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Precision Lamb-shift polarimeter for polarized atomic and ion beams
Ist Teil von
Review of scientific instruments, 2003-11, Vol.74 (11), p.4607-4615
Erscheinungsjahr
2003
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The Lamb-shift polarimeter described here enables the polarization of a beam of hydrogen (deuterium) atoms, or of a slow proton (deuteron) beam, to be measured with an absolute precision better than 1% within a few seconds. The polarimeter measures the intensity ratios of Lyman-α transitions after Stark quenching of metastable hyperfine substates that were selected in a spin filter. For that purpose the hydrogen (deuterium) atoms are ionized in a Glavish-type ionizer. By charge exchange of the protons (deuterons) in cesium vapor, atoms in the metastable
2S
state are produced. For a hydrogen beam of
3×10
16
atoms/s
,
∼3×10
6
photons/s
are registered in a photomultiplier, i.e., the polarimeter efficiency is about
10
−10
.
The signal-to-background ratio in the Lyman-α spectrum is excellent, thus beam intensities of one to two orders of magnitude less would still be sufficient to carry out a precise measurement. The different components of the polarimeter affect the measured polarization in several ways. It was, therefore, crucial to determine precisely the associated correction factors in order to derive the nuclear polarization from the measured Lyman-α spectra.
Sprache
Englisch
Identifikatoren
ISSN: 0034-6748
eISSN: 1089-7623
DOI: 10.1063/1.1619550
Titel-ID: cdi_crossref_primary_10_1063_1_1619550
Format
–
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