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Upgrades and patches
Michal Dušek | Tue, Jul 29, 2025
(updated Wed, Oct 8, 2025)
Upgrades for Jana2020 are available several times a year. In between these upgrades, ongoing development of the program occurs, resulting in patches that are released very frequently, sometimes even several times a week.
To obtain the correct patch, you must first install the latest version of the program from the Downloads section on the program's website. After launching the program, you can download the patch by clicking the "Download patch" button in the About section of Jana2020. This will download the file jana2020-patch.exe, which can be found in the directory where the program is installed.
Next, you’ll need to complete a few manual steps: first, close the program and rename jana2020-patch.exe to jana2020.exe. Then, reopen the program and check in the About section of Jana2020 using the "Detailed info" button to confirm that you are indeed using the correct patch.
Naveen Kumar Chogondahalli Muniraju Wed, Oct 1, 2025
Dear Michal,
I am running the latest version available for download, #1.3.61. It is not possible to patch it since it does not correspond to the 'newest version 2.1'. Where can I obtain the installation files of version 2.1?
Thank you.
-Naveen
Mariam Pogosova Wed, Oct 8, 2025
Dear Jana-developers team,
Recently, I found a publication devoted to the better evaluation of the Theta shift for the case of Debye-Scherrer geometry combined with the flat 2D detector.
(Please see the article doi.org/10.1107/S1600576722011360)
I would love to hear your thoughts on this. Seemingly, such a setup is fairly common (I see it often in synchrotron setups) - and, maybe, you might consider adding a similar equation / function in further Jana updates?
Do you think the existing Theta shift tools (zero shift / sycos / sysin) can still effectively describe the shifts observed in such a setup (Debye-Scherrer + 2D detector)?
Perhaps you could recommend which option among the existing ones would be the best choice?
I would deeply appreciate your response.
Thank you very much for your time!
Sincerely,
Mariam
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Listed space group is incompatible with Laue class
Klar, Paul Benjamin | Mon, Oct 5, 2026
There seems to be a problem with the symmetry wizard. A colleague encountered a case where the space group selection menu offered one orthorhomic space group (Pccm) alongside several monoclinic space groups, although in the menu before Laue class 2/m was selected. The unit cell angle beta is about 100 degrees and there is no orthorhombic candidate supercell. The symmetry selection then moves on with problems. All unit cell angles in the m50 file are set to 90 degrees and the selection of the correct space group (P 1 21 1) fails with an error message like the one shown in the screenshot.
I only have the attached screenshot. I could get the Jana files from my colleague if needed.
(Independent of this bug report: The footer of this very page has a little typo. "Jana is developped at")
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Problem with occupancies
Hafsa Zeroual | Sat, Sep 26, 2026
(updated Thu, Oct 1, 2026)
Hello,
I am refining occupancies of atoms with shared positions and ADPs and an overall occupancy sum constrained to 1. I don't understand why Jana2020 does not respect this constraint at all (e.g sometimes it gives occupancies of 2 for one atom, or a negative occupancy, or a sum that exceeds 1). I checked the refinement restrictions and it was well written there.
Thank you in advance for your reply.
Michal Dušek Thu, Oct 1, 2026
Hello,
If one occupancy is negative and the other positive, and their sum equals 1, this means the mixed elements are either in contradiction with the diffraction data or the diffraction data are not accurate enough to distinguish these elements. The second case could be detected by fixing the elements in various ratios and seeing the effect on the R values. On the other hand, if the sum is not 1, it might be a problem with the initial occupancy values, since we usually keep their overall sum (if you don't use Equations).
Best wishes,
Michal
