---
tags: diagnostics, langmuir, minutes
---

# PlasmaPy Langmuir Meeting | Monday 2020 December 14 at 11:00 PT / 14:00 ET

[](https://hackmd.io/q4l1AnMLQgWzdwNdanDkjg)

### Video Conference Information
* Instant messaging: [Matrix](https://element.im/app/#/room/#plasmapy:openastronomy.org) and [Gitter](https://gitter.im/PlasmaPy/Lobby)
* [GitHub Minutes Repository](https://github.com/PlasmaPy/plasmapy-meeting-notes)
* [Langmuir Sub-directory](https://github.com/PlasmaPy/plasmapy-meeting-notes/tree/master/langmuir_2020-present)
* [PlasmaPy on GitHub](https://github.com/PlasmaPy/plasmapy) ([pull requests](https://github.com/PlasmaPy/plasmapy/pulls), [issues](https://github.com/PlasmaPy/plasmapy/issues))
* [PlasmaPy Enhancement Proposals on GitHub](https://github.com/PlasmaPy/PlasmaPy-PLEPs)
* [PlasmaPy Google Calendar](https://calendar.google.com/calendar?cid=bzVsb3ZkcW0zaWxsam00ZTlrMDd2cmw5bWdAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ)
* GitHub Project: [Prototype | Analysis, Diagnostic, and the Swept Langmuir](https://github.com/PlasmaPy/PlasmaPy/projects/19)

## Attendees

1. Steve
2. Erik
3. Gurleen

## Action Items

**copy action items from last week**

***Erik***
* Open PR to update fit_function Linear.root_solve that handles `m = 0` and `b = 0` cases
* Finish writing tests for `find_floating_potential()`
* Add to list of functionality the ability to find `Te` from fitting to the left side of the dI/dV peak.

***Gurleen***
* Implement a prominence "uncertainty" for `vp` inf `find_plasma_potential_didv()`.
* for "uncertainty" will use FWHM of the peak
* also report the prominence of the peak

***Future***
* open an issue to construct a metric that considers the signal noise when reporting the peaks "prominence" (`find_plasma_potential_didv()`)

## Agenda (please feel free to edit or add items)

1. Introductions
2. GitHub Project: [Prototype | Analysis, Diagnostic, and the Swept Langmuir](https://github.com/PlasmaPy/PlasmaPy/projects/19)
3. ...
4. ...
5. Issues
1. ...
2. ...
6. Pull requests in progress
1. [PR #889](https://github.com/PlasmaPy/PlasmaPy/pull/889): calculating floating potential
2. [PR #897](https://github.com/PlasmaPy/PlasmaPy/pull/897): plasma potential via dI/dV
3. [PR #813](https://github.com/PlasmaPy/PlasmaPy/pull/813): Langmuir & Diagnostic Framework

## Minutes

* Gurleen started incorporating an uncertainty for `find_plasma_potential_didv()`
* fit a Gaussian + zero offset to the peak
* the Gaussian defines the peak and reporting the "uncertainty" as FWHM
* approach for `find_plasma_portential_didv()`
1. find peak using `scipy.signal.find_peaks()` and report "uncertainty" as FWHM (default, or user can request a prominence)
2. merge above functionality
3. in followup PR add fits for Gaussian, Cauchy, and two exponential+linear
4. in followup PR that calcs Te using the left side exponential+linear fit
* should be a separate function that is called by `didv`
* should not duplicate calculations
* should be a requested calculation done by `didv`
* **Next meeting tentatively the Jan. 11th, 2021**