High precision polarimeter system for atomic polarization and tilted-foil experiments with 1.7 keV/amu 14N+ beam

Shimizu, S.; Doumoto, E.; Tanimoto, S.; Nakamura, M.; Hirayama, Y.; Horie, K.; Shigematsu, T.; Izumi, H.; Shimoda, T.; Takahashi, N.

doi:info:doi/10.1063/1.1150576

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タイトル	High precision polarimeter system for atomic polarization and tilted-foil experiments with 1.7 keV/amu 14N+ beam
著者	Shimizu, S. Shimizu, S.
	Doumoto, E. Doumoto, E.
	Tanimoto, S. Tanimoto, S.
	Nakamura, M. Nakamura, M.
	Hirayama, Y. Hirayama, Y.
	Horie, K. Horie, K.
	Shigematsu, T. Shigematsu, T.
	Izumi, H. Izumi, H.
	Shimoda, T. Shimoda, T.
	Takahashi, N. Takahashi, N.
抄録	A high precision atomic polarimeter system for the use in beam-foil spectroscopy experiments with a few keV/amu heavy-ion beams has been developed. The polarimeter measures the circular polarization of fluorescences from the beam ion in-flight after the beam-foil interaction. The present system has two identical such polarimeters in both sides of the beam axis to reduce the systematic errors such due to the fluctuations of beam current, background and so on. A successful use of an ultrathin carbon foil (1.5 μg/cm^2), which was durable for several hours against a few hundred nA beam irradiation, enabled the beam-foil experiments with such low energy heavy-ion beams. A performance test of the polarimeter system was carried out in the tilted foil experiments with a 1.7 keV/amu ^<14>N + beam. The atomic polarization was observed for the transition 1s^22s^22p3p ^1D → 1s^22s^22p3p ^1P, whose fluorescence wavelength is 399.5 nm, in the N+ ion (N II). The polarization was approximately -2% for the tilt angle of -40° and showed monotone increasing with increasing tilt angle up to + 2% for + 40°. The polarization at 0° was (0.002±0.25)%, which is highly consistent with the expected polarization of 0%. This result indicates the high reliability of the present polarimeter system. This is the first tilted-foil experiment at such low beam energy. The present experimental technique will be very useful for studies of the polarization mechanism of the beam-foil interaction.
公開者	American Institute of Physics
掲載誌名	Review of Scientific Instruments
巻	71
号	5
開始ページ	2045
終了ページ	2049
刊行年月	2000-05
ISSN	00346748
NCID	AA00817730
DOI	info:doi/10.1063/1.1150576
URL	http://hdl.handle.net/11094/23132
関連情報 (references)	http://rsi.aip.org/resource/1/rsinak/v71/i5/p2045_s1
権利情報	Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of Scientific Instruments, 71(5), 2045-2049, 2000 and may be found at http://dx.doi.org/10.1063/1.1150576
言語	英語
カテゴリ	学術雑誌論文 Journal Article

著者版フラグ	publisher
NII資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Review of Scientific Instruments.71(5) P.2045-P.2049
DC.title	High precision polarimeter system for atomic polarization and tilted-foil experiments with 1.7 keV/amu 14N+ beam
DC.creator	Shimizu, S.
	Doumoto, E.
	Tanimoto, S.
	Nakamura, M.
	Hirayama, Y.
	Horie, K.
	Shigematsu, T.
	Izumi, H.
	Shimoda, T.
	Takahashi, N.
DC.publisher	American Institute of Physics
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2000-05
DC.identifier	info:doi/10.1063/1.1150576
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/23132
DCTERMS.abstract	A high precision atomic polarimeter system for the use in beam-foil spectroscopy experiments with a few keV/amu heavy-ion beams has been developed. The polarimeter measures the circular polarization of fluorescences from the beam ion in-flight after the beam-foil interaction. The present system has two identical such polarimeters in both sides of the beam axis to reduce the systematic errors such due to the fluctuations of beam current, background and so on. A successful use of an ultrathin carbon foil (1.5 μg/cm^2), which was durable for several hours against a few hundred nA beam irradiation, enabled the beam-foil experiments with such low energy heavy-ion beams. A performance test of the polarimeter system was carried out in the tilted foil experiments with a 1.7 keV/amu ^<14>N + beam. The atomic polarization was observed for the transition 1s^22s^22p3p ^1D → 1s^22s^22p3p ^1P, whose fluorescence wavelength is 399.5 nm, in the N+ ion (N II). The polarization was approximately -2% for the tilt angle of -40° and showed monotone increasing with increasing tilt angle up to + 2% for + 40°. The polarization at 0° was (0.002±0.25)%, which is highly consistent with the expected polarization of 0%. This result indicates the high reliability of the present polarimeter system. This is the first tilted-foil experiment at such low beam energy. The present experimental technique will be very useful for studies of the polarization mechanism of the beam-foil interaction.
DC.rights	Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of Scientific Instruments, 71(5), 2045-2049, 2000 and may be found at http://dx.doi.org/10.1063/1.1150576
citation_title	High precision polarimeter system for atomic polarization and tilted-foil experiments with 1.7 keV/amu 14N+ beam
citation_author	Shimizu, S.
	Doumoto, E.
	Tanimoto, S.
	Nakamura, M.
	Hirayama, Y.
	Horie, K.
	Shigematsu, T.
	Izumi, H.
	Shimoda, T.
	Takahashi, N.
citation_publisher	American Institute of Physics
citation_language	英語
citation_date	2000-05
citation_journal_title	Review of Scientific Instruments
citation_volume	71
citation_issue	5
citation_firstpage	2045
citation_lastpage	2049
citation_issn	00346748
citation_doi	info:doi/10.1063/1.1150576
citation_public_url	http://hdl.handle.net/11094/23132

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