The OPAL Discussion Forum

[Simon Friederich <sifriede AT uni-mainz.de>]

Dear OPAL-Team,

Concerning OPAL-t:

If I understood correctly, the time step at the emission process for the 
DISTRIBUTION can be adjusted using EMISSIONSTEPS.

I was wondering, if the time step can be dynamically adjusted (in a 
similar manner as for emitted distributions), when the bunch passes a 
non-drift element (e.g. magnets, cavities, etc) in order to avoid the 
pitfall you've pointed out in section 4.2. (time step is too big leads 
to an inaccurate calculation of the trajectory).

More concrete: My beam line is roughly 10m, where a lot of drift space 
is necessary. I wanted to use ~50ps for the drifts but ~10ps for the 
other elements, if this was possible.

Thank you very much as always in advance!

Best regards
Simon

P.S.:
The new relative positioning of elements with respect to the first beam 
line they are assigned to (in OPAL 2.4) works like a charm. Thank you 
for this feature!
I also want to thank Achim Gsell for updating the "Compile-OPAL" wiki 
entry. The new remarks helped me compiling OPAL 2.4. much quicker!
However there is one thing I'd suggest, if you're also targeting a 
"not-so-advanced-linux-user"-group (some beginners don't get to use OPAL 
because they are not able to compile it properly I think):
A quick step-by-step tutorial using Ubuntu (as it is one of the mostly 
used distributions). If I'm not mistaken one can then skip some of the 
toolchain modules by using e.g.  "sudo apt-get install build-essential". 
This tutorial should set variables like "${SRC_DIR}" directly (like: 
export SRC_DIR=/home/myusername/opal_src;and maybe skip optional aspects 
like AMG, trilionos, etc. if you think they are not essential to run OPAL).

--
-----------------------------------
Dr. Simon Friederich
Helmholtz-Institut Mainz
Kollaboration B/ACID
Johannes Gutenberg-Universität Mainz
Staudingerweg 18
55128 Mainz, Deutschland

Tel.: +49 (0)6131 39-23160
E-Mail: sifriede AT uni-mainz.de
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