Kicker vs Quad Kicks

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tennant
Posts: 85
Joined: 31 Jul 2008, 07:19
Location: Jefferson Laboratory

Kicker vs Quad Kicks

Post by tennant » 10 Apr 2015, 13:14

Hi,

I wanted to simulate transverse kicks along a beamline. I did it two different ways: (1) using a kicker element placed between two halves of a quadrupole and (2) using the h/vkick parameter of the quadrupole itself. Using the same transverse kick for each, I find different results (i.e. sddsplot -col=s,Cx -graph=lines,vary -split=page *.cen). I've attached example files.

I greatly appreciate any help resolving the discrepancy, or correcting my (mis)understanding.
Thanks,
chris
Attachments
test.lte
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test.ele
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both.sdds
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michael_borland
Posts: 1927
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: Kicker vs Quad Kicks

Post by michael_borland » 14 Apr 2015, 08:16

Chris,

I have a little trouble understanding your example, but I did a simple test and things work as expected. One point to realize (which is not stated in the manual), is that the kicks are applied at the entrance and exit of the magnet. I.e., the sequence is

Code: Select all

HKICK/2, VKICK/2, QUAD, HKICK/2, VKICK/2
Hence, you might see some slight differences from

Code: Select all

QUAD/2, HKICK, VKICK, QUAD/2
Hope this helps.

--Michael

tennant
Posts: 85
Joined: 31 Jul 2008, 07:19
Location: Jefferson Laboratory

Re: Kicker vs Quad Kicks

Post by tennant » 14 Apr 2015, 08:24

Thank you for the clarification. I was under the impression the kick happened once at the center of the magnet. This makes it clear.

Thank you Michael!

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