Abstract
The brightness of a linac-based intense positron beam was enhanced for total-reflection high-energy positron diffraction (TRHEPD) measurements. The beam initially guided by a magnetic field was released into a non-magnetic region and followed by a transmission-type remoderation. The term “TRHEPD” is a new name of reflection high-energy positron diffraction (RHEPD), which is a technique for the determination of the topmost- and near-surface atomic configurations; the total reflection of the positron beam from a solid surface is a unique superior characteristic. The present system provides the final beam of almost the same quality as the previous one with a 22Na-based positron beam [A. Kawasuso et al., Rev. Sci. Instrum. 75, 4585 (2004)] but much increased flux, i.e., almost the same emittance but much higher brightness. It gave a ∼ 60 times intensified diffraction pattern from a Si(111)–(7 × 7) reconstructed surface compared to the previous result. An improved signal-to-noise ratio in the obtained pattern due to the intensified beam allowed observation of clear fractional-order spots in the higher Laue-zones, which had not been observed previously.
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References
A. Ichimiya, Solid State Phenom. 28-29, 143 (1992)
A. Kawasuso, S. Okada, Phys. Rev. Lett. 81, 2695 (1998)
A. Kawasuso, T. Ishimoto, M. Maekawa, Y. Fukaya, K. Hayashi, A. Ichimiya, Rev. Sci. Instrum. 75, 4585 (2004)
Y. Fukaya, M. Maekawa, I. Mochizuki, K. Wada, T. Hyodo, A. Kawasuso, J. Phys.: Conf. Ser. 443, 012068 (2013)
Y. Fukaya, M. Hashimoto, A. Kawasuso, A. Ichimiya, Surf. Sci. 602, 2448 (2008)
Y. Fukaya, A. Kawasuso, A. Ichimiya, Surf. Sci. 601, 5187 (2007)
K. Wada, T. Hyodo, A. Yagishita, M. Ikeda, S. Ohsawa, T. Shidara, K. Michishio, T. Tachibana, Y. Nagashima, Y. Fukaya, M. Maekawa, A. Kawasuso, Eur. Phys. J. D 66, 37 (2012)
K. Wada, T. Hyodo, T. Kosuge, Y. Saito, M. Ikeda, S. Ohsawa, T. Shidara, K. Michishio, T. Tachibana, H. Terabe, R.H. Suzuki, Y. Nagashima, Y. Fukaya, M. Maekawa, I. Mochizuki, A. Kawasuso, J. Phys.: Conf. Ser. 443, 012082 (2013)
A.P. Mills Jr., R.J. Wilson, Phys. Rev. A 26, 490 (1982)
D.M. Chen, K.G. Lynn, R. Pareja, B. Nielsen, Phys. Rev. B 31, 4123 (1985)
F.M. Jacobsen, M. Charlton, J. Chevallier, B.I. Deutch, G. Laricchia, M.R. Poulsen, J. Appl. Phys. 67, 575 (1990)
N. Oshima, R. Suzuki, T. Ohdaira, A. Kinomura, T. Narumi, A. Uedono, M. Fujinami, J. Appl. Phys. 103, 094916 (2008)
M. Fujinami, S. Jinno, M. Fukuzumi, T. Kawaguchi, K. Oguma, T. Akahane, Anal. Sci. 24, 73 (2008)
A.P. Mills Jr., Appl. Phys. 23, 189 (1980)
H. Wollnik, Optics of Charged Particle (Academic, New York, 1987), p. 151
K.R. Spangenberg, Vacuum Tubes (McGraw-Hill Book Company Inc., 1948), p. 402
G. Comsa, Surf. Sci. 81, 57 (1979)
A. Ichimiya, Reflection High Energy Electron Diffraction (Cambridge University Press, New York, 2004), p. 107
Y. Fukaya, M. Maekawa, A. Kawasuso, I. Mochizuki, K. Wada, T. Shidara, A. Ichimiya, T. Hyodo, Appl. Phys. Express 7, 056601 (2014)
T. Hyodo, Y. Fukaya, M. Maekawa, I. Mochizuki, K. Wada, T. Shidara, A. Ichimiya, A. Kawasuso, J. Phys.: Conf. Ser. 505, 012001 (2014)
Y. Fukaya, I. Mochizuki, M. Maekawa, K. Wada, T. Hyodo, I. Matsuda, A. Kawasuso, Phys. Rev. B 88, 205413 (2013)
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Contribution to the Topical Issue “Electron and Positron Induced Processes”, edited by Michael Brunger, Radu Campeanu, Masamitsu Hoshino, Oddur Ingólfsson, Paulo Limão-Vieira, Nigel Mason, Yasuyuki Nagashima and Hajime Tanuma.
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Maekawa, M., Wada, K., Fukaya, Y. et al. Brightness enhancement of a linac-based intense positron beam for total-reflection high-energy positron diffraction (TRHEPD). Eur. Phys. J. D 68, 165 (2014). https://doi.org/10.1140/epjd/e2014-40802-7
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DOI: https://doi.org/10.1140/epjd/e2014-40802-7