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Dual-mode high-voltage sawtooth wave buncher for low-energy ion injection at HIRFL-SFC cyclotron

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Abstract

Background

Sawtooth wave buncher is widely used in low-energy ion injection at cyclotron accelerators. Its performance significantly impacts on the intensity of ion beam delivered to experimental terminals. In order to meet the high-intensity requirement of physical experiments, we upgrade the existing B02 buncher in the axial injection line of the SFC with the dual-model sawtooth wave buncher for low-energy ion injection.

Methods

We use a three harmonics synthesis method in the dual-sawtooth wave buncher. First, we use three harmonics to generate a low-level sawtooth wave. Second, the low-level wave is amplified by a broadband amplifier to generate high voltage at a single-gap electrode. Third, the electrode is matched to the amplifier by a 1:9 transmission line transformer.

Results

The new buncher has been installed online since September 2022. Our tested results show that the buncher is capable of being operated at the full-frequency mode and half-frequency mode with the corresponding frequency ranging from 2.75 to 8.0 MHz and 5.5 to 16.0 MHz, respectively. The effective voltage can be up to 2.54 kV and 1.6 kV, respectively. Also, the sawtooth wave buncher works reliably, and a 4.5–8.6 times gain in the beam intensity is achieved.

Conclusion

By using the three-harmonic synthesis method, a new dual-mode high-voltage sawtooth wave buncher has been built. This sawtooth wave buncher has succeeded in being applied with the high buncher voltage over a wide frequency range with good reliability and stability. This newly-built sawtooth wave buncher significantly increases the ion beam current for low-energy ion injection at the HIRFL-SFC cyclotron.

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Funding

The funding was provided by Chinese Academy of Sciences, (Y9HIRLL100), National Natural Science Foundation of China, (11975289), Yan Cong.

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Ruifeng Zhang, Zhe Xu, **anwu Wang, Yan Cong, Shilong Li, **aodong Han & Xueming Su

  2. University of Chinese Academy of Sciences, Bei**g, 100049, China

    Ruifeng Zhang

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  1. Ruifeng Zhang
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  2. Zhe Xu
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  3. **anwu Wang
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  4. Yan Cong
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  5. Shilong Li
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  6. **aodong Han
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  7. Xueming Su
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Correspondence to Ruifeng Zhang or Zhe Xu.

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Zhang, R., Xu, Z., Wang, X. et al. Dual-mode high-voltage sawtooth wave buncher for low-energy ion injection at HIRFL-SFC cyclotron. Radiat Detect Technol Methods (2023). https://doi.org/10.1007/s41605-023-00434-9

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  • DOI: https://doi.org/10.1007/s41605-023-00434-9

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