Overlapping bunch
Posted: 24 Aug 2010, 17:20
Hi Michael and Co.,
I have an unusual situation. I am trying to apply the transverse and longitudinal (&insert_sceffects
and LSCDRIFT) space charge forces in the UMER ring (11.52 m circumference, 10 keV electron energy).
The longitudinal debunching (no rf) due to the space charge is so strong that at a certain turn some tail particles lag the head
by a length longer than the circumference. What happens at this point ? Does the space charge algorithm recognizes
the one turn overlap ? The program continues to run for a turn or so even after the
separation between the head and tail is somewhat longer than the circumference, after which all particles are lost. I wonder whether the loss is due to physics or to a problem in the algorithm when particles overlap.
Thanks, Max
I have an unusual situation. I am trying to apply the transverse and longitudinal (&insert_sceffects
and LSCDRIFT) space charge forces in the UMER ring (11.52 m circumference, 10 keV electron energy).
The longitudinal debunching (no rf) due to the space charge is so strong that at a certain turn some tail particles lag the head
by a length longer than the circumference. What happens at this point ? Does the space charge algorithm recognizes
the one turn overlap ? The program continues to run for a turn or so even after the
separation between the head and tail is somewhat longer than the circumference, after which all particles are lost. I wonder whether the loss is due to physics or to a problem in the algorithm when particles overlap.
Thanks, Max