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SANS</title></head><body>
<div><font face="Times New Roman" size="+2" color="#000000">This is an
invitation to all members of the long length scale scattering
community to join in on a discussion at ICNS 2009 of a new small-angle
pulsed neutron scattering instrument at Los Alamos National
Laboratory, Manuel Lujan, Jr. Neutron Scattering Center and to form an
Instrument Advisory Team to develop a letter of intent (LOI) to
realize the instrument. The LOI will lead to a white paper
pre-proposal followed by a full proposal for review by
BES.</font></div>
<div><br></div>
<div><font face="Times New Roman" size="+2">Time and place:<font
color="#000000"> Tuesday, 5 May, 10-12 AM Room
200C</font>.</font></div>
<div><font face="Times New Roman" size="+2">Contacts:<font
color="#000000"> Rex P. Hjelm,</font><font color="#0000FF"><u><i>
hjelm@lanl.gov</i></u></font><font color="#000000"> & Monika A.
Hartl</font>,<font color="#000000"><i>
hartl@lanl.gov</i></font></font></div>
<div><br></div>
<div><font face="Times New Roman" size="+2"
color="#000000"><b>Background</b>:<br>
We propose to build on three decades of experience with the
time-of-flight (TOF) low-<i>Q</i> method and the conclusions of two
recent strategic planning workshops addressing some of the needs for
the low-Q measurement,1-2 to rethink designs for this
class of instrument. The driving factors in considering new
designs include:<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2" color="#000000"><x-tab> </x-tab></font><font
face="Times New Roman" size="+2" color="#000000">Current upgrade plans
at Lujan and the second target station at SNS, both of which promise
substantially improved brightness of cold, pulsed neutron sources at
source frequencies beneficial to the broad bandwidth TOF
technique.<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2" color="#000000"><x-tab>
</x-tab></font><font face="Times New Roman" size="+2"
color="#000000">A need for improved background, optics, data
acquisition rates and instrument flexibility.<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2" color="#000000"><x-tab>
</x-tab></font><font face="Times New Roman" size="+2"
color="#000000">The expressed desire of the user community to provide
for advanced sample environments and to do different types of
measurements simultaneously.<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2"
color="#000000"><x-tab>
</x-tab></font><font face="Times New Roman" size="+2"
color="#000000">Taking full advantage of the wide<i> Q</i>-domain of
the broad bandwidth TOF method.<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2" color="#000000"><x-tab>
</x-tab></font><font face="Times New Roman" size="+2"
color="#000000">Taking advantage of the unique opportunities afforded
by the time structure of the pulsed neutron source in pulse-probe
measurements.<br>
</font><font face="Symbol" size="+2" color="#000000">o</font><font
face="Arial" size="+2" color="#000000"><x-tab>
</x-tab></font><font face="Times New Roman" size="+2"
color="#000000">The development of polarization and spin-echo
techniques to encode ultra low-<i>Q</i>, do low-energy spectroscopy
within the domain of the low-<i>Q</i> technique and quantifying
nuclear spin incoherence. <br>
<b>Agenda:<br>
</b>There will be short presentations touching on each of the above
topics, followed by an open discussion on the current and future needs
of the user community and how to best achieve them. We will also
solicit volunteers and nominations for the members of an Instrument
Advisory Committee and set up an action plan to draft a LOI to BES to
develop a new SANS at Lujan.<br>
<br>
1"Workshop Report on Enhanced National Capability in Neutron
Scattering," September 5-7, 2007, San Diego, CA.<br>
2"Workshop Report on the Lujan Center in the SNS Era," September
18-19, 2006, Santa Fe, NM.</font><br>
<font face="Times New Roman" size="+2" color="#000000"></font></div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div>Rex P. Hjelm, Ph.D.<br>
Manuel Lujan, Jr. Neutron Scattering Center<br>
Los Alamos Neutron Science Center<br>
H805<br>
Los Alamos National Laboratory<br>
Los Alamos, NM 87545<br>
505-665-2372<br>
FAX: 505-665-2676<br>
Hjelm@lanl.gov</div>
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