Heo, Seongjin
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Boussaid, Ramzi
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Shin, Taeksu
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Park, Young-Ho
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Son, Hyock-Jun
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Moon, Jun-Young
(Rare Isotope Science Project, Institute for Basic Science 1 , Daejeon 34000, South Korea)
,
Kim, Eun-San
(Department of Accelerator Science, Korea University 2 , Sejong 30019, South Korea)
,
Bahng, Jungbae
(Department of Accelerator Science, Korea University 2 , Sejong 30019, South Korea)
Radioactive ion beams produced using the isotope separation on-line method in the Rare isotope Accelerator complex for ON-line (RAON) experiment are to be delivered with a beam emittance of around 3 π mm mrad, an energy spread of less than 10 eV, and a short beam bunch width of around 10 µs...
Radioactive ion beams produced using the isotope separation on-line method in the Rare isotope Accelerator complex for ON-line (RAON) experiment are to be delivered with a beam emittance of around 3 π mm mrad, an energy spread of less than 10 eV, and a short beam bunch width of around 10 µs to meet the requirements of an electron beam ion source charge breeder. A radio frequency quadrupole cooler buncher (RFQ-CB) will be used to meet the beam quality requirements mentioned above. Our target bunching capacity of RFQ-CB is 108 ions/bunch for various ion species. Such a high bunching capacity requires an RF amplitude of ∼3 kV and a frequency range of 1.5-4.5 MHz in our RFQ-CB design. We designed and tested the prototype RF system composed of a helical resonator, a high-power RF amplifier, and high-voltage probes. To reduce heat load to the high voltage probes, we employed vacuum capacitors serially connected to the ends of helical resonators. In the experiment, we confirmed that our 4.5-µH helical resonators made of a 12-mm copper tube and variable vacuum capacitor with a capacitance range of 120-1120 pF can produce required voltages and frequencies using a 100-W RF amplifier. As a result, with 2.5-W RF output power, we obtained the maximum voltage amplitude of 1 kV at 4.5 MHz, which is equivalent to 6.4 kV with 100-W RF output power.
Radioactive ion beams produced using the isotope separation on-line method in the Rare isotope Accelerator complex for ON-line (RAON) experiment are to be delivered with a beam emittance of around 3 π mm mrad, an energy spread of less than 10 eV, and a short beam bunch width of around 10 µs to meet the requirements of an electron beam ion source charge breeder. A radio frequency quadrupole cooler buncher (RFQ-CB) will be used to meet the beam quality requirements mentioned above. Our target bunching capacity of RFQ-CB is 108 ions/bunch for various ion species. Such a high bunching capacity requires an RF amplitude of ∼3 kV and a frequency range of 1.5-4.5 MHz in our RFQ-CB design. We designed and tested the prototype RF system composed of a helical resonator, a high-power RF amplifier, and high-voltage probes. To reduce heat load to the high voltage probes, we employed vacuum capacitors serially connected to the ends of helical resonators. In the experiment, we confirmed that our 4.5-µH helical resonators made of a 12-mm copper tube and variable vacuum capacitor with a capacitance range of 120-1120 pF can produce required voltages and frequencies using a 100-W RF amplifier. As a result, with 2.5-W RF output power, we obtained the maximum voltage amplitude of 1 kV at 4.5 MHz, which is equivalent to 6.4 kV with 100-W RF output power.
참고문헌 (6)
Nucl. Instrum. Methods Phys. Res., Sect. B 408 334 2017 10.1016/j.nimb.2017.03.131 Development of an EBIS charge breeder for the rare isotope science project
R. Boussaïd, “Etude et développement d’un refroidisseur radiofréquence à gaz tampon pour des faisceaux radioactifs de très hautes intensités (study and development of a radiofrequency cooler with buffer gas for a very high intensity radioactive beams),” Ph.D. thesis, Université de Caen, 2012.
Nucl. Instrum. Methods Phys. Res., Sect. A 676 32 2012 10.1016/j.nima.2012.02.004 TITAN’s digital RFQ ion beam cooler and buncher, operation and performance
I. Podadera Aliseda, “New developments on preparation of cooled and bunched radioactive ion beams at ISOL facilities: The ISCOOL project and the rotating wall cooling,” Ph.D. thesis, Université Polytechnique de Catalunya, 2006.
MOPG33 2017 Design of RISP RFQ cooler buncher
Appl. Phys. B 107 921 2012 10.1007/s00340-011-4837-0 On the application of radio frequency voltages to ion traps via helical resonators
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