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Power losses caused by longitudinal HOMs in 1.3-GHz cryomodule of SHINE

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Nuclear Science and Techniques 2019年第7期30卷 16-26页

作者： Jun-Jie Guo Qiang Gu Meng Zhang Zhen Wang jian-hao tan Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China

Shanghai high-repetition-rate XFEL and extreme light facility (SHINE), the first hard XFEL based on a superconducting accelerated structure in China, is now under development at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences. In this paper, power losses caused by trapped longitudinal high-order modes (HOM), steady-state loss, and transient loss generated by untrapped HOMs in the 1.3-GHz SHINE cryomodule are investigated and calculated. The heat load generated by resistive wall wakefields is considered as well. Results are presented for power losses of every element in the 1.3-GHz cryomodule, caused by HOM excitation in the acceleration RF system of the continuouswave linac of SHINE.

关键词： Power loss Higher-order modes (HOMs) Resistive wall wakefields Impedance Superconducting cavities

Design optimization and cold RF test of a 2.6-cell cryogenic RF gun

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Nuclear Science and Techniques 2021年第9期32卷 84-93页

作者： Cheng Wang jian-hao tan Xiao-Xia Huang Yi-Xing Lu Lin Wang Wen-Cheng Fang Zhen-tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Chinese Academy of SciencesShanghai 201204China

To further improve the performance of acceler-ators,the first cryogenic normal-conducting RF gun in China was designed and *** a new and attractive trend,this optimized cryogenic RF gun can generate a low-emittance beam with a short-driven laser pulse because of its promising high gradient on the *** this paper,optimization of the RF design and beam dynamics,including suppression of the peak RF field and elimination of the multipole mode,is *** addi-tion,the emittance growth caused by the alignment devi-ation and RF jitter is *** the gun was manufactured,a cold test was conducted at both room temperature and cryogenic *** room tempera-ture,the field distribution was obtained by the bead pull *** cryogenic conditions,the RF properties,such as the coupling coefficient and quality factor,varied with *** test results agreed with the *** the cryogenic test,vibration measurements were *** vibration isolation,a maximum vibration of 50 lm was *** cold test results are the basis of the following high-power test.

关键词： Photoinjector Cryogenic structure C-band Cold test

Design,fabrication,and cold test of an S-band high-gradient accelerating structure for compact proton therapy facility

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Nuclear Science and Techniques 2021年第4期32卷 38-48页

作者： Yu Zhang Wen-Cheng Fang Xiao-Xia Huang jian-hao tan Cheng Wang Chao-Peng Wang Zhen-tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China ShanghaiTech University Shanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

An S-band high-gradient accelerating structure is designed for a proton therapy linear accelerator(linac)to accommodate the new development of compact,singleroom facilities and ultra-high dose rate(FLASH)*** optimize the design,an efficient optimization scheme is applied to improve the simulation *** S-band accelerating structure with 2856 MHz is designed with a low beta of 0.38,which is a difficult structure to achieve for a linac accelerating proton particles from 70 to 250 MeV,as a high gradient up to 50 MV/m is required.A special design involving a dual-feed coupler eliminates the dipole field *** paper presents all the details pertaining to the design,fabrication,and cold test results of the S-band high-gradient accelerating structure.

关键词： S-band High gradient Accelerating structure Compact Single-room facility Dual-feed coupler Cold test

Static superconducting gantry‑based proton CT combined with X‑ray CT as prior image for FLASH proton therapy

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Nuclear Science and Techniques 2023年第1期34卷 125-135页

作者： Yu‑Qing Yang Wen‑Cheng Fang Xiao‑Xia Huang jian‑hao tan Cheng Wang Chao‑Peng Wang Zhen‑tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Proton FLASH therapy with an ultra-high dose rate is in urgent need of more accurate treatment plan system(TPS)to promote the development of proton computed tomography(CT)without intrinsic error compared with the transformation from X-ray *** paper presents an imaging mode of proton CT based on static superconducting gantry different from the conventional rotational *** beam energy for proton CT is fixed at 350 MeV,which is boosted by a compact proton linac from 230 MeV,and then delivered by the gantry to scan the patient’s body for proton *** study demonstrates that the static superconducting gantry-based proton CT is effective in clinical *** particular,the imaging mode,which combines the relative stopping power(RSP)map from X-ray CT as prior knowledge,can produce much a higher accuracy RSP map for TPSs and positioning and achieve ultra-fast image for real-time image-guided *** paper presents the conceptual design of a boosting linac,static superconducting gantry and proton CT imaging *** feasibility of energy enhancement is verified by simulation,and results from Geant4 simulations and reconstruction algorithms are presented,including the simulation verification of the advantage of the imaging mode.

关键词： Proton therapy Proton CT FLASH treatment Real-time image-guided radiotherapy

Study on crab-cavity-based longitudinal injection scheme and prototype realization of C-band crab cavity for electron storage rings

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Nuclear Science and Techniques 2023年第7期34卷 137-147页

作者： Guan-Hua Wang Bo-Cheng jiang jian-hao tan Qing-Lei Zhang Wen-Cheng Fang Chang-Liang Li Kun Wang Xiao-Xia Huang Sheng-Li Pu University of Shanghai for Science and Technology Shanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Laboratory for Ultrafast Transient Facility Chongqing UniversityChongqing 401331China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

A diffraction-limited storage ring with a multi-bend achromat lattice suffers from a small dynamic aperture for conventional off-axis ***,a longitudinal on-axis injection scheme based on a new type of crab cavity is proposed in this *** tracking simulations were performed to study the disturbance of the stored beam and the motion of the injected beam during the injection *** possibility of multi-bunch injections was *** addition,the effect of the long-range wake field induced by the stored beam was analyzed.A C-band standing-wave crab cavity was designed and produced as requested,and its field distribution was *** corresponding results are consistent with the simulation results.

关键词： On-axis injection Crab cavity Bump orbit Wakefield

Radio frequency conditioning of an S-band accelerating structure prototype for compact proton therapy facility

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Nuclear Science and Techniques 2021年第6期32卷 94-107页

作者： Yu Zhang Wen-Cheng Fang Xiao-Xia Huang jian-hao tan Shao-Peng Zhong Cheng-Cheng Xiao Jun-Qiang Zhang Cheng Wang Yu-Qing Yang Zhen-tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Tech University Shanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

The development of a high-gradient accelerating structure is underway to construct a compact proton linear accelerator for cancer *** experiments and numerous studies are being conducted to develop compact linear accelerators for proton *** of the electromagnetic and mechanical design has been performed to simplify the manufacturing process and reduce costs.A novel high-gradient structure with a low relativistic proton velocity(β),v/c=0.38,was designed,fabricated,and tested at high *** first full-scale prototype was also successfully tested with high radio frequency(RF)power,a repetition rate of 50 Hz,and pulse length of 3μs to reach a high-gradient of 46 MV/m using a 50 MW S-band klystron power supply obtained from the Shanghai Soft X-ray Free Electron Laser *** is the first high-power test in China,which is in line with the expected experimental *** study presents preliminary high-power testing of S-band standing wave accelerating structures with 11 *** work aims to verify the feasibility of using a high-gradient RF accelerating structure in compact proton therapy *** cold test of the prototype cavity was completed in *** of the high-power RF test setup,the process of RF conditioning,and the high-power results are described.

关键词： S-band Standing wave(SW) High-gradient Accelerating structure RF conditioning

Design,fabrication,and cold-test results of C-band spherical RF pulse compressor prototype

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Radiation Detection Technology and Methods 2019年第3期3卷 37-44页

作者： Zong‑Bin Li Wen‑Cheng Fang Qiang Gu jian‑hao tan Xiao‑Xia Huang Zhen‑tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

Purpose Pulse compressor is a useful and common RF structure for Free Electron Laser and Linear Collider Facilities, whichcan improve the input power of accelerating structures *** In this study, we designed, fabricated and tested a prototype of a compact C-band spherical pulse *** pulse compressor utilizes one high Q0 spherical RF resonant cavity that works with two degenerated TE1,1,3modes anda dual-mode polarized coupler. The cavity and coupler were designed and machined separately and then brazed *** prototype was tested carefully using vector network analyzer, and a cold-test system was set up to check the workingconditions of the spherical pulse compressor with inversed input powerResults Associated with the C-band high-gradient accelerating structures, the peak power gain and energy multiply factorcan be as high as 6.1 and 1.85, respectively, in theory. The average power gain is 3.8 in the first 0.372 μs after the phasereverse, which is the accelerator filling time. During the cold test, a peak power multiply factor of 6.04 and an energy multiplyfactor of 1.83 were *** The test results agreed with the design well. The prototype was successfully made as a pre-research for thefuture energy multiplying scheme of SXFEL.

关键词： Pulse compressor C-band Spherical RF measurements Cold test

Proton linac-based therapy facility for ultra-high dose rate (FLASH) treatment

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Nuclear Science and Techniques 2021年第4期32卷 1-9页

作者： Wen-Cheng Fang Xiao-Xia Huang jian-hao tan Chao-Peng Wang Cheng-Cheng Xiao Yi-Xing Lu Yu Zhang Yu-Qing Yang Yi-Ming Xu Han-Yu Gong Jun-Qiang Zhang Shao-Peng Zhong Zhen-tang Zhao Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China University of Chinese Academy of Sciences Beijing 100049China Shanghai APACTRON Particle Equipment Company Limited Shanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

As an advanced treatment method in the past five years,ultra-high dose rate(FLASH)radiotherapy as a breakthrough and milestone in radiotherapy development has been verified to be much less harmful to healthy tissues in different *** treatments require an instantaneous dose rate as high as hundreds of grays per second to complete the treatment in less than 100 *** proton therapy facilities with the spread-out of the Bragg peak formed by different energy layers,to our knowledge,cannot easily achieve an adequate dose rate for FLASH treatments because the energy layer switch or gantry rotation of current facilities requires a few seconds,which is relatively long.A new design for a therapy facility based on a proton linear accelerator(linac)for FLASH treatment is proposed *** is designed under two criteria:no mechanical motion and no magnetic field *** new therapy facility can achieve an ultrahigh dose rate of up to 300 Gy/s;however,it delivers an instantaneous dose of 30 Gy within 100 ms to complete a typical FLASH *** design includes a compact proton linac with permanent magnets,a fast beam kicker in both azimuth and elevation angles,a fixed gantry with a static superconducting coil to steer proton bunches with all energy,a fast beam scanner using radio-frequency(RF)deflectors,and a fast low-level RF *** relevant principles and conceptual proposals are presented herein.

关键词： Proton therapy FLASH Proton linac Deflector Superconducting coil Fast scanner

Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第1期68卷 317-328页

作者： Qingmin Yang jian Zhao Yujia Zhang Xingyu Zhou hao Ren Bowen Hu Zhongli Lei Lixin Chen Peng Yang School of Material and Chemical Engineering Bengbu University Anhui Provincial Engineering Laboratory of Silicon-Based Materials School of Chemistry and Chemical Engineering Northwestern Polytechnical University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical Engineering Shaanxi Normal University International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal University

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular economy. Herein, we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal ions. Our method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical reagents. Amyloid-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces, resulting in a remarkable ～3.1 times improvement in the adsorption capacity of fly ash, a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB). The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins, activated carbon(AC), covalent organic frameworks(COFs), and metal-organic frameworks(MOFs). We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste leachates. Consequently, this strategy could increase the value of waste materials nearly 27 times. In addition, this method is generally extendable to other conventional industrial adsorbents such as resin, clay, and Al2O3, and enhances their adsorption capabilities at least twofold. Overall, this work provides a simple and green approach for improving the adsorption performance of solid particles, and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

关键词： amyloid-like protein aggregates surface engineering fly ash solid waste adsorption