The OPAL Discussion Forum

[Andy Rusanov <arusanov AT hadronmedical.com>]

Dear Dr. Adelmann,

thanks a lot for the exhaustive explanation. This makes things clear.

Andy

On Mon, Jun 17, 2013 at 7:03 PM, Andreas Adelmann <andreas.adelmann AT psi.ch> wrote:

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