检索结果-内蒙古大学图书馆

RF electromagnetic design and multi-physics analysis of CW CH-DTL for AB-BNCT

JOURNAL OF INSTRUMENTATION 2025年第1期20卷

作者： Su, H. Q. Li, H. P. Kong, G. Q. Hu, Y. C. Li, J. L. Deng, W. T. Wang, S. Xi An Jiao Tong Univ Sch Nucl Sci & Technol Xian 710049 Peoples R China XJTU Huzhou Neutron Sci Lab Sci Valley Medium Sized Bldg 1 Huzhou 313000 Zhejiang Peoples R China Hangzhou HBNCT Co Ltd 12 Room 1503Build 1211 Fengqi E Rd Hangzhou 310000 Zhejiang Peoples R China

The accelerator-based boron neutron capture therapy (AB-BNCT) facility is being developed worldwide due to its advantages, including easy maintenance, low construction costs, and high safety. To minimize both the length and cost of the accelerator, we propose a combined acceleration structure that utilizes a radiofrequency quadrupole linac (RFQ) in conjunction with a crossbar H-mode drift tube linac (CH-DTL). The CH-DTL rapidly accelerates the beam to the required energy after the RFQ, with output energy adjustable from 2.2 MeV to 3.2 MeV. We have completed the RF electromagnetic design and optimization of the CH-DTL cavity to fulfill beam dynamics requirements while achieving high effective shunt impedance. Additionally, we designed the cooling channels and conducted multi-physics analyses to evaluate the cavity's performance during continuous wave operation.

关键词： accelerator Applications accelerator subsystems and technologies Instrumentation for particle accelerators and storage rings- low energy (linear accelerators, cyclotrons, electrostatic accelerators) Beam dynamics

来源：评论

学校读者我要写书评

暂无评论

Photon-stimulated desorption from laser-etched vacuum structural materials of accelerators

引用

JOURNAL OF INSTRUMENTATION 2025年第2期20卷 T02002-T02002页

作者： Zhang, Wenli Ma, Wenjing Ge, Xiaoqin Fan, Le Huang, Tao Fang, Jianwei Wang, Sihui Wang, Yong Univ Sci & Technol China Natl Synchrotron Radiat Lab Hefei 230029 Anhui Peoples R China

The electron multipacting (EM) and the electron cloud (e-cloud) can have detrimental impact on the operation of the high energy or high current intensity particle accelerators. The enhanced performance of new generation particle accelerators has necessitated the development of advanced structural materials and vacuum systems. The EM and e-cloud effect have emerged as significant challenges which cannot be ignored during the design and construction of these advanced accelerators. Laser-etching technique represents a promising approach for the suppression of secondary electron emission from materials, which can lower the secondary electron yield (SEY) of the structural materials to below 1. Nevertheless, the deployment of laser-etching technique in the next generation of large particle accelerators requires a comprehensive investigation into its vacuum performance. In this work, a photo-stimulated desorption (PSD) experimental beamline was constructed on the Hefei Light Source II. The PSD yields of the structural materials (oxygen-free copper, chrome zirconium copper, stainless steel, and aluminum alloy) with and without laser-etching of the vacuum chambers were tested at normal incidence using the throughput method. The main gases desorbed from all sample surfaces are H2, CO, CO2, CH4, and H2O. The initial PSD yield of laser-etched material is higher than that of unetched material. However, the PSD yield of the laser-etched material decreases at a faster rate, and after a certain photon dose, the PSD yield of the laser-etched material is in the same order of magnitude as that of the unetched material.

关键词： accelerator Applications accelerator subsystems and technologies

来源：评论

学校读者我要写书评

暂无评论

Research on accuracy testing of close-range photogrammetry for geometric feature measurement in particle accelerator

引用

JOURNAL OF INSTRUMENTATION 2025年第2期20卷 P02005-P02005页

作者： Wu, Enchen Li, Xiao Wang, Xiaolong Wang, Wei Zhang, Qiuyu Lin, Yiliang He, Xiaoye Univ Sci & Technol China Natl Synchrotron Radiat Lab Hefei 230029 Peoples R China Spallat Neutron Source Sci Ctr Dongguan 523803 Peoples R China

To meet the needs of the Hefei Advanced Light Facility project and reasonably use the close-range photogrammetric system in future alignment work. The research on the method and accuracy of the Aicon DPA close-range photogrammetry system for geometric element measurement was carried out. Using the external consistency and the internal consistency as evaluation indexes, the systems are designed and built with the laser interferometer (XL80), laser tracker (AT 960), standard tetrahedral and marble guide to test the point coordinates, distance, flatness measurement accuracy and measurement repeatability for geometric element measurement accuracy. The experimental results show that Aicon DPA point coordinates, distance, and flatness measurements have high accuracy in close-range photogrammetry. The point coordinate and flatness measurements are 9.5 mu m and 5.4 mu m, respectively, equal to or even better than the laser tracker's measurement results. Furthermore, the measurement repeatability is better than 5 mu m. The results of the simulated engineering site show that the Aicon DPA has an accuracy of 19.8 mu m, maintaining high accuracy and good immunity to environmental interference. With the expansion of the photogrammetry control range, when the length reference is shorter than the measured object, the measurement accuracy will continue to decrease. But when using the length data of the interferometer as a reference, the accuracy within 8 meters can be better than 30 mu m. The accuracy testing process and conclusion of this article have reference values for the use of close-range photogrammetry systems in particle accelerators. The close-range photogrammetry system will be fully utilized in alignment work such as geometric element measurement, deformation monitoring and data fusion with laser trackers in the Hefei Advanced Light Facility.

关键词： accelerator subsystems and technologies Detector alignment and calibration methods (lasers, sources, particle-beams) Instrumentation for particle accelerators and storage rings- high energy (linear accelerators, synchrotrons) Instrumentation for particle accelerators and storage rings- low energy (linear accelerators, cyclotrons, electrostatic accelerators)

来源：评论

学校读者我要写书评

暂无评论

Design of a 40 MeV superconducting electron linear accelerator for medical isotope production

引用

JOURNAL OF INSTRUMENTATION 2025年第4期20卷 T04005-T04005页

作者： Chen, Kexin Hou, Hongtao Liu, Zipeng Gu, Duan Deng, Haixiao Chinese Acad Sci Shanghai Adv Res Inst 99 Haike Rd Shanghai 201210 Peoples R China Shanghaitech Univ Sch Phys Sci & Technol 393 Huaxia Middle Rd Shanghai 201210 Peoples R China Zhangjiang Lab 100 Haike Rd Shanghai 201210 Peoples R China

As the demand for radiopharmaceuticals steadily increases, the importance of ensuring a stable production and supply of medical isotopes has become more critical than ever. Previous studies have explored methods for producing medical isotopes using electron linear accelerators. The accelerators used in medical isotope production are progressively requiring higher-power electron beam. This paper presents the design of a compact superconducting radio frequency accelerator delivering beam with an average current of 10 mA and an energy of 40 MeV for medical isotope production. The accelerator employs a niobium-tin superconducting radio-frequency cavity to achieve high average beam power and utilizes a conduction-cooling technique at 4 K by a cryocooler for efficient operation. The study primarily focuses on beam dynamics simulations based on 1.3 GHz 2-cell TESLA type cavities. Beam parameter optimization is performed using a Multi-Objective Genetic Algorithm in conjunction with PARMELA and ASTRA simulations. Preliminary engineering analysis indicates that the proposed design offers a promising alternative solution for medical isotope production.

关键词： accelerator Applications accelerator modelling and simulations (multi-particle dynamics single-particle dynamics) Beam dynamics accelerator subsystems and technologies

来源：评论

学校读者我要写书评

暂无评论

Design and development of high bandwidth coaxial RF combiner

引用

JOURNAL OF INSTRUMENTATION 2025年第3期20卷 P03013-P03013页

作者： Joshi, Pavan Mathew, Jose V. Kumar, Rajesh BARC Ion Accelerator Dev Div Mumbai 400085 India Homi Bhabha Natl Inst Mumbai 400094 India

The Low Energy High Intensity Proton accelerator (LEHIPA) has been commissioned to 20 MeV at BARC, India. A non-interceptive, high bandwidth wall current monitor (WCM) with 8 feedthroughs has been designed and fabricated to measure beam bunch structure at 352 MHz in LEHIPA facility. For combining the wall current signals of the WCM, a 50 Omega, 2:1 coaxial combiner has been designed. This is an economically viable alternative to the commercial wideband RF combiners. The design of the coaxial combiner is carried out using CST- Microwave Studio software and geometry is optimized based on S-parameter studies, to obtain a high bandwidth similar to 10 GHz. The design incorporates open spaces in the middle and bottom sections for ease in the mechanical assembly of the combiner. The S-parameters for the optimized combiner design are: S11 = -9.5 dB, S21 = -3.5 dB and S31 = -3.5 dB, over a wide bandwidth of 10 GHz. The combiner has been fabricated and characterised using Vector Network Analyser (VNA) and Time Domain Reflectometry (TDR) measurements. The TDR measurements showed a bandwidth of similar to 9 GHz the combiner and the measured insertion loss (S21) using VNA is around -3.5 dB. The measured values are in good agreement with the simulation results.

关键词： accelerator subsystems and technologies Beam-line instrumentation (beam position and profile monitors, beam-intensity monitors, bunch length monitors) Instrumentation for particle accelerators and storage rings- high energy (linear accelerators, synchrotrons) Instrumentation for particle accelerators and storage rings- low energy (linear accelerators, cyclotrons, electrostatic accelerators)

来源：评论

学校读者我要写书评

暂无评论

Design and development of a variable frequency high-power RF tetrode amplifier for high-energy compact proton cyclotron accelerators

引用

JOURNAL OF INSTRUMENTATION 2025年第3期20卷 T03006-T03006页

作者： Wang, Z. Y. Guo, J. Lei, Y. Fu, H. R. Cai, X. W. Li, H. J. Chen, Y. S. Yang, J. Q. Li, Y. D. Li, H. P. Lv, Y. L. Wang, S. Xi An Jiao Tong Univ Sch Nucl Sci & Technol Sch Energy & Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China SPIC NuElectron Wuxi Co Ltd 789 Dongsheng Rd Wuxi 214105 Jiangsu Peoples R China SPIC NuCreat Beijing Co Ltd 32 Haidian South Rd Beijing 100080 Peoples R China

The paper presents the design of a tetrode radio frequency (RF) amplifier system for high-current proton cyclotron accelerators used in the production of medical isotopes, targeting cyclotrons of different energy levels. The system is based on a variable frequency design with a tuning mechanism, making it adaptable to cyclotron devices operating at various energy levels and frequencies. The wideband tetrode amplifier design covers the typical cyclotron operating frequency range of 30-90 MHz, with a power output range from 50 kW to 150 kW. Based on this design, the system performance testing was conducted, and the RF system was successfully tuned and commissioned on the 50 MeV accelerator of the State Power Investment Corporation (SPIC), achieving satisfactory results. The design and testing procedures of the variable frequency RF amplifier will be discussed in this paper.

关键词： accelerator subsystems and technologies Instrumentation for particle accelerators and storage rings- low energy (linear accelerators cyclotrons electrostatic accelerators) Beam-line instrumentation (beam position and profile monitors beam-intensity monitors bunch length monitors)

来源：评论

学校读者我要写书评

暂无评论

Femtosecond-level laser-microwave synchronization based on an all-fiber optical-microwave phase detector

引用

JOURNAL OF INSTRUMENTATION 2025年第3期20卷 P03008-P03008页

作者： Zeng, Hao Gan, Nan Xu, Hang Feng, Liwen He, Xiang Huang, Senlin Li, Xiaoping Ma, Xinpeng Xu, Jinqiang Xu, Xueyi Li, Jingyi Chinese Acad Sci Key Lab Particle Accelerat Phys & Technol Inst High Energy Phys Beijing 100049 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China Peking Univ Sch Phys State Key Lab Nucl Phys & Technol Beijing 100871 Peoples R China Peking Univ Inst Heavy Ion Phys Sch Phys Beijing 100871 Peoples R China

A laser-microwave synchronization system using an all-fiber optical-microwave phase detector (AFOM-PD) has been developed and experimentally validated at the Institute of High Energy Physics (IHEP). A Yb-doped fiber amplifier (YDFA) was employed to suppress the relative intensity noise (RIN) of the reference laser. And the root-mean-square (RMS) integrated RIN was reduced from 7.78 x 10-4 before suppression to 6 x 10-5 after suppression in the interval of 1 Hz to 1 MHz. The performance of this system has been demonstrated using a mode-locked fiber laser with a repetition rate of 29.1 MHz, in conjunction with L-band and S-band microwave signals. Residual phase noise levels of -118 dBc/Hz and -116 dBc/Hz at the 1-Hz offset frequency have been achieved for the L-band and S-band microwave signals, respectively. The integrated RMS timing jitters measured within the frequency range of 1 Hz to 1 MHz during the same experiments are 18.6 fs for the L-band signals and 6.0 fs for the S-band signals. Tests conducted over a 6-hour period have shown that this system can achieve a long-term RMS timing drift of less than 16 fs. This system has potential applications in the plasma wakefield accelerator currently being developed at IHEP.

关键词： accelerator subsystems and technologies Instrumentation for FEL

来源：评论

学校读者我要写书评

暂无评论

A high repetition rate millimeter wavelength accelerator for an X-ray free-electron laser

引用

JOURNAL OF INSTRUMENTATION 2025年第1期20卷 P01023-P01023页

作者： Zholents, A. Baturin, S. Doran, S. Jansma, W. Fedurin, M. Kasa, M. Kusche, K. Lee, S. Nassiri, A. Piot, P. Popovic, B. Qian, M. Siy, A. Sorsher, S. Suthar, K. Trakhtenberg, E. Waldschmidt, G. Xu, J. Argonne Natl Lab Lemont IL 60439 USA Northern Illinois Univ Dept Phys De Kalb IL 60115 USA ITMO Univ Sch Phys & Engn St Petersburg 197101 Russia Brookhaven Natl Lab Upton NY 11973 USA Los Alamos Natl Lab Los Alamos NM 87545 USA Univ Wisconsin Madison WI 53706 USA Quaise Energy Cambridge MA 02138 USA

A compact collinear wakefield accelerator has been designed for an X-ray free-electron laser capable of operating at a pulse repetition rate in the tens of kilohertz. The maximum achievable accelerating gradient has been determined, with its limitation linked to beam breakup instability. fabrication techniques for the principal components of the accelerator including wakefield generation, couplers for excess power extraction and diagnostics, focusing quadrupoles, and a novel undulator have been discussed. Results from various laboratory and beam-based tests on these components have been compared to their original design specifications and demonstrated very good agreement. preliminary design for the XFEL has been presented, featuring a novel small-period, force-neutral, adjustable-phase undulator.

关键词： accelerator subsystems and technologies Wake-field acceleration (laser-driven, electron-driven) accelerator modelling and simulations (multi-particle dynamics, single-particle dynamics)

来源：评论

学校读者我要写书评

暂无评论

How simply one can considerably improve performance of the Gas Stripper at the GSI UNILAC

引用

JOURNAL OF INSTRUMENTATION 2025年第1期20卷 T01013-T01013页

作者： Varentsov, Victor Facil Antiproton & Ion Res Europe FAIR Planckstr 1 D-64291 Darmstadt Germany

In this report, we propose a simple way how considerably improve the performance of the gas stripper setup at the GSI Universal Linear accelerator (UNILAC) in Germany. In our proposed approach, we replace inside the main GSI stripper chamber the current nozzle and the short windowless storage gas cell (for the pulsed gas jet operation mode) with a simple conical diverging nozzle combined with a gas catcher tube placed on the gas jet axis at some distance downstream from the nozzle exit. As a result, the background pressure in the main and differentially pumped adjacent vacuum chambers of the gas stripper at the GSI UNILAC dramatically reduces, making it possible to achieve the required optimal thickness of the gas targets. The pulsed gas stripper operation is realized by implementing a commercially available fast gas valve connected to the nozzle entrance. Moreover, the ion beam pulse repetition rate can be increased, allowing for a considerably higher average intensity of the ion beams extracted from the GSI UNILAC. We explored the performance of the proposed GSI UNILAC gas stripper modification by means of detailed computer experiments, which provide a realistic description of supersonic gas jets flowing out of the nozzle into the vacuum. The results of these computer experiments have presented and discussed.

关键词： accelerator subsystems and technologies Instrumentation for heavy-ion accelerators Instrumentation for particle accelerators and storage rings- low energy (linear accelerators, cyclotrons, electrostatic accelerators)

来源：评论

学校读者我要写书评

暂无评论

Comprehensive overview of materials, sealing methods and vulnerabilities of UHV systems for particle accelerators

引用

JOURNAL OF INSTRUMENTATION 2025年第3期20卷 T03002-T03002页

作者： Davtyan, A. Isunts, H. Azizov, A. Avagyan, V. CANDLE Synchrotron Res Inst 31 Acharyan Str Yerevan 0022 Armenia Natl Polytech Univ Armenia 105 Teryan Str Yerevan 0009 Armenia

With the development of modern science and technology, the use and modernization of particle accelerators are becoming more relevant and promising. Research and experiments in the field of elementary particle physics are carried out on various types of accelerator equipment. The modernization is based on improving both the characteristics of the entire accelerator and some parameters of its specific unit or even a sub-unit. It is apparent that almost all accelerator components have flanges that are used in different places for their intended purpose. In particular, for connecting waveguides of different diameters, connecting any unit measuring devices, vacuum gauges, or direct closure of the unit. The degree of sealing of the flanges has a strong influence on the beam parameters since the degree of vacuum has a great impact on the working parameters of the beam. Austenitic stainless steel, high-strength aluminum alloys and dispersion-strengthened copper alloys are used as materials for flange connections. These materials have limited parameters in terms of strength characteristics. Repeated assembly and disassembly of such joints leads to subsequent deformation of the flanges. This phenomenon limits the multiple uses of flanges. Thus, the work studied the currently known standard and non-standard models of ultrahigh vacuum flanges, gaskets, and methods of their sealing. As the main purpose of the overview, further research issues to be solved are derived.

关键词： accelerator subsystems and technologies Instrumentation for particle accelerators and storage rings- high energy (linear accelerators, synchrotrons) Instrumentation for particle accelerators and storage rings- low energy (linear accelerators, cyclotrons, electrostatic accelerators)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：