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Venturi tube application in high power test of the SRF module

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Nuclear Science and Techniques 2009年第3期20卷 129-132页

作者： MA Guangming LIU Jianfei hou hongtao MA Zhenyu FU Zechuan ZHANG Zhigang ZHAO Zhentang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Shanghai Key Lab. of Cryogenics ＆ Superconducting RF Technology Shanghai 201800 China

In the superconducting RF module, the dissipation power of the niobium cavity is an important parameter. In the Superconducting radio frequency (SRF) module's acceptance test at Shanghai Synchrotron Radiation Facility (SSRF), the Venturi tube is used to measure the quality factor of SRF cavity at 4.2 K. During the test, the venturi tube is be calibrated by increasing heat load with internal heater. In this paper, the horizontal test principle and venturi effect are briefly introduced. The authors find out a correct way to calibrate the venturi tubes, the calibration results are presented here. From the calibration results, one can deduce the static loss of each module, the source of static loss is also analyzed.

关键词：文氏管加热器核技术研究

Beam trip diagnostic system at SSRF

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Nuclear Science and Techniques 2009年第5期20卷 261-264页

作者： hou hongtao ZHAO Shenjie LUO Chen ZHAO Yubin ZHANG Zhigang FENG Ziqiang MAO Dongqing LIU Jianfei Shanghai Institute of Applied Physics CAS Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Shanghai KEY Laboratory of Cryogenics ＆ Superconducting RF Technology Shanghai 201800 China

In this paper we report the design and realization of beam trip diagnostic system at Shanghai Synchrotron Radiation Facility (SSRF). The system can find out the first fault signal in the key operation signals related to the RF system by analyzing the time sequence, also it can decide which trips occurs first among the three superconducting RF stations. All the states of monitored signals in a time period ahead and behind beam trip are recorded. The results are compared with those from other diagnostic tools at SSRF. The work is of help in improving reliability of the superconducting RF system and stability of the storage ring operation.

关键词： SSRF 核技术同步辐射光源辐射装置

Design of large aperture 500 MHz 5-cell superconducting cavity

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Nuclear Science and Techniques 2012年第5期23卷 257-260页

作者： WEI Yelong LIU Jianfei hou hongtao MA Zhenyu MAO Dongqing FENG Ziqiang LU Changwang YU Haibo Shanghai Institute of Applied Physics Chinese Academy of Sciences Jiading Campus Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology Shanghai 201800 China

With the potential application of Energy Recovery Linac (ERL), the superconducting (SC) cavities were developed to deliver much higher current than before. Nowadays, the current of the international SC accelerator designed has already exceeded 100 mA. This paper presents the design of a new 500 MHz 5-cell SC cavity (SINAP 5-cell cavity), in which the parameters r/Q= 515.5 of the fundamental mode and the geometry factor G=275.8 are under an acceptable Radio Frequency (RF) field level (B peak /E acc =4.31 mT/MV/m and E peak /E acc =2.48). This design employs a larger beam pipe to propagate the Higher Order Modes (HOMs) out of the cavity and increases the damping efficiently for the dangerous HOMs. By simulation technique, it has been found that almost all the dangerous HOMs (including TE 111 , TM 110 , and TM 011 ) can be propagated into the beam pipe and are absorbed by ferrite absorbers, when the beam pile is enlarged. Finally, the loss factor for the new 5-cell cavity is also calculated.

关键词：超导腔设计直线加速器光圈无线电频率能量回收几何因子模拟技术

Tracking code simulation for passive harmonic cavity in the SSRF storage ring

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Radiation Detection Technology and Methods 2018年第1期2卷 57-64页

作者： Thanapong Phimsen Bocheng Jiang hongtao hou Shunqiang Tian Manzhou Zhang Qinglei Zhang Kun Wang Zhentang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesZhangjiang campusShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China ShanghaiTech University Shanghai 201210China

Background A passive third harmonic cavity is planned to install in the Shanghai Synchrotron Radiation Facility(SSRF)storage ring to increase the beam *** beam loading effect generated by the gap between the bunch trains can suppress the bunch lengthening effect of the third harmonic ***,the field excited in the passive operation of the harmonic cavity depends on the bunch *** To estimate the effect of transient beam loading,the tracking codes have been *** The tracking simulation has been performed for three uniform filling cases and a nonuniform filling *** lengthened bunch distribution has also been included into tracking code *** effect of the lengthened bunch has also been *** The uniform filling pattern with shorter bunch trains shows lower transient beam loading effect and can give much higher bunch lengthening factors compared to those of non-uniform filling *** effect caused by the reduction of the harmonic voltage generated by lengthened bunch distribution causes a great reduction on bunch lengthening effect in uniform filling case,while the lengthening factor of non-uniform filling case does not affect much in this *** The tracking codes have been developed to estimate the effect of transient beam loading for three uniform filling cases and a non-uniform filling *** larger gap in the filling pattern can cause the higher transient beam loading effect and lower bunch lengthening *** lengthened bunch distribution has also been included into tracking code *** effect of the lengthened bunch has also been *** more the bunch is lengthened,the greater reduction on bunch lengthening effect.

关键词： SSRF storage ring Transient beam loading

Cr含量对铸态和热处理后AlCr_(x)CuFeNi高熵合金微观组织和硬度的影响

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金属热处理 2024年第10期49卷 239-245页

作者：侯宏涛郑州工业应用技术学院基础教学部河南新郑451150

采用电弧熔炼工艺制备了AlCr_(x)CuFeNi(x=0,1.0,2.0)高熵合金(记为Cr_(0)、Cr_(1.0)和Cr_(2.0)合金),研究了Cr含量对高熵合金铸态和600℃热处理后的微观组织和显微硬度的影响。结果表明,铸态条件下,Cr_(0)合金的物相结构主要由富Fe、Ni... 详细信息

采用电弧熔炼工艺制备了AlCr_(x)CuFeNi(x=0,1.0,2.0)高熵合金(记为Cr_(0)、Cr_(1.0)和Cr_(2.0)合金),研究了Cr含量对高熵合金铸态和600℃热处理后的微观组织和显微硬度的影响。结果表明,铸态条件下,Cr_(0)合金的物相结构主要由富Fe、Ni的FCC固溶体相和AlCu3相组成,而Cr_(1.0)和Cr_(2.0)合金均由富Cu的FCC2相、富Cr、Fe的BCC相和AlNi相组成。600℃热处理后,高熵合金的物相结构基本未发生改变,具有良好的物相稳定性,且合金的元素偏析程度显著改善。Cr_(0)合金铸态显微硬度为348HV10,600℃热处理后略增至370HV10。随Cr含量提高,高熵合金的硬度随之增加,其中Cr_(2.0)合金铸态和600℃热处理后的显微硬度最高,分别达到435和462HV10。热处理后合金硬度增加主要与固溶强化、析出强化和细晶强化机制有关。

关键词： Cr含量高熵合金热处理微观组织显微硬度

Great progress in developing 500 MHz single cell superconducting cavity in China

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 169-173页

作者： LIU JianFei hou hongtao MAO DongQing FENG ZiQiang MA ZhenYu LUO Chen ZHAO ShenJie ZHAO YuBin YU HaiBo YIN Bo ZHANG ZhiGang ZHENG Xiang LI Zheng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Graduate University of Chinese Academy of Sciences Beijing 100049China Shanghai Key Laboratory of Cryogenics&Superconducting RF Technology Shanghai 201800China

Superconducting cavities have been adopted in many kinds of accelerator facilities such as synchrotron radiation light source, hard X-ray free electron laser linac, colliders and energy recovery linacs (ERL). The 500 MHz superconducting cavities will be a candidate to be installed in the high current accelerators and high current ERLs for their large beam aperture, low higher order modes impedance and high current threshold value. This paper presents great progress in the whole sequence of developing 500 MHz superconducting cavity in China. It describes the first in-house successful development of 500 MHz single cell superconducting cavity including the deep-drawing of niobium half cells, electron beam wielding of cavity, surface preparations and vertical testing. The highest accelerating gradient of the fabricated cavity #SCD-02 higher than 10 MV/m was obtained while the quality factor was better than 4×108 at 4.2 K, which has reached the world level of the same kind of cavities.

关键词： superconducting cavity deep-drawing electron beam welding surface processing vertical test accelerating performance

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激光衍射法测量金属丝直径

应用激光 2024年第8期44卷 47-62页

作者：侯宏涛郑州工业应用技术学院基础教学部河南郑州451150

为提高金属丝直径测量准确度,讨论激光衍射测量法的实验方案。首先根据夫琅禾费单缝衍射暗纹产生的条件,推导出计算狭缝缝宽的理论公式,由巴比涅定理,同为互补障碍物的细丝与狭缝可以产生相同的衍射图样,因此可用测量狭缝缝宽的方法测... 详细信息

为提高金属丝直径测量准确度,讨论激光衍射测量法的实验方案。首先根据夫琅禾费单缝衍射暗纹产生的条件,推导出计算狭缝缝宽的理论公式,由巴比涅定理,同为互补障碍物的细丝与狭缝可以产生相同的衍射图样,因此可用测量狭缝缝宽的方法测量金属丝的直径。然后对金属丝衍射光强分布测量的实验步骤进行了详细阐述。最后根据实验数据,通过传统计算法和规划求解法分别求解出金属丝直径。对比两种方法可知,利用规划求解法求解金属丝直径的准确度可以继续提高。通过以上研究,不仅提高了金属丝直径的计算精度,而且对金属丝直径的测量具有一定的指导意义。

关键词：衍射金属丝直径传统法规划求解法对比分析

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传统法与规划求解法计算单缝缝宽对比分析

应用激光 2024年第2期44卷 131-137页

作者：侯宏涛郑州工业应用技术学院基础教学部河南郑州451150

为研究夫琅禾费单缝衍射中单缝的缝宽,首先根据夫琅禾费单缝衍射暗纹产生的条件,推导出计算单缝缝宽的理论公式,根据公式,主要计算了实验中衍射中心条纹到各级暗纹间的距离。然后对测量单缝衍射光强分布的实验方法进行了详细阐述。最后... 详细信息

为研究夫琅禾费单缝衍射中单缝的缝宽,首先根据夫琅禾费单缝衍射暗纹产生的条件,推导出计算单缝缝宽的理论公式,根据公式,主要计算了实验中衍射中心条纹到各级暗纹间的距离。然后对测量单缝衍射光强分布的实验方法进行了详细阐述。最后根据实验数据,通过传统计算法和规划求解法分别求解出单缝缝宽。对比两种方法,利用规划求解法求解缝宽,准确度可以进一步提高。通过以上研究,不仅提高了缝宽的计算精度,而且对单缝缝宽的测量具有一定的指导意义。

关键词：单缝衍射缝宽传统法规划求解法对比分析

Simulation of higher order modes and loss factor of a new type of 500-MHz single cell superconducting cavity at SSRF

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Nuclear Science and Techniques 2011年第5期22卷 257-260页

作者： YU Haibo LIU Jianfei hou hongtao LU Changwang WEI Yelong MA Zhenyu FENG Ziqiang MAO Dongqing Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Shanghai Key Lab of Cryogenics ＆ Superconducting RF Technology Shanghai 201800 China

In this paper,higher order modes(HOMs) and loss factor of a new type of 500-MHz superconducting cavity is studied,by simulating its broadband HOMs damping at different positions of the ferrite HOM-absorber and different lengths of the *** results show that the impedance and Q value of the HOMs in transverse and longitudinal modes could be greatly *** HOM longitudinal impedance could be damped to meet the requirement of SSRF beam instability *** calculated loss factor of the new SC cavity was compared with cavities at *** was estimated that the HOM absorber could absorb a total power of 3.16 kW at 4-mm beam bunch length.

关键词：损耗因子高阶模超导腔光源上海模拟单细胞纵向阻抗