I have calculated the vertical and horizontal bend angles of the
electrons that orginiate at the origin of the target and move "upstream".
The code used was a version of Robert Lourie's magnet.for improved and
debugged by Oscar Rondon. I checked the code against the calculations
that Heinz Anklin did for Gen98 and they give excellent agreement. The
code is available on request.
Here is the partial output of the code.
Donal Day October 3, 2000.
Track #: 1
Integral B_dl = 36.664 T-cm
angle(v_i,v_f) = 2.703
angle_Bdl = 2.702 degrees
Bdl/v_if = 0.9999
Beam E 2332.000
theta -18.50000 backw.? b
B field theta, phi 90.00000
150.2700 e/recoil e p/d p
theta_q 60.23058 scattering phi 0.0000000E+00
Final E 2332.000
Theta_bend = 2.696243 Phi_bend = -.1869511
Note that these are the angles that an electron leaving the target origin will experience going backwards. Theta_bend is the vertical angle. Positive means that it will get bent up. Phi_bend is the horizontal angle and the negative sign means that this electron will get bent to the right of the beam line as it goes upstream.
Thus for an electron coming into the magnet it will get bent down and
to the right of the beam line. To arrive at the center of the target horizontal
it has to be directed 'up" and to the left of the beam line slightly.
Track #: 1
Integral B_dl = 45.331 T-cm
angle(v_i,v_f) = 2.239
angle_Bdl = 2.238 degrees
Bdl/v_if = 0.9999
Beam E 3481.000
theta -18.00000 backw.? b
B field theta, phi 90.00000
143.6150 e/recoil e p/d p
theta_q 53.13622 scattering phi 0.0000000E+00
Final E 3481.000
Theta_bend = 2.236057 Phi_bend = -.1049956
Note that these are the angles that an electron leaving the target origin will experience going backwards. Theta_bend is the vertical angle. Positive means that it will get bent up. Phi_bend is the horizontal angle and the negative sign means that this electron will get bent to the right of the beam line as it goes upstream.
Thus for an electron coming into the magnet it will get bent down and
to the right of the beam line. To arrive at the center of the target horizontal
it has to be directed 'up" and to the left of the beam line slightly.
Theta_bend is the vertical angle and Phi_bend is the horizontal angle.
Both of these should be multiplied by -1. With these numbers the positions
of the center of the second chicane magnet can be determined.