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Bernhard Lauss (PSI - Paul Scherrer Institut)31/08/2026, 09:00Oral Presentation
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Dieter Achim Ries (PSI - Paul Scherrer Institut)31/08/2026, 09:10Oral Presentation
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Anastasio Fratangelo31/08/2026, 09:25Oral Presentation
The Electric Dipole Moment (EDM) of the neutron has attracted interest as a promising channel for finding New Physics for a long time. The existence of the neutron EDM would violate CP symmetry given CPT conservation. As a new source of CP violation, the neutron EDM would help answering one of the open questions in fundamental physics: the mystery of the baryon asymmetry in the Universe. The...
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Dr Takashi Higuchi (Kyoto U. / U. Osaka)31/08/2026, 10:05Oral Presentation
The TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration has been developing a neutron electric dipole moment (EDM) spectrometer supplied by its high-intensity ultracold neutron (UCN) source. Our room-temperature Ramsey EDM spectrometer features a multilayer magnetically shielded room (MSR), a self-shielded $B_0$ coil, and other subsystems designed to satisfy the requirements for an EDM...
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Kseniia Svirina (Institut Laue-Langevin)31/08/2026, 11:10Oral Presentation
SuperSUN is a high-density source of Ultra Cold Neutrons (UCN) that feeds the PanEDM experiment, aiming to measure the neutron's permanent Electric Dipole Moment (EDM). The source delivers an exceptionally low-energy UCN spectrum, which promises long observation times but also requires developing new UCN handling techniques.
SuperSUN is based on conversion of cold neutrons in superfluid...
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Jake Johnson (PSI)31/08/2026, 11:50Oral Presentation
The n2edm experiment, hosted at the PSI ultracold neutron (UCN) source, aims to measure the permanent neutron electric dipole moment, $d_n$, with a precision of at least $10^{-27}$ $e$ cm to probe charge conjugation and parity (CP) violation in beyond standard model physics [1]. It has evolved from the previous nedm experiment that took data at PSI from 2015 to 2017, resulting in the current...
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Peter Matthias Stoffer (PSI - Paul Scherrer Institut)31/08/2026, 14:30Oral Presentation
A dynamical explanation of the baryon asymmetry of the universe requires new sources of CP violation. Under the assumption that these are tied to heavy particles beyond the Standard Model, an effective field theory framework can be used to describe their effect on low-energy precision observables, such as electric dipole moments. I will review the challenges and recent progress to establish...
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Kent Leung (Montclair State University)31/08/2026, 15:10Oral Presentation
The path to an “ultimate” nEDM apparatus is small measurement cells for suppressing systematic effects to a manageable level while achieving a sufficiently high ultracold neutron (UCN) density to improve statistical reach. The nEDM Superfluid technique offers this by exploiting a fortuitous combination of the properties of superfluid $^4$He, polarized $^3$He, and polarized UCN, allowing high...
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Lea Segner31/08/2026, 16:20Oral Presentation
The dominant systematic in the n2EDM experiment is the false EDM effect. Magnetic field inhomogeneities in the presence of an electric field generate an electric-field correlated shift in the measured frequencies, effectively mimicking a "false" electric dipole. To correct for this effect, a dedicated array of optically pumped Cesium vapor magnetometers is used to perform online measurements...
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Wolfgang Klassen (University of British Columbia)31/08/2026, 16:45Oral Presentation
The TUCAN collaboration aims to provide a world-class measurement of the neutron EDM, with an eventual precision goal of $1\times10^{-27}\ e\cdot$cm. In order to achieve this target sensitivity the magnetic environment in the experimental region must be very carefully controlled and monitored. To this end TUCAN has developed a suite of Cs based optically pumped magnetometers with the primary...
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Sean Vanbergen31/08/2026, 17:10Oral Presentation
The TRIUMF Ultracold Advanced Neutron (TUCAN) source produced UCNs for the first time in 2025. As part of the characterization of this new UCN source, we installed a prototype storage cell for the TUCAN EDM experiment with a guide geometry similar to that expected in a real experiment. We measured the filling, storage, and emptying of UCNs with this cell, optimizing the timing sequence to...
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Christopher Crawford (University of Kentucky)31/08/2026, 17:35Oral Presentation
Interpolation is necessary for simulating dynamics in measured magnetic field maps and can increase efficiency and/or accuracy with computed fields, example, finite element calculations. Harmonic expansion has the benefit of constraining the curl and divergence, but work best in a compact volume far from sources. An adaptation of this expansion is better suited for irregular volumes while...
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Ruediger Picker (TRIUMF)01/09/2026, 09:00Oral Presentation
Ultracold neutrons (UCN) can help solve some of the universe's fundamental puzzles: very high precision experiments are possible due to observation times lasting up to hundreds of seconds.
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However, experiments, such as searches for the neutron electric dipole moment, measurements of the neutron lifetime, and tests of neutron-gravity-interaction tests have been statistics limited.
Our TRIUMF... -
Shinsuke Kawasaki (KEK)01/09/2026, 09:25Oral Presentation
The TUCAN collaboration aims to search for the neutron electric dipole moment (nEDM) with an unprecedented precision of $10^{-27}$cm. To achieve this sensitivity, the development of the world's highest-intensity ultra-cold neutron (UCN) source is essential. A critical component of this source is the advanced cryogenic system, designed to maintain superfluid helium at optimal temperatures under...
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Ryuto Fujitani (Kyoto University)01/09/2026, 09:50Oral Presentation
The TRIUMF UltraCold Advanced Neutron (TUCAN) project has constructed a high-intensity ultracold-neutron source at TRIUMF for a neutron electric dipole moment experiment. The UCN production utilizes the superthermal method in which inelastic scattering in superfluid helium converts cold neutrons into ultracold neutrons. One of the factors critical for the performance of the UCN source is the...
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Dieter Achim Ries (PSI - Paul Scherrer Institut)01/09/2026, 10:15Oral Presentation
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Gian Caratsch (ETH Zürich)01/09/2026, 11:10Oral Presentation
The n2EDM experiment at the Paul Scherrer Institut aims to improve the sensitivity of the measurement of the neutron electric dipole moment (nEDM) by a factor of ten relative to the previous phase of the project. The statistical uncertainty on the extracted nEDM decreases with increasing neutron polarization. Our goal was to conserve the high neutron polarization after the 5 T polarizer magnet...
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Dr Ahmed Salman (High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan)01/09/2026, 11:35Oral Presentation
To achieve the target neutron electric dipole moment sensitivity of $d_n \sim 10^{-27}$ e.cm for the TUCAN EDM experiment, efficient polarization transport of ultracold neutrons is required. Therefore, magnetic spin transport guiding coils are designed to adiabatically transport and manipulate polarized neutrons from the superconducting neutron polarizer to the precession chamber and back out...
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Xiaozhe Zhu (Graduate Student)01/09/2026, 12:00Oral Presentation
The proposed cryogenic neutron electric dipole moment experiment at the Spallation Neutron Source (nEDM@SNS) requires that polarized cold neutrons be transported through a highly nonuniform magnetic field while maintaining high polarization. In this talk, we will present recent progress in magnetic field control and polarization transport studies for the nEDM@SNS experiment, along with...
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Georg Bison (PSI - Paul Scherrer Institut)01/09/2026, 14:30Oral Presentation
Shielding, creating and measuring magnetic fields for n2EDM
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Guillermo Velez (Arizona State University)01/09/2026, 15:10Oral Presentation
A robotic 3D mapper has been developed to characterize the magnetic field in the shielded environment of the nEDM experiment at Los Alamos National Lab. The mapper allows for movement within a cylindrical volume and probes the magnetic field with a fluxgate magnetometer. Analysis of mapper data will be used to determine the effectiveness of both magnetic shielding methods and holding field...
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Valentin Czamler (PSI)01/09/2026, 15:35Oral Presentation
The n2EDM experiment at the Paul Scherrer Institute (PSI) aims to reach a neutron electric-dipole-moment (nEDM) sensitivity of $1\times10^{-27}~e\cdot\mathrm{cm}$. At this sensitivity, magnetic-field nonuniformities must be tightly controlled. In particular, odd-order harmonic modes contribute to a motional false EDM through the $^{199}\mathrm{Hg}$ co-magnetometer. These modes must be...
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Tahereh Mohammadi (University of Manitoba)01/09/2026, 16:30Oral Presentation
The neutron electric dipole moment (nEDM) is sensitive probe of physics beyond the Standard Model of Particle Physics. The TUCAN collaboration targets a 1$\sigma$ uncertainty of $10^{-27}$ e·cm. Reaching this level of precision requires a well-controlled magnetic environment, in particular a stable and spatially uniform magnetic holding field $B_0$ for UCN spin precession. A self-shielded...
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Luca Kaess01/09/2026, 16:55Oral Presentation
The PanEDM experiment aims to measure the neutron electric dipole moment using ultracold neutrons (UCN) produced by the superthermal UCN source SuperSUN at the Institut Laue-Langevin (ILL) and stored in double precession chambers, with a sensitivity of $4\cdot10^{-27}\,e\cdot$cm anticipated after 100 days of measurement time.
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The interface between SuperSUN and PanEDM is responsible for... -
abeer zahra (University of Manitoba)01/09/2026, 17:20Oral Presentation
The TRIUMF UltraCold Advanced Neutron collaboration recently demonstrated world-leading UCN densities delivered to an external experimental volume using a spallation-driven source. This marks a major milestone toward reaching a statistical sensitivity of 10⁻²⁷ e·cm in the future TUCAN EDM experiment.
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Realizing this goal requires transporting the ultracold neutrons (UCNs) from the source to... -
Nikolaus Stephan Edler von Schickh (PSI - Paul Scherrer Institut)02/09/2026, 09:00Oral Presentation
Achieving the n2EDM baseline sensitivity of 1×10⁻²⁷ e·cm at the Paul Scherrer Institut demands precise monitoring of the magnetic field experienced by the neutrons. This is achieved using optically pumped ¹⁹⁹Hg co-magnetometers, which operate in the same storage volumes as the neutrons. Their role is crucial, as they guard against a class of systematic shifts that cannot be mitigated...
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Eric Miller (University of British Columbia)02/09/2026, 09:25Oral Presentation
The TRIUMF UltraCold Advanced Neutron collaboration recently demonstrated the world’s highest UCN density using a spallation-driven source. This milestone enables an nEDM experiment with a sensitivity goal of 10$^{−27}$ e·cm. Hg vapour co-magnetometry provides essential correction of magnetic field drifts at the picotesla level during each Ramsey resonance cycle, while also introducing...
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Antonella Saracino02/09/2026, 09:50Oral Presentation
Measurements of the neutron electric dipole moment (nEDM) provide a sensitive probe
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of CP-violating beyond the Standard Model physics. The Los Alamos National
Laboratory (LANL) nEDM experiment is a double-cell ultracold neutron (UCN)
experiment that aims to achieve a statistical sensitivity of 2 x 10-27 e cm, an order-of-
magnitude smaller than the current experimental limit. To control... -
Alexis Brossard (Triumf)02/09/2026, 10:15Oral Presentation
Neutron cooling in the TUCAN source is achieved through a three-stages system. First, room-temperature heavy water provides thermalization. This is followed by liquid deuterium at 20 K for further cooling, and finally by isopure helium-4 at 1 K, which enables superthermal ultracold neutron (UCN) conversion.
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The liquid deuterium moderator was the final component of the source to be... -
Guillaume Pignol (LPSC Grenoble)02/09/2026, 11:05Oral Presentation
The mercury co-magnetometer used in neutron EDM experiments relies on optical detection of the atomic spin precession. The probe light itself induces a shift of the precession frequency, proportional to the light power, know as the light shift.
This phenomenon was discovered by Cohen-Tannoudji in the early 1960s, who identified two distinct mechanisms: the virtual light shift, occurring...
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Luz Sanchez-Real Zielniewicz (ETH Zürich)02/09/2026, 11:45Oral Presentation
A precise determination of the magnetic field gradients inside the n2EDM apparatus is essential for controlling systematic effects in the neutron EDM measurement. The experiment is equipped with an array of optically pumped cesium magnetometers (CsM), which continuously measure the magnetic field surrounding the precession chamber. We present the gradient reconstruction method developed using...
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Antoine Vezon02/09/2026, 12:10Oral Presentation
The extraction of the neutron Electric Dipole Moment (EDM) is a high-precision measurement obtained through multiple analytical steps. Since these steps involve human analysis, they may be unintentionally biased by the analysts' expectations. To mitigate this bias in the n2EDM experiment, a randomly generated false EDM value is injected into the dataset.
The blinding program uses this false...
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Amala Jaison (University of Manitoba)02/09/2026, 16:30Oral Presentation
Magnetic-field uniformity is a critical requirement for neutron electric dipole mo-
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ment (nEDM) experiments, where magnetic-field gradients can reduce neutron spin
coherence and contribute to systematic frequency shifts. The TUCAN (TRIUMF Ultra
Cold Advanced Neutron) EDM experiment at TRIUMF requires a stable and homoge-
neous magnetic-field environment for precision neutron... -
Steven Clayton (Los Alamos National Laboratory)02/09/2026, 16:55Oral Presentation
A magnetic impurity scanner was developed to qualify components for the magnetically shielded environment of the Los Alamos nEDM experiment. The scanner uses a turntable on an air bearing to move samples under a magnetometer which itself can be moved to different turntable radii with a gantry robot. This is all contained within a small magnetically shielded room. This presentation will go over...
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Cameron Blake Erickson (PSI - Paul Scherrer Institut)02/09/2026, 17:20Oral Presentation
Modern neutron electric dipole moment experiments require high precision characterization of magnetic fields to adequately control systematic uncertainties. The measured magnetic fields are modeled by an expansion that practically must assume a finite order and often that the experimental volume is free of magnetic sources. Magnetic contamination, defined as unintended magnetic fields...
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Noah Yazdandoost (TRIUMF)03/09/2026, 09:00Oral Presentation
The world-leading high-density UCN source developed for the TUCAN EDM experiment provides the statistical foundation for reaching improved sensitivity to the neutron electric dipole moment. With increased UCN density, the TUCAN collaboration aims to reach a statistical sensitivity at the $\sim 10^{-27}\ e\,\mathrm{cm}$ level in an initial measurement campaign. To realize this goal, the...
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Morgan Ferry (LPSC)03/09/2026, 09:25Oral Presentation
This work is part of the n2EDM experiment located at Paul Scherrer Institut (PSI) in Switzerland. The nEDM measurement principle is based on the use of two precession chambers, one above the other, and separated by a high voltage electrode. Mercury vapour is used as a comagnetometer in order to measure the average magnetic field in the same volume as ultra cold neutrons (UCN). By measuring the...
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Thomas Hepworth03/09/2026, 09:50Oral Presentation
UCN data is often analyzed by empirical models and fit parameters. This limits interpretability of measurements, projecting away information of well understood particle level dynamics. We present a physical inference on UCN storage and accumulation data from the SuperSUN source at the ILL, allowing for reconstruction of in-situ total energy spectra and associated physics. The model will be...
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Kelin Qiao (The University of Osaka / Research Center for Nuclear Physics (RCNP))03/09/2026, 10:15Oral Presentation
A spallation-driven ultracold neutron (UCN) source developed by the TRIUMF Ultra Cold Advanced Neutron (TUCAN) collaboration has recently been commissioned. Reliable simulations and optimization of the setup require a good understanding of the velocity spectrum of UCNs produced in the source. To address this, a vertical time-of-flight (ToF) spectrometer has been developed and applied to...
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Esther Louise Chauvel (PSI - Paul Scherrer Institut)03/09/2026, 11:10Oral Presentation
The search for the neutron electric dipole moment relies on the interaction of a possible neutron electric dipole moment with an applied electric field. The n2EDM experiment is therefore designed to operate with a high voltage system capable of stable operation at the nominal electric field of 15 kV/cm with regular polarity reversals to maximize sensitivity while suppressing systematic...
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Dr Takeyasu Ito (Los Alamos National Laboratory)03/09/2026, 11:35Oral Presentation
The cryogenic approach to the search for the neutron electric dipole moment—performing the experiment in superfluid liquid helium—holds promise for a substantial increase in sensitivity, potentially enabling a sensitivity level of $10^{−28}$ e cm. A crucial component in realizing such an experiment is the high-voltage and electrode system capable of providing an electric field of 75 kV/cm....
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Dr Geza Zsigmond (PSI - Paul Scherrer Institut)03/09/2026, 12:00Oral Presentation
Neutron particle-tracing simulations with the MCUCN code provide valuable insights into the expected ultracold neutron (UCN) performance of the n2EDM experiment at PSI, an input that also determines the statistical sensitivity. They also give reference estimates for further improvements to the UCN optics elements of the apparatus. One important aspect is the definition of the roughness...
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Wenting Chen (PSI - Paul Scherrer Institut)03/09/2026, 14:30Oral Presentation
on behalf of the nEDM collaboration
Understanding the spin-precession behavior of ultracold neutrons and cohabiting mercury atoms in a magnetic field is essential for the neutron EDM analysis. In this work, we present an improved determination of the neutron-to-mercury gyromagnetic ratio using the n2EDM apparatus at PSI. A global-fit method is applied to investigate gravitational frequency...
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Katherine Zine (University of Illinois Urbana-Champaign)03/09/2026, 15:10Oral Presentation
Two double armed spin analyzers (DSAs) will be used for the Neutron Electric Dipole (nEDM) experiment at Los Alamos National Laboratory (LANL). These DSAs are meant to count the populations of high and low field seeking neutrons at the end of the experiment in order to calculate whether an nEDM is seen. Each arm will count a different population of neutron (i.e. high-field seeking vs low-field...
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TUSHAR TUSHAR (University of Manitoba)03/09/2026, 15:35Oral Presentation
The TRIUMF Ultra Cold Advanced Neutron (TUCAN) Collaboration has commissioned a new spallation-driven ultra cold neutron (UCN) source that provides unprecedented UCN density for conducting the next generation of precision nEDM measurements. A UCN Detector System capable of efficient operation at high UCN flux and with low backgrounds will be important for completing this precision...
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Rolf José Koch (PSI - Paul Scherrer Institut)03/09/2026, 16:30Oral Presentation
The n2EDM experiment at PSI searches for the neutron electric dipole moment using stored ultracold neutrons. Its vacuum and gas system must
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simultaneously support UCN storage, high-voltage stability, the ¹⁹⁹Hg
comagnetometer, helium buffer-gas operation, and discharge cleaning. I
present an overview of the system and its recent automation: a state
machine that reduces operation to... -
Xiaozhe Zhu (Graduate Student)03/09/2026, 16:55Oral Presentation
Achieving nT/m-level magnetic-field uniformity and isolating the time-dependent field noise inside the measurement cells of the nEDM@SNS experiment requires additional magnetic shielding around the magnet package. In this talk, I will present the design and performance of a superconducting lead shield developed for the experiment. The shield uses a modular geometry that is installed around the...
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Anthony Lejuez (TRIUMF)03/09/2026, 17:20Oral Presentation
The search for the neutron electric dipole moment (nEDM) with the TUCAN experiment at TRIUMF requires a well-controlled magnetic environment, in which both the residual magnetic field and its spatial gradients are minimized. This is provided by a MSR (with a shielding factor of 60 000 at 0.01Hz), which serves as the central infrastructure for generating and maintaining the low-magnetic-field...
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Luca KaessPoster
Polarising beams of ultracold neutrons (UCN) is crucial for many precision experiments, e.g., the measurement of the neutron electric dipole moment or the beta decay asymmetry. Modern polarisers usually rely on the longitudinal Stern-Gerlach effect, where strong (superconducting) magnets create fields of several tesla, effectively repelling the undesired spin state and only transmitting the...
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Xuefen Han (Technical University of Munich)Poster
A separation foil is a crucial component in superthermal ultracold neutron (UCN) sources. Its primary function is to prevent contamination from external gases. Formvar, owing to its ability to form extremely thin and mechanically stable films, enables UCN to pass via quantum tunneling and thus represents a promising candidate for next-generation separation foils.
In this work, Formvar foils...
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Riley Kibbee (University of Illinois, Urbana-Champaign)Poster
SuperSUN is a superthermal source for ultracold neutrons (UCNs) located at the Institut Laue-Langevin (ILL). Designed to have a saturation of 4E6 UCNs in the convertor volume, or a UCN density of 282/cc. It has reached operation within 3% of this goal with plans to increase this design value to 2E7 (1408/cc) with polarized neutrons using a magnetic octupole reflector. In this poster, we...
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Luis Enrique Cueva Guzman (TUM)Poster
At the Technical University of Munich (TUM) - FRM II, a source for ultracold neutrons (UCN) is currently under construction, and a dedicated user program is under development. This poster provides an overview of the current status of the source and the ongoing scientific activities in the field of ultracold neutron physics at TUM. Furthermore, my PhD research focuses on new neutronic...
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