The OPAL Discussion Forum

["Dr Oznur Apsimon" <omete.phys AT gmail.com>]

Hello,

From the example input files, it seems that we are not able to enter the bunch
charge directly but through beam current which is calculated as

bcurrent = charge*RF_freq

I also tried,

bcurrent  = charge/(sqrt(2*pi) sigma_z)

for a Gaussian single bunch.

However, even an order of magnitude increase in charge does not create a
change in emittance unlike expected. I am trying Nbin to optimise space charge
impact calculation and using different emission models with no success.

Does anyone study low-energy electrons with space charge? Any help will be
appreciated!

Best wishes,
Oznur