Dresden 2006 – wissenschaftliches Programm
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VA: Vakuumphysik und Vakuumtechnik
VA 4: Instruments for neutrons
VA 4.1: Vortrag
Montag, 27. März 2006, 14:40–15:00, HSZ 101
Implementation of the Munich Spm at Nepomuc — •Christian Piochacz1, Gottfried Kögel2, Werner Egger2, Peter Sperr2, Werner Triftshäuser2, and Günther Dollinger2 — 1TU München, ZWE FRM-II, Lichtenbergstr. 1, 85747 Garching — 2UniBw München, LRT/2, Werner-Heisenberg-Weg 39, 85577 Neubiberg
The Munich scanning positron microscope (Spm) permits
positron lifetime measurements with a lateral resolution down to
2 µm. A limit in using the SPM was set by the long
measurement times of several days per picture due to the low
intensity positron beam produced by standard 22Na source.
This disadvantage will be overcome by installing the Spm
at the high intensive positron beam facility Nepomuc at
the research reactor FRM-II in Garching. Thus the time for one
measurement will be shorten by a factor 60 and the lateral
resolution will improve to about 100 nm.
Because of the beam characteristic of the Nepomuc source
an interface is needed, which enhances the phase space density of
the beam. The requirements, which have to be fulfilled by the
interface, will be pointed out and an overview of the different
components (bunching units, remoderation stage and rf-elevator)
will be given.