Phase-Space Transformer Prototype
Project status: R&D
Responsible:
Dr. Géza
Zsigmond
In order to achieve high resolution in a neutron experiment, most
of the neutrons in the broad spectrum provided by the neutron source
are wasted during monochromatisation or selection of narrow wavelength
bands. Theoretically it would be possible to directly produce
wavelength-packets of much enhanced intensity even at a medium-power
neutron source. The present project, "Phase Space Transformer for UCN",
is meant to design, construct and test a prototype for such efficient
production of highly monochromatised cold and very cold neutrons (VCN)
by the method of phase space transformation (PST) of ultra-cold
neutrons (UCN). At the planned UCN source at PSI (20
µA average proton current) a performance as that of FOCUS/SINQ
could be reached. The unique capability for PST-UCN is however in the
Very Cold Neutrons (VCN) regime, enabling measurements of S(q,w) in a
range not accessible by existing instruments. The corresponding length
and time scales match those relevant for nanostructures and for very
slow dynamics in surfaces and interfaces.
This project forms part of JRA3
- NO PST: Neutron Optics and Phase Space Transformers project
within the
EU Framework Programme 6 (FP6) NMI3 under contract number
RII3-CT-2003-505925.
Principle of
phase-space transformation
Schematic model of
the test set-up (see PDF)
Presentations:
Numerical studies of the UCN-flux from the spallation ultra-cold
neutron source at PSI and
phase space transformation of ultra-cold neutrons, G. Zsigmond et al.,
ICANS-XVII, Santa Fe, 2005.
Numerical study on phase space transformation of ultra-cold neutrons,
G. Zsigmond et al., CON.T.E.N.T, Grenoble, 2005.
Numerical Study of Optics and Phase Space Transformation of Ultra Cold
Neutrons, G. Zsigmond et al., Very Cold Neutron Source Workshop, IPNS,
2005.
Phase Space Transformation of Ultra Cold Neutrons, G. Zsigmond et al.,
NMI3: Joint Research Activity JRA3, Rutherford Appleton Laboratory,
2005 - PDF.
Publications:
W. Henggeler, M. Boehm, P. Allenspach and A. Furrer, Journal of Neutron
Research, (in print)
M. Boehm, W. Henggeler, P. Allenspach and A. Furrer, Journal of Neutron
Research, (in print)
G. Zsigmond et al., PSI
Scientific Report 2004 / Volume III, NUM, Condensed Matter Research
with Neutrons and Muons, ISSN 1423-7326, p96.
G. Zsigmond et al., Proceedings of the 17th Meeting of the
International Collaboration on Advanced neutron Sources, ICANS-XVII,
2005, Santa Fe (in print) - PDF.
International
Workshop on
Present Status and Future of Very Cold Neutron Applications
13-14 February 2006 at the Paul Scherrer Institute.
SINQ Home Page,
PSI Home Page
Last Modified : 09/03/2006 G. Zsigmond
Principle of
phase-space transformation
Schematic model of
the test set-up (see PDF)