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1.
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A continuous-wave superconducting linear accelerator scheme for the drive beam acceleration of the Compact Linear Collider
/ Liu, Jiayang (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI ; CERN) ; Grudiev, Alexej (CERN) ; Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI ; CERN) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
The Compact Linear Collider (CLIC) utilizes two 2.5-km-long normal-conducting linear accelerators (LINACs) to produce a drive beam with 140μs pulse length at a repetition rate of 50 Hz. This setup is relatively expensive in the early stages due to both the length of the drive beam LINACs and the amount of the power sources for one drive beam complex are the same in all energy stages. [...]
2021 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1006 (2021) 165328
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2.
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Tolerance study of travelling-wave accelerating structure for the main linac of the klystron-based first stage of Compact Linear Collider
/ Liu, Jiayang (Tsinghua U., Beijing ; Tsinghua U., Beijing ; CERN) ; Shi, Jiaru (Tsinghua U., Beijing ; Tsinghua U., Beijing) ; Grudiev, Alexej (CERN) ; Zha, Hao (Tsinghua U., Beijing ; Tsinghua U., Beijing) ; Chen, Huaibi (Tsinghua U., Beijing ; Tsinghua U., Beijing)
This work aims to analyse the tolerances given by two effects on the performance of the travelling-wave accelerating structure: the reflection along the structure and the change in the nominal accelerating voltage, which is essential for the projects with a large number of accelerating structures. The detuning and dephasing caused by systematic temperature shifts, systematic geometric errors and random geometric errors has been investigated in this paper. [...]
2020 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 981 (2020) 164499
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3.
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Analysis and simulation of the "after-pulse" RF breakdown
/ Lin, Xiancai (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Liu, Zening (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Wu, Xiaowei (CERN) ; Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
During the high power experiment of a single-cell standing-wave accelerating structure, it was observed that many RF breakdowns happen when the field inside cavity is decaying after the input rf pulse is off. The distribution of breakdown timing shows a peak at the moment of RF power switches off. [...]
CERN-ACC-2019-133.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPGW047
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW047
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4.
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Wakefield suppression in the main linac of the klystron-based first stage of CLIC at 380 GeV
/ Liu, Jiayang (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Grudiev, Alexej (CERN) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
An alternative klystron-based scenario for the first stage of Compact Linear Collider (CLIC) at 380 GeV centre-of-mass energy was proposed. To preserve the beam stability and luminosity of CLIC, the beam-induced transverse long-range wakefield in main linac must be suppressed to an acceptable value. [...]
CERN-ACC-2019-213; CLIC-Note-1188.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPRB043
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB043
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5.
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Demonstration of a cavity-based pulse compression system for pulse shape correction
/ Jiang, Yuliang (Tsinghua U., Beijing) ; Zha, Hao (Tsinghua U., Beijing) ; Wang, Ping (Tsinghua U., Beijing) ; Shi, Jiaru (Tsinghua U., Beijing) ; Chen, Huaibi (Tsinghua U., Beijing) ; Millar, William L (CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Syratchev, Igor (CERN)
A compact X-band correction cavity chain (CC) has been successfully designed, fabricated and high power tested for the Compact Linear Collider (CLIC) project. The CC consists of eight spherical cavities and four polarizers, and each spherical cavity has a $Q_0$ of 45 000 and a diameter of 7 cm. [...]
2019 - 6 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 082001
External link: Fulltext
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6.
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Fabrication and Cold Test of the Correction Cavity Chain for Klystron-Based CLIC
/ Wang, Ping (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Cao, Dezhi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Wang, Zhihui (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
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. [...]
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAL155
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAL155
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7.
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High-gradient breakdown studies of an X -band Compact Linear Collider prototype structure
/ Wu, Xiaowei (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Shi, Jiaru (Tsinghua U., Beijing ; CERN ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing) ; Shao, Jiahang (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Abe, Tetsuo (KEK, Tsukuba) ; Higo, Toshiyasu (KEK, Tsukuba) ; Matsumoto, Shuji (KEK, Tsukuba) ; Wuensch, Walter (CERN)
A Compact Linear Collider prototype traveling-wave accelerator structure fabricated at Tsinghua University was recently high-gradient tested at the High Energy Accelerator Research Organization (KEK). This X-band structure showed good high-gradient performance of up to 100 MV/m and obtained a breakdown rate of $1.27×10^{−8}$ per pulse per meter at a pulse length of 250 ns. [...]
2017 - 11 p.
- Published in : Phys. Rev. Accel. Beams 20 (2017) 052001
Fulltext: PDF;
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8.
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Higher‐order mode absorption measurement of X-band choke-mode cavities in a radial line structure
/ Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI ; CERN) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI ; CERN) ; Wu, Xiaowei (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
An experiment is presented to study the higher-order mode (HOM) suppression of X-band choke-mode structures with a vector network analyzer (VNA). Specific radial line disks were built to test the reflection from the corresponding damping load and different choke geometries. [...]
2016 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 814 (2016) 90-95
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9.
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Beam-induced wakefield observation in X -band choke-mode cavities
/ Zha, Hao (Tsinghua U., Beijing ; Argonne, HEP ; CERN) ; Jing, Chunguang (Argonne, HEP ; Euclid Techlabs, Solon) ; Qiu, Jiaqi (Argonne, HEP ; Euclid Techlabs, Solon) ; Wisniewski, Eric E (Argonne, HEP) ; Conde, Manoel (Argonne, HEP) ; Power, John G (Argonne, HEP) ; Doran, Darrell S (Argonne, HEP) ; Liu, Wanming (Argonne, HEP) ; Shi, Jiaru (Tsinghua U., Beijing ; CERN) ; Li, Chen (Tsinghua U., Beijing ; Argonne, HEP) et al.
The X-band choke-mode structure is currently being studied as an alternative design for the accelerating structure of the compact linear collider (CLIC) main linac. The geometry of the choke-mode structure is designed to ensure the strong suppression of the beam-induced long-range transverse wakefield and therefore maintain the stability and quality of the beam in the CLIC main linac. [...]
2016 - 9 p.
- Published in : Phys. Rev. Accel. Beams 19 (2016) 081001
Fulltext: PDF;
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10.
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High Power Test of X-band Single Cell HOM-free Choke-mode Damped Accelerating Structure made by Tsinghua University
/ Wu, Xiaowei (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Abe, Tetsuo (KEK, Tsukuba) ; Chen, Huaibi (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Higo, Toshiyasu (KEK, Tsukuba) ; Shi, Jiaru (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Wuensch, Walter (CERN) ; Zha, Hao (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.)
As an alternative design for CLIC main accelerating structures, X-band choke-mode damped structures had been studied for several years. However, the performance of choke-mode cavity under high power is still in lack of research. [...]
CERN-ACC-2016-129; CLIC-Note-1105.-
2016 - 3 p.
- Published in : 10.18429/JACoW-IPAC2016-THPOR043
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR043
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