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**From**: Andrii Rusanov <arusanov AT hadronmedical.com>**To**: <opal AT lists.psi.ch>**Subject**: [Opal] Beam line, quadrupole definitions (corrections)**Date**: Thu, 13 Jun 2013 23:31:27 +0800**List-archive**: <https://lists.web.psi.ch/pipermail/opal/>**List-id**: The OPAL Discussion Forum <opal.lists.psi.ch>

For some reason, some browsers do not show Unicode characters from my

post... Here is the TeX version of my question on K1.

Quadrupole chapter of the manual says: K1 is the normal quadrupole

component K1 = \frac{\partial B_y}{\partial B_x}.

Dipole chapter says: K1 defines the field gradient index of the magnet

K1 = (\frac{1}{\Beta\rho})\frac{\partial B_y}{\partial B_x}...

I suppose for the quadrupole, K1 should be also K1 =

(\frac{1}{\Beta\rho})\frac{\partial B_y}{\partial B_x}. And if

OPAL follows MAD9 conventions,a positive K1 implies horizontal

focusing of positively charged particles. Am I right?

Any your comments are very appreciated. Thank you!

Andy Rusanov

**[Opal] Beam line, quadrupole definitions (corrections)**,*Andrii Rusanov, 06/13/2013***Re: [Opal] Beam line, quadrupole definitions (corrections)**,*Andreas Adelmann, 06/17/2013*

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