Anna Grassellino

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Anna Grassellino (2012)

Anna Grassellino (* in Marsala ) is an Italian electrical engineer. She received several prizes for the development of superconducting cavity resonators for microwaves , which are used in high-energy accelerators such as the LHC and the planned ILC for particle acceleration.

Grassellino received her Laureate Degree in Electronics Engineering from the University of Pisa in 2005 and was at the University of Pennsylvania from 2008 , where she received her PhD in 2012. She then worked at Fermilab, initially as a post-doctoral student and then as a permanent employee. She is the group leader there.

Act

Together with Alexander Romanenko, she developed a method to reduce the surface resistance in the microwave range of niobium by doping - for example with nitrogen and subsequent electropolishing . This material is used in the superconducting microwave cavity resonators of the accelerators. Even with superconductors, there is a skin effect in the microwave range, since the microwaves and thermal fluctuations can break up the Cooper pairs. The forced oscillations of the electrons generated by the microwaves lead to undesired heat generation in the superconductor. The process introduced by Grassellino and colleagues increases the efficiency of the superconducting structures in the accelerators, measured via the quality factor Q of the cavity resonator, by a factor of three to four. This saves costs for the necessary cooling.

Originally it was believed that the very thin (a few tenths of a nanometer) outer layer of the superconducting niobium metal, which is decisive for the surface resistance, should be pure. Grassellino discovered that doping with nitrogen, for example, was better.

In 2017 she received one of the National Science Foundation's Presidential Early Career Awards. In 2016 she received the IEEE Particle Accelerator Science and Technology Award and in 2017 the EPS Accelerator Group Prize and the USPAS Prize for Achievement in Accelerator Physics and Technology with Alexander Romanenko. In 2013 she became a People's Fellow at Fermilab and in 2014 she received the DOE's Early Career Research Award, endowed with 2.5 million dollars over five years.

She works on the design of the International Linear Collider .

Fonts

  • with A. Romanenko a. a .: Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures, Superconductor Science and Technology, Volume 26, 2013, p. 102001, Arxiv
  • with A. Romanenko a. a .: Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around , Journal of Applied Physics, Volume 115, 2014, p. 184903, Arxiv
  • with A. Romanenko a. a .: Ultra-high quality factors in superconducting niobium cavities in ambient magnetic fields up to 190 mG, Journal of Applied Physics, Volume 105, 2014, p. 234103, Arxiv

Web links

Individual evidence

  1. ↑ Michael Pekeler, Peter Schmüser, Superconductivity for Particle Accelerators, Physik Journal 2006, No. 3, Online
  2. ↑ Fermilab 2014
  3. ↑ Grassellino is listed among the numerous authors on the 2007 Design Report, Arxiv
personal data
SURNAME Grassellino, Anna
BRIEF DESCRIPTION Italian electrical engineer
DATE OF BIRTH 20th century
PLACE OF BIRTH Marsala