Lifetime after adding scraper and undulator

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Samira.kasaei
Posts: 37
Joined: 15 Jun 2021, 13:38

Lifetime after adding scraper and undulator

Post by Samira.kasaei » 08 Apr 2026, 05:27

Dear Michael,

I am wondering if Touschek lifetime calculation in Elegant depends on the aperture as I added two scrapers and undulator with 3.5 mm gap but I got almost the same Touschek lifetime (about 60 hours) for the bare lattice.
Here is my files if you can kindly take a look.

Many thanks in advance and best regards,
Samira
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michael_borland
Posts: 2045
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: Lifetime after adding scraper and undulator

Post by michael_borland » 16 Apr 2026, 12:36

Samira,

Yes, apertures will be included in the Touschek lifetime calculations via the local momentum acceptance. However, in your simulation you only added vertical apertures, plus you have no errors. In that case, it isn't surprising that the effect is small because of the lack of coupling of horizontal motion into the vertical plane.

--Michael

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