[Neutron] ICNS workshop announcement on TOF SANS

[Rex Hjelm]

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.

Time and place: Tuesday, 5 May, 10-12 AM Room 200C.
Contacts: Rex P. Hjelm, hjelm at lanl.gov & Monika A. Hartl, hartl at lanl.gov

Background:
We propose to build on three decades of experience with the 
time-of-flight (TOF) low-Q 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:
o	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.
o	A need for improved background, optics, data acquisition 
rates and instrument flexibility.
o	The expressed desire of the user community to provide for 
advanced sample environments and to do different types of 
measurements simultaneously.
o	Taking full advantage of the wide Q-domain of the broad 
bandwidth TOF method.
o	Taking advantage of the unique opportunities afforded by the 
time structure of the pulsed neutron source in pulse-probe 
measurements.
o	The development of polarization and spin-echo techniques to 
encode ultra low-Q, do low-energy spectroscopy within the domain of 
the low-Q technique and quantifying nuclear spin incoherence. 
Agenda:
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.

1"Workshop Report on Enhanced National Capability in Neutron 
Scattering," September 5-7, 2007, San Diego, CA.
2"Workshop Report on the Lujan Center in the SNS Era," September 
18-19, 2006, Santa Fe, NM.

-- 
Rex P. Hjelm, Ph.D.
Manuel Lujan, Jr. Neutron Scattering Center
Los Alamos Neutron Science Center
H805
Los Alamos National Laboratory
Los Alamos, NM 87545
505-665-2372
FAX: 505-665-2676
Hjelm at lanl.gov
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