Search found 85 matches

by tennant
30 Aug 2011, 13:29
Forum: General
Topic: Understanding Cx and Cy
Replies: 5
Views: 15736

Understanding Cx and Cy

Hi, When I run a beam with CSR I can see orbit excursions (Cx and Cy) through bunch compressors due to particles losing energy in a dispersion region and then betatron oscillating. When I turn the charge to zero (i.e. no CSR), I still see remnant excursions in Cx and Cy. Granted, they are orders of ...
by tennant
28 Sep 2010, 13:28
Forum: Optimization and Matching
Topic: Fitting Beam Size Measurements
Replies: 9
Views: 12977

Re: Fitting Beam Size Measurements

One more question, I've seen how you can change the Twiss parameters and emittance with the 'twiss' and 'emittance' elements, respectively. Is there a straightforward way to vary the initial longitudinal parameters (i.e. bunch length and energy spread) for fitting purposes?
by tennant
28 Sep 2010, 08:25
Forum: Optimization and Matching
Topic: Fitting Beam Size Measurements
Replies: 9
Views: 12977

Re: Fitting Beam Size Measurements

Ah, yes. Thank you. I also forgot to put the occurrence in (i.e. TV8F06#1.Sx).
by tennant
27 Sep 2010, 13:11
Forum: Optimization and Matching
Topic: Fitting Beam Size Measurements
Replies: 9
Views: 12977

Re: Fitting Beam Size Measurements

Michael, Thanks for the example. I (think) I understand what you are doing, however when I apply it to my file I run into problems. After the optimizer runs, it has not changed any of the twiss parameters or emittances and the value of the fit function is ridiculously high. I don't understand it. I'...
by tennant
20 Sep 2010, 11:42
Forum: Optimization and Matching
Topic: Fitting Beam Size Measurements
Replies: 9
Views: 12977

Re: Fitting Beam Size Measurements

So I grossly overestimated my ability to do what I described in my previous post and now have more fundamental questions. I want to vary the Twiss parameters and emittance at the start of a transport channel to minimize the difference between measured and simulated beam sizes at various locations. P...
by tennant
17 Sep 2010, 11:40
Forum: Optimization and Matching
Topic: Fitting Beam Size Measurements
Replies: 9
Views: 12977

Fitting Beam Size Measurements

Hi, We have (rms) beam size measurements at various points along a transport channel. I'd like to use Elegant to vary the Twiss parameters at the entrance of the the transport channel to minimize the difference between observed and simulated beam sizes. I suppose I could create an optimization_term ...
by tennant
30 Aug 2010, 12:34
Forum: Bugs
Topic: smoothDist6(s)
Replies: 9
Views: 11881

Re: smoothDist6(s)

Okay, so I thought it was working... when I type in the command on cygwin I get the attached message. I also tried passing an input file and setting ripple and amplitude and I get almost the same message. Help please! Thanks.
by tennant
28 Jul 2010, 11:52
Forum: Bugs
Topic: smoothDist6(s)
Replies: 9
Views: 11881

Re: smoothDist6(s)

Thanks, it seems to be working now!
by tennant
28 Jul 2010, 09:05
Forum: Bugs
Topic: smoothDist6(s)
Replies: 9
Views: 11881

Re: smoothDist6(s)

I followed the directions from the previous post you recommended (uninstalled tcltk from cygwin, installed ActiveTcl, etc...) and when I type "smoothDist6s" I get the following error: "couldn't read file "/cygdrive/c/Program Files/APS/Elegant/smoothDist6s": no such file or directory". This seems lik...
by tennant
19 Jul 2010, 17:01
Forum: Bugs
Topic: smoothDist6(s)
Replies: 9
Views: 11881

Re: smoothDist6(s)

Yes, I am using cygwin. I will follow the steps from you previous post that addressed this problem. Thanks.