The OPAL Discussion Forum

["frederic.le.pimpec" <frederic.le.pimpec AT psi.ch>]

Hi Chuan,

I re-run the dark current simulation of the RG gun using in the data file
#
NPART      50   # Number of simulation particles in bunch
QBUNCH     0.1     # Bunch charge [pC]

so Normally I should have had after 2 steps the full emission of my 
bunch and then the dark current should start ... and each step should be 
1ps instead of a % of a ps.

As can be seen on the attached figure the emission is constant during 
500 steps.
looking at the emission time it also changes to a ps after step 499

the .o33394 (opal run output)

Boundary geometry initialized
OPAL {0}> MINSTEPFORREBIN 1000
OPAL {0}> REPARTFREQ 500
OPAL {0}> Changing emission time step to: 1.3927e-14
OPAL {0}> * Emit 281 particles at the surfaces
OPAL {0}> Step 0 no emission yet  t= 1.3927e-14 [s]
OPAL {0}> * Emit 281 particles at the surfaces
OPAL {0}> 15.08.52 Step 1 at 0 [m] t= 2.78539e-14 [s] E=4.18961e-08 [MeV]
OPAL {0}> * Wrote beam phase space.
OPAL {0}> * ************** B U N C H 
*********************************************************
OPAL {0}> * NP= 562 Qtot= 0.002832 [nC]  Qi= 2e-15 [C]
OPAL {0}> * spos= 0 [m]
OPAL {0}> * 
********************************************************************************** 

OPAL {0}>
OPAL {0}> * Wrote beam statistics.
OPAL {0}> * Emit 281 particles at the surfaces
OPAL {0}> 15.08.53 Step 2 at 0 [m] t= 4.17809e-14 [s] E=1.04709e-07 [MeV]
OPAL {0}> * Wrote beam phase space.
OPAL {0}> * ************** B U N C H 
*********************************************************
OPAL {0}> * NP= 843 Qtot= 0.004248 [nC]  Qi= 2e-15 [C]
OPAL {0}> * Ekin= 6.98057e-08 [MeV] dEkin= 9.3267e-08 [MeV]
OPAL {0}> * spos= 0 [m]

The first deleted particle appears after  step 597
That is fine.

I think the problem is the REPARTFREQ 500 in the .tmpl file

The question is : what is this REPARTFREQ ?
can I set it up to 2 ? (I will anyway and see what happen)

bests
Frederic