Paper |
Title |
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MOPML070 |
Thermal and Stress Analysis of an X-Ray Target for 6 MeV Medical Linear Accelerators |
572 |
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- Z.H. Wang, H.B. Chen, J. Shi, H. Zha
TUB, Beijing, People's Republic of China
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We present an optimal design of an X-ray target for 6 MeV medical linear accelerators using FLUKA simula-tions. The target is composed of high-atomic number tungsten and high-thermal conductivity copper, corre-sponding water-cooling system is showed too. Further-more, we analyse the temperature and thermal stress re-sponses of the target under transient thermal loads using Ansys Code. For 6 MeV electron beam with 100 uA cur-rent, the results show that the target can achieve 1014 cGy/min at 1meter in front of the target. Within 100 ms, the maximum temperature reaches 512 °C under pulsed heating source with 250 Hz frequency and 1' duty cycle and the number of cycles to failure is estimated as 5.8·108.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-MOPML070
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THPAL149 |
RF System Based on Two Klystrons and Phase Modulation for Photo-Cathode Injector |
3996 |
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- P. Wang, D.Z. Cao, H.B. Chen, J. Shi, Z.H. Wang, H. Zha
TUB, Beijing, People's Republic of China
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We proposed an RF system with two klystrons, of which the powers are combined by a 3dB-hybrid. By managing the phases of the two klystrons respectively, the two pulses from the two output ports of the 3dB-hybrid can be of different powers, phases, and shapes. One of the two pulses can be set to an RF gun, while the other one can feed traveling accelerating structures. Two methods of phase modulation were proposed based on this scheme. Comparing with the state-of-art RF system, the new one can be of high efficiency or can generate electron beams with higher energy. The detailed analysis of the two methods and some experiments are described in this paper.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL149
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THPAL153 |
High Power Test of the S-Band Spherical Pulse Compressor at Tsinghua University |
4008 |
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- P. Wang, D.Z. Cao, H.B. Chen, C. Cheng, J. Shi, Z.H. Wang, H. Zha
TUB, Beijing, People's Republic of China
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We designed, fabricated and high power tested an S-band spherical pulse compressor for the high-power test facility at Tsinghua University. The pulse compressor comprises a spherical resonant cavity with an unloaded quality factor of 100, 000 and an RF polarizer with two rectangular ports and a circular port. To achieve high efficiency and large power gain, the coupling coefficient was optimized to 8 with input pulse length of 3.6 us and compression ratio of 12. After conditioning the RF system, the pulse compressor generated RF pulses with peak power of more than 400MW. And during the operation, the pulse compressor has very low breakdown rate and was extremely stable.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL153
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THPAL155 |
Fabrication and Cold Test of the Correction Cavity Chain for Klystron-Based CLIC |
4014 |
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- P. Wang, D.Z. Cao, H.B. Chen, J. Shi, Z.H. Wang, H. Zha
TUB, Beijing, People's Republic of China
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A proposed RF scheme based on correction cavity chain and storage cavity (CC-SC scheme) for klystron-based CLIC has the ability to generate flat output pulses. In the scheme, the correction cavity chain modulates the amplitude of the input pulse, while the storage cavity compresses the amplitude-modulated pulse. Resonant cavities of the correction cavity chain are of a relatively low unloaded quality factor and of small size, which results in the compactness of the RF scheme. The first prototype of a correction cavity chain was fabricated and cold tested at Tsinghua University and then delivered to CERN for high power test. Both the results of the cold and high power tests show that the correction cavity chain is of good performance. Feasibility and stability of the pulse compression system based on CC-SC scheme were demonstrated.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL155
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THPAL156 |
High-Power Test of a Compact X-Band RF Rotary Joint |
4017 |
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- J. Liu, H.B. Chen, J.Q. Qiu, J. Shi, Z.H. Wang, X.W. Wu, H. Zha
TUB, Beijing, People's Republic of China
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A compact X-band (9.3 GHz) RF rotary joint has been developed in the accelerator laboratory of Tsinghua University. Cold measurements on the rotary joint using Vector-Network showed good results. In recent high-power tests, the RF rotary joint was operated under a 1.6 MW X-band magnetron. The incident power, the transmitted power and the pulse width of this rotary joint have been measured. The transmitted power kept stable in different rotation angle. In this paper, the setup and results of the high-power tests of this RF rotary joint are presented.
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※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL156
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THPAL157 |
Investigation of Transverse Wakefield and Beam Break Up Effect in Irradiation Linacs |
4020 |
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- X.C. Meng, H.B. Chen, J. Shi, Z.H. Wang, H. Zha, S.X. Zheng
TUB, Beijing, People's Republic of China
- G.H. Li, J.S. Liu, Y.H. Liu
NUCTECH, Beijing, People's Republic of China
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Study of beam break up effect in linacs has been done in recent years. The beam-induced high order dipolar modes, especially the TM11-like mode were investigated for the linacs both in travelling wave and backward trav-elling wave. Measurements of beam-break up in a travel-ling wave linac were carried out and results are discussed. Moreover, a theoretical model was developed for the irradiation linacs to study the detailed interaction be-tween the transverse wakefield and the electron beam.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL157
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THPAL158 |
Development of an Half-Cell Accelerating Structure in Tsinghua |
4023 |
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- M.M. Peng, W. Gai, J. Shi, Z.H. Wang, H. Zha
TUB, Beijing, People's Republic of China
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The half-cell high gradient accelerating structure is attractive for its easy manufacturing and good alignment. A structure with 12 cells has been designed for the frequency of 11.424 GHz and a cold test will be conducted. Two different mechanical factory manufacture with same machining drawing and the results will be compared.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2018-THPAL158
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THPML047 |
Design and Measurement of the X-Band Pulse Compressor for TTX |
4745 |
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- Y.L. Jiang, H.B. Chen, C. Cheng, W. Gai, J. Shi, P. Wang, Z.H. Wang, X.W. Wu, H. Zha
TUB, Beijing, People's Republic of China
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A radio frequency (RF) pulse compressor had been designed for the X-band (11.424 GHz) high power test stands at the Accelerator Laboratory of Tsinghua University. It is the SLED-I type pulse compressor, which uses a high quality factor corrugated circular cavity to store the RF power. An RF polarizer couples two quadrature modes into the cavity so that the pulse compressor needs only one cavity. The cavity implements HE1-1-14 mode, with the Q0 of 115, 000 and the coupling factor (β) of 3.23. The design and the microwave measurement before brazing of this pulse compressor are presented in this paper.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-THPML047
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