Posts by Jukka Klem

1) Message boards : LHC@home Science : LHC@home Physics Results (Message 12830) Posted 22 Feb 2006 by Jukka Klem Post: The first live beams should start in the second half of next year if everyhting goes well. The is a lot of information about the LHC in the LHC web site. A new big control center has been opened. From there the operators control the LHC beams and the related infrastructure. The big dipole magnets are currently installed in the LHC tunnel. One problem is that there are not enough big trucks to transport the magnets fast enough... Jukka Klem LHC@home team
2) Message boards : LHC@home Science : LHC@home Physics Results (Message 12829) Posted 22 Feb 2006 by Jukka Klem Post: We are in the middle of new beam-beam studies with LHC@home. The effects of strong magnets (triplet magnets) are simulated. These magnets are close to the point where the LHC beams collide and they are very important for reducing the beam size so that there are many proton-proton collisions. The accelerator scientists are also going to study different tune values. Tune is the number of transverse oscillations protons make when they go around the LHC. Many more simulations are planned, but first the scientists wait for the results from earlier simulations and then they take a few days to analyze the results. Jukka Klem LHC@home team
3) Message boards : LHC@home Science : LHC@home Physics Results (Message 12809) Posted 21 Feb 2006 by Jukka Klem Post: LHC@home has delivered some very useful physics results from the recent beam-beam tracking campaign. The accelerator physicists say that these studies were possible only with LHC@home because it gives much more resouces than what they had before. They would not even have imagined making such detailed studies without LHC@home. They could also scan the parameter space more carefully and obtain better results. One presentation about these results is here: Beam-beam results. It contains some accelerator physics jargon, but the plots basically show the area where LHC beam is stable (called dynamic aperture, DA). These results will also be presented in the next particle accelerator conference EPAC'06. Jukka Klem LHC@home team
4) Message boards : Number crunching : Is this the end? (Message 9666) Posted 26 Aug 2005 by Jukka Klem Post: Some good news: more work expected later today..
5) Message boards : Number crunching : BOINC wokshop and LHC magnet articles (Message 9550) Posted 22 Aug 2005 by Jukka Klem Post: There is some information about the 1st Pangalactic BOINC workshop in the CERN bulletin article "Linking computers for science" http://bulletin.cern.ch/eng/earticles.php?bullno=34/2005&base=art#Article3 On the same page there is also an article about the LHC magnets and their production ("One thousand magnets delivered!"). Sixtrack program and LHC@home study how the proton beam behaves when it goes through these magnets! Jukka Klem LHC@home team
6) Message boards : Number crunching : News Update? (Message 7322) Posted 29 Apr 2005 by Jukka Klem Post: The results from recent runs are collected by the sixtrack people (it takes some time before all the results for one study come back). The results obtained look very good and the server is running fine. Thank you for all the contributors! Some more WUs are expected soon. Jukka Klem CERN
7) Message boards : Number crunching : LHC news---- Is there any? (Message 6776) Posted 31 Mar 2005 by Jukka Klem Post: Yes I am from CERN although a rather new member in the LHC@home team. I will bring some news especially about the application and physics side of the project. One of the more experienced LHC@home team members (Chrulle) will soon be back in action. Greetings, Jukka Klem
8) Message boards : Number crunching : LHC news---- Is there any? (Message 6766) Posted 30 Mar 2005 by Jukka Klem Post: The recent work units have been submitted for testing the numerical differencies from different platforms (hopefully there are none left) and zero credit problem. The LHC@home project has recently lacked manpower. A new person will start working for the project in the next few days and we hope to get results much faster. The scientists will have many more jobs to run on LHC@home and we hope that this will happen in a very near future. Jukka Klem CERN
9) Message boards : LHC@home Science : numerical issues resolved? (Message 6467) Posted 7 Mar 2005 by Jukka Klem Post: > Hi, > > I would like to know, if there are still > numerical differences between platforms with > the new libraries used by sixtrack? > > Michael > The numerical problems seem to have been solved with the new libraries but the sixtrack experts keep on looking at the results very carefully.
10) Message boards : LHC@home Science : 8 second workunit (Message 6466) Posted 7 Mar 2005 by Jukka Klem Post: Sometimes the protons are lost from the accelerator very fast depending on magnet configurations (errors in magnets) and initial conditions of the protons (their positions and angles). When a work unit is completed in a short time it shows that protons were not on a stable orbit and this is a very valuable result for the LHC!
11) Message boards : LHC@home Science : How long will we be able to participate in LHC? (Message 6465) Posted 7 Mar 2005 by Jukka Klem Post: > They are supposed to have a grid type of computer up which is similar to > distributed computing, but much more powerful, when LHC opens in 2007. It is > so ambitious, I am skeptical it can come about in two years. I believe BOINC > is theoritically capable of storing information. I cannot predict the future, > but I believe it is possible that as we get closer to 2007 when LHC will open, > they may look to BOINC as a plan B back up if the grid system does not come > off as rapidly as expected. > There are already some working grids that can be used to analyse data coming from LHC. The current grids are not the final answer for LHC computing and many people are still working to improve these grids. Especially handling large amounts of data needs more work. More information: http://gridcafe.web.cern.ch/gridcafe/ http://www.nordugrid.org/ (state of this grid: http://www.nordugrid.org/monitor/loadmon.php) http://lcg.web.cern.ch/LCG/ http://egee-intranet.web.cern.ch/egee-intranet/gateway.html BOINC is now very useful in building the LHC. After LHC has started, there will be more work for BOINC to optimize how the accelerator works. We can also use BOINC to answer new questions (like beam-beam interaction) during LHC operation.
12) Message boards : LHC@home Science : When the LHC is up and running... (Message 6464) Posted 7 Mar 2005 by Jukka Klem Post: Both grid computing and BOINC (LHC@home) are very useful at the LHC. Grid typically has large clusters with hundreds or even thousands of dedicated CPUs to solve problems. More information: http://gridcafe.web.cern.ch/gridcafe/ http://www.nordugrid.org/ (state of this grid: http://www.nordugrid.org/monitor/loadmon.php) http://lcg.web.cern.ch/LCG/ http://egee-intranet.web.cern.ch/egee-intranet/gateway.html

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