manual adjustments and cleanup

## Attendees (reconstructed from notes)

Scientists & back-end devs present or named in the room: John (Hetrick),

Valeria Lauter, Tim Charlton, Erik Watkins, Marie Backman, Becky Anderson,

Volker Urban, Jim Browning, Glen Elsarboukh, Kevin Tactac, Lauren (Lauren?

mentioned re: iPD / template tabs). Bogdan chaired. Erik arrived late (before

Session 1, re-entered notes at p.16).

Scientists & software devs present or named in the room: John (Hetrick),

Valeria Lauter, Tim Charlton, Erik Watkins, Asmaa Qdemat,Marie Backman, Becky Anderson,

Volker Urban, Jim Browning, Glass Elsarboukh, Kevin Tactac.

---

### Where the code is today

- **lr_reduction (refined):** "good ideas" in the rewrite, but UI, business

  logic and interstate coupling all handled in one place; a change in one

  logic and inter-state coupling all handled in one place; a change in one

  tends to affect the others.

- **QuickNXSv2:** approximately follows the **Model-View-Presenter** pattern

  and is therefore the better starting point for a clean separation. What is

- **One data-reduction UI for both instruments**, sitting on top of a shared

  back-end that exposes the same surface for LR and MR, with per-instrument

  specialization encapsulated below.

- The mechanism Marie proposed for handling the LR/MR differences: a

- The mechanism Kevin proposed for handling the LR/MR differences: a

  **Strategy pattern** — each reduction-phase function is parameterized by an

  instrument-specific descriptor (e.g. a `LR` dict and an `MR` dict) so the

  orchestration code stays common.

  question was why LR has drifted toward a new workflow separate from

  QuickNXS.

- **Fidelity / correctness first.** John's warning (carefully addressed to

  Volker): *"the one problem in the back-end is the MR → ref mapping"* — we

  Volker): *"the one problem in the back-end is the MR → LR mapping"* — we

  should not fix problems by putting them aside; they may resurface.

- **HTML report.** Tim observed that reproducing results via HTML reports is

  today sufficient for many users (report answers most questions modulo

---

## 11:00 – 12:00 · Scientist Assessment (continued) — the user experience

## 11:00 – 12:00 · Scientist Input  (continued) — the user experience

This block was originally the "Developer Assessment" slot on the agenda, but

in practice the scientists kept the floor and elaborated the UX requirements

- Not a preview. A **check of how good reduction has been, given the

  instrument setup**.

- Leah/Becky: give me the reflectivity *and* let me see intermediate steps

- Becky: give me the reflectivity *and* let me see intermediate steps

  (toggle solve / intermediate stages on/off; plot of projected peak vs.

  detector; modeled vs. measured shape). "Show exactly where binning is — in

  R/Q, see what the algorithm is binning along, trace along angle or curve

  **ORSO format** was discussed as a candidate for chunked, self-describing

  output.

**12:08 demo:** Bogdan/team showed `mr-launcher` running the new workflow

**12:08 demo:** Becky+Erik showed `nr_launcher` running the new workflow

just before lunch.

---

## 13:00 – 15:00 · Session 1 — Deep dive into reduction semantics

The afternoon session worked through concrete reduction semantics, largely

in front of QuickNXSv2 dev and `mr-launcher`. Notes from pages 14–17 of the

in front of QuickNXSv2 dev and `nr_launcher`. Notes from pages 14–17 of the

PDF:

### Matching templates to runs

  command-line switch that fixes the mode for a session. *This was not

  closed on Day 1 — revisit.*

- Related: this architecture also naturally **repurposes to a batch

  processor** (trade the UI for a liquid/MR function call), which is how

  processor** (trade the UI for a LR/MR function call), which is how

  autoreduce re-enters the picture.

### Auto-select runs (after Erik arrived)

### Auto-select runs (after Erik rejoins)

- Q: Is there a way to auto-select runs?

- A: Input a range of runs; metadata in each run tells the series. Sort by

- Four-in flips in template (`thip` – Sample, `that` – Sample, `this`).

- Point: need to match up (e.g. substrate / DAS). Off-spec run numbers

  captured: `nfs59 db 160, 161`.

  captured: `44159+44160+44161` db 44148`.

- Finishing note, written in a box on page 17: **"Agree QuickNXSv2 is V1\*

  + modularize (LR) + can't block it."** This is the Day 1 threshold-goal

  agreement.

## 15:00 – 16:30 · pyNEX catch-up (optional)

Susan Hubbard had reserved the original pyNEX room, so the group came to

the hack-a-thon room and hosted the discussion here. Jim Browning's post-doc

(the pyNEX developer) led it. The handwritten notes for this block are

sparse; from the transcripts:

- pyNEX was pitched as an alternative to Mantid for reading vision data.

- The session reviewed off-specular calculation: the speaker walked

  attendees (for those new to it) through specular vs off-specular:

  *specular = Q vector matches incident and exit angles; off-specular =

  anywhere else; the material's nuclear variations / discontinuities drive

  the offset from Snell's law.* Good context for the REF_M team but

  unrelated to modularization decisions.

- Agreed to run the *dev* QuickNXSv2 (new workflow branch) for

  demonstration. Explored stitching, the "magic wand" auto-select button

  (poorly tested, no one remembers using it recently — candidate for

  deprecation), direct-beam matching, smoothing, polynomial fits, K factor,

  critical-edge normalisation, and DAT-file save.

- Attendees surfaced ergonomic complaints that echo the morning

  (black-boxed caches, unclear when results are saved, lots of clicking

  when switching samples).

the hack-a-thon room and hosted the discussion here.

---

  I've attributed it loosely.

- A few handwritten shorthand tokens were ambiguous to me — in

  particular the "UDICE" and "realm" annotations on pages 12 and 15,

  and several speaker initials where Valeria / Volker / Vallerie were

  and several speaker initials where Valeria / Volker were

  hard to disambiguate. Please correct me in your review and I will

  fold the corrections into the Day 2 summary.

- The `quicknxsv2-modularization` branch's pre-meeting deck

  discussion followed.

---

*Ready for your review. Please flag anything I got wrong or missed, and

I will update before drafting the Day 2 summary.*