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NUG Community Call April 18, 2024

April 18, 2024
Date: Thursday, April 18, 2024
Time: 01:00 PM PST


The Monthly NUG Community Call is a regular opportunity for our users to show off what they've done, for NERSC to get feedback from users, and for users to exchange ideas.

Zoom: Join from PC, Mac, Linux, iOS or Android:
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We'll also use the NERSC Users Slack #webinars channel for discussion before, during and after the meeting.

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  • Announcements and Calls for Participation: Upcoming conferences, workshops, or other events, that you think might interest or benefit the NERSC user community
  • Grads@NERSC: How to Submit a Great Ticket
  • NERSC Early Career Award Winner Speaker: "Building the Largest 3d Map of the Universe with DESI and NERSC - Anthony Kremin, PhD


The Dark Energy Spectroscopic Instrument (DESI) is the largest extragalactic optical spectroscopic survey and has just completed its third year of observations toward its five-year mission. In April of 2024, multiple analyses of the first year of data were announced, showing the tightest constraints to date on the expansion history of the Universe from a specific cosmological signature called Baryon Acoustic Oscillations. In this talk, I will introduce DESI, describe how the data is acquired and analyzed, and touch upon the results announced from the first-year analyses. I will then go into more detail about how I have used both Cori and Perlmutter at NERSC to facilitate the overnight processing of telescope data within minutes of acquisition, while also providing a fully featured workflow for large-scale reprocessing campaigns of multi-year datasets.


Dr. Kremin is a Project Scientist at Lawrence Berkeley National Laboratory working on the Dark Energy Spectroscopic Instrument. Before arriving at Berkeley Lab as a Postdoctoral Researcher, he received his Ph.D. in Physics from the University of Michigan, Ann Arbor. For the past four years, he has been working with DESI to develop and run the spectroscopic pipeline used to manage, process, and aggregate the raw spectroscopic data into meaningful cosmological catalogs using NERSC computing resources.

Video Recording: 

Presentation Slides:
NUG Community Call April 18 2024 Slides