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feat(mixing): add OneBB1500W preset and 1BB1500W beam constants #565

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oksuzian merged 2 commits into from
Aug 11, 2026
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feat(mixing): add OneBB1500W preset and 1BB1500W beam constants #565

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feat(mixing): add OneBB1500W intensity preset
oksuzian Aug 10, 2026
947cccd
feat(ensemble): add 1BB1500W beam constants
oksuzian Aug 10, 2026
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21 changes: 21 additions & 0 deletions JobConfig/ensemble/python/constants.py
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Expand Up @@ -34,3 +34,24 @@
TWOBB_POT_PER_CYCLE=8e12 # protons per 1.4 s cycle in two-bunch mode
ONEBB_CYCLE = 1.33 # seconds per cycle in one-bunch mode
TWOBB_CYCLE = 1.4 # seconds per cycle in two-bunch mode

# One booster batch at a reduced intensity of 1500 W, as used by the
# Run1B campaigns. Matches JobConfig/mixing/OneBB1500W.fcl. Same
# accelerator mode as 1BB, so it takes ONEBB_DF and ONEBB_CYCLE; only
# the intensity differs.
#
# Protons per spill follow from POT per cycle divided by the number of
# 1695 ns spills that fit in the onspill fraction of a cycle:
#
# mode | power | POT/cycle / (DF x cycle / SPILL) = protons/spill
# ---------|----------|--------------------------------------|--------------
# 1BB1500W | 1.500 kW | 1.556e12 / (0.323 x 1.33 / 1.695e-6) = 6.141e6
# 1BB | 3.855 kW | 4e12 / (0.323 x 1.33 / 1.695e-6) = 1.578e7
# 2BB | 7.324 kW | 8e12 / (0.246 x 1.40 / 1.695e-6) = 3.937e7
#
# Power is POT_PER_CYCLE * 8 GeV / CYCLE, so it depends on the cycle
# time, not on the duty factor. Note 2BB delivers double the protons in
# a shorter spill (0.344 s against 0.430 s), which is why 1BB and 2BB
# are not a factor of two apart in protons per spill.
ONEBB1500W_POT_PER_CYCLE = 1.556e12 # protons per 1.33 s cycle at 1500 W
ONEBB1500W_PROTONS_PER_SPILL = 6.14e6 # protons per 1695 ns spill at 1500 W
11 changes: 11 additions & 0 deletions JobConfig/mixing/OneBB1500W.fcl
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@@ -0,0 +1,11 @@
#
# One booster batch at reduced intensity: 1500 W.
#
# 1.5565e12 POT per 1.33 s cycle, which is 0.389 of a full 4e12 batch,
# spread over the 253445 microbunches of the 0.4296 s spill (1BB duty
# factor 0.323). Accelerator parameters are those in
# JobConfig/ensemble/python/constants.py.
#
#include "Production/JobConfig/mixing/OneBB.fcl"
physics.producers.PBISim.extendedMean: 6.14e6 # 1500 W
physics.producers.PBISim.cutMax: 36.8e6 # truncate the tail at 6 times the mean