Search found 13 matches

by jan
07 Apr 2017, 10:53
Forum: Ring Tracking
Topic: radiation damping from tracking
Replies: 3
Views: 4434

Re: radiation damping from tracking

Michael,

thank you very much for your reply. I do not understand why exponential decay of the trajectories leads to your expression. Can you give me a reference for the expression?

Thanks a lot!
Jan
by jan
03 Apr 2017, 03:42
Forum: Ring Tracking
Topic: radiation damping from tracking
Replies: 3
Views: 4434

radiation damping from tracking

Hi everybody, for demonstration of synchrotron radiation effects I tracked a bunch of electrons with large initial energy spread and observed the longitudinal radiation damping. Then I determined the damping time from an exponential fit, but the value is 40-50% smaller than expected. Here is what I ...
by jan
15 Jun 2016, 03:24
Forum: Ring Tracking
Topic: pCentral and average of p
Replies: 2
Views: 4042

Re: pCentral and average of p

Dear Michael, the momentum offset was indeed caused by N_KICKS of CSBEND set to a too small value. Now the deviation is more than one order of magnitude smaller. It was no real effect, because it occurred everywhere around the ring with about the same value. If anybody else wants to check: I calcula...
by jan
14 Jun 2016, 09:42
Forum: Ring Tracking
Topic: pCentral and average of p
Replies: 2
Views: 4042

pCentral and average of p

Hello everybody, I am confused about an observation concerning p and pCentral for an electron bunch tracked in a ring including synchrotron radiation and rf cavities. I looked at the p column of WATCH elements in "coordinate" mode and recognized that its average over all turns is not equal to pCentr...
by jan
09 Feb 2016, 09:56
Forum: General
Topic: libSDDS and threads
Replies: 5
Views: 2766

Re: libSDDS and threads

Here is a very late feedback:
All functions listed in the first post work with threads without problems. I fixed the remaining issue described in the previous post by avoiding SDDS_InitializeInput errors (I check for file existence beforehand).

Thank you very much!
by jan
26 Nov 2015, 05:08
Forum: General
Topic: libSDDS and threads
Replies: 5
Views: 2766

Re: libSDDS and threads

Thank you very much for looking into this. The new version works much better, no SDDS errors! But sometimes (about 1 of 4 runs) the program terminates unexpectedly with "realloc(): invalid next size". I have not identified the causing function, but it could be related to the issue with error values ...
by jan
17 Nov 2015, 07:39
Forum: General
Topic: libSDDS and threads
Replies: 5
Views: 2766

libSDDS and threads

Hi, I am using libSDDS from the SDDSToolKit-devel RPM to read sdds files in c++ applications. It works very good - thanks again for the package. Now I tried to use it in a multi threading application and get various SDDS errors when reading the same file with multiple threads at the same time. Is th...
by jan
29 Oct 2015, 05:15
Forum: Feature Requests
Topic: C++ API
Replies: 9
Views: 17747

Re: C++ API

Thank you very much for the library and the demo.
by jan
27 Oct 2015, 11:15
Forum: Feature Requests
Topic: C++ API
Replies: 9
Views: 17747

Re: C++ API

I am on Ubuntu 15.10 64bit. Thank you.
by jan
27 Oct 2015, 03:06
Forum: Feature Requests
Topic: C++ API
Replies: 9
Views: 17747

Re: C++ API

Thank you for your replies. I would really appreciate SDDS3lib to be finished. The C API Michael mentions is SDDSlib? This would be a good starting point for me. Is there a documentation at least on how to compile it? The Makefiles seem to require a special directory structure and other projects rel...