Physics design of the superconducting section of the CiADS linac

2019 ◽  
Vol 34 (29) ◽  
pp. 1950178
Author(s):  
Shuhui Liu ◽  
Zhijun Wang ◽  
Yue Tao ◽  
Yuan He ◽  
Huan Jia ◽  
...  
Keyword(s):  
Proton Beam ◽  
Continuous Wave ◽  
Proton Accelerator ◽  
Study Results ◽  
Subcritical System ◽  
Error Study

The proton accelerator of the China Initiative Accelerator Driven Subcritical System (CiADS) adopts the continuous wave (CW) and superconducting technical route, and it may accelerate 5 mA proton beam to 500 MeV in energy. In this paper, the baseline physics design of the superconducting section (SC) and some design choices are discussed, and the error study results are also presented.

Numerical Simulation on Molten Metal Collision Behavior Using SPH Method Combined with Fractal Analysis on Morphology of Stacking Pattern

2016 ◽  
Vol 715 ◽  
pp. 203-209
Author(s):  
Masatoshi Futakawa ◽  
Kihei Tsutsui ◽  
Hiroyuki Kogawa ◽  
Takashi Naoe
Keyword(s):  
Proton Beam ◽  
Impact Velocity ◽  
Fractal Analysis ◽  
High Heat ◽  
Proton Accelerator ◽  
Beam Power ◽  
High Heat Flux ◽  
Stacking Pattern ◽  
And Behavior ◽  
The Impact

The developments of the high power proton accelerators become a worldwide interest to provide various applications, where the targets are demanded to efficiently produce secondary beams and to survive intensive MW class proton beam power supplied by the accelerators. Solid metal targets might be melted by very high heat flux that is caused by the intensive proton beam bombardment. In fact, the incident occurred at J-PARC (Japan Proton Accelerator Research Complex), in which the gold solid target was locally melted to explosively jet molten gold. The molten gold jet collided with a structural beryllium flange plate that has a function of vacuum boundary. Some parts of molten gold were splashed and the other stuck on the flange plate. The relationship between the impact velocity and the morphology of the sticking pattern on the plate was quantitatively evaluated by introducing fractal analysis. It was found that the fractal dimension is correlated with the impact velocity and might be a useful factor to indicate the localized impact force and behavior.

scholarly journals Continuous wave Nd:YAG channel waveguide laser produced by focused proton beam writing

2010 ◽  
Vol 18 (24) ◽  
pp. 24516 ◽  
Author(s):  
Yicun Yao ◽  
Yang Tan ◽  
Ningning Dong ◽  
Feng Chen ◽  
Andrew A. Bettiol
Keyword(s):  
Proton Beam ◽  
Continuous Wave ◽  
Channel Waveguide ◽  
Waveguide Laser ◽  
Proton Beam Writing

Accelerator-Based Methods in Radio-Material 99Mo/99mTc Production Alternatives by Monte Carlo Method: The Scientific-Expedient Considerations in Nuclear Medicine

2019 ◽  
Vol 11 (01) ◽  
pp. 1930001 ◽  
Author(s):  
Abdollah Khorshidi
Keyword(s):  
Monte Carlo ◽  
Nuclear Medicine ◽  
Monte Carlo Method ◽  
Proton Beam ◽  
Proton Accelerator ◽  
Direct Reaction ◽  
Neutron Sources ◽  
Saturation Activity ◽  
Medical Facilities ◽  
Economic Criteria

Some accelerator technologies are already used for commercial [Formula: see text]Mo-99mTc production, as the economic criteria are considered representative of the main differences between diverse technologies including accelerators and reactors. This study has provided a review of known and potential [Formula: see text]Mo production using conventional medical facilities. Accelerator-based method in 99mTc production via ([Formula: see text], [Formula: see text]) direct reaction on [Formula: see text]Mo was simulated using 18[Formula: see text]MeV proton beam. Meanwhile, a conceptual design for indirect [Formula: see text]Mo production via [Formula: see text]Mo([Formula: see text])[Formula: see text]Mo and [Formula: see text]Mo(n,[Formula: see text]2n)[Formula: see text]Mo reactions was investigated when an electron source of 35[Formula: see text]MeV by accelerator is used. These indirect reactions were explored via inserted [Formula: see text]Mo samples at different positions inside the lead region. Furthermore, Adiabatic Resonance Crossing (ARC) method based on proton accelerator via transmutation in [Formula: see text]Mo([Formula: see text]Mo was examined when the 30[Formula: see text]MeV proton beam is used. Saturation activity and yield were investigated using alternative proposed methods. The potential proliferation risk associated with accelerator technetium production is minimal. While accelerators could be turned into neutron sources which could in turn be used to irradiate [Formula: see text]U to breed plutonium, and centrifuges used to enrich [Formula: see text]Mo for targets could conceivably be turned to enriching uranium, this would result in very tiny global production capability particularly compared with research or power reactors. The potential of the fresh methods could provide a replacement or complement over current reactor-based supply sources in various radioisotopes production purposes.

Soft error study on DDR4 SDRAMs using a 480 MeV proton beam

2017 ◽  
Author(s):  
Myungsang Park ◽  
SangHoon Jeon ◽  
GeunYong Bak ◽  
Chulseung Lim ◽  
Sanghyeon Baeg ◽  
...  
Keyword(s):  
Proton Beam ◽  
Soft Error ◽  
Error Study

scholarly journals Proton Beam Multiplexer Developments for Multi-Target Operation at the High-Brilliance Neutron Source HBS

2020 ◽  
Vol 231 ◽  
pp. 02002 ◽  
Author(s):  
Marius Rimmler ◽  
Johannes Baggemann ◽  
Paul Doege ◽  
Olaf Felden ◽  
Eric Mauerhofer ◽  
...  
Keyword(s):  
Proton Beam ◽  
Neutron Source ◽  
Pulse Sequences ◽  
Proton Accelerator ◽  
Beam Optics ◽  
Neutron Beams ◽  
Time Structures

The High-Brilliance neutron Source project (HBS) aims at developing a medium-flux acceleratordriven neutron source based on a 70 MeV, 100mA proton accelerator. The concept intends to optimize the facility such that it provides high-brilliance neutron beams for instruments operating at di_erent time structures. This can be realized by three di_erent target stations irradiated with di_erent proton pulse sequences. The appropriate proton pulses will be distributed by a Multiplexer unit. In the following, we present the integration of this Multiplexer with the HBS beam optics as well as ongoing developments of this unit and several components of the Multiplexer at the COSY facility in Jülich.

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

Apportionment of Impairment from Meniscal Tears and Knee Arthritis

2013 ◽  
Vol 18 (5) ◽  
pp. 1-10 ◽  
Author(s):  
Charles N. Brooks ◽  
James B. Talmage
Keyword(s):  
Medial Meniscus ◽  
Degenerative Joint Disease ◽  
Joint Disease ◽  
Detailed Knowledge ◽  
Meniscal Tears ◽  
Knee Arthritis ◽  
Degenerative Arthritis ◽  
Study Results ◽  
Physical Findings ◽  
Causation Analysis

Abstract Meniscal tears and osteoarthritis (osteoarthrosis, degenerative arthritis, or degenerative joint disease) are two of the most common conditions involving the knee. This article includes definitions of apportionment and causes; presents a case report of initial and recurrent tears of the medial meniscus plus osteoarthritis (OA) in the medial compartment of the knee; and addresses questions regarding apportionment. The authors, experienced impairment raters who are knowledgeable regarding the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), show that, when instructions on impairment rating are incomplete, unclear, or inconsistent, interrater reliability diminishes (different physicians may derive different impairment estimates). Accurate apportionment of impairment is a demanding task that requires detailed knowledge of causation for the conditions in question; the mechanisms of injury or extent of exposures; prior and current symptoms, functional status, physical findings, and clinical study results; and use of the appropriate edition of the AMA Guides. Sometimes the available data are incomplete, requiring the rating physician to make assumptions. However, if those assumptions are reasonable and consistent with the medical literature and facts of the case, if the causation analysis is plausible, and if the examiner follows impairment rating instructions in the AMA Guides (or at least uses a rational and hence defensible method when instructions are suboptimal), the resulting apportionment should be credible.

1848: Revolix 70 Watt 2 Micron Continuous Wave Laser Vaporesection of the Prostate. Preliminary Results After a One Year Follow-Up

2007 ◽  
Vol 177 (4S) ◽  
pp. 614-614
Author(s):  
Thorsten Bach ◽  
Thomas R.W. Herrmann ◽  
Roman Ganzer ◽  
Andreas J. Gross
Keyword(s):  
Continuous Wave ◽  
Continuous Wave Laser ◽  
Preliminary Results ◽  
Wave Laser ◽  
One Year

Planned Home Births Safe, Study Results Suggest

Ob Gyn News ◽  
2005 ◽  
Vol 40 (14) ◽  
pp. 11
Author(s):  
MICHELE G. SULLIVAN
Keyword(s):  
Home Births ◽  
Study Results
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