Design, fabrication, and testing of low-group-velocity S-band traveling-wave accelerating structure

Xian-Cai Lin; Hao Zha; Jia-Ru Shi; Liu-Yuan Zhou; Yi-Fan Liang; Jian  Gao; Qiang  Gao; Huai-Bi  Chen; Chuan-Xiang  Tang

doi:10.1007/s41365-022-01124-9

Your Location：

Home >

Browse articles >

Design, fabrication, and testing of low-group-velocity S-band traveling-wave accelerating structure

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2022-12-16

- Design, fabrication, and testing of low-group-velocity S-band traveling-wave accelerating structure
- Nuclear Science and Techniques Vol. 33, Issue 11, Article number: 147(2022)
- Affiliations：
  
  1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  2.Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
- Author bio：
  
  * shij@mail.tsinghua.edu.cn
- Funds：
- DOI：10.1007/s41365-022-01124-9
  CLC：
Scan for full text
Xian-Cai Lin, Hao Zha, Jia-Ru Shi, et al. Design, fabrication, and testing of low-group-velocity S-band traveling-wave accelerating structure. [J]. Nuclear Science and Techniques 33(11):147(2022)
DOI：

Xian-Cai Lin, Hao Zha, Jia-Ru Shi, et al. Design, fabrication, and testing of low-group-velocity S-band traveling-wave accelerating structure. [J]. Nuclear Science and Techniques 33(11):147(2022) DOI： 10.1007/s41365-022-01124-9.

摘要

Abstract

To implement the Tsinghua Thomson Scattering X-ray Source (TTX) upgrade plan and the Very Compact Inverse Compton Scattering Gamma-ray Source (VIGAS) program, a new 1.5-m traveling-wave accelerating structure was designed to replace the old 3-m SLAC-type structure with the aim of increasing the accelerating gradient from 15 to 30 MV/m. The new type of structure works in the 3π/4 mode with a comparatively low group velocity varying from 0.007,c, to 0.003,c, to increase the accelerating gradient at a given power. An elliptical iris was employed to reduce the surface field enhancement. The filling process of the low-group-velocity structure was analyzed using a circuit model. After fabrication, the structure was precisely tuned using the non-contact tuning method, followed by detailed low-power radiofrequency measurements. The structure was first installed and utilized at a beamline for the Terahertz experiment at Tsinghua University. After 120 h of conditioning, it is now operating at a gradient of 24.2 MV/m and a 20.7-MW input power, with the klystron operating at its full power. It is expected to generate an accelerating gradient of 30 MV/m when the klystron power is upgraded to 30 MW in the near future.

关键词

Keywords

Traveling-wave accelerating structureCavity optimizationTuning methodHigh-power test

references

R. B. Neal and J. P. Blewett, The Stanford two-mile accelerator. Physics Today 23(3), 76-77 (1970). doi: 10.1063/1.3022031http://doi.org/10.1063/1.3022031

G. Bienvenu, J. C. Bourdon, P. Brunet et al., Accelerating Structure Developments for the LEP Injector Linacs (LIL), in Proceedings of the 1984 Linear Accelerator Conference, Seeheim, Germany (1984).

J. Arthur, P. Anfinrud, P. Audebert et al., Linac Coherent Light Source (LCLS) Conceptual Design Report, 2002. doi: 10.2172/808719http://doi.org/10.2172/808719

D. Alesini, S. Bertolucci, M. E. Biagini et al., The SPARC project: a high-brightness electron beam source at LNF to drive a SASE-FEL experiment, vol. 507, 2003, pp. 345-349. doi: 10.1016/S0168-9002(03)00943-4http://doi.org/10.1016/S0168-9002(03)00943-4

J.-Y. Raguin, The Swiss FEL S-Band Accelerating Structure: RF Design, in Proceedings of LINAC2012(2012).

S. Thorin, F. Curbis, N. Cutic et al., The MAX IV Linac and first design for an upgrade to 5 Gev to drive an X-ray FEL, in Proceedings of FEL(2013).

C. Tang, W. Huang, R. Li et al., Tsinghua Thomson scattering X-ray source. Nucl. Instrum. Methods Phys. Res. Sect. A 608, S70-S74 (2009). doi: 10.1016/j.nima.2009.05.088http://doi.org/10.1016/j.nima.2009.05.088

D. Alesini, M. Bellaveglia, M. E. Biagini et al., Design, realization and test of C-band accelerating structures for the SPARC_LAB linac energy upgrade. Nucl. Instrum. Methods Phys. Res. Sect. A 837, 161-170 (2016). doi: 10.1016/j.nima.2016.09.010http://doi.org/10.1016/j.nima.2016.09.010

C. Vaccarezza, D. Alesini, M. P. Anania et al., The SPARC_LAB Thomson source. Nucl. Instrum. Methods Phys. Res. Sect. A 829, 237-242 (2016). doi: 10.1016/j.nima.2016.01.089http://doi.org/10.1016/j.nima.2016.01.089

D. Gamba, R. Corsini, S. Curt et al., The CLEAR user facility at CERN. Nucl. Instrum. Methods Phys. Res. Sect. A 909 (2017), 480-483 (2017). doi: 10.1016/j.nima.2017.11.080http://doi.org/10.1016/j.nima.2017.11.080

Y. Han, F.-G. Angeles, C. Vallerand et al., Optics design and beam dynamics simulation for a VHEE radiobiology beam line at PRAE accelerator. J. Phys. Conference Series 1350, 012200 (2019). doi: 10.1088/1742-6596/1350/1/012200http://doi.org/10.1088/1742-6596/1350/1/012200

W.-C. Fang, X.-X. Huang, J.-H. Tan et al., Proton linac-based therapy facility for ultra-high dose rate (FLASH) treatment. Nucl. Sci. Tech. 32, 34 (2021). doi: 10.1007/s41365-021-00872-4http://doi.org/10.1007/s41365-021-00872-4

M. Peng, J. Shi, H. Zha et al., Development and high-gradient test of a two-half accelerator structure. Nucl. Sci. Tech. 32, 60 (2021). doi: 10.1007/s41365-021-00895-xhttp://doi.org/10.1007/s41365-021-00895-x

D. Cao, J. Shi, H. Zha et al., Electromagnetic and mechanical design of high gradient S-band accelerator in TTX, in 13th Symposium on Accelerator Physics(2018).

H. Chen, Y. Du, L. Yan et al., Optimization of the compact gamma-ray source based on inverse compton scattering design, in 2018 IEEE Advanced accelerator concepts workshop (AAC), IEEE(2018).

L. Zheng, Y. Du, Z. Zhang et al., Development of S-band photocathode RF guns at Tsinghua University. Nucl. Instrum. Methods Phys. Res. Sect. A 834, 98-107 (2016). doi: 10.1016/j.nima.2016.07.015http://doi.org/10.1016/j.nima.2016.07.015

J. Liu, J. Shi, A. Grudiev et al., Analytic RF design of a linear accelerator with a SLED-I type RF pulse compressor. Nucl. Sci. Tech. 31, 107 (2020). doi: 10.1007/s41365-020-00815-5http://doi.org/10.1007/s41365-020-00815-5

X.-C. Lin, H. Zha, J.-R. Shi et al., Fabrication, tuning, and high-gradient testing of an X-band traveling-wave accelerating structure for VIGAS. Nucl. Sci. Tech. 33, 102 (2022). doi: 10.1007/s41365-022-01086-yhttp://doi.org/10.1007/s41365-022-01086-y

T. P. Wangler, RF Linear accelerators, John Wiley & Sons, 2008.

N. Shafqat, C. Serpico and T. G. Lucas, Design and high-power test of a short prototype of high gradient S-band accelerating structure for the FERMI free electron laser linac upgrade. Nucl. Instrum. Methods Phys. Res. Sect. A 979, 164473 (2020). doi: 10.1016/j.nima.2020.164473http://doi.org/10.1016/j.nima.2020.164473

Y. Igarashi, S. Yamaguchi, Y. Higashi et al., High-gradient tests on an S-band accelerating structure, in Proc. of the 21st International Linac Conference, LINAC2002, Korea(2002).

D. Cao, J. Shi, H. Zha et al., S-band accelerating structure for high-gradient up-grade of TTX, in Proceedings of IPAC2017(2017).

https://www.cst.comhttps://www.cst.com

W. Fang, D. Tong, Q. Gu et al., Design and experimental study of a C-band traveling-wave accelerating structure. Chin. Sci. Bull. 56, 18-23 (2011). doi: 10.1007/s11434-010-4265-2http://doi.org/10.1007/s11434-010-4265-2

J. Shi, A. Grudiev and W. Wuensch, Tuning of X-band traveling-wave accelerating structures. Nucl. Instrum. Methods Phys. Res. Sect. A 704, 14-18 (2012). doi: 10.1016/j.nima.2012.11.182http://doi.org/10.1016/j.nima.2012.11.182

X. Huang, Dissertation, Shanghai Institute of Applied Physics, Chinese Academy of Sciences 2017

J. Shi, Dissertation, Tsinghua University, 2009

R. M. Jones, V. A. Dolgashev and J. W. Wang, Dispersion and energy compensation in high-gradient linacs for lepton colliders. Phys. Rev. ST - Accelerators and Beams 12, 051001 (2009). doi: 10.1103/PhysRevSTAB.12.051001http://doi.org/10.1103/PhysRevSTAB.12.051001

J. Shi, S. Zheng and H. Chen, Calculating field distribution of a linear accelerator using equivalent circuit model. High Energy Physics and Nuclear Physics 30, 699-703 (2006). doi: 10.1111/j.1745-7254.2006.00260.xhttp://doi.org/10.1111/j.1745-7254.2006.00260.x

X. Lin, H. Zha, J. Shi et al., Development of a seven-cell S-band standing-wave RF-deflecting cavity for Tsinghua Thomson scattering X-ray source. Nucl. Sci. Tech. 32, 36 (2021). doi: 10.1007/s41365-021-00871-5http://doi.org/10.1007/s41365-021-00871-5

W. Fan, A. Lu, L. L. Wai et al., Mixed-mode S-parameter characterisation of differential structures, in Proceedings of the 5th Electronics Packaging Technology Conference (EPTC 2003)(2003). doi: 10.1109/EPTC.2003.1271579http://doi.org/10.1109/EPTC.2003.1271579

C. W. Steele, A nonresonant perturbation theory. IEEE Trans. Microwave Theory Tech. 14, 70-74 (1966). doi: 10.1109/TMTT.1966.1126168http://doi.org/10.1109/TMTT.1966.1126168

Y. Igarashi, S. Yamaguchi, Y. Higashi et al., High-gradient tests on S-band 2m-long accelerating structures for KEKB injector linac. in Particle Accelerator Conference(2003). doi: 10.1109/PAC.2003.1289738http://doi.org/10.1109/PAC.2003.1289738

Views

Downloads

CSCD

Alert me when the article has been cited

Submit

Tools

Publicity Resources

Fabrication, tuning, and high-gradient testing of an X-band traveling-wave accelerating structure for VIGAS

Related Author

No data

Related Institution

No data

Address：Editorial Office of NST, 2019 Jialuo Road, Jiading, Shanghai 201800, China Postal code：201800
Email：nst@sinap.ac.cn
Technical support is provided by Beijing Founder electronics co., LTD 沪ICP备05005479号-1 京公网安备11010802024621
It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.

⁰