Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A large area high resolution imaging detector for fast atom diffraction   We describe a high resolution imaging detector based on a single 80 mm
micro-channel-plate (MCP) and a phosphor screen mounted on a UHV flange of only
100 mm inner diameter. It relies on standard components and we describe its
performance with one or two MCPs. A resolution of 80 $\mu m$ rms is observed on
the beam profile. % which is limited by the camera pixel size. At low count
rate, individual impact can be pinpointed with few $\mu m$ accuracy but the
resolution is probably limited by the MCP channel diameter. The detector has
been used to record the diffraction of fast atoms at grazing incidence on
crystal surfaces (GIFAD), a technique probing the electronic density of the
topmost layer only. The detector was also used to record the scattering profile
during azimuthal scan of the crystal to produce triangulation curves revealing
the surface crystallographic directions of molecular layers. It should also be
compatible with reflection high energy electron (RHEED) experiment when fragile
surfaces require a low exposure to the electron beam.

35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex