B-field calculation

$1 MeV = 1.6\cdot 10^{-13} J = 1.6\cdot 10^{-13} \frac{m^2\cdot kg}{s^2}$

$c = 2.998 \cdot 10^8 \frac{m}{s}$

$p_e = 14 \frac{MeV}{c} = 7.47 \cdot 10^{-21} \frac{m\cdot kg}{s}$

$B = \frac{p_e}{q_e \cdot R}$

$1T=\frac{kg}{C\cdot s}$, $q_e = 1.6\cdot 10^{-19} C$

$B(T) = \frac{4.67\cdot 10^{-2}}{R(m)}$

$180^0 = \kappa + 90^0 + \beta$

$180^0 = \gamma + 90^0+ \beta$

$\kappa = \gamma$

$R = \frac{a}{cos(\beta)} = \frac{a}{cos(90^0 - \kappa)} = \frac{a}{sin(\kappa)}$

$d = R \cdot (1 - cos(\kappa)) = \frac{a \cdot (1 - cos(\kappa))}{sin(\kappa)}$

$B(T) = \frac{4.67\cdot 10^{-2}\cdot sin(\kappa)}{a(m)}$

If $\kappa = 2^0$ then $sin(\kappa) = 0.0348995$ and our B-field becomes:

$B(T) = \frac{0.163\cdot 10^{-2}}{a(m)}$

$a \simeq 0.12 m$ for the coils under consideration. Hence, B-field is:

$B = 1.358 \cdot 10^{-2} T = 0.01358 T = 135.8 G$