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FRAC: Fringing-RF-field-activated dc-to-pulse converter for low-energy ion beams
M Wakasugi1, M Togasaki1, T Ohnishi1
1RIKEN Nishina Center for Accelerator Based Science, Wako, Saitama 351-0198, Japan.
The Review of Scientific Instruments
|October 4, 2018
Summary
Researchers developed a novel Fringing-RF-field-Activated dc-to-pulse Converter (FRAC) for low-energy ion beams. This device efficiently converts continuous ion beams into intense pulses, achieving up to 22% conversion efficiency.
Area of Science:
- Physics
- Accelerator Science
- Ion Beam Technology
Background:
- Low-energy ion beams require specialized conversion techniques for pulsed applications.
- Existing methods may lack efficiency or intensity for certain scientific needs.
Purpose of the Study:
- To introduce and characterize a new dc-to-pulse converter for low-energy ion beams.
- To evaluate the conversion efficiency and performance of the FRAC device.
Main Methods:
- Development of a Fringing-RF-field-Activated dc-to-pulse Converter (FRAC) utilizing radio-frequency quadrupole (RFQ) linear trap principles.
- Investigation of ion deceleration and accumulation via alternating longitudinal electric fields in distorted RFQ edge fields.
- Analysis of FRAC performance at various operation frequencies (10 Hz and 1 Hz).
Main Results:
- FRAC achieved maximum conversion efficiencies of 22% at 10 Hz and 5.6% at 1 Hz.
- Output pulses of 500 μs duration contained up to 1.6 × 10^9 ions/pulse at 1 Hz with 4.6 nA injected dc beam intensity.
- The device demonstrated effective ion stacking and pulsed beam ejection.
Conclusions:
- The FRAC device offers a viable method for generating high-intensity ion pulses from continuous low-energy beams.
- The RFQ edge effect is crucial for ion deceleration and accumulation in the FRAC system.
- Optimized FRAC operation can significantly enhance dc-to-pulse conversion efficiency for ion beam applications.
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