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Add start and stop index to envelope tracker #133

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Add start and stop index to envelope tracker #133

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15 changes: 11 additions & 4 deletions py/orbit/envelope/track.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@

from orbit.core.bunch import Bunch
from orbit.core.bunch import SyncParticle

from orbit.lattice import AccNode
from orbit.lattice import AccLattice
from orbit.teapot import BendTEAPOT
Expand Down Expand Up @@ -47,12 +48,15 @@ def __init__(self, lattice: AccLattice, sc: str | None = None) -> None:
node.setParam("ea1", 0.0)
node.setParam("ea2", 0.0)

def track(self, envelope: Envelope) -> None:
def track(self, envelope: Envelope, index_start: int = 0, index_stop: int = None) -> None:
"""Track envelope through lattice.

This is not recursive, so grandchild nodes are not tracked.
"""
for node_index, node in enumerate(self.lattice.getNodes()):
nodes = self.lattice.getNodes()
nodes = nodes[index_start : index_stop]

for node_index, node in enumerate(nodes):
for child_node in node.getChildNodes(ENTRANCE):
matrix = get_matrix(child_node, envelope=envelope)
if matrix is not None:
Expand Down Expand Up @@ -91,7 +95,7 @@ def track(self, envelope: Envelope) -> None:
if matrix is not None:
envelope.transform(matrix)

def track_history(self, envelope: Envelope) -> dict[str, list]:
def track_history(self, envelope: Envelope, index_start: int = 0, index_stop: int = None) -> dict[str, list]:
"""Track and return envelope parameters vs. position in lattice."""
history_keys = [
"s",
Expand Down Expand Up @@ -129,7 +133,10 @@ def update_history(envelope: Envelope, position: float) -> None:
path_length = 0.0
update_history(envelope, path_length)

for node_index, node in enumerate(self.lattice.getNodes()):
nodes = self.lattice.getNodes()
nodes = nodes[index_start : index_stop]

for node_index, node in enumerate(nodes):
for child_node in node.getChildNodes(ENTRANCE):
matrix = get_matrix(child_node, envelope=envelope)
if matrix is not None:
Expand Down
20 changes: 20 additions & 0 deletions tests/py/orbit/test_env.py
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Original file line number Diff line number Diff line change
Expand Up @@ -381,3 +381,23 @@ def test_sc_3d_cold_expansion():
# twice the initial size. (See examples from A. Shishlo or
# from the ImpactX repo.)
pass


def test_track_sublattice_no_error():
bunch = Bunch()
bunch.mass(mass_proton)
bunch.getSyncParticle().kinEnergy(0.001)

cov_matrix = np.diag(np.square([1e-3, 0, 1e-3, 0.0, 1e-3, 0.0]))
envelope = Envelope(bunch, cov_matrix=cov_matrix)

lattice = TEAPOT_Lattice()

n = 5
for _ in range(n):
lattice.addNode(DriftTEAPOT(length=0.1))

tracker = EnvelopeTracker(lattice)
for i in range(n):
tracker.track(envelope, index_start=i)
tracker.track(envelope, index_stop=-i)