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[Opal] Beam line, quadrupole definitions (corrections)

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  • From: Andrii Rusanov <arusanov AT>
  • To: <opal AT>
  • Subject: [Opal] Beam line, quadrupole definitions (corrections)
  • Date: Thu, 13 Jun 2013 23:31:27 +0800
  • List-archive: <>
  • List-id: The OPAL Discussion Forum <>

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

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