ltt%split_bends_for_stochastic_rad = T gives different emittance when ramping compared to ltt%split_bends_for_stochastic_rad = F

bmad-sim / bmad-ecosystem

Bmad simulation ecosystem for simulating high energy storage rings.

https://www.classe.cornell.edu/bmad/

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ltt%split_bends_for_stochastic_rad = T gives different emittance when ramping compared to ltt%split_bends_for_stochastic_rad = F #1040

Closed henrylovelace3 closed 1 week ago

henrylovelace3 commented 1 week ago

ramp_example.zip

DavidSagan commented 1 week ago

@henrylovelace3 Is the emittance different when not ramping and just using the lattice at the end of the ramp?

henrylovelace3 commented 1 week ago

Slightly, the equilibrium emittance hovers around 25 nm. The natural emittance is 21 nm.

DavidSagan commented 1 week ago

Problem is that split_bends_for_stochastic_rad = T was never meant to be used with ramping. I will put in checking to prevent this from happening. The checking will be in the next release.