Lifetime calculation with an ID in the ring

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Samira.kasaei
Posts: 23
Joined: 15 Jun 2021, 13:38

Lifetime calculation with an ID in the ring

Post by Samira.kasaei » 04 Jul 2022, 03:37

Dear Michael,

I wanted to calculate touschek lifetime in the presence of an Id in my ring. While I wanted to calculate momentum aperture I got an error.
Error: No survivor found for initial scan for W0 #1 at s=0.000000e+00m

can you take a look to my files?

Many thanks in advance,
Samira
Attachments
input0.sdds
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optimize.new
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track.ele
(689 Bytes) Downloaded 121 times

michael_borland
Posts: 1796
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: Lifetime calculation with an ID in the ring

Post by michael_borland » 11 Jul 2022, 10:24

Samira,

I found two issues with your setup. First, you set the rf cavity phase using the wrong convention. It should be 180-22 degrees, not 22 degrees, for phase stability. Second, you have ISR=1 on all the KQUAD, KSEXT, and CSBEND elements; this will introduce a random element into the tracking, which you don't want for momentum acceptance searching.

See attached file.

--Michael
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track.ele
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