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No.	： 173
Title	： Difference and usage of "SPAC", "PSPAC" and "WSPAC"?
Date	： 2017/01/25(Wed) 17:55:20
Name	： Renjun Yang <ryang@lal.in2p3.fr>
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As described in the manual, three flags, SPAC, WSPAC and PSPAC, which will take space charge into account when do tracking. In my preliminary understanding, SPAC + SELFCOD could calculate space charge based on a cylindrical symmetry chamber, referring to the current center of beam but not orbit given by emit. Meanwhile, "WSPAC" could consider space charge with assuming Gaussian distribution in the all dimensions, corresponding to number of particles in beam (PBUNCH). As for "PSPAC" use the PIC method to decide space charge ( which should be relative to the number of macro-particles?).

However, I truly confuse of "SPAC" on the space charge is simulated according to the number of particles in beam or number of macro-particles?

Many thanks!

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Difference and usage of "SPAC", "PSPAC" and "WSPAC"?

Renjun Yang

No.173

Re: Difference and usage of "SPAC", "PSPAC" and "WSPAC"? - K. Oide 17/02/01-20:48 No.178
Re: Difference and usage of "SPAC", "PSPAC" and "WSPAC"? - K. Oide 17/02/02-09:24 No.181

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> As described in the manual, three flags, SPAC, WSPAC and PSPAC, which will take space charge into account when do tracking. In my preliminary understanding, SPAC + SELFCOD could calculate space charge based on a cylindrical symmetry chamber, referring to the current center of beam but not orbit given by emit. Meanwhile, "WSPAC" could consider space charge with assuming Gaussian distribution in the all dimensions, corresponding to number of particles in beam (PBUNCH). As for "PSPAC" use the PIC method to decide space charge ( which should be relative to the number of macro-particles?). > > However, I truly confuse of "SPAC" on the space charge is simulated according to the number of particles in beam or number of macro-particles? > > Many thanks!
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Message > As described in the manual, three flags, SPAC, WSPAC and PSPAC, which will take space charge into account when do tracking. In my preliminary understanding, SPAC + SELFCOD could calculate space charge based on a cylindrical symmetry chamber, referring to the current center of beam but not orbit given by emit. Meanwhile, "WSPAC" could consider space charge with assuming Gaussian distribution in the all dimensions, corresponding to number of particles in beam (PBUNCH). As for "PSPAC" use the PIC method to decide space charge ( which should be relative to the number of macro-particles?). > > However, I truly confuse of "SPAC" on the space charge is simulated according to the number of particles in beam or number of macro-particles? > > Many thanks!
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