McXtrace - Monte Carlo Xray Tracing, is a joint venture by

Our code is based on technology from

Code repository (shared with 'McStas') is located at github.com/mccode-dev

For information on our progress, please subscribe to our user mailinglist..

To download the latest release: download area
For installation instructions :

McXtrace 3.x installation

For a quick list of the available commands: commands

Recent McXtrace News

Migrating from McXtrace 1.x to 3.x? - Use the wiki-based guides

March 31st: First circular: PHOTONS AND NEUTRONS REALISTIC ARTIFICIAL INTELLIGENCE DATASETS (PaNRAID)

Dear Colleagues,

In collaboration with the French DIADEM Academy, we invite interested participants to attend the following course in September:

PHOTONS AND NEUTRONS REALISTIC ARTIFICIAL INTELLIGENCE DATASETS (PaNRAID)

Dates: 21-25 September
Location: Île d’Oléron, France

Objective

The course will develop an integrated approach for generating synthetic data for supervised learning. This approach combines multi-scale materials simulations (DFT, MD, XAS spectroscopy) with comprehensive digital twins of experimental X‑ray and neutron facilities, explicitly accounting for instrumental effects and experimental artefacts.

Intended audience

Doctoral students
Postdoctoral researchers
Faculty and teaching-research staff
Researchers and research engineers

Further information and pre-registration: https://formation.pepr-diadem.fr/formation-panraid

Attached are PDF flyers in French and English.

Best regards,
Peter Willendrup

March 28th, 2026: McXtrace 1.x and McStas 2.x formally out of support

Dear all,

We have decided to formally declare that we no longer support McXtrace 1.x and McStas 2.x, so user issues with these released will from now on always prompt us to request that you upgrade.

If you are still running such an old release, please upgrade and port your comps/instruments using the information in the use the wiki-based porting-guides

We are of course at your service if you have issues porting your existing code, please create a GitHub issue .

January 7th, 2026: McStas and McXtrace 3.6.5 released

McStas and McXtrace release 3.6.5 is now available.
McXtrace installation instructions are found on GitHub .

What's Changed - Main Changes:

Bugfixes, new features, all common to McStas and McXtrace:

macOS bundles in 3.6.1 did not actually install that version but something earlier. Fixed by pinning in yml file, @willend in #2285
PDF manuals had wrong version numbers, @willend in #2285
Allow mcrun / mcdisplay to run / visualize without access to .c/.instr by @willend in #2281
mcgui/mxgui editable font colors, handle long filenames without extreme window resizing by @willend in #2275
Fix cross-platform sort-order issue in PowderN by @willend in #2272
Platform-independent reflection list sort in Single_crystal by @willend in #2273
mcrun/mxrun: feature addition - scan by seed by @willend in #2276
Add mcplot toggle to "plot 1D-curves from 0-value" in linear mode by @willend in #2278
Add commentstring to vim editor by @Lomholy in #2284