scipp · nvaytet · Feb 13, 2026 · Feb 2, 2026 · Feb 2, 2026 · Feb 2, 2026
diff --git a/docs/user-guide/dream/dream-make-tof-lookup-table.ipynb b/docs/user-guide/dream/dream-make-tof-lookup-table.ipynb
@@ -48,6 +48,8 @@
    "id": "4",
    "metadata": {},
    "source": [
+    "Note that possible configurations are `high_flux`, `high_flux_BC215`, `high_flux_BC240`, and `high_resolution`.\n",
+    "\n",
     "## Setting up the workflow"
    ]
   },
@@ -60,13 +62,12 @@
    "source": [
     "wf = time_of_flight.TofLookupTableWorkflow()\n",
     "\n",
-    "wf[time_of_flight.LtotalRange] = sc.scalar(60.0, unit=\"m\"), sc.scalar(80.0, unit=\"m\")\n",
+    "wf[time_of_flight.LtotalRange] = sc.scalar(5.0, unit=\"m\"), sc.scalar(80.0, unit=\"m\")\n",
     "wf[time_of_flight.NumberOfSimulatedNeutrons] = 200_000  # Increase this number for more reliable results\n",
     "wf[time_of_flight.SourcePosition] = sc.vector([0, 0, 0], unit='m')\n",
     "wf[time_of_flight.DiskChoppers[AnyRun]] = disk_choppers\n",
     "wf[time_of_flight.DistanceResolution] = sc.scalar(0.1, unit=\"m\")\n",
     "wf[time_of_flight.TimeResolution] = sc.scalar(250.0, unit='us')\n",
-    "wf[time_of_flight.LookupTableRelativeErrorThreshold] = 0.02\n",
     "wf[time_of_flight.PulsePeriod] = 1.0 / sc.scalar(14.0, unit=\"Hz\")\n",
     "wf[time_of_flight.PulseStride] = 1\n",
     "wf[time_of_flight.PulseStrideOffset] = None"
@@ -88,7 +89,7 @@
    "outputs": [],
    "source": [
     "table = wf.compute(time_of_flight.TimeOfFlightLookupTable)\n",
-    "table"
+    "table.array"
    ]
   },
   {
@@ -116,7 +117,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "table.save_hdf5('DREAM-high-flux-tof-lookup-table.h5')"
+    "table.save_hdf5('DREAM-high-flux-tof-lut-5m-80m.h5')"
    ]
   }
  ],
@@ -135,7 +136,8 @@
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3"
+   "pygments_lexer": "ipython3",
+   "version": "3.12.12"
   }
  },
  "nbformat": 4,

diff --git a/pyproject.toml b/pyproject.toml
@@ -31,7 +31,7 @@ requires-python = ">=3.11"
 # Make sure to list one dependency per line.
 dependencies = [
   "dask>=2022.1.0",
-  "essreduce>=25.12.1",
+  "essreduce>=26.2.1",
   "graphviz",
   "numpy>=2",
   "plopp>=26.2.0",

diff --git a/requirements/base.in b/requirements/base.in
@@ -3,7 +3,7 @@
 # --- END OF CUSTOM SECTION ---
 # The following was generated by 'tox -e deps', DO NOT EDIT MANUALLY!
 dask>=2022.1.0
-essreduce>=25.12.1
+essreduce>=26.2.1
 graphviz
 numpy>=2
 plopp>=26.2.0

diff --git a/requirements/base.txt b/requirements/base.txt
@@ -1,4 +1,4 @@
-# SHA1:303c70637d6536773db66ff40b4306cd86aee2c0
+# SHA1:e8dc8a7c4338f6f02931f7cf0dd2408d0d0351db
 #
 # This file was generated by pip-compile-multi.
 # To update, run:
@@ -35,13 +35,13 @@ dnspython==2.8.0
     # via email-validator
 email-validator==2.3.0
     # via scippneutron
-essreduce==26.2.0
+essreduce==26.2.1
     # via -r base.in
 executing==2.2.1
     # via stack-data
 fonttools==4.61.1
     # via matplotlib
-fsspec==2026.1.0
+fsspec==2026.2.0
     # via dask
 gemmi==0.7.4
     # via ncrystal
@@ -117,13 +117,13 @@ packaging==26.0
     #   lazy-loader
     #   matplotlib
     #   pooch
-parso==0.8.5
+parso==0.8.6
     # via jedi
 partd==1.4.2
     # via dask
 pexpect==4.9.0
     # via ipython
-pillow==12.1.0
+pillow==12.1.1
     # via matplotlib
 platformdirs==4.5.1
     # via pooch
@@ -219,7 +219,7 @@ typing-inspection==0.4.2
     # via pydantic
 urllib3==2.6.3
     # via requests
-wcwidth==0.5.3
+wcwidth==0.6.0
     # via prompt-toolkit
 widgetsnbextension==4.0.15
     # via ipywidgets

diff --git a/requirements/basetest.txt b/requirements/basetest.txt
@@ -41,7 +41,7 @@ packaging==26.0
     #   pytest
 pandas==3.0.0
     # via -r basetest.in
-parso==0.8.5
+parso==0.8.6
     # via jedi
 pexpect==4.9.0
     # via ipython
@@ -81,7 +81,7 @@ typing-extensions==4.15.0
     # via ipython
 urllib3==2.6.3
     # via requests
-wcwidth==0.5.3
+wcwidth==0.6.0
     # via prompt-toolkit
 widgetsnbextension==4.0.15
     # via ipywidgets
diff --git a/requirements/ci.txt b/requirements/ci.txt
@@ -5,7 +5,7 @@
 #
 #    requirements upgrade
 #
-cachetools==7.0.0
+cachetools==7.0.1
     # via tox
 certifi==2026.1.4
     # via requests

diff --git a/requirements/dev.txt b/requirements/dev.txt
@@ -65,7 +65,7 @@ jupyter-server==2.17.0
     #   notebook-shim
 jupyter-server-terminals==0.5.4
     # via jupyter-server
-jupyterlab==4.5.3
+jupyterlab==4.5.4
     # via -r dev.in
 jupyterlab-server==2.28.0
     # via jupyterlab
@@ -77,7 +77,7 @@ overrides==7.7.0
     # via jupyter-server
 pip-compile-multi==3.2.2
     # via -r dev.in
-pip-tools==7.5.2
+pip-tools==7.5.3
     # via pip-compile-multi
 plumbum==1.10.0
     # via copier

diff --git a/requirements/docs.txt b/requirements/docs.txt
@@ -42,7 +42,7 @@ fastjsonschema==2.21.2
     # via nbformat
 imagesize==1.4.1
     # via sphinx
-ipykernel==7.1.0
+ipykernel==7.2.0
     # via -r docs.in
 ipympl==0.10.0
     # via -r docs.in

diff --git a/requirements/nightly.txt b/requirements/nightly.txt
@@ -44,7 +44,7 @@ executing==2.2.1
     # via stack-data
 fonttools==4.61.1
     # via matplotlib
-fsspec==2026.1.0
+fsspec==2026.2.0
     # via dask
 gemmi==0.7.4
     # via ncrystal
@@ -127,13 +127,13 @@ packaging==26.0
     #   pytest
 pandas==3.0.0
     # via -r nightly.in
-parso==0.8.5
+parso==0.8.6
     # via jedi
 partd==1.4.2
     # via dask
 pexpect==4.9.0
     # via ipython
-pillow==12.1.0
+pillow==12.1.1
     # via matplotlib
 platformdirs==4.5.1
     # via pooch
@@ -237,7 +237,7 @@ typing-inspection==0.4.2
     # via pydantic
 urllib3==2.6.3
     # via requests
-wcwidth==0.5.3
+wcwidth==0.6.0
     # via prompt-toolkit
 widgetsnbextension==4.0.15
     # via ipywidgets

diff --git a/src/ess/dream/beamline.py b/src/ess/dream/beamline.py
@@ -26,7 +26,11 @@ def choppers(configuration: InstrumentConfiguration) -> dict[str, DiskChopper]:
     """Return the chopper configuration for the given instrument configuration."""
 
     match configuration:
-        case InstrumentConfiguration.high_flux:
+        case (
+            InstrumentConfiguration.high_flux
+            | InstrumentConfiguration.high_flux_BC215
+            | InstrumentConfiguration.high_flux_BC240
+        ):
             return {
                 "psc1": DiskChopper(
                     frequency=sc.scalar(14.0, unit="Hz"),
@@ -115,9 +119,15 @@ def choppers(configuration: InstrumentConfiguration) -> dict[str, DiskChopper]:
                 "bcc": DiskChopper(
                     frequency=sc.scalar(112.0, unit="Hz"),
                     beam_position=sc.scalar(0.0, unit="deg"),
-                    phase=sc.scalar(215 - 180, unit="deg"),
-                    # Use 240 to reduce overlap between frames
-                    # phase=sc.scalar(240 - 180, unit="deg"),
+                    phase=sc.scalar(
+                        (
+                            240
+                            if configuration == InstrumentConfiguration.high_flux_BC240
+                            else 215
+                        )
+                        - 180,
+                        unit="deg",
+                    ),
                     axle_position=sc.vector(value=[0, 0, 9.78], unit="m"),
                     slit_begin=sc.array(
                         dims=["cutout"], values=[-36.875, 143.125], unit="deg"

diff --git a/src/ess/dream/data.py b/src/ess/dream/data.py
@@ -24,9 +24,11 @@
         "DREAM_simple_pwd_workflow/Cave_TOF_Monitor_diam_in_can.dat": "md5:ef24f4a4186c628574046e6629e31611",  # noqa: E501
         "DREAM_simple_pwd_workflow/Cave_TOF_Monitor_van_can.dat": "md5:2cdef7ad9912652149b7e687381d2e99",  # noqa: E501
         "DREAM_simple_pwd_workflow/Cave_TOF_Monitor_vana_inc_coh.dat": "md5:701d66792f20eb283a4ce76bae0c8f8f",  # noqa: E501
-        # BC215
+        # Time-of-flight lookup tables
         "DREAM-high-flux-tof-lookup-table.h5": "md5:1b95a359fa7b0d8b4277806ece9bf279",
         "DREAM-high-flux-tof-lookup-table-BC240-new0.h5": "md5:2cc9dc802082101933429a2ea3624126",  # noqa: E501
+        "DREAM-high-flux-tof-lut-5m-80m.h5": "md5:0db099795027e283f70cb48f738a1c44",
+        "DREAM-high-flux-tof-lut-5m-80m-bc240.h5": "md5:85c0a8acd7ed7f9793ef29f47776f63f",  # noqa: E501
         # Smaller files for unit tests
         "DREAM_simple_pwd_workflow/TEST_data_dream_diamond_vana_container_sample_union.csv.zip": "md5:405df9b5ade9d61ab71fe8d8c19bb51b",  # noqa: E501
         "DREAM_simple_pwd_workflow/TEST_data_dream_vana_container_sample_union.csv.zip": "md5:20186119d1debfb0c2352f9db384cd0a",  # noqa: E501
@@ -265,9 +267,14 @@ def tof_lookup_table_high_flux(bc: Literal[215, 240] = 215) -> Path:
 
     The table was created using the ``tof`` package and the chopper settings for the
     DREAM instrument in high-resolution mode.
-    Note that the phase of the band-control chopper (BCC) was set to 240 degrees to
-    match that of the simulated data (this has since been found to be non-optimal as it
-    leads to time overlap between the two frames).
+    Can return tables for two different band-control chopper (BC) settings:
+    - ``bc=215``: corresponds to the settings of the choppers in the tutorial data.
+    - ``bc=240``: a setting with less time overlap between frames.
+
+    Note that the phase of the band-control chopper (BCC) was set to 215 degrees in the
+    Geant4 simulation which generated the data used in the documentation notebooks.
+    This has since been found to be non-optimal as it leads to time overlap between the
+    two frames, and a value of 240 degrees is now recommended.
 
     This table was computed using `Create a time-of-flight lookup table for DREAM
     <../../user-guide/dream/dream-make-tof-lookup-table.rst>`_
@@ -281,8 +288,8 @@ def tof_lookup_table_high_flux(bc: Literal[215, 240] = 215) -> Path:
     """
     match bc:
         case 215:
-            return get_path("DREAM-high-flux-tof-lookup-table.h5")
+            return get_path("DREAM-high-flux-tof-lut-5m-80m.h5")
         case 240:
-            return get_path("DREAM-high-flux-tof-lookup-table-BC240-new0.h5")
+            return get_path("DREAM-high-flux-tof-lut-5m-80m-bc240.h5")
         case _:
             raise ValueError(f"Unsupported band-control chopper (BC) value: {bc}")
diff --git a/src/ess/dream/workflows.py b/src/ess/dream/workflows.py
@@ -18,6 +18,7 @@
     CaveMonitorPosition,  # Should this be a DREAM-only parameter?
     EmptyCanRun,
     KeepEvents,
+    LookupTableRelativeErrorThreshold,
     PixelMaskFilename,
     Position,
     ReducerSoftware,
@@ -209,6 +210,7 @@ def DreamGeant4Workflow(*, run_norm: RunNormalization, **kwargs) -> sciline.Pipe
         AccumulatedProtonCharge[VanadiumRun]: charge,
         AccumulatedProtonCharge[EmptyCanRun]: charge,
         CaveMonitorPosition: sc.vector([0.0, 0.0, -4220.0], unit='mm'),
+        LookupTableRelativeErrorThreshold: 0.02,
     }
     for key, value in additional_parameters.items():
         wf[key] = value

diff --git a/src/ess/powder/types.py b/src/ess/powder/types.py
@@ -41,6 +41,7 @@
 PulseStrideOffset = tof_t.PulseStrideOffset
 TimeOfFlightLookupTable = tof_t.TimeOfFlightLookupTable
 TimeOfFlightLookupTableFilename = tof_t.TimeOfFlightLookupTableFilename
+LookupTableRelativeErrorThreshold = tof_t.LookupTableRelativeErrorThreshold
 
 SampleRun = reduce_t.SampleRun
 VanadiumRun = reduce_t.VanadiumRun