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TUPB001 |
Research on Electromagnetic Structure and Transverse Dynamics of RFQ accelerator over 700MHz | |
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| The purpose of this research is to explore the dynamic and RF characteristics of RFQ with working frequency greater than 700 MHz, and to form a reliable RFQ physical design that meets the requirements of S-band linear accelerator injector. When the working frequency is increased to more than 700 MHz, the volume of RFQ will be reduced, but there will be many physical problems. The characteristics from 700MHz to 1.5GHz RFQ were studied on the beam dynamics. Based on the results of small acceptance RFQ commissioning, the design of the radial section and the control of beam loss were completed, and the RFQ design with a frequency of 750MHz was obtained with the energy of 2MeV, a length of 92.77cm, and an acceleration gradient of 2.15MV/m. The transmission efficiency is 94.4%. The RF characteristics from 700MHz to 1.5GHz RFQ were studied, and the RF design with a frequency of 750MHz was obtained, the power loss was 200W/mm, the Q₀ value was 7540, the flatness of the electric field was within ±2%, and the largest field asymmetry was 6.7%. We have designed, constructed, and cold-test the 750MHz cavity, the measured results are in agreement with simulated one. | ||
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TUPB038 |
Beam Dynamics Design of a 100 mA RFQ with Low Emittance Growth | |
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| The control of beam emittance growth in high-current Radio Frequency Quadrupole (RFQ) accelerators is a major challenge, given the strong space charge effect. While many international high power accelerator projects have successfully controlled transverse beam emittance growth in RFQs, longitudinal beam emittance remains significant and can negatively impact beam transmission in the downstream accelerating structures, particularly in super-conducting sections. This study focuses on beam dynamics design for a 100 mA proton RFQ linac. The dynamic parameters of the RFQ are well adjusted with particular attention paid to both transverse and longitudinal beam dynamics to control the emittacne growth. Beam dynamics simulations were performed using the codes TRACEWIN and TOUTATIS. The analysis of reasons for emittance growth and RFQ beam losses are performed, and the results of error studies of the RFQ are presented. | ||
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