- users - SasView Mailing Lists

SasView mailing lists moving to a new server this week
by Paul Butler via users 14 Jul '26

14 Jul '26

Dear SasView Users, Quick heads-up: sometime this week we'll be moving the SasView mailing lists (i.e., users, developers and help) onto a new server and upgrading from the old list software at the same time. The current server is well past its supported life and is being retired for security reasons. For almost all of you this will be invisible — the list addresses don't change and your mail keeps arriving as usual. A couple of things a few of you might notice: - Messages will now come from the new system, so they may look slightly different, and there is a small chance your mail provider might file the first one or two as spam. If that happens, just mark them "not spam." - If you'd set up a login to manage your own delivery settings, that login won't carry over — you'll need to register again on the new site (your list email address plus a new password). Everything else comes across automatically: all memberships and their delivery preferences, plus the full message archives — which are now searchable on the new system. Thanks for your patience during the move, and feel free to email help(a)sasview.org with any questions or concerns. Cheers Paul (for the SasView leadership team)

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Model building in sasview
by Harrison Laurent via users 02 Jul '26

02 Jul '26

Hello, I hope you are well. I am currently trying to build a reasonably complex model within sasview and have gone to the guide on how to manage this. I see in the documentation (SasView-6.1.3/sas/docs/user/qtgui/Perspectives/Fitting/fitting_help.html) that to achieve this one creates a 'simple' model combining two established models, then opens the model in the model editor. One can then add/multiply several different functions together by editing the text after 'load_model_info'. My question is how do I account for multiplying several summed models by a single other model, as brackets seemingly cannot be used. AKA how do I achieve the following sort of functions: (sphere + gaussian_peak + sphere)*user_defined_fractal_model ((sphere + gaussian_peak) + sphere)*user_defined_fractal_model ((sphere + sphere)*user_defined_fractal_model) + gaussian_peak Any insight you have would be extremely helpful. Thank you so much. All the best, Harrison Laurent

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help troubleshooting the low scattering intensity saxs data
by via users 06 Nov '25

06 Nov '25

Hi I need help from SASView experts. I started using it to fit my liposome saxs data just today for the first time. My scattering intensity data are very low ranging from 10^-3 to 10^-1. So, when I use lamellar_hg fit for my unilamellar popc vesicles I get ginormous chi squared values like 10^12. Please help me to improve my fitting. Thank you! Best Meko

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Upcoming SasView tutorial
by Paul Butler via users 10 Oct '25

10 Oct '25

Dear SasView Users, In anticipation of the upcoming SasView contributor camp to be held in Garching Nov 11-17 this year, the host institution requested a SasView tutorial be offered prior to the camp. This is taking the form of a two half day intermediate level SasView usage tutorial offered over zoom on Thursday and Friday October 23 and 24. The program is available at: https://indico.frm2.tum.de/event/594/ If you are interested in the program, registration is now open to anyone on a first come first served basis via the above link. Cheers Paul Butler, Annika Stellhorn, and Neelima Paul

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Bug Report – Unexpected Behavior of Polydispersity in SASview v6
by Abdoltajedini, Fatemeh via users 09 Oct '25

09 Oct '25

Dear SASview Team, I would like to report a possible bug I encountered in SASview v6 related to polydispersity. Description of the issue: When I add polydispersity to a model, the scattering curve changes far more dramatically than expected. Even small values (e.g., 0.05 on radius) cause the intensity and curve shape to shift disproportionately, which does not seem physically reasonable. Steps to reproduce: 1. Open SASview v6. 2. Load the [Core-Shell Cylinder]. 3. Fit the model without polydispersity – the curve looks reasonable. 4. Add a small polydispersity (e.g., 0.05 on radius). 5. The curve changes strongly in both shape and magnitude. Expected behavior: Polydispersity should broaden or smooth features of the scattering curve, but not cause large intensity changes or unrealistic distortions. Observed behavior: Even small polydispersity values produce a strong, unrealistic effect. Environment: * SASview version: 6.x * Operating system: Windows * Data used: experimental data Thank you for your help and for maintaining this valuable software. Best regards, Fatemeh

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SasView 6.1.1 Released
by Stephen King - STFC UKRI via users 03 Oct '25

03 Oct '25

Dear Members of the SasView Users List, We are pleased to inform you that we have just released an update to SasView, SasView 6.1.1, available as usual through the SasView website<https://www.sasview.org/>. This is a bug fix release rectifying some issues identified in the recent 6.1.0 release this summer. For those that prefer to build their installation from source (eg, Linux users), SasView is also available through Flatpak<https://flathub.org/apps/org.sasview.sasview>. However, it may take a few more days before 6.1.1 makes its way onto Flathub. We would also like to remind you about the SasView Contributor Camp XIV<https://indico.ess.eu/event/3800/> to be hosted by TU Munich, Garching, Germany between November 11-17th, 2025. In particular, in response to community demand the scope of this Camp has been expanded from its original focus on the needs of the Magnetic SAS and allied communities (ie, those SAS users producing more complex data than isotropic powder patterns) to now include Life Sciences. Please see the planning wiki at https://github.com/SasView/sasview/wiki/ContributorCampXIV for more information. Thank you for your continued support! And, as ever, if you would like to get involved, please see https://www.sasview.org/contribute/ for further information. The SasView Collaboration

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Upcoming Marketplace outages
by Stephen King - STFC UKRI via users 30 Sep '25

30 Sep '25

Dear SasView User, Over the next few weeks work will be ongoing to move the SasView Model Marketplace<https://marketplace.sasview.org/> to a new server. This will inevitably mean that there will be periods when the Marketplace will be unavailable. Please bear with us whilst we undertake this critical infrastructure work. And if you have an urgent need for a Marketplace model during an outage, please email help(a)sasview.org<mailto:help@sasview.org> as the Contributor Team will have access to a backup copy. The SasView Contributor Team

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New SasView Release (6.1.0) & Upcoming Workshops
by Stephen King - STFC UKRI via users 03 Jul '25

03 Jul '25

Dear Members of the SasView Users List, It gives us great pleasure to inform you that we have just released an update to SasView, SasView 6.1.0, available as usual through the SasView website<https://www.sasview.org/>. This is a major release with some exciting new tools, some important improvements and, of course, the usual bug fixes. We believe this to be one of our most significant releases to date. For those that prefer to build their installation from source (eg, Linux users), SasView is also available through Flatpak<https://flathub.org/apps/org.sasview.sasview>. We regret we are still unable to provide a conda distribution for SasView 6.x, but work is in progress to develop wheels available on PyPI (our wheels are just a little too big at the moment!). This release comes, not entirely coincidentally, just a couple of days ahead of the ICNS-2025 conference in Copenhagen/Lund. Several SasView Developers and Contributors will be present, so please do say 'hello' if you are able! SasView contributors from the Magnetic SANS community are also organising two events this year which may be of interest to some of you: * The first is a mini-symposium on “Magnetic SAS Data Analysis – State-of-the-Art and Future Improvements”<https://indico.ess.eu/event/3704/>, which will take place during the ICNS-2025 conference on Wednesday, July 9th, 2025, at the Bella Center in Copenhagen, Denmark; * The second is SasView Contributor Camp XIV<https://indico.ess.eu/event/3800/> to be hosted by TU Munich, Garching, Germany between November 11-17th, 2025. This will largely follow the format of the hugely successful Camp in Delaware last year, but with more of a focus on the needs of the Magnetic SAS and allied communities (ie, those SAS users producing more complex data than isotropic powder patterns). Thank you for your continued support! And, as ever, if you would like to get involved, please see https://www.sasview.org/contribute/ for further information. The SasView Collaboration

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New SasView Release (6.0.1) & Upcoming Workshops
by Stephen King - STFC UKRI via users 22 Mar '25

22 Mar '25

Dear Members of the SasView Users List, We hope you have had a productive start to 2025. We would like to take this opportunity to inform you that we have just released an update to SasView, SasView 6.0.1, available as usual through the SasView website<https://www.sasview.org/>. This is a minor release but fixing some bugs<https://github.com/SasView/sasview/releases/tag/v6.0.1> in 6.0.0., including several associated with plotting. For those that prefer to build their installation from source (eg, Linux users), SasView is now also available through Flatpak<https://flathub.org/apps/org.sasview.sasview>. We regret we are still unable to provide a conda distribution for SasView 6.x, but work is in progress to develop wheels available on PyPI. This work is anticipated to be part of the next release slated for June 2025. In other news, SasView contributors from the Magnetic SANS community are organising two events later this year which may be of interest to some of you: * The first is a mini-symposium on “Magnetic SAS Data Analysis – State-of-the-Art and Future Improvements”<https://www.sasview.org/2025-01-24-magsas-symposium-at-icns25/>, which will take place during the ICNS-2025 conference on Wednesday, July 9th, 2025, at the Bella Center in Copenhagen, Denmark; * The second is a SasView Contributor Camp to be hosted by TU Munich, Garching, Germany between November 11-18th, 2025. This will largely follow the format of the hugely successful Camp in Delaware<https://www.sasview.org/2024-02-09-contributorcamp-12-report/> last year, but with more of a focus on the needs of the Magnetic SAS and allied communities (ie, those SAS users producing more complex data than isotropic powder patterns). Thank you for your continued support! And, as ever, if you would like to get involved, please see https://www.sasview.org/contribute/ for further information. The SasView Development Team

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ICNS2025 mini-symposium on “Magnetic SAS Data Analysis – State-of-the-Art and Future Improvements” now open for registration
by Annika Stellhorn via users 23 Jan '25

23 Jan '25

Dear colleagues, We are pleased to announce the ICNS-2025 mini-symposium on “Magnetic SAS Data Analysis – State-of-the-Art and Future Improvements”, which will take place during the ICNS on Wednesday, July 9th, 2025, at the Bella Center in Copenhagen. Please note that participants must be registered for ICNS-2025 to attend. Registration for the symposium is now open at the following link: https://indico.ess.eu/event/3704/ A current bottleneck in maximizing the outcomes of magnetic and polarized SANS experiments is a lack of a common, robust, maintained, and intuitive data analysis tool. The aim of this mini-symposium is to identify constraints and define missing functionality in existing analysis programs with a view to preparing for their implementation into SasView. Several improvements to the handling and simulation of magnetic scattering patterns in SasView have recently been implemented, including upgrades to the Generic Scattering Calculator tool, and the integration of additional slicer (ROI) options. But future developments might include, for example, features dedicated to the analysis of 2D/3D images, independent nuclear and magnetic fitting models, the simultaneous fitting of multiple cross-sections, or Reverse Monte Carlo techniques. Some of this functionality may also be of interest to other communities generating quasi-crystalline or anisotropic data such as Rheo-SAS and SAS-Tomography. A goal of this mini-symposium is to identify that functionality with the broadest impact. Interested participants are therefore cordially invited you to join us for an afternoon of short presentations and topical discussions designed to help identify the future opportunities for advancing the analysis of these systems. On behalf of the SasView developers’ team, Paul Butler, Stephen King, Wojtek Potrzebowski, and Annika Stellhorn

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