’s dedicated proton therapy facility PROSCAN a pulsed 250 MeV proton beam is delivered by a superconducting cyclotron. During the proton-irradiation treatments, there is a need to accurately measure beam current, in the range of 0.1-10 nA, and beam position (required accuracy 0.5 mm). The beam current is directly associated with the dose-rate in the treatment and the beam position with the quality of the dose distribution in the patient. However, the presently used measurements compromise the beam quality. Nevertheless, it is a necessity to perform these measurements online and with minimal beam disturbance. This thesis reports on the development of two types of cavity resonators to perform non-interceptive measurements of these beam parameters, within the required accuracy. For beam current measurements, a single cavity resonator has been built. For the beam position measurements, a cavity resonator consisting of four separate segments has been built. Both cavity resonators have been tuned to the second harmonic of the beam pulse rate, i.e., 145.7 MHz. In test bench experiments and with proton beams, a good agreement between the expected and measured sensitivity of these resonators has been found. The cavity used to measure beam current can measure currents down to 0.15 nA with a resolution of 0.05 nA. The cavity for measuring beam position delivers position information with the required accuracy and resolution demands of 0.5 mm. The design, tests and performance in the beam as well as special applications, future improvements and limitations are discussed.

Status of Taiwan Photon Source front end in National Synchrotron Radiation Research Center

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
I. C. Sheng ◽  
C. K. Kuan ◽  
Y. T. Cheng ◽  
Y. H. Yan ◽  
G. Y. Hsiung ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Beam Current ◽  
Research Center ◽  
Third Generation ◽  
Beam Position Monitor ◽  
Beam Position ◽  
Front End ◽  
Insertion Device ◽  
Radiation Research ◽  
Photon Source

National Synchrotron Radiation Research Center (NSRRC) in Taiwan has initialized the construction of Taiwan Photon Source (TPS) synchrotron accelerator project. This 3 GeV, 500 mA beam current third-generation synchrotron accelerator will have a total of seven insertion device beam lines at day 1 after commissioning. That is, there will be one 2 × EPU48, five IU22 and one U5 undulator beamline. Corresponding front end components such as fixed masks, photon beam position monitor, photon absorber, slits and heavy metal shutter have been designed; manufacturing of these subsystems are on the way. Several prototype assemblies are completed, tested and will be reported in this paper.

Effects of Ion Beam Milling on Surface Topography

1973 ◽  
Vol 31 ◽  
pp. 84-85
Author(s):  
P.G. Pawar ◽  
P. Duhamel ◽  
G.W. Monk
Keyword(s):  
Surface Topography ◽  
Ion Beam ◽  
Solid Material ◽  
Beam Current ◽  
Atomic Mass ◽  
Micro Milling ◽  
Ion Milling ◽  
Controlled Atmospheres ◽  
Milling Operations ◽  
Sufficient Energy

A beam of ions of mass greater than a few atomic mass units and with sufficient energy can remove atoms from the surface of a solid material at a useful rate. A system used to achieve this purpose under controlled atmospheres is called an ion miliing machine. An ion milling apparatus presently available as IMMI-III with a IMMIAC was used in this investigation. Unless otherwise stated, all the micro milling operations were done with Ar+ at 6kv using a beam current of 100 μA for each of the two guns, with a specimen tilt of 15° from the horizontal plane.It is fairly well established that ion bombardment of the surface of homogeneous materials can produce surface topography which resembles geological erosional features.

Injector for a 100-500 kV Linac Electron Microscopy Source

1967 ◽  
Vol 25 ◽  
pp. 274-275
Author(s):  
John W. Coleman
Keyword(s):  
Electron Microscopy ◽  
Linear Accelerator ◽  
Beam Current ◽  
Ion Trapping ◽  
University Of Virginia ◽  
Electron Injector ◽  
Illumination System ◽  
Radio Corporation Of America ◽  
The University ◽  
Optical Integration

The injector to be described is a component in the Electron Injector-Linear Accelerator—Condenser Module for illumination used on the variable 100-500kV electron microscope being built at the Radio Corporation of America for the University of Virginia.The injector is an independently powered, autonomous unit, operating at a constant 6kV positive with respect to accelerator potential, thereby making beam current independent of accelerator potential. The injector provides for on-axis ion trapping to prolong filament lifetime, and incorporates a derived Einzel lens for optical integration into the overall illumination system for microscopy. Electrostatic beam deflectors for alignment are an integral part of the apparatus. The entire injector unit is cantilevered off a door for side loading, and is topped with a 4-filament turret released electrically but driven by a self-contained Negator spring motor.

Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

1988 ◽  
Vol 46 ◽  
pp. 204-205
Author(s):  
Kazumichi Ogura ◽  
Michael M. Kersker
Keyword(s):  
High Resolution ◽  
Layer Structure ◽  
High Sensitivity ◽  
Beam Current ◽  
Electron Beam Current ◽  
Lattice Structures ◽  
Super Lattice ◽  
Different Types ◽  
Backscattered Electron ◽  
Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

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