1. 30 Oct, 2014 1 commit
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  9. 22 Jul, 2014 1 commit
    • adelmann's avatar
      Bring back multipacting simulations. · d78689a9
      adelmann authored
      Need to discuss this:
      
           OPAL> * intersectTinyLineSegmentBoundary:  WARNING: pt=( 0.00017769 , -8.1542e-05 , 0.00086429 )  is outside the bbox  i=-7  j=176  k=0
      
      
      The only boundary geometry MUST be at the first element !
      
      d78689a9
  10. 27 Jun, 2014 1 commit
    • gsell's avatar
      BoundaryGeometry · 30dfa279
      gsell authored
      - bugfix in orienting the triangles: the STL set-intersection doesn't work
        as expected with unordered sets.
      - multi-parted meshes are now supported (but not yet tested)
      - several variables and methods refactored to improve readability.
      30dfa279
  11. 10 Jun, 2014 1 commit
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  30. 21 Jun, 2012 1 commit
  31. 20 Jun, 2012 2 commits
  32. 19 Jun, 2012 1 commit
    • Matthias Toggweiler's avatar
      optimization for AMTS: join two neighboring calls to push(0.5 * h). For... · 17576d0b
      Matthias Toggweiler authored
      optimization for AMTS: join two neighboring calls to push(0.5 * h). For reduced space charge solve frequency, this reduces push timer to almost 50%. This optimization is not applicable for the default algorithm, as the half pushes there are interleaved with step dumping to stdout (even if there is no stat/ps dump). This optimization could be carried over to MTS method in Cyclotron.
      17576d0b
  33. 17 Jun, 2012 1 commit
  34. 16 Jun, 2012 2 commits
    • Matthias Toggweiler's avatar
      make AMTS work with FSTYPE = NONE · d24634a2
      Matthias Toggweiler authored
      d24634a2
    • Matthias Toggweiler's avatar
      AMTS should now support multi-node and multi-bin simulation. Here is a quick usage guide: · f97692f6
      Matthias Toggweiler authored
      To use AMTS integrator in OPAL-T, add the attribute-value pair TIMEINTEGRATOR="AMTS" to the
      TRACK element. Another attribute DTSCINIT on the same element controls the initial time step (in
      seconds) used for space charge. The multiple time stepping scheme uses an outer time step for space
      charge integration, and inner time steps for basic integration. The inner steps are roughly constant
      and equal to the value specified with the DT attribute. The outer step can change freely if space
      charge forces change their magnitude. Example of a TRACK command where a reduced space charge solve
      frequency is used:
      
          track,line=IW2Line, beam=beam1, MAXSTEPS=56000, DTSCINIT=5.0e-10, DT=1.0e-11, ZSTOP=100.0, TIMEINTEGRATOR="AMTS";
      
      AMTS does not (and will probably never) support emission simulation. In such a case, use a short
      track with the default integrator (MAXSTEPS set such that emission is just finished) and use AMTS in
      the follow-up track.
      
      AMTS does not yet support boundary geometry, wake fields, surface physics. This should be possible
      to add without problems, and the only reason it is not supported yet is that it made the initial
      implementation shorter.
      
      As the (outer) time step size is no more constant, some question arises how this is handled. AMTS
      makes a statistics (.stat) and phase space (.h5) dump at the same times when the default integrator
      would have done it. Therefore, AMTS dumps at multiple of times DT * STATDUMPFREQ and DT * PSDUMPFREQ.
      To reach these times exactly, the variable step size is shortened if necessary. Be careful to not
      set the *DUMPFREQ-numbers too low, as this limits the freedom of AMTS' step size choice. AMTS stops
      exactly at time DT * MAXSTEPS, or after ZSTOP has been crossed. Repartitioning happens if the last
      repartitioning is at least DT * REPARTFREQ in the past (here no extra stop is made to
      reach the old repartitioning times exactly).
      
      As said earlier, AMTS can save time in many simulations where a reduced space charge solve frequency
      is still enough precise. For gun simulations, an initial high space charge solve frequency can be
      used, as it is lowered automatically when space charge forces decrease in magnitude.
      
      Later, we can put AMTS into user guide.
      f97692f6
  35. 15 Jun, 2012 1 commit
  36. 13 Jun, 2012 1 commit
    • Matthias Toggweiler's avatar
      AMTS integrator for OPAL-T: · 61c84bfe
      Matthias Toggweiler authored
          - The adaptive multiple time stepping integrator introduces separate time steps for space
            charge and "basic" external field integration.
          - Two kind of simulations will profit from it:
                1) Space charge dominated scenarios, where the space charge forces vary greatly, e.g.
                   gun simulations ("A aspect")
                2) Scenarios where space charge is not dominant, but has a visible effect. Lowering
                   of solver frequency can save considerable amaount of time while staying close to
                   solution with full solve frequency ("MTS aspect")
          - First basic version, not yet tested well
          - Currently works only for single node and single bin
          - Details how to use it will follow
      61c84bfe
  37. 04 Jun, 2012 1 commit