The OPAL Discussion Forum

[Christof Metzger-Kraus <christof.j.kraus AT gmail.com>]

Hi Sébastien,

I've just updated the (online) manual with the following sentences:

OPAL starts at ZSTART and tracks the bunch back in time. It changes the size of the time step
when it crosses the thresholds given in the ZSTOP attribute of the TRACK command and stops 
once it reaches the lowest item of ZSTOP.

Otherwise nothing changes compared to tracking forward in time. I hope that this helps.

Best regards,

Christof

<sebastien.toussaint AT uclouvain.be> schrieb am Di., 28. Juli 2020, 18:41:

Dear all,

Does anyone have complementary informations on how to use the TRACKBACK option
of OPAL-t (the doc is a bit short with respect to this parameter).

Typically, I am running :

RUN, METHOD = "PARALLEL-T", BEAM = Beam1, FIELDSOLVER = FS1, DISTRIBUTION =
Dist,
     MBMODE=force, PARAMB=5.0, TURNS=10, MB_BINNING=GAMMA, MB_ETA=0.01,
TRACKBACK=true;

And amoung the printed messages on the terminal, I get:

OPAL> Track start at: 18:37:31, t= 0.000 [fs]; zstart at: 0.000 [um]
OPAL> Executing ParallelTTracker, initial dt= -1.000 [ps];
OPAL> max integration steps 720000, next step= 0

Best regards,

Sébastien