`raw_data_1/instrument/detector_<N>`

This is a NXdetector.

Spectra are grouped into different detector_<N> groups based on the time-regime set they share. In other words, detector_N contains data from all spectra configured to use time regime N.

`raw_data_1/instrument/detector_<N>/counts`

This is the histogram data for detector N, as int32 counts. It has dimensions periods,spectra,time_channels, where periods is the number of DAQ periods (which may be different from the total number of periods).

This is written only if histograms were requested.

Attributes:

units: "counts"
signal: 1
axes:
- On a muon instrument: "period_index,spectrum_index,raw_time"
- On a neutron instrument: "period_index,spectrum_index,time_of_flight"
long_name: "positron_counts" (written on Muon instruments only)

`raw_data_1/instrument/detector_<N>/spectrum_index`

Mapping of array position in the histogram array to spectrum IDs, as an int32.

Muon-specific datasets

Caution

TODO

`raw_data_1/instrument/detector_<N>/period_index`

This is a NeXus link to raw_data_1/instrument/dae/period_index.

`raw_data_1/instrument/detector_<N>/time_of_flight`

This is a NeXus link to raw_data_1/instrument/dae/time_channels_<N>/time_of_flight.

`raw_data_1/instrument/detector_<N>/time_of_flight_raw`

This is a NeXus link to raw_data_1/instrument/dae/time_channels_<N>/time_of_flight_raw.

It is only written on Neutron instruments.

`raw_data_1/instrument/detector_<N>/source_detector_distance`

This is user-settable float32 metadata. It is set in IBEX under Experiment Details -> Sample Parameters -> Sample Detector Distance

Caution

The parameter name in the NeXus file is the source-detector distance, whereas in IBEX it is called the sample-detector distance. This is only consistent it one interprets the “source” of the scattered radiation as being the sample.

`raw_data_1/instrument/detector_<N>/polar_angle`

This is the average polar angle (two-theta) of a spectrum, as a float32. It is an average because a spectrum may be made from multiple detector pixels.

Attributes:

units: "degree"

`raw_data_1/instrument/detector_<N>/distance`

This is the L2 flight path of a spectrum, as a float32. It is an average because a spectrum may be made from multiple detector pixels.

Attributes:

units: "metre"

`raw_data_1/instrument/detector_<N>/delt`

This is the “hold-off time” of a spectrum, as a float32. It is an average because a spectrum may be made from multiple detector pixels. It is in us, but a units attribute is not written.

`raw_data_1/instrument/detector_<N>/azimuthal_angle`

This is the azimuthal angle of a spectrum, as a float32. It is an average because a spectrum may be made from multiple detector pixels.

Attributes:

units: "degree"

`raw_data_1/instrument/detector_<N>/user_table<N>`

These are arbitrary user-specified tables for each detector, as a float32. It is an average because a spectrum may be made from multiple detector pixels.

User tables start from user_table01.

user_table01 is always equivalent to raw_data_1/instrument/detector_<N>/azimuthal_angle.

`raw_data_1/instrument/detector_<N>/event_frame_number`

This is the frame number corresponding to each entry in raw_data_1/detector_<N>_events/event_time_zero, as an int32. It always increments by 1 for each frame.