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A new compact structure for a high intensity low-energy heavy-ion accelerator

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Chinese Physics C 2013年第12期37卷 84-87页

作者：王志军何源 A.A.Kolomiets 刘淑会杜晓楠贾欢李超王旺生陈熙萌 Institute of Modern Physics Chinese Academy of Sciences School of Nuclear Science and Technology Lanzhou University University of Chinese Academy of Sciences Institute for Theoretical and Experimental Physics

A new compact accelerating structure named Hybrid RFQ is proposed to accelerate a high-intensity low-energy heavy ion beam in HISCL （high Intensive heavy ion SuperConducting Linear accelerator）, which is an injector of HIAF （Heavy Ion Advanced Research Facility）. It is combined by an alternative series of acceleration gaps and RFQ sections. The proposed structure has a high accelerating ability compared with a conventional RFQ and is more compact than traditional DTLs. A Hybrid RFQ is designed to accelerate 238U34＋ from 0.38 MeV/u to 1.33 MeV/u. The operation frequency is described to be 81.25 MHz at CW （continuous wave） mode. The design beam current is 1.0 mA. The results of beam dynamics and RF simulation of the Hybrid RFQ show that the structure has a good performance at the energy range for ion acceleration. The emittance growth is less than 5% in both directions and the RF power is less than 150 kW. In this paper, the results of beam dynamics and RF simulation of the Hybrid RFQ are presented.

关键词： Hybrid RFQ high intensity heavy ion linac compact structure

Test Stand Design and Construction for high intensity Cyclotron Developement

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Chinese Physics C 2008年第z1期32卷 237-240页

作者：张天爵李振国储诚节姚红娟葛涛纪彬钟俊晴中国原子能科学研究院北京102413

In order to study the technology on cyclotron design,and to carry out researches on the crucial parts including the main magnet,beam diagnostics and engineering technology to accomplish the experimental verification of the 100MeV high intensity cyclotron and to pave the way for further increasing the current of the proton beam,a series of work has been done in succession since 2004,which highlights the research,design and fabrication of some of the critical *** technical requirement for each part has been reached *** present,all the work has been integrated into a set of comprehensive device,CRM Cyclotron,which is actually a test stand for high intensity cyclotron *** report will lay emphasis on the following:the CRM Cyclotron design and fabrication of relevant equipment,magnetic field mapping and shimming,10—15mA H- ion source,experimental research on RF cavity and injection system,beam commissioning on the internal target system,etc.

关键词： high intensity proton beam cyclotron magnet beam diagnostics

Physical mechanism of the rapid increase in intense and long-lived extreme heatwaves in the Northern Hemisphere since 1980

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Science China Earth Sciences 2024年第7期67卷 2103-2121页

作者： Yuqing WANG Wen ZHOU Chunzai WANG Key Laboratory of Polar Atmosphere-ocean-ice System for Weather and Climate of the MOE Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric SciencesFudan UniversityShanghai 200438China Key Laboratory for Polar Science of the MNR Polar Research Institute of ChinaShanghai 201209China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Global Ocean and Climate Research Center South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Since 1980,both the intensity and duration of summer heatwaves in the middle and high latitudes of the Northern Hemisphere have significantly increased,leading this region to become a critical area for a significant increase in the frequency of intense and long-lived extreme *** found that stronger and more persistent high-pressure systems and lower soil moisture before the events were the main drivers of intense and long-lived extreme heatwaves in western Europe and the middle and high latitudes of North ***,in eastern Europe and Siberia,lower cloud cover before events is also a main driver of this type of extreme heatwave,in addition to the above *** factors are coupled with each other and can change heatwave intensity and duration by influencing surface radiation processes during *** the self-organizing map classification method,we found that 6 weather patterns with increased frequency,intensity,and duration were the main dynamic reasons leading to the increase in intense and long-lived extreme heatwaves after *** addition,the decrease in summer average soil moisture in most areas of the mid-high latitudes of the Northern Hemisphere and the decrease in average cloud cover in eastern Europe and Siberia are found to be the main thermodynamic reasons leading to the increase in these extreme heatwaves.

关键词： high intensity Long duration Extreme heatwaves high pressure system Soil moisture Cloud cover

Commissioning experiences with the spoke-based CW superconducting proton linac

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Nuclear Science and Techniques 2021年第10期32卷 12-29页

作者： Fang Yan Hui-Ping Geng Cai Meng Ya-Liang Zhao Hua Shi Hua-Fu Ouyang Tong-Min Huang Fei-Si He Jian-Li Wang Rui Ge Yan-Feng Sui Qiang Ye Rong Liu Qun-Yao Wang Sheng-Chang Wang Jian-She Cao Wei-Min Pan Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy Physics(IHEP)Chinese Academy of ScienceBeijing 100049China Beijing Normal University Beijing 100875China

The 10-MeV Accelerator-Driven Subcritical(ADS)system Injector-I test stand at the Institute of high Energy Physics(IHEP)is a testing facility dedicated to demonstrating the feasibility of the spoke-based super-conducting(SC)linear accelerator(linac)for the ADS project in *** injector adopted a four-vane copper structure radio frequency quadrupole(RFQ)with an output energy of 3.2 MeV and an SC section accommodating 14 β_(g)=0.12 single spoke cavities,14 SC solenoids,and 14 cold beam position monitors(BPMs).A 10-MeV pulsed beam with a beam current of 10 mA and a 2-mA continuous wave(CW)beam were successfully shooting *** commissioning results confirmed the feasibility of using a 325-MHz spoke-type cavity for accelerating the proton beam in the low β and medium β *** paper describes the results achieved,the difficulties encountered,and the experiences obtained during commissioning.

关键词： Superconducting proton linac Spoke cavity high intensity CW commissioning

Beam halo experiment at IHEP

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Chinese Physics C 2013年第3期37卷 79-83页

作者：彭军黄涛刘华昌蒋洪平李鹏李芳李健刘美飞慕振成孟飞孟鸣欧阳华甫荣林艳田建民王标王博徐韬光徐新安姚远辛文曲赵富祥曾磊周文中 Accelerator Center Institute of High Energy PhysicsChinese Academy of Sciences

Space-charge forces acting in mismatched beams have been identified as a major cause of beam halo. In this paper,we describe the beam halo experimental results in a FODO beam line at IHEP. With this beam transport line, experiments are carried out to compare the measured data with the multi-particle simulations and to study the formation of a beam halo. The maximum measured amplitudes of the matched and mismatched beam profiles agree well with simulations. Details of the experiment are presented.

关键词： high intensity proton halo multi-particle simulation

Ultra-compact post-compressor on-shot wavefront measurement for beam correction at PHELIX

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high Power Laser Science and Engineering 2022年第3期10卷 2-10页

作者： J.B.Ohland U.Eisenbarth B.Zielbauer Y.Zobus D.Posor J.Hornung D.Reemts V.Bagnoud GSI Helmholtzzentrum für Schwerionenforschung 64291DarmstadtGermany Institute for Applied Physics Technische Universität Darmstadt64289 DarmstadtGermany Institute of Nuclear Physics Technische Universität Darmstadt64289 DarmstadtGermany Helmholtz-Institut Jena 07743 JenaGermany

In order to reach the highest intensities,modern laser systems use adaptive optics to control their beam ***,the focal spot is optimized after the compression stage of the system in order to avoid spatio-temporal *** also requires a wavefront sensor after the compressor,which should be able to measure the wavefront *** PHELIX,we have developed an ultra-compact post-compressor beam diagnostic due to strict space constraints,measuring the wavefront over the full aperture of 28 *** system features all-reflective imaging beam transport and a high dynamic range in order to measure the wavefront in alignment mode as well as on shot.

关键词： adaptive optics beam quality high intensity laser diagnostics on shot Strehl wavefront