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Bug #10615

sbend using chef_mixed extractor_type with Independent_stepper_elements introduces spurious motion

Added by Eric Stern about 4 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Start date:
10/23/2015
Due date:
% Done:

0%

Estimated time:
Duration:

Description

In the attached bad_lattice.lat and run_bad_lattice.py, the particle starting at 0 becomes significantly non-zero when propagated through the sbend. This only happens with the Independent_stepper_elements stepper, not the Independent_stepper. CHEF propagating through the elements doesn't show any spurious motion.

I've changed the default extractor_type to chef_propagate, but we still use chef_mixed for special runs so this shouldn't be forgotten.

bad_lattice.lat (392 Bytes) bad_lattice.lat Eric Stern, 10/23/2015 06:14 AM
run_bad_lattice.py (1.57 KB) run_bad_lattice.py Eric Stern, 10/23/2015 06:14 AM


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