From cf5b723e5d2913cd43b8aae77c2cfcbcfeff2d10 Mon Sep 17 00:00:00 2001 From: mattsignorelli <113714234+mattsignorelli@users.noreply.github.com> Date: Tue, 13 Aug 2024 02:04:39 -0400 Subject: [PATCH] correct map tracking symplectic note (#1136) --- bsim/long_term_tracking/doc/long_term_tracking.tex | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/bsim/long_term_tracking/doc/long_term_tracking.tex b/bsim/long_term_tracking/doc/long_term_tracking.tex index cd2ad6b2c1..0fe475f502 100644 --- a/bsim/long_term_tracking/doc/long_term_tracking.tex +++ b/bsim/long_term_tracking/doc/long_term_tracking.tex @@ -390,11 +390,12 @@ In terms of speed, using maps will be the fastest, using standard Bmad tracking will be much slower, and using PTC element-by-element tracking will be slowest. -In terms of symplecticity, both the PTC tracking and map tracking will be symplectic. -Bmad is not symplectic but the deviation from symplecticity is generally fairly small. If the -radiation effects are large enough, the radiative stochastic noise will negate any non-symplectic -effects and standard Bmad tracking can be used. A very rough rule of thumb is that if the damping times -or the number of turns tracked are under 100,000 turns then Bmad standard tracking can be used. +In terms of symplecticity, PTC tracking is symplectic, and map tracking is symplectic if +\vn{ltt%symplectic_map_tracking} is set to True. Bmad tracking is not symplectic but the deviation from +symplecticity is generally fairly small. If the radiation effects are large enough, the radiative +stochastic noise will negate any non-symplectic effects and standard Bmad tracking can be used. +A very rough rule of thumb is that if the damping times or the number of turns tracked are under +100,000 turns then Bmad standard tracking can be used. PTC element-by-element tracking cannot be done when using the MPI version of the \ltt program.