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<p>Dear friends of neutron research,<br>
<br>
you are cordially invited to the the KFN neutron webinar lecture
by<br>
</p>
<h2>Dr. Martin Boehm (ILL) on</h2>
<h2>"Flux and Flexibility: Triple-Axis Spectroscopy for Quantum
Materials Research"</h2>
<h2>Friday, 27 March 2026, 11:00 - 12:00 CET</h2>
<p> </p>
<p class="MsoNormal">Zoom link: <a class="moz-txt-link-freetext"
href="https://fz-juelich-de.zoom-x.de/j/68605264978?pwd=Z1ROzU0nTd9eaZhNjzHeverxQYuSaK.1">https://fz-juelich-de.zoom-x.de/j/68605264978?pwd=Z1ROzU0nTd9eaZhNjzHeverxQYuSaK.1</a><br>
Meeting ID: 686 0526 4978<br>
Passcode: 620383</p>
<p> </p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-ansi-language:EN-GB;mso-no-proof:
yes"><img width="121" height="171"
src="cid:part1.VfkgurHj.Qn0ynBxe@sni-portal.de" class=""></span><span
lang="EN-GB" style="mso-ansi-language:
EN-GB"></span></p>
<p> </p>
<p class="MsoNormal"><span lang="EN-US"
style="mso-ansi-language:EN-US">Since its invention by Bertram
Brockhouse in the 1950s, the triple-axis spectrometer (TAS)
has been one of the central instruments of inelastic neutron
scattering, enabling the first direct measurements of phonon
and magnon dispersion relations and became a key tool in
establishing the experimental basis of quantum
condensed-matter physics [1,2]. In parallel with the
development of wide-range mapping capabilities of modern
time-of-flight (TOF) spectrometers, TAS have evolved to
deliver precision and flexibility in focused regions of the
momentum-energy phase space. In this talk, we provide a short
overview of its present-day capabilities and its
complementarity with modern (direct and indirect) TOF
instruments.</span></p>
<p class="MsoNormal"><span lang="EN-US"
style="mso-ansi-language:EN-US">One of the scientific
strengths of TAS today lies particularly in parametric studies
under extreme conditions such as high pressure and strong
magnetic fields at millikelvin temperatures, where
reciprocal-space access may be limited but fine control and
background suppression are essential. We try to highlight
representative examples from quantum magnetism and correlated
quantum materials. In this context, TAS offers also
distinctive capabilities through polarization analysis,
providing direct access to the neutron spin state and enabling
detailed insight into magnetic structures and spin dynamics.</span></p>
<p class="MsoNormal"><span lang="EN-US"
style="mso-ansi-language:EN-US">Looking ahead, we discuss
current instrumentation trends that extend TAS concepts toward
multiplexed analyzer–detector systems, such as CAMEA at
the Paul Scherrer Institute [3] and the future MARMOT at
the Institut Laue–Langevin. These developments promise
significant gains in efficiency while preserving the intrinsic
strengths of TAS. Finally, we outline how modern data-analysis
algorithms and semi-autonomous measurement strategies might
further enhance performance, enabling efficient experiment
planning [4,5]. Together, these advances position triple-axis
spectroscopy as a continually evolving tool that remains
indispensable within the broader neutron spectroscopy
landscape.</span></p>
<p class="MsoNormal"><span lang="EN-US"
style="mso-ansi-language:EN-US">[1] B.N. Brockhouse – Nobel
Lecture. NobelPrize.org. Nobel Prize Outreach 2026. </span><a
href="https://www.nobelprize.org/prizes/physics/1994/brockhouse/lecture/"><span
lang="EN-US" style="mso-ansi-language:EN-US">https://www.nobelprize.org/prizes/physics/1994/brockhouse/lecture/</span></a><span
lang="EN-US" style="mso-ansi-language:EN-US"><br>
[2] see e.g. G. Shirane, S.M. Shapiro, J. Tranquade, <i
style="mso-bidi-font-style:
normal">Neutron Scattering with a Triple-Axis Spectrometer</i>,
Cambridge University Pressm 2009, ISBN 9780511534881. </span><a
href="https://doi.org/10.1017/CBO9780511534881"><span
lang="EN-US" style="mso-ansi-language:EN-US">https://doi.org/10.1017/CBO9780511534881</span></a><span
lang="EN-US" style="mso-ansi-language:EN-US"><br>
[3] J. Lass et al.,<i> Rev. Sci. </i></span><i>Instrum.</i> <b
style="mso-bidi-font-weight:normal"><span lang="EN-GB"
style="mso-ansi-language:
EN-GB">1</span></b><span lang="EN-GB" style="mso-ansi-language:EN-GB">
February 2023; 94 (2): 023302. </span><a
href="https://doi.org/10.1063/5.0128226" target="_blank"><span
lang="EN-GB" style="mso-ansi-language:EN-GB">https://doi.org/10.1063/5.0128226</span></a><span
lang="EN-GB" style="mso-ansi-language:EN-GB"><br>
</span><span lang="EN-US" style="mso-ansi-language:EN-US">[4]
M.M. Noack et al., Nature Reviews Physics <b
style="mso-bidi-font-weight:normal">3</b>, 685-697 (2021).<br>
</span><span lang="FR" style="mso-ansi-language:FR">[5] M.
Teixeira Parente et al., <span
style="mso-bidi-font-style:italic">Nat Commun</span> <b>14</b>,
2246 (2023). </span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-ansi-language:EN-GB"><br>
The lecture will be recorded, and there is information on data
protection at<br>
</span><a
href="https://www.sni-portal.de/en/files/kfn-neutron-webinar-data-protection"
target="_blank"><span lang="EN-GB"
style="mso-ansi-language:EN-GB">https://www.sni-portal.de/en/files/kfn-neutron-webinar-data-protection</span></a><span
lang="EN-GB" style="mso-ansi-language:EN-GB"><br>
<br>
On the website<br>
</span><a
href="https://www.sni-portal.de/en/user-committees/committee-research-with-neutrons/neutron-webinar"
target="_blank"><span lang="EN-GB"
style="mso-ansi-language:EN-GB">https://www.sni-portal.de/en/user-committees/committee-research-with-neutrons/neutron-webinar</span></a><span
style="mso-ansi-language:EN-GB"> <span lang="EN-GB">you will
find announcements of upcoming lectures.</span></span></p>
<p>We look forward to "seeing" you there!<br>
<br>
Kind regards,<br>
<br>
Karin Griewatsch (KFN PR)<br>
Mirijam Zobel (KFN chair)<br>
Frank Schreiber and Thomas Gutberlet (Webinar organization)</p>
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