Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector
We demonstrate an experimental methodology for measuring the temporal distribution of pico-second level electron bunch with low energy using radial electric and azimuthal magnetic fields of an accelerating ( TM 01 mode) radio frequency (RF) cavity that is used for accelerating electron beams in a li...
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| Veröffentlicht in: | Scientific reports 2020-11, Vol.10 (1), p.18905-18905, Article 18905 |
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| creator | Hwang, Ji-Gwang Miyajima, Tsukasa Honda, Yosuke Kim, Eun-San |
| description | We demonstrate an experimental methodology for measuring the temporal distribution of pico-second level electron bunch with low energy using radial electric and azimuthal magnetic fields of an accelerating (
TM
01
mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field (
E
0
) of 7.21 MV/m. |
| doi_str_mv | 10.1038/s41598-020-76054-w |
| format | Article |
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TM
01
mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field (
E
0
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TM
01
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E
0
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TM
01
mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field (
E
0
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| subjects | 639/766/1960 639/766/530 639/766/930 Energy Energy recovery Experimental methods Humanities and Social Sciences Magnetic fields multidisciplinary Science Science (multidisciplinary) Temporal distribution |
| title | Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector |
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