BLonD code development meeting

Europe/Zurich
864/1-B04 (CERN)

864/1-B04

CERN

40
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General new:

  • Helga: docs require updates, example will be shown next time
  • Markus: was working on unittests for LLRF
  • Other unittests still missing
  • Kostis: np.deepcopy() fails in the bunch generation in python3.6 but not in python3.5 -> dreadlock cannot be copied
    • Change the code?
    • Do to miniconda vs anaconda?
  • Kostis: check packaging with Jelena
  • Installation guide: just write requirements

Markus: Correctly simulating with the SPS impedance model

  • Use fast sine or interp_kick() with the impedance model?
  • Summary of objects inside the impedance model, minimum BW required
  • Run times for single bunches...
  • Alex: extending Juan's test for induced voltage convergence? He had a test for a single resonator
  • Comparison of interpolated/continuous kick: squared difference of time coordinates
    • Run time is 30-50 % larger for continuous kick

Kostis: Distributed BLonD

  • Master-worker model
  • Initialisations on Master process, create workers
  • Main loop iterations are done with all workers; master broadcasts
    • Only exchange bunch profile information, but coordinates are distributed over different workers
    • Minimise exchange of information
    • Workers don't have to communicate with each other but just with the Master when the histogram is reduced
  • First tests with EX_01_Acceleration.py
  • CERN cluster for distributed applications -> BE dept.
  • First results OMP vs MPI on 1 or 2 nodes
  • Next steps: minimise the amount of communication; workflow is fixed -> predefine sequence

Simon: Frequency offset

  • For PSB and LEIR injection with a frequency offset w.r.t. design
There are minutes attached to this event. Show them.
    • 10:00 10:30
      General Info 30m
      Speakers: Aaron Farricker (CERN), Alexandre Lasheen (CERN), Danilo Quartullo (Sapienza Universita e INFN, Roma I (IT)), Giulia Papotti (CERN), Helga Timko (CERN), Ivan Karpov (CERN), Joel Repond (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Mr Konstantinos Iliakis (CERN), Markus Schwarz (CERN), Simon Albright (CERN), Theodoros Argyropoulos (Instituto de Fisica Corpuscular IFIC (ES))
    • 10:30 11:00
      Newest code release 30m
      Speakers: Aaron Farricker (CERN), Alexandre Lasheen (CERN), Danilo Quartullo (Sapienza Universita e INFN, Roma I (IT)), Giulia Papotti (CERN), Helga Timko (CERN), Ivan Karpov (CERN), Joel Repond (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Mr Konstantinos Iliakis (CERN), Markus Schwarz (CERN), Simon Albright (CERN), Theodoros Argyropoulos (Instituto de Fisica Corpuscular IFIC (ES))
    • 11:00 11:30
      Status report 30m
      Speaker: Mr Konstantinos Iliakis (CERN)