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22 changes: 17 additions & 5 deletions src/engines/srpic.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -318,6 +318,7 @@ namespace ntt {
: ZERO;
// cooling
const auto has_synchrotron = (cooling == Cooling::SYNCHROTRON);
const auto has_compton = (cooling == Cooling::COMPTON);
const auto sync_grad = has_synchrotron
? m_params.template get<real_t>(
"algorithms.synchrotron.gamma_rad")
Expand All @@ -328,7 +329,15 @@ namespace ntt {
"scales.omegaB0") /
(SQR(sync_grad) * species.mass())
: ZERO;

const auto comp_grad = has_compton
? m_params.template get<real_t>(
"algorithms.compton.gamma_rad")
: ZERO;
const auto comp_coeff = has_compton
? (real_t)(0.1) * dt *
m_params.template get<real_t>(
"scales.omegaB0") / (SQR(comp_grad) * species.mass())
: ZERO;
// toggle to indicate whether pgen defines the external force
bool has_extforce = false;
if constexpr (traits::has_member<traits::pgen::ext_force_t, pgen_t>::value) {
Expand All @@ -346,6 +355,9 @@ namespace ntt {
if (cooling == Cooling::SYNCHROTRON) {
cooling_tags = kernel::sr::Cooling::Synchrotron;
}
if (cooling == Cooling::COMPTON) {
cooling_tags = kernel::sr::Cooling::Compton;
}
// clang-format off
if (not has_atmosphere and not has_extforce) {
Kokkos::parallel_for(
Expand All @@ -368,7 +380,7 @@ namespace ntt {
domain.mesh.n_active(in::x2),
domain.mesh.n_active(in::x3),
domain.mesh.prtl_bc(),
gca_larmor_max, gca_eovrb_max, sync_coeff
gca_larmor_max, gca_eovrb_max, sync_coeff, comp_coeff
));
} else if (has_atmosphere and not has_extforce) {
const auto force =
Expand Down Expand Up @@ -398,7 +410,7 @@ namespace ntt {
domain.mesh.n_active(in::x2),
domain.mesh.n_active(in::x3),
domain.mesh.prtl_bc(),
gca_larmor_max, gca_eovrb_max, sync_coeff
gca_larmor_max, gca_eovrb_max, sync_coeff, comp_coeff
));
} else if (not has_atmosphere and has_extforce) {
if constexpr (traits::has_member<traits::pgen::ext_force_t, pgen_t>::value) {
Expand Down Expand Up @@ -427,7 +439,7 @@ namespace ntt {
domain.mesh.n_active(in::x2),
domain.mesh.n_active(in::x3),
domain.mesh.prtl_bc(),
gca_larmor_max, gca_eovrb_max, sync_coeff
gca_larmor_max, gca_eovrb_max, sync_coeff, comp_coeff
));
} else {
raise::Error("External force not implemented", HERE);
Expand Down Expand Up @@ -459,7 +471,7 @@ namespace ntt {
domain.mesh.n_active(in::x2),
domain.mesh.n_active(in::x3),
domain.mesh.prtl_bc(),
gca_larmor_max, gca_eovrb_max, sync_coeff
gca_larmor_max, gca_eovrb_max, sync_coeff, comp_coeff
));
} else {
raise::Error("External force not implemented", HERE);
Expand Down
15 changes: 15 additions & 0 deletions src/framework/parameters.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -235,6 +235,13 @@ namespace ntt {
promiseToDefine("algorithms.synchrotron.gamma_rad");
}

if (cooling_enum == Cooling::COMPTON) {
raise::ErrorIf(engine_enum != SimEngine::SRPIC,
"Inverse Compton cooling is only supported for SRPIC",
HERE);
promiseToDefine("algorithms.compton.gamma_rad");
}

species.emplace_back(ParticleSpecies(idx,
label,
mass,
Expand Down Expand Up @@ -916,6 +923,14 @@ namespace ntt {
"gamma_rad",
defaults::synchrotron::gamma_rad));
}
if (isPromised("algorithms.compton.gamma_rad")) {
set("algorithms.compton.gamma_rad",
toml::find_or(toml_data,
"algorithms",
"compton",
"gamma_rad",
defaults::compton::gamma_rad));
}

// @TODO: disabling stats for non-Cartesian
if (coord_enum != Coord::Cart) {
Expand Down
5 changes: 4 additions & 1 deletion src/global/defaults.h
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,10 @@ namespace ntt::defaults {
namespace synchrotron {
const real_t gamma_rad = 1.0;
} // namespace synchrotron


namespace compton{
const real_t gamma_rad = 1.0;
}
} // namespace ntt::defaults

#endif // GLOBAL_DEFAULTS_H
9 changes: 5 additions & 4 deletions src/global/enums.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@
* - enum ntt::FldsBC // periodic, match, fixed, atmosphere,
* custom, horizon, axis, conductor, sync
* - enum ntt::PrtlPusher // boris, vay, photon, none
* - enum ntt::Cooling // synchrotron, none
* - enum ntt::Cooling // compton, synchrotron, none
* - enum ntt::FldsID // e, dive, d, divd, b, h, j,
* a, t, rho, charge, n, nppc, v, custom
* - enum ntt::StatsID // b^2, e^2, exb, j.e, t, rho,
Expand Down Expand Up @@ -265,13 +265,14 @@ namespace ntt {
enum type : uint8_t {
INVALID = 0,
SYNCHROTRON = 1,
NONE = 2,
COMPTON = 2,
NONE = 3,
};

constexpr Cooling(uint8_t c) : enums_hidden::BaseEnum<Cooling> { c } {}

static constexpr type variants[] = { SYNCHROTRON, NONE };
static constexpr const char* lookup[] = { "synchrotron", "none" };
static constexpr type variants[] = { SYNCHROTRON, COMPTON, NONE };
static constexpr const char* lookup[] = { "synchrotron", "compton", "none" };
static constexpr std::size_t total = sizeof(variants) / sizeof(variants[0]);
};

Expand Down
41 changes: 35 additions & 6 deletions src/kernels/particle_pusher_sr.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ namespace kernel::sr {
enum CoolingTags_ {
None = 0,
Synchrotron = 1 << 0,
Compton = 1 << 1,
};
} // namespace Cooling

Expand Down Expand Up @@ -225,8 +226,8 @@ namespace kernel::sr {
bool is_axis_i2min { false }, is_axis_i2max { false };
// gca parameters
const real_t gca_larmor, gca_EovrB_sqr;
// synchrotron cooling parameters
const real_t coeff_sync;
// radiative cooling parameters
const real_t coeff_sync, coeff_comp;

public:
Pusher_kernel(const PrtlPusher::type& pusher,
Expand Down Expand Up @@ -263,7 +264,8 @@ namespace kernel::sr {
const boundaries_t<PrtlBC>& boundaries,
real_t gca_larmor_max,
real_t gca_eovrb_max,
real_t coeff_sync)
real_t coeff_sync,
real_t coeff_comp)
: pusher { pusher }
, GCA { GCA }
, ext_force { ext_force }
Expand Down Expand Up @@ -297,7 +299,8 @@ namespace kernel::sr {
, ni3 { ni3 }
, gca_larmor { gca_larmor_max }
, gca_EovrB_sqr { SQR(gca_eovrb_max) }
, coeff_sync { coeff_sync } {
, coeff_sync { coeff_sync }
, coeff_comp { coeff_comp } {
raise::ErrorIf(boundaries.size() < 1, "boundaries defined incorrectly", HERE);
is_absorb_i1min = (boundaries[0].first == PrtlBC::ATMOSPHERE) ||
(boundaries[0].first == PrtlBC::ABSORB);
Expand Down Expand Up @@ -366,7 +369,8 @@ namespace kernel::sr {
const boundaries_t<PrtlBC>& boundaries,
real_t gca_larmor_max,
real_t gca_eovrb_max,
real_t coeff_sync)
real_t coeff_sync,
real_t coeff_comp)
: Pusher_kernel(pusher,
GCA,
ext_force,
Expand Down Expand Up @@ -401,7 +405,8 @@ namespace kernel::sr {
boundaries,
gca_larmor_max,
gca_eovrb_max,
coeff_sync) {}
coeff_sync,
coeff_comp) {}

Inline void synchrotronDrag(index_t& p,
vec_t<Dim::_3D>& u_prime,
Expand Down Expand Up @@ -454,6 +459,22 @@ namespace kernel::sr {
ux3(p) += coeff_sync * (kappaR[2] - gamma_prime_sqr * u_prime[2] * chiR_sqr);
}

Inline void inverseComptonDrag(index_t& p,
vec_t<Dim::_3D>& u_prime
) const {
real_t gamma_prime_sqr = ONE / math::sqrt(ONE + NORM_SQR(u_prime[0],
u_prime[1],
u_prime[2]));
u_prime[0] *= gamma_prime_sqr;
u_prime[1] *= gamma_prime_sqr;
u_prime[2] *= gamma_prime_sqr;
gamma_prime_sqr = SQR(ONE / gamma_prime_sqr);

ux1(p) -= coeff_comp * gamma_prime_sqr * u_prime[0];
ux2(p) -= coeff_comp * gamma_prime_sqr * u_prime[1];
ux3(p) -= coeff_comp * gamma_prime_sqr * u_prime[2];
}

Inline void operator()(index_t p) const {
if (tag(p) != ParticleTag::alive) {
if (tag(p) != ParticleTag::dead) {
Expand Down Expand Up @@ -558,6 +579,14 @@ namespace kernel::sr {
synchrotronDrag(p, u_prime, ei_Cart_rad, bi_Cart_rad);
}
}
if (cooling & Cooling::Compton) {
if (!is_gca) {
u_prime[0] = HALF * (u_prime[0] + ux1(p));
u_prime[1] = HALF * (u_prime[1] + ux2(p));
u_prime[2] = HALF * (u_prime[2] + ux3(p));
inverseComptonDrag(p, u_prime);
}
}
// update position
posUpd(true, p, xp_Cd);
}
Expand Down