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This commit is contained in:
Cory Balaton 2023-10-07 21:59:37 +02:00
parent a24635ede0
commit 8a2100a334
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GPG Key ID: 3E5FCEBFD80F432B
1 changed files with 17 additions and 24 deletions
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21
src/PenningTrap.cpp
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@ -42,10 +42,7 @@ arma::vec PenningTrap::external_E_field(arma::vec r)
arma::vec PenningTrap::external_B_field(arma::vec r) arma::vec PenningTrap::external_B_field(arma::vec r)
{ {
arma::vec::fixed<3> res; arma::vec::fixed<3> res{0., 0., this->B_0};
res(0) = 0.;
res(1) = 0.;
res(2) = this->B_0;
return res; return res;
} }
@ -53,8 +50,8 @@ arma::vec PenningTrap::external_B_field(arma::vec r)
arma::vec PenningTrap::force_on_particle(int i, int j) arma::vec PenningTrap::force_on_particle(int i, int j)
{ {
// Calculate the difference between the particles' position // Calculate the difference between the particles' position
arma::vec::fixed<3> res = this->particles.at(i).r_vec arma::vec::fixed<3> res =
- this->particles.at(j).r_vec; this->particles.at(i).r_vec - this->particles.at(j).r_vec;
// Get the distance between the particles // Get the distance between the particles
double norm = arma::norm(res); double norm = arma::norm(res);
@ -69,16 +66,13 @@ arma::vec PenningTrap::total_force_external(int i)
{ {
Particle p = this->particles.at(i); Particle p = this->particles.at(i);
arma::vec::fixed<3> v_cross_B;
arma::vec::fixed<3> B = this->external_B_field(p.r_vec); arma::vec::fixed<3> B = this->external_B_field(p.r_vec);
v_cross_B(0) = p.v_vec(1)*B(2) - p.v_vec(2)*B(1); arma::vec::fixed<3> v_cross_B{p.v_vec(1) * B(2) - p.v_vec(2) * B(1),
v_cross_B(1) = p.v_vec(2)*B(0) - p.v_vec(0)*B(2); p.v_vec(2) * B(0) - p.v_vec(0) * B(2),
v_cross_B(2) = p.v_vec(0)*B(1) - p.v_vec(1)*B(0); p.v_vec(0) * B(1) - p.v_vec(1) * B(0)};
arma::vec force = p.q arma::vec force = p.q * (this->external_E_field(p.r_vec) + v_cross_B);
*(this->external_E_field(p.r_vec) + v_cross_B);
return force; return force;
} }
@ -109,7 +103,6 @@ arma::vec PenningTrap::total_force(int i)
void PenningTrap::evolve_RK4(double dt) void PenningTrap::evolve_RK4(double dt)
{ {
} }
void PenningTrap::evolve_forward_euler(double dt) void PenningTrap::evolve_forward_euler(double dt)