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MOPPH012 |
Beam Slits and Faraday Cup System for the Measurement of Ion Beam Profile in the 18 GHz ECRIS SMASHI | |
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| A beam slits-Faraday cup (slits-cup) system is newly developed to evaluate the performance and the characteristics of the 18 GHz ECR SMASHI (Superconducting Multi-Application Source of Highly-charged Ions), which has been recently commissioned at national fusion research institute in Korea. The slits-cup system consists of a 2-way beam slits and a high power Faraday cup, so that they can collimate the ion beam and also measure the profile of the ion beam. The Faraday cup features a wide range of beam current (0 to 100 mA) and high beam-power capability (300 W). Also, the Faraday cup is designed to have strong features of low signal noise and free of arcing due to electrical wires not exposed to beam line. As for the 2-way beam slits, the slit positions and gaps are independently controllable. Each position of x- and y- slit could be moved by 60 mm, and the slit gap could be adjusted up to 50 mm. Beam profile was measured by adjusting the slit positions from 0 to 50 mm by maintaining the slit gap (e.g., 5 mm). Here, we describe a detailed design of the slit-cup system, beam profile measurements, and their comparisons with the wire scanner measurement. | ||
MOPPH013 |
A New Metal Ion Source Using a Waveguide Directly-Coupled and Permanent Magnet-Embedded Lisitano Antenna | |
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| In order to generate high intensity metal ion beams, a new high density 2.45 GHz electron cyclotron resonance (ECR) ion source was designed. The ion plasma source is generated by a new type of Lisitano antenna, which is directly launched by a waveguide, where permanent magnets are embedded to have continuous toroidal configuration. Since the direct coupling by a waveguide enables the Lisitano antenna to achieve higher power capability (no power limitation), the source is able to generate higher plasma density. Also, the continuous toroidal configuration of the permanent magnets gives additional magnetic confinement to the fast electrons by ECR heating, thereby generating more uniform and higher density plasma. In this presentation, we describe a detailed design of the plasma source, microwave electromagnetic field simulations, and properties of the newly developed direct waveguide coupled Lisitano antenna. | ||
MOPPH014 |
Initial Performance of a Liquid Helium-free Superconducting ECR Ion Source SMASHI at NFRI | |
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A new liquid helium-free superconducting electron cyclotron resonance ion source (ECRIS) has been successfully installed and initially evaluated at the National Fusion Research Institute (NFRI) in Korea. The source features a flexible high magnetic field (>2 T)*, two-frequency heating, plasma diagnostic ports for extraction region, remotely positional three-electrode extraction system (puller-Einzel lens), and capability to generate a wide range of ion elements from gas to metal** . The source, named SMASHI (Superconducting Multi-Application Source of Highly-charged Ions), will be dedicated for development of advanced high-performance ECRIS and future application of highly charged ions in the area of matter interaction. In this presentation, we describe first operations of SMASHI and their initial results. Beam charge state spectra and their maximum intensities are provided for helium and argon beams.
* H. J. You, et al., Rev. Sci. Instrum. 83, 02A326 (2012). ** H. J. You, et al., Rev. Sci. Instrum. 85, 02A916 (2014). |
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