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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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how to save theory for multiple trials?
by Hubert King via users 28 Dec '24

28 Dec '24

I'd like to use sasview to test several sets for a given theory (core-shell) I can't seem to save each trial as a project When i save project and reopen, the model type and parameters have vanished There are no data, just calculations Hubert King

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SasView News and a New Release (6.0.0)
by Stephen King - STFC UKRI via users 22 Nov '24

22 Nov '24

Dear Members of the SasView User List, We hope this email finds you safe and well. GENERAL NEWS It is 18 months since our last release of SasView but in that time the Developer Community has been quite active. A new release, SasView 6.0.0, now brings a raft of new features, feature enhancements, bug fixes and improvements in documentation, as well as a new icon! Importantly, SasView 6.0.0 also (finally) achieves feature-parity with SasView 4.x. We hope you like it! We would like to remind you that there is no active development of SasView 4.x, nor has there been any for several years, and now with the release of SasView 6.x we shall cease development of SasView 5.x. All users are therefore strongly encouraged to upgrade to SasView 6.x. However, multiple versions of SasView can be installed and used alongside one another provided they are installed to different folders. In other news: * A Core Developer Code Camp was held in Abingdon, UK in September 2023. This was followed by a (now rebranded) Contributor Camp at the University of Delaware<https://www.sasview.org/2024-02-09-contributorcamp-12-report/>, USA in January 2024. The latter was a huge success with over 30 people taking part, two-thirds of them first-timers and one-third from outside the USA, from some 15 different facilities or universities! * In November 2024, several SasView developers and contributors attended SAS-2024 in Taipei where they delivered an afternoon tutorial session on SasView to a packed audience! * You can now follow and tag SasView on LinkedIn! #SasView<https://www.linkedin.com/company/sasview> * SasView continues to benefit from great work by vacation students and interns embedded at large-scale scattering facilities or in university research groups and mentored by members of the established SasView developer community. There have been around a dozen such contributors to date. Examples of some of the recent work they have undertaken include: o Refactoring how SasView handles its data objects o Reimagining plot handling o Weighting in constrained fitting o Extended support for the analysis of Magnetic-SAS If you want to see some aspect of SasView developed and have the funds/resources to offer such positions we would love to hear from you! NEW RELEASE The Development Team is pleased to announce the release of SasView 6.0.0, available for download as usual through the website at www.sasview.org<http://www.sasview.org>. This is a major release with many new features and enhancements, including: * A What's New window has been introduced. * A Preferences option has been introduced, along with a screen scaling factor (useful when running SasView on laptops/notebooks). * The Orientation Viewer tool, last seen in SasView 4.x, has been re-introduced. * It is now possible to assign relative weights to different data sets when doing constrained/simultaneous fits (useful for co-fitting SAXS and SANS data, for example). * The Corfunc (correlation function) analysis perspective has been completely overhauled. * The Debye scattering calculation in the Generic Scattering Calculator tool has been made significantly faster (useful if computing scattering from PDB files, for example). * New slicers for the analysis of 2D data have been added. For the full details of what has changed, be sure to read the Release Notes<https://github.com/SasView/sasview/releases/tag/v6.0.0>. Mac users might like to note that there are now separate installers for both Apple silicon and Intel architectures. Please note that at the time of writing we are unable to offer a conda package for SasView 6.0.0 due to issues beyond our control, but we are working towards one. However a 'Flatpak' for Linux is available on request to help(a)sasview.org<mailto:help@sasview.org>. NEW MODELS The following models have been added to the Model Marketplace since v5.0.6 was released: * Binary Blend (revised) * core_multi_shell_cylinder * fuzzy_sphere_extended * Superball (a cube with rounded edges) * Supercylinder (a superellipsoid) * Spherical Micelle * Cylindrical Micelle * Long Cylindrical Micelle * Enhanced Cylinder Models for SasView (improved integration accuracy and performance) * Enhanced Ellipsoid Models for SasView (improved integration accuracy and performance) KNOWN ISSUES The rpa (Random Phase Approximation, for polymer scattering) model remains withdrawn in the SasView GUI whilst we deal with a UI problem. However the rpa model is available from the scripting interface. As a partial workaround for those that prefer to use the GUI, a Binary Blend model<https://marketplace.sasview.org/models/124/> is available on the Marketplace. Most plots are currently being displayed on log-log axes, even those that it really doesn't make sense for, like the residuals! This will be fixed in the next point release. Of course, as always, there remain many things that could be added, improved or, sadly, that need fixing. So please continue to provide feedback, bug reports (issues), and, when possible, fixes, either to the code or the documentation or tutorials, as GitHub pull requests, for those who can, or by simply emailing help(a)sasview.org<mailto:help@sasview.org>. FUTURE PLANS A Mini SasView Contributor Camp<https://indico.linxs.lu.se/event/526/>, in association with the LINXS advanced study institute, is to be held in Lund, Sweden January 9-10 2025. And we are also considering another in the Fall of 2025 (date & venue tbc). Meanwhile the SasView magnetic scattering community are holding a satellite workshop at the ICNS 2025 Conference, July 6-10 2025. Registrations will open soon! Please keep an eye on the SasView webpage (www.sasview.org<http://www.sasview.org>) or the ICNS conference webpage (https://icns2025.dk/) Meanwhile, if you would like further details, please contact Annika Stellhorn<mailto:annika.stellhorn@ess.eu>. There are also ideas for a magnetic scattering-themed SasView Contributor Workshop later in 2025. 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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Cannot find 'sas' module in sasmodels package
by Ian Billinge via users 03 Jun '24

03 Jun '24

Hello everyone, I am trying to run the scripting tutorial <https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/scripting.html>, and I am unable to run the code because I can't import the 'sas' package. When I run the import statements at the top of the tutorial, i.e. import sys > from bumps.names import * > from sasmodels.core import load_model > from sasmodels.bumps_model import Model, Experiment > from sasmodels.data import load_data, set_beam_stop, set_top I get > --------------------------------------------------------------------------- > ModuleNotFoundError Traceback (most recent call last) > Cell In[9], line 4 > 2 from bumps.names import * > 3 from sasmodels.core import load_model > ----> 4 from sasmodels.bumps_model import Model, Experiment > 5 from sasmodels.data import load_data, set_beam_stop, set_top > > File > ~/micromamba/envs/smi_py311/lib/python3.11/site-packages/sasmodels/bumps_model.py:20 > 16 __all__ = ["Model", "Experiment", "BumpsParameter"] > 18 import numpy as np # type: ignore > ---> 20 from .data import plot_theory > 21 from .direct_model import DataMixin > 23 # pylint: disable=unused-import > > File > ~/micromamba/envs/smi_py311/lib/python3.11/site-packages/sasmodels/data.py:39 > 37 import numpy as np # type: ignore > 38 from numpy import sqrt, sin, cos, pi > ---> 39 import sas > 40 # pylint: disable=unused-import > 41 try: > > ModuleNotFoundError: No module named 'sas' I apparently have sasmodels installed, since I can successfully import load_model from sasmodels.core. However, it seems I am missing the sas package. I have searched online and wasn't able to find any such package. I ran a simple pip install sas, and indeed, something downloaded, but it didn't resolve the issue. Any insights on the issue would be most appreciated. Best, Ian Billinge -- Ian Billinge *he/him/his* Ph.D Student, Yip Lab Dept. of Earth & Environmental Engineering Fu Foundation School of Engineering Columbia University in the City of New York

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Re: [SasView Users] Inquiry regarding fitting the SAXS data
by Rini P R via users 18 Apr '24

18 Apr '24

Hi Paul, Thank you very much for your email and for providing all the helpful links. It helps a lot! I have found that the Raspberry model is not suitable for my systems, so I have created a plugin model using the power law and a cylinder. However, I needed to include the hayter_msa as structure factor. The tutorial showed how to include the structure factor in these plugin models, and I tried to follow the same steps. [cid:86df6596-a5bf-4b17-a433-caa8f0f6b7a6] [cid:7ecbfbc7-e18e-4ea2-ae0b-2d12632bc35c] But when I tried to do that I am getting an error message in Sasview as [cid:f6b1c3fe-8b00-4a40-a367-286adf4d1faf] I tried to multiply the plugin model with structure factor, but I do not get the screen that I am supposed to get. I am using sasview 6.0.0a1 which I downloaded from the github. Could you please look into it and tell me what is the source of the error? Best regards, Rini PR PhD candidate Institute for Energy Technology (IFE) Kjeller, Norway Workplace: Soft and Complex matter lab Department of Physics Norwegian University of Science and Technology (NTNU) Trondheim, Norway ________________________________ From: Paul Butler <butlerpd(a)udel.edu> Sent: Wednesday, April 17, 2024 16:46 To: Rini P R <rinipr(a)stud.ntnu.no> Cc: users(a)sasview.org <users(a)sasview.org> Subject: Re: [SasView Users] Inquiry regarding fitting the SAXS data Hi Rini, Just to clarify your question. I assume you are saying that the “raspberry model,” which was developed by the Pozzo group at the University of Washington to model pickering emulsions is not suitable for your case and you have developed your own plugin model? Or is the question how to write a plugin model based on a model you have developed theoretically? Or is the question that your plugin does not allow you to multiply a structure factor with it?. Or are you wanting to write your own structure factor plugin? If in fact that next to last is what you are looking for, that should be pretty straightforward. Basically you will need to define the effective radius for interactions in your plugin model as described here: https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#fo… If you also want to be able to include the beta approximation option you will also need to calculate the F(Q) in your model (currently would require a c model) and declare that Fq is available in the python part of your model as described here: https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#st… Finally, if you want to create a structure factor you just need to include that flag (structure_factor=true) as explained here: https://www.sasview.org/docs/user/qtgui/Perspectives/Fitting/plugin.html#mo… Also we now have a tutorial on writing custom models available here: https://www.sasview.org/downloads/creating_custom_fitting_models_in_sasview… Let me know if any of this helps, if you need more information, or if you are looking for something completely different Stay safe Paul Butler developer team member On Wed, Apr 17, 2024 at 5:11 AM Rini P R via users <users(a)lists.sasview.org<mailto:users@lists.sasview.org>> wrote: Dear SasView Team, I hope this message finds you well. My name is Rini and I am a PhD candidate in the Department of Physics at the Norwegian University of Science and Technology, Trondheim, Norway. I have a specific question and I'm not sure who to contact. We are working with Pickering emulsions made with food-grade materials and have encountered challenges in fitting the data from our recent SAXS experiment with the available models. We have concluded that combining a structure factor with our current plugin model will enable us to fit our data and extract the information we need. Could you please direct me to the right person or help me get in touch with someone who can assist us with modifying the model as described? Thank you in advance for your time and support. Best regards, Rini PR PhD candidate Institute for Energy Technology (IFE) Kjeller, Norway Workplace: Soft and Complex matter lab Department of Physics Norwegian University of Science and Technology (NTNU) Trondheim, Norway _______________________________________________ users mailing list users(a)lists.sasview.org<mailto:users@lists.sasview.org> http://lists.sasview.org/cgi-bin/mailman/listinfo/users

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Inquiry regarding fitting the SAXS data
by Rini P R via users 17 Apr '24

17 Apr '24

Dear SasView Team, I hope this message finds you well. My name is Rini and I am a PhD candidate in the Department of Physics at the Norwegian University of Science and Technology, Trondheim, Norway. I have a specific question and I'm not sure who to contact. We are working with Pickering emulsions made with food-grade materials and have encountered challenges in fitting the data from our recent SAXS experiment with the available models. We have concluded that combining a structure factor with our current plugin model will enable us to fit our data and extract the information we need. Could you please direct me to the right person or help me get in touch with someone who can assist us with modifying the model as described? Thank you in advance for your time and support. Best regards, Rini PR PhD candidate Institute for Energy Technology (IFE) Kjeller, Norway Workplace: Soft and Complex matter lab Department of Physics Norwegian University of Science and Technology (NTNU) Trondheim, Norway

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Inquiry Regarding Model Fitting
by Constantina Sofroniou via users 09 Jan '24

09 Jan '24

Dear SasView team, I hope this email finds you well. My name is Constantina, and I am a post-doc at the Department of Materials, Loughborough University. I have a specific inquiry and am uncertain about the appropriate contact person. We are currently researching liposome-gold nanoparticle interactions and have acquired recent SANS data that poses challenges when fitting it with existing models. Our hypothesis is that gold nanoparticles penetrate the liposome phospholipid bilayer. After reviewing available models, we believe that the raspberry model, with a modification to incorporate a core in the large particle, would be the most suitable for our data (https://www.sasview.org/docs/user/models/raspberry.html) Could you please direct me to the right person or provide assistance in connecting with someone who can help us modify the model as described? Thank you in advance for your time and support. Best regards, Constantina -- Constantina Sofroniou, PhD (she/her) Postdoctoral Research Associate Department of Materials Loughborough University LE11 3TU Loughborough Leicesterhire United Kingdom

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SasView Contributor Camp, 16-22 Jan 2024, Newark, DE, USA
by Stephen King - STFC UKRI via users 22 Nov '23

22 Nov '23

Dear SasView User, Over the past several years a core development team have met approximately annually for a residential Code Camp at which we 'blitz' the worst bugs in SasView, incorporate some new features, and try and keep the documentation as up to date as we can. These Camps have also been an informal and convivial means of promoting the collaborative nature of the SasView development process. However, some of you started to enquire about taking part in future Camps. So in 2019 we hatched plans for something we started calling a Contributor Camp. This was to have taken place in March 2020 but... well, you know the rest of the story! We have now resurrected the concept. So we are pleased to announce that our very first Contributor Camp will take place in Newark, Delaware, USA from the 16th through 22nd January 2024 on the campus of the University of Delaware. For logistical reasons it will be in-person with no virtual attendance. Registration is now live through https://github.com/SasView/sasview/wiki/ContributorCampXII . Registration and attendance are free, but attendees are responsible for their own travel, accommodation and subsistence. The aim of the Contributor Camp is to grow the community of volunteers that can develop, sustain and contribute to SasView into the future. It will do this through a mix of instructional presentations and hands-on tasking in the presence of experienced contributors in an informal 'hackathon' type of environment. Importantly, it will also recognise that there is more to SasView than just coding. We want attendees to contribute where they feel most comfortable, whether that be through core coding, writing plugin models, functionality testing, verifying math, writing/reviewing documentation or tutorials, undertaking sysadmin tasks on our servers, and so on. If you use SasView a lot in your research, and would like the opportunity to give something back, then the Contributor Camp will show you how. Finally, If the Contributor Camp is a success we will plan to run more. So we would also be very pleased to receive offers from anyone willing to be a potential future host. Our needs are modest: a few meeting rooms with reliable wifi, with affordable accommodation and some eateries nearby, and a source of good coffee (mustn't forget the coffee!). If you can help, please let us know at management(a)sasview.org<mailto:management@sasview.org>. We hope to see some of you in January! With Seasons Greetings, The SasView Development Team

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SAXS data analysis
by Benson Jacob via users 05 Sep '23

05 Sep '23

Hello, I am using the SasView software to do SAXS data analysis, and I have a couple of questions. When performing the correlation function analysis, is it possible to save the raw data used to generate the correlation function in a text file in order to replot the data? Also, when I look to perform the invariant calculation, I am loading a .dat file, but the software is unable to generate the 1-D SAXS data plot, and gives an error message when calculating the volume fraction. How can this be resolved? Thank you, Benson -- *Benson J. Jacob* 281-309-8285 | bensonjacob4@g <bensonjacob4(a)tamu.edu>mail.com

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Paracrystal Models Lattice Sites
by Jeremy Shen via users 10 Aug '23

10 Aug '23

Hello, I am a researcher at the University of Michigan interested in simulating paracrystals. I have been experimenting with SasView, and I have generated diffraction patterns from the paracrystal models. I was wondering if it was possible to extract the coordinates of the lattice sites from these models? Do the models generate the diffraction pattern by simulating a paracrystal and then taking the fourier transform, or does it take an "ideal" paracrystal and calculate the diffraction patterns analytically. Thank you for your assistance. Best regards, Jeremy

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