[SWeinmueller]

The sign for the motion phase is different between signal model and state trekking:
Compare

MRzero-Core/python/MRzeroCore/simulation/main_pass.py

Lines 245 to 248 in 2dca7ac

	rot = torch.exp(-2j * np.pi * (
	(adc_dist_traj[:, 3:] * data.B0) +
	(adc_dist_traj[:, :3] @ data.voxel_pos.T) +
	adc_motion_phase

with

MRzero-Core/python/MRzeroCore/simulation/main_pass.py

Lines 270 to 271 in 2dca7ac

	dist.mag = dist.mag * torch.exp(2j * np.pi * motion_phase[-1, :])
	dist.kt_vec = dist_traj[-1]

[github-actions]

Simulation test: main (before) vs. this PR (after)

Sequence	Status	max mag NRMSE	max phase RMSE	max runtime Δ
mr0_DREAM_STE_seq	✅	0.00e+00	0.00e+00	+8.8%
mr0_DWI_SE_EPI	✅	0.00e+00	0.00e+00	+1.1%
mr0_EPI_2D_seq	✅	0.00e+00	0.00e+00	+2.0%
mr0_FID_seq	✅	0.00e+00	0.00e+00	+2.6%
mr0_FLASH_2D_seq	✅	0.00e+00	0.00e+00	+19.6%
mr0_GRE_to_FLASH	⚠️	–	–	–
mr0_RARE_2D_seq	✅	0.00e+00	0.00e+00	+11.3%
mr0_SE_CPMG_seq	❌	0.00e+00	0.00e+00	+27.4%
mr0_STE_3pulses_5echoes_seq	✅	6.86e-09	1.49e-08	+3.5%
mr0_TSE_2D_multi_shot_seq	✅	0.00e+00	0.00e+00	+0.6%
mr0_bSSFP_2D_seq	✅	0.00e+00	0.00e+00	+9.1%
mr0_diffusion_prep_STEAM_2D_seq	✅	0.00e+00	0.00e+00	+8.4%

✅ mr0_DREAM_STE_seq: All tests passed.

✅ mr0_DWI_SE_EPI: All tests passed.

✅ mr0_EPI_2D_seq: All tests passed.

✅ mr0_FID_seq: All tests passed.

✅ mr0_FLASH_2D_seq: All tests passed.

⚠️ mr0_GRE_to_FLASH: No comparison possible: [Errno 2] No such file or directory: '/home/runner/work/MRzero-Core/MRzero-Core/tests/simulation_test/ref_files/mr0_GRE_to_FLASH.seq.npz'

✅ mr0_RARE_2D_seq: All tests passed.

❌ mr0_SE_CPMG_seq: Runtime deviation too high (27.37%) at acc=0.01000

✅ mr0_STE_3pulses_5echoes_seq: All tests passed.

✅ mr0_TSE_2D_multi_shot_seq: All tests passed.

✅ mr0_bSSFP_2D_seq: All tests passed.

✅ mr0_diffusion_prep_STEAM_2D_seq: All tests passed.

Workflow run — raw .npz data is attached as artifacts.