A comprehensive Far-Field (FF) and Near-Field (NF) High Energy Diffraction Microscopy (HEDM) reference dataset collected at beamline 1-ID-E of the Advanced Photon Source (Argonne National Laboratory) on a Ti-7Al alloy sample (1 × 1 mm² cross-section). This dataset accompanies Sharma et al.,
Acta Crystallographica Section A ("MIDAS: A Quantitative Framework for High Energy Diffraction Microscopy -- Part II: Accuracy, Robustness, and Best Practices"), and is intended to serve as a community benchmark for validating 3D crystallographic reconstruction algorithms, comparing alternative HEDM software packages, and evaluating the impact of acquisition parameters on reconstruction quality.
Experimental configuration: Monochromatic beam at E = 65.351 keV (Hf K-edge), vertically focused using a sawtooth refractive lens (0.9 μm FWHM) and horizontally slitted (2.0 mm). The Ti-7Al sample, with a 1 × 1 mm² cross-section, was mounted in the RAMS rotation and loading device. Dark-field correction for NF data is computed internally by MIDAS from a through-data median filter; no separate dark images are provided for the NF scans. Dark images are provided for the FF acquisition.
FF folder
Raw Far-Field HEDM measurements acquired with a GE-41RT area detector (2048 × 2048 pixels, 200 μm pixel pitch) at a sample-to-detector distance of approximately 940 mm. All files are in the native GE
.ge3 format. Rotation step is -0.25° starting at +180°, giving 1440 frames per 360° sample rotation. A Pb attenuator disc was placed in the center of the detector to equalize the diffracted intensity across rings of widely varying structure factor.
CeO2_1s_000012.ge3 — CeO₂ calibration powder pattern (used with file 13 for calibration).CeO2_1s_000013.ge3 — CeO₂ calibration powder pattern, acquired 180° apart from file 12. The pair enables determination of the rotation-axis-to-detector distance, beam center, and detector tilts.dark_1s_000014.ge3 — Dark-current reference acquired immediately following the CeO₂ calibration.park_sam_cx5b_s0_ff_with_Pb2_000410.ge3 — Ti-7Al sample Far-Field scan with Pb central attenuator. Single file containing all 1440 frames covering 360° rotation at -0.25° per frame, starting at +180°.dark_after_000413.ge3 — Dark-current reference acquired after the sample scan, for temporal stability checks.
FF acquisition index
| File name | Type | Rotation start (°) | Rotation step (°) | Num frames | Notes |
|---|---|---|---|---|---|
|
CeO2_1s_000012.ge3 | calibration_powder | 0.0 | -0.25 | 1 | CeO₂ powder at ω = 0 |
|
CeO2_1s_000013.ge3 | calibration_powder | 180.0 | -0.25 | 1 | CeO₂ powder at ω = 180 (180° apart from file 12) |
|
dark_1s_000014.ge3 | dark | — | — | 1 | Dark-current reference acquired after CeO₂ calibration |
|
park_sam_cx5b_s0_ff_with_Pb2_000410.ge3 | sample | 180.0 | -0.25 | 1440 | Ti-7Al sample scan with Pb central attenuator; 360° total |
|
dark_after_000413.ge3 | dark | — | — | 1 | Dark-current reference acquired after sample scan |
NF folder
Raw Near-Field HEDM measurements acquired with a high-resolution detector. Each sample acquisition covers 360° rotation at -0.25° per frame (1440 sequentially numbered TIFF frames per acquisition). Dark-field correction is computed internally from a through-data median filter; no separate dark files are provided for the NF scans.
NF/DetZBeamPos/
Reference files recording the vertical position of the direct beam on the high-resolution detector at each detector distance. These are used to compute the initial guess for the beam center position during NF-HEDM geometric calibration.
NF/gordon_Au_nf/
Gold cube calibration data acquired at multiple sample-to-detector distances. Used to determine and refine the NF-HEDM experimental geometry (rotation-axis-to-detector distances, beam centers, and detector tilts) as described in Part I of the companion paper.
NF/park_sam_cx5b_s0_nf/
Ti-7Al sample Near-Field HEDM measurements, organized as
18 sample datasets spanning combinations of
6 starting rotation angles (180.00°, 180.05°, 180.10°, 180.20°, 179.95°, 179.90° — acquired in this order) and
3 sample vertical (z) positions (0, −2, −4 μm). Each of the 18 datasets contains
5 sample-to-detector distances (D1 through D5, approximately 4.5, 5.5, 6.5, 7.5, and 8.5 mm) for a total of
90 individual acquisitions, with
1440 sequentially numbered TIFF frames per acquisition (129,600 TIFF files total).
Files follow the naming convention
park_sam_cx5b_s0_nf_NNNNNN.tif, where
NNNNNN is a zero-padded six-digit frame index. All 90 acquisitions are stored flat in this single folder. Sequential frame numbering begins at
061601 for the first acquisition (frames 061601–063040, distance D1 of dataset 1), continues with
063041–064480 for distance D2 of the same dataset, and so on. Each subsequent dataset's first distance begins 7200 frames (5 × 1440) after the previous dataset's first distance. The precise mapping from frame ranges to (dataset index, starting omega, z-position, detector distance) is documented in the table below.
Datasets at nominally repeated sample positions with varying starting omega enable investigation of reconstruction sensitivity to sub-degree rotational offsets, while datasets at varying z-positions (separated by a few micrometers) enable studies of sensitivity to sub-micrometer vertical alignment.
Although each acquisition spans the full 360° rotation, the analysis described in the paper uses a 180° subrange. MIDAS internally selects the appropriate frame range from each 1440-frame acquisition based on the user-specified omega range in the parameter file. For example, specifying an omega range of -180° to 0° will cause MIDAS to use the latter 720 frames of an acquisition starting at +180°.
NF acquisition index
| Dataset | Dist idx | ω start (°) | z (μm) | Distance (mm) | Rot step (°) | Num frames | First frame | Last frame |
|---:|---:|---:|---:|---:|---:|---:|---:|---:|
| 1 | D1 | 180.00 | 0 | 4.5 | -0.25 | 1440 | 61601 | 63040 |
| 1 | D2 | 180.00 | 0 | 5.5 | -0.25 | 1440 | 63041 | 64480 |
| 1 | D3 | 180.00 | 0 | 6.5 | -0.25 | 1440 | 64481 | 65920 |
| 1 | D4 | 180.00 | 0 | 7.5 | -0.25 | 1440 | 65921 | 67360 |
| 1 | D5 | 180.00 | 0 | 8.5 | -0.25 | 1440 | 67361 | 68800 |
| 2 | D1 | 180.00 | −2 | 4.5 | -0.25 | 1440 | 68801 | 70240 |
| 2 | D2 | 180.00 | −2 | 5.5 | -0.25 | 1440 | 70241 | 71680 |
| 2 | D3 | 180.00 | −2 | 6.5 | -0.25 | 1440 | 71681 | 73120 |
| 2 | D4 | 180.00 | −2 | 7.5 | -0.25 | 1440 | 73121 | 74560 |
| 2 | D5 | 180.00 | −2 | 8.5 | -0.25 | 1440 | 74561 | 76000 |
| 3 | D1 | 180.00 | −4 | 4.5 | -0.25 | 1440 | 76001 | 77440 |
| 3 | D2 | 180.00 | −4 | 5.5 | -0.25 | 1440 | 77441 | 78880 |
| 3 | D3 | 180.00 | −4 | 6.5 | -0.25 | 1440 | 78881 | 80320 |
| 3 | D4 | 180.00 | −4 | 7.5 | -0.25 | 1440 | 80321 | 81760 |
| 3 | D5 | 180.00 | −4 | 8.5 | -0.25 | 1440 | 81761 | 83200 |
| 4 | D1 | 180.05 | 0 | 4.5 | -0.25 | 1440 | 83201 | 84640 |
| 4 | D2 | 180.05 | 0 | 5.5 | -0.25 | 1440 | 84641 | 86080 |
| 4 | D3 | 180.05 | 0 | 6.5 | -0.25 | 1440 | 86081 | 87520 |
| 4 | D4 | 180.05 | 0 | 7.5 | -0.25 | 1440 | 87521 | 88960 |
| 4 | D5 | 180.05 | 0 | 8.5 | -0.25 | 1440 | 88961 | 90400 |
| 5 | D1 | 180.05 | −2 | 4.5 | -0.25 | 1440 | 90401 | 91840 |
| 5 | D2 | 180.05 | −2 | 5.5 | -0.25 | 1440 | 91841 | 93280 |
| 5 | D3 | 180.05 | −2 | 6.5 | -0.25 | 1440 | 93281 | 94720 |
| 5 | D4 | 180.05 | −2 | 7.5 | -0.25 | 1440 | 94721 | 96160 |
| 5 | D5 | 180.05 | −2 | 8.5 | -0.25 | 1440 | 96161 | 97600 |
| 6 | D1 | 180.05 | −4 | 4.5 | -0.25 | 1440 | 97601 | 99040 |
| 6 | D2 | 180.05 | −4 | 5.5 | -0.25 | 1440 | 99041 | 100480 |
| 6 | D3 | 180.05 | −4 | 6.5 | -0.25 | 1440 | 100481 | 101920 |
| 6 | D4 | 180.05 | −4 | 7.5 | -0.25 | 1440 | 101921 | 103360 |
| 6 | D5 | 180.05 | −4 | 8.5 | -0.25 | 1440 | 103361 | 104800 |
| 7 | D1 | 180.10 | 0 | 4.5 | -0.25 | 1440 | 104801 | 106240 |
| 7 | D2 | 180.10 | 0 | 5.5 | -0.25 | 1440 | 106241 | 107680 |
| 7 | D3 | 180.10 | 0 | 6.5 | -0.25 | 1440 | 107681 | 109120 |
| 7 | D4 | 180.10 | 0 | 7.5 | -0.25 | 1440 | 109121 | 110560 |
| 7 | D5 | 180.10 | 0 | 8.5 | -0.25 | 1440 | 110561 | 112000 |
| 8 | D1 | 180.10 | −2 | 4.5 | -0.25 | 1440 | 112001 | 113440 |
| 8 | D2 | 180.10 | −2 | 5.5 | -0.25 | 1440 | 113441 | 114880 |
| 8 | D3 | 180.10 | −2 | 6.5 | -0.25 | 1440 | 114881 | 116320 |
| 8 | D4 | 180.10 | −2 | 7.5 | -0.25 | 1440 | 116321 | 117760 |
| 8 | D5 | 180.10 | −2 | 8.5 | -0.25 | 1440 | 117761 | 119200 |
| 9 | D1 | 180.10 | −4 | 4.5 | -0.25 | 1440 | 119201 | 120640 |
| 9 | D2 | 180.10 | −4 | 5.5 | -0.25 | 1440 | 120641 | 122080 |
| 9 | D3 | 180.10 | −4 | 6.5 | -0.25 | 1440 | 122081 | 123520 |
| 9 | D4 | 180.10 | −4 | 7.5 | -0.25 | 1440 | 123521 | 124960 |
| 9 | D5 | 180.10 | −4 | 8.5 | -0.25 | 1440 | 124961 | 126400 |
| 10 | D1 | 180.20 | 0 | 4.5 | -0.25 | 1440 | 126401 | 127840 |
| 10 | D2 | 180.20 | 0 | 5.5 | -0.25 | 1440 | 127841 | 129280 |
| 10 | D3 | 180.20 | 0 | 6.5 | -0.25 | 1440 | 129281 | 130720 |
| 10 | D4 | 180.20 | 0 | 7.5 | -0.25 | 1440 | 130721 | 132160 |
| 10 | D5 | 180.20 | 0 | 8.5 | -0.25 | 1440 | 132161 | 133600 |
| 11 | D1 | 180.20 | −2 | 4.5 | -0.25 | 1440 | 133601 | 135040 |
| 11 | D2 | 180.20 | −2 | 5.5 | -0.25 | 1440 | 135041 | 136480 |
| 11 | D3 | 180.20 | −2 | 6.5 | -0.25 | 1440 | 136481 | 137920 |
| 11 | D4 | 180.20 | −2 | 7.5 | -0.25 | 1440 | 137921 | 139360 |
| 11 | D5 | 180.20 | −2 | 8.5 | -0.25 | 1440 | 139361 | 140800 |
| 12 | D1 | 180.20 | −4 | 4.5 | -0.25 | 1440 | 140801 | 142240 |
| 12 | D2 | 180.20 | −4 | 5.5 | -0.25 | 1440 | 142241 | 143680 |
| 12 | D3 | 180.20 | −4 | 6.5 | -0.25 | 1440 | 143681 | 145120 |
| 12 | D4 | 180.20 | −4 | 7.5 | -0.25 | 1440 | 145121 | 146560 |
| 12 | D5 | 180.20 | −4 | 8.5 | -0.25 | 1440 | 146561 | 148000 |
| 13 | D1 | 179.95 | 0 | 4.5 | -0.25 | 1440 | 148001 | 149440 |
| 13 | D2 | 179.95 | 0 | 5.5 | -0.25 | 1440 | 149441 | 150880 |
| 13 | D3 | 179.95 | 0 | 6.5 | -0.25 | 1440 | 150881 | 152320 |
| 13 | D4 | 179.95 | 0 | 7.5 | -0.25 | 1440 | 152321 | 153760 |
| 13 | D5 | 179.95 | 0 | 8.5 | -0.25 | 1440 | 153761 | 155200 |
| 14 | D1 | 179.95 | −2 | 4.5 | -0.25 | 1440 | 155201 | 156640 |
| 14 | D2 | 179.95 | −2 | 5.5 | -0.25 | 1440 | 156641 | 158080 |
| 14 | D3 | 179.95 | −2 | 6.5 | -0.25 | 1440 | 158081 | 159520 |
| 14 | D4 | 179.95 | −2 | 7.5 | -0.25 | 1440 | 159521 | 160960 |
| 14 | D5 | 179.95 | −2 | 8.5 | -0.25 | 1440 | 160961 | 162400 |
| 15 | D1 | 179.95 | −4 | 4.5 | -0.25 | 1440 | 162401 | 163840 |
| 15 | D2 | 179.95 | −4 | 5.5 | -0.25 | 1440 | 163841 | 165280 |
| 15 | D3 | 179.95 | −4 | 6.5 | -0.25 | 1440 | 165281 | 166720 |
| 15 | D4 | 179.95 | −4 | 7.5 | -0.25 | 1440 | 166721 | 168160 |
| 15 | D5 | 179.95 | −4 | 8.5 | -0.25 | 1440 | 168161 | 169600 |
| 16 | D1 | 179.90 | 0 | 4.5 | -0.25 | 1440 | 169601 | 171040 |
| 16 | D2 | 179.90 | 0 | 5.5 | -0.25 | 1440 | 171041 | 172480 |
| 16 | D3 | 179.90 | 0 | 6.5 | -0.25 | 1440 | 172481 | 173920 |
| 16 | D4 | 179.90 | 0 | 7.5 | -0.25 | 1440 | 173921 | 175360 |
| 16 | D5 | 179.90 | 0 | 8.5 | -0.25 | 1440 | 175361 | 176800 |
| 17 | D1 | 179.90 | −2 | 4.5 | -0.25 | 1440 | 176801 | 178240 |
| 17 | D2 | 179.90 | −2 | 5.5 | -0.25 | 1440 | 178241 | 179680 |
| 17 | D3 | 179.90 | −2 | 6.5 | -0.25 | 1440 | 179681 | 181120 |
| 17 | D4 | 179.90 | −2 | 7.5 | -0.25 | 1440 | 181121 | 182560 |
| 17 | D5 | 179.90 | −2 | 8.5 | -0.25 | 1440 | 182561 | 184000 |
| 18 | D1 | 179.90 | −4 | 4.5 | -0.25 | 1440 | 184001 | 185440 |
| 18 | D2 | 179.90 | −4 | 5.5 | -0.25 | 1440 | 185441 | 186880 |
| 18 | D3 | 179.90 | −4 | 6.5 | -0.25 | 1440 | 186881 | 188320 |
| 18 | D4 | 179.90 | −4 | 7.5 | -0.25 | 1440 | 188321 | 189760 |
| 18 | D5 | 179.90 | −4 | 8.5 | -0.25 | 1440 | 189761 | 191200 |
Mapping to datasets described in the paper
Only a subset of the 90 NF acquisitions is used in the published analysis. The paper (Table 5 of Part II) describes 11 NF datasets (numbered 0–10). All of these use
only distances D1 and D5 (i.e., the nearest and farthest detector positions), and all but dataset 10 use a
180° rotation subrange of the corresponding 360° upload acquisition. MIDAS handles this automatically: the user specifies the desired omega range in the parameter file, and MIDAS selects the appropriate subset of frames from each 1440-frame acquisition.
The table below shows how the paper datasets map to the upload datasets. Datasets with ω = 180.05° and ω = 179.95° (upload datasets 4–6 and 13–15) are
not used in the paper — they are provided as additional data for users wishing to explore finer rotational offsets.
| Paper dataset | Upload dataset | ω start (upload) (°) | z (μm) | Distances used | Rotation range | ω subrange used (°) |
|:---:|:---:|---:|---:|:---:|:---:|---|
| 0 | 1 | 180.00 | 0 | D1, D5 | 180° (half) | 0.00 → −180.00 |
| 1 | 7 | 180.10 | 0 | D1, D5 | 180° (half) | 0.10 → −179.90 |
| 2 | 8 | 180.10 | −2 | D1, D5 | 180° (half) | 0.10 → −179.90 |
| 3 | 9 | 180.10 | −4 | D1, D5 | 180° (half) | 0.10 → −179.90 |
| 4 | 16 | 179.90 | 0 | D1, D5 | 180° (half) | 0.15 → −179.85 |
| 5 | 17 | 179.90 | −2 | D1, D5 | 180° (half) | 0.15 → −179.85 |
| 6 | 18 | 179.90 | −4 | D1, D5 | 180° (half) | 0.15 → −179.85 |
| 7 | 10 | 180.20 | 0 | D1, D5 | 180° (half) | 0.20 → −179.80 |
| 8 | 11 | 180.20 | −2 | D1, D5 | 180° (half) | 0.20 → −179.80 |
| 9 | 12 | 180.20 | −4 | D1, D5 | 180° (half) | 0.20 → −179.80 |
| 10 | 1 | 180.00 | 0 | D1, D5 | 360° (full) | 180.00 → −180.00 |
Paper datasets 0 and 10 share the same raw upload dataset (upload dataset 1, ω = 180.00°, z = 0); the difference is that dataset 10 uses the full 1440-frame 360° rotation, while dataset 0 uses only the 180° subrange (frames 721–1440 of each distance). Paper datasets 1–9 explore reconstruction sensitivity to small starting-omega offsets (+0.10°, +0.15°, and +0.20°) and small vertical sample displacements (0, −2, −4 μm), all using the 180° subrange. See Table 5 and Section 3 of Part II of the companion paper for the full analysis.
Analysis reproducibility
The analysis presented in the companion paper was performed using a frozen snapshot of the MIDAS framework at git commit
0915604f (full SHA:
0915604f88aba3f76b5a3396e84e79c9941b0d89). Users wishing to reproduce the exact results reported in the paper should check out this specific commit from the MIDAS GitHub repository (
https://github.com/marinerhemant/MIDAS).
The MIDAS framework has continued to evolve since the analysis was performed, with additional algorithmic improvements in forward simulation, peak fitting, and refinement. Running the current release of MIDAS (or any other HEDM software package) on the raw data provided here may therefore produce results that differ slightly from those reported in the companion paper. The refined experimental geometry parameters, ring-by-ring analysis settings, and representative reconstruction outputs used in the published analysis are documented in the tables and figures of the paper.
Refined result files (
Grains.csv, consolidated HDF5 outputs, NF-HEDM orientation maps) and MIDAS parameter configuration files (
Parameters.txt) are intentionally not included in this release, because the authoritative versions of these files correspond to the frozen MIDAS commit referenced above and can be regenerated by any user who checks out that commit and runs the analysis on the raw data provided. Users interested in the numerical values of the refined parameters are referred directly to the companion paper.
Acknowledgments: This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science user facility at Argonne National Laboratory, and is based on research supported by the U.S. DOE Office of Science - Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.