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Ensure the ITS ramp-up offset to SOR orbit is multiple of orbitsPerTF #2489

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Merged
sawenzel merged 1 commit into from
Oct 4, 2026
+6 −3
Merged

Ensure the ITS ramp-up offset to SOR orbit is multiple of orbitsPerTF #2489

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9 changes: 6 additions & 3 deletions MC/bin/o2dpg_sim_workflow_anchored.py
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Original file line number Diff line number Diff line change
Expand Up @@ -327,7 +327,7 @@ def milliseconds_to_orbits(milliseconds):
"""
return int(math.ceil(1000. * milliseconds / LHCOrbitMUS))

def shift_anchor_past_ITS_rampup(run_start, first_orbit, ITS_rampup):
def shift_anchor_past_ITS_rampup(run_start, first_orbit, orbitsPerTF, ITS_rampup):
"""
Moves the anchoring point past the ITS ramp-up period, in both of its
coordinates, and returns the pair (start of run in ms, first orbit).
Expand All @@ -336,7 +336,10 @@ def shift_anchor_past_ITS_rampup(run_start, first_orbit, ITS_rampup):
timestamp leaves a job at production offset 0 inside the ramp, where the ITS
time-dead map masks every chip.
"""
return run_start + ITS_rampup, first_orbit + milliseconds_to_orbits(ITS_rampup)
# convert ITS_rampup to orbits multiple to orbitsPerTF
rampupOrbits = ((milliseconds_to_orbits(ITS_rampup) + orbitsPerTF - 1) // orbitsPerTF ) * orbitsPerTF

return run_start + int(rampupOrbits * LHCOrbitMUS / 1000.), first_orbit + rampupOrbits

def retrieve_MinBias_CTPScaler_Rate(raw_rate_at, finaltime, trig_eff_arg, NBunches, ColSystem, eCM, run_number = -1):
"""
Expand Down Expand Up @@ -611,7 +614,7 @@ def main():
# Adjust the anchoring point using the ITS ramp-up period
ITS_rampup = retrieve_ITS_RampDuration(ccdbreader, run_start)
print(f"ITS ramp-up time: {ITS_rampup} ms")
effective_run_start, effective_first_orbit = shift_anchor_past_ITS_rampup(run_start, GLOparams["FirstOrbit"], ITS_rampup)
effective_run_start, effective_first_orbit = shift_anchor_past_ITS_rampup(run_start, GLOparams["FirstOrbit"], GLOparams["OrbitsPerTF"], ITS_rampup)
mid_run_timestamp = (effective_run_start + run_end) // 2

# --------
Expand Down
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