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- From: Andreas Adelmann <andreas.adelmann AT psi.ch>
- To: Andrii Rusanov <arusanov AT hadronmedical.com>
- Cc: <opal AT lists.psi.ch>
- Subject: Re: [Opal] Beam line, quadrupole definitions (corrections)
- Date: Mon, 17 Jun 2013 13:03:43 +0200
- List-archive: <https://lists.web.psi.ch/pipermail/opal/>
- List-id: The OPAL Discussion Forum <opal.lists.psi.ch>
Hi Andy here a translation between OPAL, MADX and TRANSPORT
for the quadrupole. I will update the manual asap.
Bfieldf = 0.593; // B-field in T
Bfieldd = -0.702;
apperture = 0.125 // m
OPAL
QP1: Quadrupole, L= 0.644, ELEMEDGE= ...., K1= Bfieldf / apperture;
QP2: Quadrupole, L= 0.644, ELEMEDGE= ...., K1= Bfieldd / apperture;
QP3: Quadrupole, L= 0.644, ELEMEDGE= .., K1= Bfieldf / apperture;
MADX
brho = GAMMA*BETA*(PMASS)*1E9/CLIGHT;
kf = Bfieldf / length; // focusing strength [T/m]
kd = Bfieldd / length; // focusing strength [T/m]
vk1 := kf/brho; // focusing strength 1
vk2 := kd/brho; // focusing strength 2
qf: quadrupole, k1:=vk1, l:=0.644; // Quadrupole 1
qd: quadrupole, k1:=vk2, l:=0.644; // Quadrupole 2
TRANSPORT
5. 0.644 5.93 125.0 /QG21/ ;
5. 0.644 -7.02 125.0 /QG22/ ;
5. 0.644 5.93 125.0 /QG23/ ;
Andreas
On Jun 13, 2013, at 5:31 PM, Andrii Rusanov wrote:
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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------
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WBBA/219 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
Friday: ETH CAB H 85.1 +41 44 632 75 22
============================================
The more exotic, the more abstract the knowledge,
the more profound will be its consequences.
Leon Lederman
============================================
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WBBA/219 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
Friday: ETH CAB H 85.1 +41 44 632 75 22
============================================
The more exotic, the more abstract the knowledge,
the more profound will be its consequences.
Leon Lederman
============================================
- [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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