Measurement of Characteristic of X-band RF Cavity for 6 MeV Electron Linac
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A compact 6 MeV electron linear accelerator (linac), intended to be used as an X-ray source for a dual-head gantry radiotherapy system has been developed. In order to meet the size requirements of the dual-head gantry machine, an X-band radio frequency (RF) technology is used, which facilitates a reduction in the size of the linac, which is nine times smaller than the conventional medical purpose linac using S-band RF technology. Nevertheless, the X-band RF technology requires much higher machining precision and higher-quality surface finish owing to the electrical breakdown phenomena resulting from its small size. After the design was completed, the RF cavity was machined using high-precision machining technology, achieving machining tolerances of ±2 μm, and a surface roughness less than 50 nm. Various RF properties were measured in the fabricated RF cavity by using a network analyzer, and the distribution of the electric field generated in the RF cavity was verified by a bead-pull measurement technique. RF conditioning and beam commissioning experiments were performed, following the fabrication and tuning of the RF cavity.
KeywordsX-band Electron linac RF cavity
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- Y. B. Kim and C. O. Suh, Evolution of Radiotherapy: High precision Radiotherapy (2008), p. 604.Google Scholar
- Accuray Inc., (n.d.), www.accuray.com.Google Scholar
- S. Hanna, Applications of X-band technology in medical accelerators, Proc. 1999 Part. Accel. Conf. (1999), p. 2516, doi:10.1109/PAC.1999.792751.Google Scholar
- V. Dolgashev, High gradient, X-band and above, metallic RF structures (2015).Google Scholar
- A. Tropp, Studies of vacuum discharges in the CLIC accelerating structure (Lund University, 2016).Google Scholar
- J. C. Slater, Phys. Today. 3, 3 (1950), doi:10.1063/ 1.3066836.Google Scholar
- H. Klein, Cern 92-03 1, 112 (1992).Google Scholar
- P. Schmuser, Tuning of Multi-Cell Cavities using Bead Pull Measurements (1992).Google Scholar
- Z. Ma, RF properties of high-temperature superconducting materials (Stanford University, 1995), https://search.proquest.com/docview/304219227?accountid=11840.Google Scholar
- S. Ghosh, A. Mandal, S. Seth and S. S. Som, Conf. Proc. C110904, 280 (2011).Google Scholar