Project

General

Profile

Bug #1577

Longitudinal beam generation not working as expected

Added by Rogers, Chris almost 7 years ago. Updated over 6 years ago.

Status:
Rejected
Priority:
Normal
Assignee:
Category:
Simulation
Target version:
Start date:
22 October 2014
Due date:
% Done:

0%

Estimated time:
Workflow:
New Issue

Description

The beam.py longitudinal beam generation in the Twiss model is not doing what I expected. Not sure if I am screwing up the analysis or MAUS is screwing up somewhere.

#1

Updated by Rogers, Chris almost 7 years ago

I made a workaround to add a correlation using "cov(t,p)", "cov(t,pz)" "cov(t,energy)" when in gaussian mode.

#2

Updated by Rogers, Chris almost 7 years ago

I haven't had a chance to look at it. It looks weird. It may be the alpha sign. I note that in longitudinal phase space things are different because faster particles arrive earlier, i.e. with lower t. On the other hand particles with higher px arrive with larger x). I haven't really had a chance to dig into the details. If it is working okay then maybe this is a false alarm...

#3

Updated by Rogers, Chris almost 7 years ago

Looks like I was generating a beam using pz as longitudinal variable, then calculating longitudinal optical functions using energy - which doesn't work if transverse emittance is non-zero

#4

Updated by Rogers, Chris over 6 years ago

  • Status changed from Open to Rejected

Also available in: Atom PDF