Focusing of charged particle beams with various glass-made optics

• Published in: Journal of physics. Conference series 2007-11, Vol.88 (1), p.012031
• Main Authors: Ikeda, T, Kanai, Y, Kojima, T M, Iwai, Y, Kanazawa, Y, Hoshino, M, Kobayashi, T, Pokhil, G P, Yamazaki, Y
• Format: Article
• Language: English
• Subjects: Charged particles; Density; Focusing; Glass plates; Ion beams; Ions; Muons; Particle beams; Physics; Tubes
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/88/1/012031

We have developed methods to focus slow highly charged ions, MeV ions, and muon beams with various glass-made beam optics. (1) A focusing effect for an Ar8 + beam of 8 keV through a cm-long tapered capillary was obtained with a density enhancement of the transmitted beam compared with that of the input beam, which increases from 1 to 6 as the input current decreases from 30 pA to 0.8 pA. To study the stability of the transmitted beams through a glass capillary, we have measured the transmission of an 104 keV Ar8+ beam through a gap between a pair of parallel glass plates, and observed a precisely vibrational output current. (2) For 4 MeV He2+ beam, a 100 times density enhanced beam by a cm-long tapered capillary with a closed outlet was utilized to irradiate a cell in liquid. The range of the beam was controlled by the closed outlet with accuracy of ~1 μm. (3) Using 40 cm-long tapered glass tubes, a density enhancement of a factor of ≃2 was observed for both positive and negative muon beams with an energy of 13 MeV.