Michael Poehlmann

Welcome to my website! I am a physics PhD student searching for elusive dark matter particle interactions as part of the DarkSide collaboration.

ABOUT ME

about.

I'm passionate about research and driven by curiosity.

My name is Michael (David-Michael) Poehlmann. I am a PhD student at the University of California, Davis studying high energy experimental physics. I work with Prof. Emilija Pantic on liquid argon-based rare event searches. Specifically, I specialize in simulations and data analysis for the DarkSide Collaboration, working towards the discovery of dark matter.

As an undergraduate at the University of Minnesota, I worked with Prof. Prisca Cushman on the active neutron veto for the SuperCDMS SNOLAB detector. I doped plastic scintillators with gadolinium and characterized sample properties.

One of my other undergraduate research experiences was working with Prof. Jeremiah Mans. I measured the event discrimination efficiency of thin plastic scintillator sheets for the LDMX experiment.

research.

My quest for the detection of rare events.

Here, I am shown presenting a poster on ARIS-ER.

DarkSide

The DarkSide Program aims at the direct detection of dark matter using two-phase argon time projection chambers (TPCs). The upcoming phase of the DarkSide Program is DarkSide-20k, a next-generation dark matter detector at the Laboratori Nazionali del Gran Sasso in Italy.

As a member of the DarkSide Collaboration, I run simulations to inform the design of DarkSide-20k, with a focus on backgrounds and optical modeling. I also contribute to the analysis of data collected by DarkSide-50.


ARIS-ER

One of the most significant analysis limitations faced by DarkSide-20k is the accurate modeling of the detector's response to different classes of dark matter interactions. In 2017, the ARIS experiment measured the scintillation and ionization response of LAr to impinging neutrons of known energy. In a continuing effort to study the response of liquid argon at low energies, the proposed Argon Recoil Ionization and Scintillation from Electron Recoils (ARIS-ER) experiment will measure the response of liquid argon to monoenergetic gammas which Compton scatter in the detector. ARIS-ER will take place at UC Davis and begin taking data in 2021.

For ARIS-ER, I am involved in the experimental design, data acquisition (DAQ) system development, hardware development, and detector commissioning. Once data is taken, I will also be involved in the ARIS-ER analysis.

outreach.

I hope to make physics more accessible to untapped groups.

Nuclear Forensics

I have helped to develop an outreach program to provide undergraduate students with an introduction to experimental high energy physics. The program, entitled "Nuclear Forensics: Dusting for the Fingerprints of Radioactivity," seeks to provide untapped groups with a hands-on experience to identify trace radioisotopes through Neutron Activation Analysis (NAA). NAA is a nuclear process used to determine the concentrations of elements in a material via neutron irradiation of a sample and measurements of the emitted gamma-rays. Participants perform lab activities and conduct data analysis in Python. The first iteration of this outreach effort was scheduled for the the spring of 2020, but was postponed due the COVID-19 pandemic. The code I wrote for this activity can be found on my GitHub.


High Energy Physics Tutorials

One of the biggest hurdles for students beginning in experimental high energy physics is learning to code well. Furthermore, modern data science techniques are just beginning to become widely adopted within the field of physics. To help current and future students learn these skills, I am developing a set of tutorials and examples for HEP applications of languages and toolkits including Python, C/C++, Julia, ROOT, and Geant4.

The nuclear reactor at the McClellan Nuclear Research Center is used to irradiate samples for the NAA activity.

beyond physics.

A love of the outdoors.

Here, I am shown atop Le Brevent, with Mont Blanc in the background.

When I'm not doing physics research, I love to explore the outdoors. My favorite activites include kayaking the lakes of Wisconsin and Minnesota and hiking in the Sierra Nevada mountain range.

Some of my other hobbies include baking, reading, and tennis. I'm also an avid follower of English Premier League soccer. I care about numerous social justice issues, particularly animal rights.

curriculum vitae.

Honors and Fellowships

  1. Honorable Mention, Graduate Research Fellowship Program, National Science Foundation (2020)
  2. F. Paul Brady Graduate Fellowship, University of California, Davis (2019)
  3. Gold Scholar Award, University of Minnesota (2014-2018)
  4. Dean's List, College of Science and Engineering, University of Minnesota (2014-2018)
  5. National Merit Scholar, National Merit Scholarship Corporation (2014)

Publications

  1. P. Agnes, et al., Sensitivity of future liquid argon dark matter search experiments to core-collapse supernova neutrinos, Submitted to JCAP for publication (2020).
  2. D.M. Poehlmann, et al., Characterization of gadolinium-loaded plastic scintillator for use as a neutron veto, Submitted to NIM A for review (2018). arXiv:1812.11267
    • First-authored paper for which I fabricated and characterized scintillator samples.

Presentations

  1. D.M. Poehlmann, Constraints on sub-GeV dark matter-electron scattering from the DarkSide-50 experiment, 2020 Fall Meeting of the Far West Section of the American Physical Society Conference, Virtual (Oct 2020).
    • Talk given virtually at the 2020 APS Far West Section meeting.
    • Available: abstract, slides
  2. D.M. Poehlmann, The DarkSide-20k experiment in 10 minutes, Fermilab New Perspectives 2020 Conference, Virtual (July 2020).
    • Talk given virtually at the Fermilab New Perspectives 2020 conference.
    • Available: abstract, slides
  3. D.M. Poehlmann, Argon recoil ionization and scintillation from electron recoils (ARIS-ER), 2019 Fall Meeting of the Far West Section of the American Physical Society Conference, Stanford (Nov 2019).
    • Poster presented at the 2019 APS Far West Section meeting at Stanford University.
    • Available: abstract, poster

contact.

Michael Poehlmann

poehlmann@ucdavis.edu