about imposing energy modulation in a bunch

[jcytsai]

Dear Michael,

When trying to generate an energy modulation upon a (given) bunch distribution, I know "smoothDist6s" has an option -energyMod (in %), but, in user manual, it is noted the wavelength is fixed at 1 um. Why can we not adjust the modulation wavelength?

Thanks,
Cheng-Ying

[headdoggy64]

Dear Cheng-Ying,

Please see the example command below

Code: Select all

smoothDist6s -input test.bun -output stest350_0.6.bun -rippleWavelength 0.6 -factor 1 -rippleAmplitude 50 -energyMod 0

Alex.

[jcytsai]

Hi, Alex

It seems like the example command does density modulation (with amplitude 50%, wavelength 0.6 um) instead of energy modulation. (?)

Cheng-Ying

[headdoggy64]

Dear Cheng-Ying,

Yes, you are correct. The parameter -energyMod can specify energy modulation in %. In my example it was set to 0.
Also, -rippleWavelength is the ripple wavelength in microns and -rippleAmplitude is in %. Hope, it helps.

Alex.

[jcytsai]

Dear Alex,

Thanks for your reply. Do you have any idea how to (correctly) impose energy modulation in a bunch? I am still confused by the description "energyMod" in user manual (and why is it fixed at 1 um). Or, can anyone give more hints?

Thanks!
Cheng-Ying