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<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Cambria",serif">Sent on behalf of Changwoo Do and the EXPANSE team<o:p></o:p></span></i></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Dear Colleagues,<br>
<br>
We would like to invite you to join a town hall meeting where we plan to introduce a concept of time-of-flight wide-angle neutron spin echo instrument for the second target station (STS). The STS at the Spallation Neutron Source in Oak Ridge has passed the
CD-1 major milestone entering the conceptual design phase. Eight neutron scattering instruments will be constructed as part of the project. The project office opened a call for instrument proposals, and one proposal currently on the table is one for a wide-angle
spin echo instrument which goes by the name "EXPANSE". <a href="https://urldefense.com/v3/__https:/neutrons.ornl.gov/sts/poc__;!!DZ3fjg!r75CJ7Vp2Em3mse86FsDuoEAQQI8_sdFWg_386lzU72hMOSfzGmXO6l5clYw26kkAQ$" target="_blank">
https://urldefense.com/v3/__https://neutrons.ornl.gov/sts/poc__;!!DZ3fjg!r75CJ7Vp2Em3mse86FsDuoEAQQI8_sdFWg_386lzU72hMOSfzGmXO6l5clYw26kkAQ$</a>
<br>
<br>
We believe that this instrument will become the workhorse instrument for scientific problems that involve high-resolution (neV-µeV) dynamic processes in a wide range of materials. EXPANSE will incorporate wide angle detector banks that can provide approximately
two orders of magnitude Q-range, and a wide wavelength band that can provide approximately four orders of magnitude in Fourier times. EXPANSE will take advantage of the unique beam characteristics of the STS and even enable time-resolved studies in the unparalleled
spatial-temporal range. The range of science areas in which EXPANSE will contribute is diverse and will include soft matter, biological materials, complex fluids, ionic liquids, unconventional magnets, and quantum materials.<br>
<br>
In order to introduce the instrument concept to the broader community and to collect more science ideas for this future instrument, we are organizing an online town hall meeting on Feb 18 (11am-2:30pm EST). We anticipate that this town hall meeting discussions
will be informative for both defining future capability requirements and developing new science programs best suited for the EXPANSE. Please refer to this webpage
<a href="https://urldefense.com/v3/__https:/conference.sns.gov/event/272/__;!!DZ3fjg!r75CJ7Vp2Em3mse86FsDuoEAQQI8_sdFWg_386lzU72hMOSfzGmXO6l5clZe7Pbh3A$" target="_blank">
https://urldefense.com/v3/__https://conference.sns.gov/event/272/__;!!DZ3fjg!r75CJ7Vp2Em3mse86FsDuoEAQQI8_sdFWg_386lzU72hMOSfzGmXO6l5clZe7Pbh3A$</a> for more details and register for the event. Registration is free.<br>
<br>
We look forward to meeting you on Feb 18.<br>
<br>
Thank you very much,<br>
<br>
EXPANSE Team<br>
Yang Zhang, Bradley Olsen, Reika Katsumata, Peter Falus, Maikel C. Rheinstädter Changwoo Do, Georg Ehlers, Wei-Ren Chen, Yangyang Wang, Ken Herwig<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Cambria",serif">Talia Holder<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Cambria",serif">Administrative Assistant
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Cambria",serif">Second Target Station Project Office
<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Cambria",serif">Oak Ridge National Laboratory<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Cambria",serif">Building 8630, Room B238 | PO Box 2008, MS 6453, Oak Ridge, TN 37831-6453<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Cambria",serif">Office: 865-241-7667 | Mobile: 865-680-1955 | Fax: 865-241-5177<o:p></o:p></span></p>
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