SIXTRACK is a research project that uses Internet-connected computers to advance Accelerator Physics. Participate by downloading and running a free program on your computer.

SIXTRACK is based at CERN. You can run it under the LHC@home application. Read more about the:

Join Sixtrack

  • Read our rules and policies
  • This project uses BOINC. If you're already running BOINC, select Add Project. If not, download BOINC.
  • When prompted, select LHC@home from the list of projects, or simply enter:
  • If you're running a command-line version of BOINC, create an account first.
  • If you have any problems, get help here.


Useful links

User of the day

User profile Profile Sebastian Czan
I'm a guy working in the area of Land Surveying, living in Canada. I've had an interest in astronomy and physics since I was young, and studied both...


VM applications broken by the Windows 10 update KB3206632
The Windows 10 update KB3206632 introduces an issue that affects virtualization-based security (VBS) and hence may break VM applications. The issue is fixed in the update KB3213522. If you are running Windows 10, please ensure that you have applied the KB3213522 update.

Thanks everyone who contributed the treads on this issue.

Missing heartbeat file errors
Microsoft KB3206632 from 16/12/15
8 Jan 2017, 20:51:44 UTC · Comment

Season's Greetings
A very Merry Christmas and a Happy New Year to all the LHC@home supporters.
(I shall send some news about our plans for 2017 in the next few days.)
25 Dec 2016, 8:33:19 UTC · Comment

VM applications
Following the Theory simulations added 1 week ago, we have now also deployed the CMS and LHCb applications from the Virtual LHC@home project here on the consolidated, original LHC@home.

Please note that in order to run VM applications in addition to the classic BOINC application Sixtrack, you need to have a 64bit machine with VirtualBox installed and virtualisation extensions (VT-x) enabled. The details are explained on the join us and faq pages on the LHC@home web site.

By default, only the Sixtrack application is enabled in your BOINC project preferences. If you have VirtualBox installed and wish to try VM applications as well, you need to enable other applications in your LHC@home project preferences.

Please note that if you run an older PC with Windows XP or similar, it is recommended to stay with the default; Sixtrack only.

Thanks for your contributions to LHC@home!

--The team
21 Nov 2016, 10:05:13 UTC · Comment

LHC@home consolidation
As part of consolidation of LHC@home, we have setup a new server web front end using SSL for this project. The new URL is:

Please feel free to connect to the new site at your convenience. (BOINC 7.2 clients and later supports SSL.)

The old LHC@home classic site will continue operation as long as required. Currently there are no new Sixtrack tasks in the queue, but soon more applications and work will be available from this project.
6 Oct 2016, 10:56:02 UTC · Comment

LHC@Home - SixTrack Project News
The members of the SixTrack project from LHC@Home would like to thank all the volunteers who made their CPUs available to us! Your contribution is precious, as in our studies we need to scan a rather large parameter space in order to find the best working points for our machines, and this would be hard to do without the computing power you all offer to us!

Since 2012 we have started performing measurements with beam dedicated to probing what we call the “dynamic aperture” (DA). This is the region in phase space where particles can move without experiencing a large increase of the amplitude of their motion. For large machines like the LHC this is an essential parameter for granting beam stability and allowing long data taking at the giant LHC detectors. The measurements will be benchmarked against numerical simulations, and this is the point where you play an important role! Currently we are finalising a first simulation campaign and we are in the process of writing up the results in a final document. As a next step we are going to analyse the second half of the measured data, for which a new tracking campaign will be needed. …so, stay tuned!

Magnets are the main components of an accelerator, and non-linearities in their fields have direct impact on the beam dynamics. The studies we are carrying out with your help are focussed not only on the current operation of the LHC but also on its upgrade, i.e. the High Luminosity LHC (HL-LHC). The design of the new components of the machine is at its final steps, and it is essential to make sure that the quality of the magnetic fields of the newly built components allow to reach the highly demanding goals of the project. Two aspects are mostly relevant:

    specifications for field quality of the new magnets. The criterion to assess whether the magnets’ filed quality is acceptable is based on the computation of the DA, which should larger than a pre-defined lower bound. The various magnet classes are included in the simulations one by one and the impact on DA is evaluated and the expected field quality is varied until the acceptance criterion of the DA is met.

    dynamic aperture under various optics conditions, analysis of non-linear correction system, and optics optimisation are essential steps to determine the field quality goals for the magnet designers, as well as evaluate and optimise the beam performance.

The studies involve accelerator physicists from both CERN and SLAC.

Long story made short, the tracking simulations we perform require significant computer resources, and BOINC is very helpful in carrying out the studies. Thanks a lot for your help!
The SixTrack team

Latest papers:

R. de Maria, M. Giovannozzi, E. McIntosh (CERN), Y. Cai, Y. Nosochkov, M-H. Wang (SLAC), DYNAMIC APERTURE STUDIES FOR THE LHC HIGH LUMINOSITY LATTICE, Presented at IPAC 2015.

Latest talks:

Y. Nosochkov, Dynamic Aperture and Field Quality, DOE review of LARP, FNAL, USA, July 2016
Y. Nosochkov , Field Quality and Dynamic Aperture Optimization, LARP HiLumi LHC collaboration meeting, SLAC, USA, May 2016
M. Giovannozzi, Field quality update and recent tracking results, HiLumi LHC LARP annual meeting, CERN, October 2015
Y. Nosochkov, Dynamic Aperture for the Operational Scenario Before Collision, LARP HiLumi LHC collaboration meeting, FNAL, USA, May 2015 26 Jul 2016, 8:37:55 UTC · Comment

... more

News is available as an RSS feed   RSS