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Alessio Mereghetti
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Message 27782 - Posted: 26 Jul 2016, 8:37:55 UTC
Last modified: 26 Jul 2016, 8:43:35 UTC

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.
Y. Nosochkov, Y. Cai, M-H. Wang (SLAC), S. Fartoukh, M. Giovannozzi, R. de Maria, E. McIntosh (CERN), SPECIFICATION OF FIELD QUALITY IN THE INTERACTION REGION MAGNETS OF THE HIGH LUMINOSITY LHC BASED ON DYNAMIC APERTURE, Presented at IPAC 2014

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

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Message 27783 - Posted: 28 Jul 2016, 7:11:14 UTC

You're welcome

Since 2004 and still running Cern tasks 24/7 365
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Message 27784 - Posted: 28 Jul 2016, 14:27:23 UTC - in response to Message 27782.
Last modified: 28 Jul 2016, 14:27:43 UTC

Alessio Mereghetti wrote:
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!

Thank you, Alessio. It's always nice to get feedback like this. The LHC projects are among my favorites and I'm always looking for work here. Keep up the good work.

Cheers,

MarkR

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Message 27806 - Posted: 6 Sep 2016, 15:02:47 UTC - in response to Message 27783.

I really wish I could help, and I had done so for a couple of years. But no work has been downloaded to my machine for months. I am able to run setiathome with no problems. What can I do to grab some lhc tasks?

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Message 27807 - Posted: 6 Sep 2016, 16:27:31 UTC - in response to Message 27806.

I really wish I could help, and I had done so for a couple of years. But no work has been downloaded to my machine for months. I am able to run setiathome with no problems. What can I do to grab some lhc tasks?

Unfortunately, this project doesn't have work available all the time. If you follow the "Server Status" link at the top left under "Participants", you'll see that there's not much work at the moment. When I want to run this project, I just leave it set for "allow new work" and, eventually, some tasks will come in.

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Message 27808 - Posted: 8 Sep 2016, 11:03:31 UTC - in response to Message 27807.

YES it has always been that way here and this was my first Boinc project way back in 2004.

I remember being on here all the time the first year making sure if there were new tasks that I would get them.

Only problem back then is they would stay *pending* for a few years.

I just stopped by to check for any work and the server said it had some but just my luck there is actually nothing.

The good thing is if Cern is what you like we have plenty of other projects.

I run all of those too and they have work non-stop.
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Message 27811 - Posted: 12 Sep 2016, 8:16:47 UTC - in response to Message 27808.

YES it has always been that way here and this was my first Boinc project way back in 2004.
[...]
The good thing is if Cern is what you like we have plenty of other projects.
I run all of those too and they have work non-stop.


A characteristic peculiar to the SixTrack project is that the studies are devoted to simulate the behaviour of accelerated beams, for improving the performance of existing machines (e.g. the LHC) or the design of future ones (e.g. FCC). SixTrack WUs are not the analysis of experimental data sets regularly produced, but follow the investigations involved in the optimisation process. Thus, it happens that, e.g., yesterday we needed a large parameter scan to get the answers we needed, today the parameter space is smaller, and maybe tomorrow it will become massive...

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Message 27862 - Posted: 16 Nov 2016, 11:49:43 UTC - in response to Message 27811.

Well Alessio, if these new VB tasks work here like they seem to be maybe that will keep us busy here too.

-Samson
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