1.
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Schottky-Enabled Photoemission and Dark Current Measurements-Toward an Alternate Approach to Fowler-Nordheim Plot Analysis
/ Wisniewski, E E (IIT, Chicago ; Argonne (main)) ; Gai, W (Argonne (main)) ; Power, J (Argonne (main)) ; Du, Y (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Hua, J (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Yan, L (Tsinghua U., Beijing, Dept. Eng. Phys.) ; You, Y (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Chen, H (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Huang, W (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Tang, C (Tsinghua U., Beijing, Dept. Eng. Phys.) et al.
Field-emitted dark current, a major gradient-limiting factor in RF cavities, is usually analyzed via FowlerNordheim (FN) plots. Traditionally, field emission is attributed to geometrical perturbations on the bulk surface whosefield enhancement factor (beta) and the emitting area (A) can be extracted from the FN plot. [...]
2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. TUPPD069
External link: Published from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.1563-1565
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2.
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Commissioning Status of the 3 MeV RFQ for the Compact Pulsed Hadron Source (CPHS) at Tsinghua University
/ Xing, QZ (Tsinghua U., Beijing, KLPRI) ; Young, LM (TechSource, Santa Fe) ; Stovall, J (CERN) ; He, Y (Tsinghua U., Beijing) ; Guan, WQ (Tsinghua U., Beijing) ; Du, L (Tsinghua U., Beijing, KLPRI) ; Cheng, C (Tsinghua U., Beijing, KLPRI) ; Cai, JC (Tsinghua U., Beijing, KLPRI) ; Bin, DT (Tsinghua U., Beijing) ; Bai, YJ (Tsinghua U., Beijing, Dept. Eng. Phys.) et al.
The 3 MeV Radio Frequency Quadrupole (RFQ) accelerator for the Compact Pulsed Hadron Source (CPHS) is in its initial stage for the commissioning at Tsinghua University. Braze of the flanges was completed in January, 2012. [...]
2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. THPPC014
External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.3305-3307
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3.
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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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4.
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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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5.
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Stable 500 kW average power of infrared light in a finesse 35 000 enhancement cavity
/ Lu, X -Y (IJCLab, Orsay ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Chiche, R (IJCLab, Orsay) ; Dupraz, K (IJCLab, Orsay) ; Johora, F (IJCLab, Orsay) ; Martens, A (IJCLab, Orsay) ; Nutarelli, D (IJCLab, Orsay) ; Peinaud, Y (IJCLab, Orsay) ; Soskov, V (IJCLab, Orsay) ; Stocchi, A (IJCLab, Orsay) ; Zomer, F (IJCLab, Orsay) et al.
Advances in laser technology over the past 25 years have been impressive, in particular, for the Ytterbium technology where, nowadays, kilowatt-class laser systems are available. This technology also led to the possibility to provide hundreds of kilowatts of laser power by the use of enhancement cavities. [...]
2024 - 7 p.
- Published in : Appl. Phys. Lett. 124 (2024) 251105
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6.
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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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7.
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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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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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Optimization on RF parameters of a Choke-Mode Structure for the Clic Main LINAC
/ Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys.)
A tapered choke-mode structure for the main linac of Compact Linear Collider (CLIC) had been designed. Wakefield suppression of this structure fits the beam dynamic requirements. [...]
2013 - 3 p.
- Published in : (2013) , pp. TUPME026
Fulltext: PDF; External link: Published version from JACoW
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.TUPME026
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10.
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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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