McStas - A neutron ray-trace simulation package

McStas is a general tool for simulating neutron scattering instruments and experiments. It is actively supported by DTU Physics, NBI KU, PSI and ILL.

Simulated scattering from a hollow-cylinder vanadium sample.

The plot shows the intensity of scattered neutrons (red is highest intensity). The sample is at the center of the sphere with the neutron beam coming from the left. Clearly seen is the shadowing effect of the sample causing a lower intensity opposite the beam. Also seen is the effect of the non-symmetric geometry of the sample, causing lower intensity directly above and to the side of the sample.

Recent news

May 2nd, 2013: Updated ESS source components for McStas 1.12c and 2.0

An set of updated ESS source components for use with McStas 1.12c and 2.0 have been put in the download share.

The zip archive includes the following:

Updated ESS source components for McStas 1.12c and 2.0 with
- Cold and thermal moderators
- Cylindrical cold source geometry
- Flat thermal wing geometry
- Geometry close to that from MCNPX
- 2012 cold brightness
- A much easier-to-use definition of geometry, allowing to specify the instrument position within a 60-degree sector
- A couple of bug fixes
Updated Brilliance_monitor.comp for McStas 1.12c and 2.0
ESS_moderator_long_2001.comp for McStas 1.12c (same as included in McStas 2.0)
Test instruments set up for estimating the (cold) source brilliance of ESS in 2012 and 2001 versions
PDF plots of average and peak brilliance as produced by the new McStas source, overlayed on the officialcurve from ESS target division and the corresponding curve from VitESS.

We hope to soon release McStas either a 2.0a or 2.1 which will include these as well as other improvements.

April 6th, 2013: Ubuntu-based Live-DVD with McStas 2.0, 1.12c and iFit available

An updated Ubuntu Live-dvd is available on the Ubuntu page. It includes:

McStas 2.0 and all needed dependencies for Perl- and Python-based tools
McStas 1.12c and all needed dependencies
iFit 1.3.1

Use it to try McStas without installing it to your system, to run McStas in a virtual machine or as an easy way of evaluating differences between 1.12c and 2.0.

March 21st, 2013: Supplemental mcdisplay / Python package available

As of today, our Python-based mcdisplay package is available via either

apt-get install mcstas-tools-python-mcdisplay-2.0 on debian-like systems (if you added our .deb repository)
yum install mcstas-tools-python-mcdisplay-2.0 (if you added our .rpm repository)
- Or for manual download from our Download share

To make use of the package, you need an x3d browser on your system - we recommend Instant Player developed by the Fraunhofer Gesellschaft.

If you want to run a combination of our Python and Perl tools - have a look at File->Preferences in mcgui (see graphic below)

The allows you to define the commands executed from mcgui for running/compiling (mcrun), visualizing (mcdisplay) or plotting data (mcplot) from your instrument. The naming convention is this one (not completely obvious, sorry):

Unix (Linux / Mac OS):

Tool Perl Python

mcrun mcrun-2.0 mcrun-2.0-py

mcplot mcplot-2.0 mcplot-2.0-py (chaco) or mcplot-2.0-matplotlib (matplotlib)

mcdisplay mcdisplay-2.0 mcdisplay-2.0-py

Windows:

Tool Perl Python

mcrun mcrun.pl mcrun-py.bat

mcplot mcplot.pl mcplot-chaco.bat (chaco) or mcplot-matplotlib.bat (matplotlib)

mcdisplay mcdisplay.pl mcdisplay-py.bat

To save your preferences for the next McStas run, use File->Save configuration:

On Unix (Linux / Mac OS) systems to your user's $HOME/.mcstas/ folder
On Windows directly to the system c:\mcstas-2.0\lib\mcstas-tools-2.0\perl folder

March 15th, 2013: (Re-)enable syntax highlighting in mcgui-2.0 on Ubuntu

If your mcgui editor on Ubuntu is missing it's usual syntax highlighting, either

If you installed mcstas via our Debian repository, simply run this command in a terminal:
```
sudo apt-get install libtk-codetext-perl
```
If you installed mcstas "manually" by downloading our set of Debian packags from the download page, first download our 64 bit or 32 bit libtk-codetext-perl package. Secondly install it using
```
sudo dpkg -i libtk-codetext-perl_0.3.4-1_all.deb
```

March 15th, 2013: Component docs are back on website, plus an mcdoc hint

As several people have pointed out, the component docs were removed from the website in connection with the release of McStas 2.0.

They are now back at http://www.mcstas.org/download/components/

I have further become aware that the McStas 2.0 distribution - at least in the debian packages - was missing a call to mcdoc for generating the same pages there

To remedy that problem, please:

cd /usr/local/lib/mcstas-2.0
sudo mcdoc -t

- which should bring back the docs on your local machine.

I am working my way down a list of other annoyances and aim to release a McStas 2.0a with various issues fixed in a few weeks. Please let me know if you found any issue that I can correct in the next release.

March 6th, 2013: Building McStas 2.0 (and the dev-tree) from source code using CMake

Several people have reported difficulties in configuring / building / installing McStas 2.0 from source code. Below you can find some information and hints on building McStas this way.

The configure scripts in the McStas 2.0 packages are partly broken, they will NOT give you a proper build of McStas.
We have made a transition to the CMake build system, and it turns out that you need a CMake > 2.8 for building McStas!
Should you not have a recent enough CMake, you can easily build a new CMake one from source-code using:
- To install Cmake in the default location run
```
./bootstrap
```
  If you need to install somewhere else run
```
./bootstrap --prefix=/somewhere/else
```
- Next run
```
make
```
  to build and
```
make install
```
  to install CMake 2.8 or later.
Once you have a CMake > 2.8 you can build each of the provided McStas source packages using e.g.
- ```
tar xzf mcstas-2.0-src.tar.gz
```
- ```
cd mcstas-2.0-src
```
- ```
mkdir build && cd build
```
- To install in /usr/local as usual use
```
cmake ..
```
  - otherwise use
```
cmake -DCMAKE_INSTALL_PREFIX=/somewhere/else ..
```
- Afterwards perform
```
make
```
  and
```
make install
```
  as usual
The build steps above as minimum need to be performed for the packages
- ```
mcstas-2.0-src.tar.gz and mcstas-comps-2.0-src.tar.gz
```
For the legacy set of Perl tools you will need to build
- ```
mcstas-tools-perl-2.0-src.tar.gz
```

For the supplementary set of Python tools you will need to build

mcstas-tools-python-mcrun-2.0-src.tar.gz and either
mcstas-tools-python-mcplot-chaco-2.0-src.tar.gz or mcstas-tools-python-mcplot-matplotlib-2.0-src.tar.gz

TIP: The complete set of sources for building McStas 2.0 can be downloaded by the command

svn co https://svn.mccode.org/svn/McCode/tags/mcstas-2.0

instead of downloading the tar.gz's from the download page. Afterwards, use one or more of the

build_...

scripts downloaded to the top level to build your own local version of McStas 2.0.

Should you ever want to build our current development version, check it out from our SVN at https://svn.mccode.org/svn/McCode/trunk and have a look at e.g. build_debs_mcstas in the top level. If you want a non-standard installation-prefix, please do a

export
MCINSTALL_PREFIX=/some/path/somewhere

before running the build_ or mkdist scripts.

February 5th, 2013: Neutrons 2.0 workshop in Berlin

Here is a flyer for an interesting workshop in Berlin this march:

Also available here as a PDF.

January 4th, 2013: Experimental deb and rpm mirrors for McStas

As of today we provide package repositories for deb and rpm package driven Linux systems. To allow automatic update of your mcstas, mcstas-components and tools when new revisions are relased, follow these instructions:

On Debian class systems (including Ubuntu, mint etc.):

cd /etc/apt/sources.list.d
sudo wget http://packages.mccode.org/debian/mccode.list
sudo apt-get update

On RedHat class systems (including Scientific Linux, CentOS etc.):

cd /etc/yum.repos.d
sudo wget http://packages.mccode.org/rpm/mccode.repo
sudo yum update

After following these steps your package manager should now be aware of mcstas (example from Debian)

mcstas@debian:~$ apt-cache search mcstas
mcstas-2.0 - mcstas built using CMake
mcstas-comps-2.0 - mcstas-comps built using CMake
mcstas-suite - A metapackage for McStas + perl and python tools
mcstas-suite-perl - A metapackage for McStas + perl tools
mcstas-suite-python - A metapackage for McStas + python tools
mcstas-tools-2.0 - legacy-tools built using CMake
mcstas-tools-python-mcplot-chaco-2.0 - python-tools-mcplot built using CMake
mcstas-tools-python-mcplot-matplotlib-2.0 - python-tools-mcplot built using CMake
mcstas-tools-python-mcrun-2.0 - python-tools-mcrun built using CMake

The new meta-packages mcstas-suite, mcstas-suite-perl and mcstas-suite-python allows you to install mcstas with one or both sets of tools (mcrun/mcplot etc.) by simple apt-get or yum commands like

Debian:

sudo apt-get install mcstas-suite

RedHat:

sudo yum install mcstas-suite-perl

Please report any trouble with the repositories to mcstas-users@mcstas.org.

Previous news items: 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003,2002, 2001, 2000, 1999, 1998.

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Last Modified: Thursday, 02-May-2013 09:15:02 CEST