Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 45: Instrumentation and Applications VI
HK 45.2: Vortrag
Donnerstag, 11. März 2004, 17:00–17:15, C
Nuclear Polarization Measurement of H/D atoms extracted from a Storage cell with a Lamb-shift Polarimeter — •Ralf Engels1, Reinhard Emmerich2, Kyrill Grigoriev3, Jürgen Ley2, Maxim Mikirtytchiants3, Frank Rathmann1, Hans Paetz gen. Schieck2, Hellmut Seyfarth1, and Alexandre Vassiliev3 — 1Institut für Kernphysik, Forschungszentrum Jülich — 2Institut für Kernphysik, Universität zu Köln — 3St. Petersburg Nuclear Physics Institute
The occupation numbers of the individual hyperfine substates in a
beam of hydrogen or deuterium atoms are measured with a Lamb-shift
polarimeter (LSP). Therefore, the nuclear polarization of an atomic
beam can be determined with high precision of ∼ 1% within 20 s.
The measurements are carried out with the atomic beam source for
the polarized target at ANKE (I ∼ 7 · 1016 atoms/s).
The polarization of a slow (500 - 2000 eV) ion beam with currents
higher than 2 nA can be measured as well. If the intensity of the
atomic beam is reduced by a factor of 100, the statistical error
increases, but the Lamb-shift polarimeter still provides a
precise measurement. Therefore,
it seems possible with some new improvements of the LSP to use
only a small fraction of atoms effused from a polarized
storage cell gas
target to determine the polarization of the atoms inside the cell.
First results obtained by a simple teflon cell, a new ionizer
with an internal getter pump, a new designed wienfilter and a new
photomultiplier are presented. Planned studies to optimize the
polarization measurement are discussed as well.
Supported by FZ Jülich and BMBF.