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| Publications [#249381] of Ying Wu
Papers Published
- Schmid, P; Feng, J; Padmore, H; Robin, D; Rose, H; Schlueter, R; Wan, W; Forest, E; Wu, Y, Correction and alignment strategies for the beam separator of the photoemission electron microscope 3 (PEEM3),
Rev. Sci. Instrum., vol. 76 no. 2
(February, 2005),
pp. 023302-023302, AIP Publishing, ISSN 0034-6748 (023302.) [doi]
(last updated on 2026/01/13)
Abstract:
A high-resolution aberration-corrected
photoemission electron microscope (PEEM3)
will be installed on an undulator beamline at
the Advanced Light Source at the Lawrence
Berkeley National Laboratory. The aim of this
instrument is to provide a substantial flux
and resolution improvement by employing an
electron mirror for correcting both the
third-order spherical aberration and the
primary chromatic aberration. In order to
utilize this concept of correction, a beam
separator is a prerequisite. Crucial to
achieving a resolution of 5 nm for the
high-resolution mode, and a 16-fold increase
in throughput at the same resolution as its
predecessor, PEEM2, specified as 20 nm at 2%
transmission, for the high flux mode is the
double-symmetric design of the beam
separator, which eliminates all the
second-order geometric aberrations.
Nonetheless, substantial tuning capabilities
must be incorporated into the PEEM3 design to
compensate for both systematic and random
errors. In this article, we investigate how
to correct for nonsystematic imperfections
and for systematic uncertainties in the
accuracy of the magnetic fields and focus on
how degradation of the resolution and the
field of view can be minimized. Finally, we
outline a tentative correction strategy for
PEEM3. © 2005 American Institute of Physics.
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