Stefan Ulmer (physicist)

Stefan Ulmer is a particle physicist and chief scientist at the Ulmer Fundamental Symmetries Laboratory, RIKEN, Tokyo. He is the founder and the spokesperson of the BASE experiment (AD-8) at the Antiproton Decelerator facility at CERN, Geneva. Stefan Ulmer is well known for his contributions to improving Penning trap techniques and precision measurements on antimatter. He is the first person to observe the single spin transitions with a single trapped antiproton, a significant achievement towards the antiproton magnetic moment measurements.[1][2][3]

Stefan Ulmer at BASE Collaboration, CERN

Stefan Ulmer completed his Ph.D. thesis from the Heidelberg University, Germany, under the supervision Wolfgang Quint in 2011. Ulmer's studies focused on the first observation of spin flips with a single proton stored in a cryogenic penning trap.[4][5]

Research

Stefan Ulmer joined the ASACUSA CUSP experiment at CERN in 2012 as a postdoctorate fellow and contributed to producing the first polarized antihydrogen beam.[6][5] Simultaneously, he worked on setting up the BASE experiment. He invented a reservoir trap technique that allowed the BASE experiment to store antiprotons for about 400 days.  In 2014, Stefan Ulmer’s team performed the most precise measurement of the proton-antiproton charge-to-mass ratio, evidently the most accurate test of CPT invariance of baryons.[1][3][7] Later in 2017, his team also completed the most precise measurements of antiproton magnetic moment. Followed by, the first observation of single antiproton spin transitions. This measurements are considered to be outstanding and of great value to the fundamental physics research.[1][3][8]

Awards and recognition
Stefan Ulmer at the BASE experimental setup

Stefan Ulmer has received following awards and recognition for his contributions in physics.

  1. International Union of Pure and Applied Physics (IUPAP) young scientist award in fundamental metrology, 2014, for his work on the high-precision comparisons of the fundamental properties of the protons and the antiprotons.[8][9]
  2. He was elected as chairperson and official representative of the antimatter physics community of CERN in 2014.[10]

References
  1. Symmetries, Max Planck-RIKEN-PTB Center for Time, Constants and Fundamental. "Max Planck-RIKEN-PTB Center for Time, Constants and Fundamental Symmetries - Group of Stefan Ulmer". www.mpi-hd.mpg.de. Retrieved 2021-07-15.
  2. Ulmer, Dr Stefan. "Ulmer Fundamental Symmetries Laboratory". ulmerfsl.riken.jp. Retrieved 2021-07-15.
  3. ORCID. "Stefan Ulmer (0000-0002-4185-4147)". orcid.org. Retrieved 2021-07-15.
  4. Ulmer, Stefan (2011). "First Observation of Spin Flips with a single Proton stored in a cryogenic Penning trap". archiv.ub.uni-heidelberg.de. Retrieved 2021-07-16.
  5. Yamazaki, Yasunori; Ulmer, Stefan (2013). "CPT symmetry tests with cold and antihydrogen". Annalen der Physik. 525 (7): 493–504. doi:10.1002/andp.201300060. ISSN 1521-3889.
  6. Kuroda, N.; Ulmer, S.; Murtagh, D. J.; Van Gorp, S.; Nagata, Y.; Diermaier, M.; Federmann, S.; Leali, M.; Malbrunot, C.; Mascagna, V.; Massiczek, O. (2015). "The ASACUSA CUSP: an antihydrogen experiment". Hyperfine Interactions. 235 (1–3): 13–20. doi:10.1007/s10751-015-1205-1. ISSN 0304-3843.
  7. Ulmer, Dr Stefan. "Research Topics | Ulmer Fundamental Symmetries Laboratory". ulmerfsl.riken.jp. Retrieved 2021-07-16.
  8. iupap (2021-03-05). "C2: Awards - IUPAP: The International Union of Pure and Applied Physics". Retrieved 2021-07-16.
  9. "FLAIR - News". Facility for Low-Energy Antiproton and Ion Research. Retrieved 2021-07-16.
  10. "New chairs for the Antiproton Decelerator Users Community". CERN. Retrieved 2021-07-16.
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