opal AT lists.psi.ch
Subject: The OPAL Discussion Forum
List archive
- From: "Dragos Constantin" <dragos.constantin AT varian.com>
- To: opal AT lists.psi.ch
- Subject: [Opal] charge per macroparticle for long emission times
Dear colleagues,
I am using the AWAGun-1 as a toy model. In there I have modified the emission
time to be several times longer than 1/f0 to mimic a non-pulsed cathode. As a
consequence the bunching is performed by the RF-field.
Regarding current and charge, normally one will specify the charge/bunch for
really short bunches and multiply that with f0 to get the current. In that
situation the bunch is no longer than 1/f0, i.e. it is spatially contained in
one RF period..
When the emission time is longer than 1/f0, how is the beam current, the
number of macroparticles, and their associated charge related? Normally one
would do
macroparticle_charge = (beam_current * emission_time) /
number_of_macroparticles
but I suspect 1/fo is involved (because BFREQ=f0 in the BEAM command), and I
will have to scale the beam current to have the correct charge/macroparticle.
Conversely, to eliminate f0 from the equation, should I specify the following
options
BUNCHED=False
BFREQ=1/emission_time
in the BEAM command?
What is the correct and consistent way of dealing with this issue?
Thanks,
Dragos
- [Opal] charge per macroparticle for long emission times, Dragos Constantin, 07/28/2020
- Re: [Opal] charge per macroparticle for long emission times, Adelmann Andreas (PSI), 07/28/2020
Archive powered by MHonArc 2.6.19.