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Benchlength at the position of every element
Posted: 30 Jun 2010, 05:12
by CCH
Hello,
Can you tell me how to get the bunchlength as a function of s when I do a tracking?
------------cch
Re: Benchlength at the position of every element
Posted: 30 Jun 2010, 08:19
by michael_borland
If you are tracking for one pass (e.g., a linac, transport line, or a single turn in a ring), you can use the "sigma" output file from &run_setup. The "Ss" column is the bunch length, provided your beam is relativistic. See
http://www.aps.anl.gov/Accelerator_Syst ... ode14.html
If you want the equilibrium bunch length in a ring, use the &moments_output command.
--Michael
Re: Benchlength at the position of every element
Posted: 06 Dec 2012, 12:01
by jpuntree
Hello Michael,
Could you give more details how to get use of the &moments_output command in order to get equilibrium bunchlength as a function of s.
And what will 'Ss' means if I use it in a storage ring tracking?
Many thanks in advanced
Jatuporn
Re: Benchlength at the position of every element
Posted: 07 Dec 2012, 13:15
by michael_borland
Jatuporn,
You can find an examle of using moments_output for a storage ring in the examples file, under PAR/moments. The relevant column in the output file is "s5".
Unless you set up the bunched_beam correctly (with the equilibrium beam properties as the inputs), "Ss" from the &run_setup sigma file probably won't be useful. However, if you set the beam up properly, it should give the same result as "s5" from moments output.
--Michael