Elegant users forum

Posted: **12 Nov 2024, 03:38**

Hello,

I am using Elegant for longitudinal jitter simulations. The &error_element command is used to add RF phase and cavity voltage errors. I have 1001 injection beam files (inj_0001.sdds to inj_1001.sdds) from the injector's simulation results. I want to simulate injection beam errors by randomly selecting an injection beam file in each step of the calculation. Assume n_steps=101 in run_control, how to randomly select one injection beam file from 1001 injection beam files at each step of the computation? Can input_list &sdds_beam in work? If it works, how to proceed?

Many thanks for any suggestion,
Zhenbiao

Posted: **12 Nov 2024, 17:30**

Zhenbiao,

I would combine the input beam files and randomize their order, as follows

Code: Select all

sddscombine inj_????.sdds -pipe=out \
| sddsprocess -pipe -define=parameter,sortOrder,rnd \
| sddssort -pipe=in randomizedBeams.sdds -parameter=sortOrder

This assigns a random number to each page of the combined file, then sorts by that random number.

In elegant, you then use

Code: Select all

&sdds_beam
	input = randomizedBeams.sdds,
	track_pages_separately = 1
&end

--Michael

Posted: **12 Nov 2024, 21:00**

Dear Michael,

Many thanks for your quick reply. It works well.

Best regards,
Zhenbiao

Elegant users forum

How to randomly select one injection beam file from 1001 injection beam files

How to randomly select one injection beam file from 1001 injection beam files

Re: How to randomly select one injection beam file from 1001 injection beam files

Re: How to randomly select one injection beam file from 1001 injection beam files