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Add Linear Compton Scattering #840

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2a363db
Add Linear Compton Scattering
TomGoffrey Aug 7, 2025
bfa3f7d
Unify 1D/2D/3D changes
TomGoffrey Aug 7, 2025
0d0f606
Simplify LCS logic slghtly
TomGoffrey Aug 7, 2025
bacb053
Fox compiler warnings and errors
TomGoffrey Aug 7, 2025
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7 changes: 6 additions & 1 deletion epoch1d/src/constants.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -234,9 +234,14 @@ MODULE constants
REAL(num), PARAMETER :: classical_re = 0.25_num / pi / epsilon0 / m0 &
* (q0 / c)**2
REAL(num), PARAMETER :: sigma_lBW_max = pi * classical_re**2 * &
0.6817055055017870382984600045421994441648264608312_num
0.6817055055017870382984600045421994441648264608312_num
REAL(num), PARAMETER :: sigma_thomson = 8.0_num * pi / 3.0_num &
* classical_re**2
REAL(num), PARAMETER :: inv_c = 1.0_num / c
REAL(num), PARAMETER :: inv_mc0_sq = 1.0_num / mc0 / mc0
REAL(num), PARAMETER :: inv_mc0 = 1.0_num / mc0
REAL(num), PARAMETER :: inv_m0c2 = 1.0_num / m0c2
REAL(num), PARAMETER :: pire2 = pi * classical_re**2
REAL(num), PARAMETER :: half_pire2 = 0.5_num * pi * classical_re**2
REAL(num), PARAMETER :: quarter_pire2 = 0.25_num * pi * classical_re**2
#endif
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20 changes: 16 additions & 4 deletions epoch1d/src/deck/deck_qed_block.F90
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Expand Up @@ -49,6 +49,8 @@ SUBROUTINE qed_deck_initialise
use_LBW = .FALSE.
use_LBW_diff = .TRUE.
LBW_amp_factor = 1.0_num
use_LCS = .FALSE.
use_LCS_diff = .TRUE.
END IF
#endif

Expand Down Expand Up @@ -80,7 +82,7 @@ SUBROUTINE qed_deck_finalise

IF (use_qed) need_random_state = .TRUE.

use_binary_collisions = use_LBW
use_binary_collisions = use_LBW .OR. use_LCS
IF (use_binary_collisions) THEN
DO j = 1, n_species
IF (species_list(j)%species_type == c_species_id_photon) THEN
Expand All @@ -92,10 +94,10 @@ SUBROUTINE qed_deck_finalise
IF (species_list(j)%species_type == c_species_id_positron) THEN
species_list(j)%make_secondary_list = .TRUE.
END IF
END DO
END IF
END DO
END IF

lbw_amp_factor = MAX(lbw_amp_factor, 1.0_num)
lbw_amp_factor = MAX(lbw_amp_factor, 1.0_num)
#else
IF (use_qed) THEN
IF (rank == 0) THEN
Expand Down Expand Up @@ -208,6 +210,16 @@ FUNCTION qed_block_handle_element(element, value) RESULT(errcode)
RETURN
END IF

IF(str_cmp(element, 'linear_compton_scattering')) THEN
use_LCS = as_logical_print(value, element, errcode)
RETURN
END IF

IF(str_cmp(element, 'LCS_differential_cross')) THEN
use_LCS_diff = as_logical_print(value, element, errcode)
RETURN
END IF

errcode = c_err_unknown_element
#endif

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1 change: 0 additions & 1 deletion epoch1d/src/epoch1d.F90
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Expand Up @@ -218,7 +218,6 @@ PROGRAM pic
CALL push_particles

IF (use_particle_lists .OR. use_binary_collisions) THEN

! Check whether this is a step with collisions or collisional ionisation
collision_step = (MODULO(step, coll_n_step) == coll_n_step - 1) &
.AND. use_collisions
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