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In memory of Sergey Stark

Dr. Sergey Stark worked in Legnaro for 25 years, from 1991 to 2014, in the field of the realization of superconducting cavities with the technique of niobium sputtering onto copper. The original development of DC-biased-sputtering technology in Legnaro, under the initial guidance of prof. Vincenzo Palmieri, allowed the realization of the first quarter-wave cavities (QWR) by means of Nb-sputtering in the world, with operational performances that are completely comparable to those made of niobium plate.
In the first period (1991-1998), Sergey progressively perfected the sputtering procedures. Subsequently (from 1999 to 2003) he was the protagonist of the great project with which more than 70 QWRs were realized by means of Nb-sputtering: these resonators are in operation on the ALPI linac, with no major improvement measures ever since. In the same period, he set up a system of automatic characterization of superconducting cavities, applied to the QWR but of universal value, which had an international echo. Since 2004, he has given a fundamental contribution in guaranteeing maintenance and functionality of ALPI and PIAVE linacs, contributing in a passionate way to the understanding and solving problems in different disciplines, such as control systems, radiofrequency, vacuum technologies, cryogenics and cryostats. For the superconducting RFQs of PIAVE, in particular, he realized in this period the large Nb-sputtered Cu plates. In synergy with the staff of our mechanical workshop, he eventually perfected the geometry of QWR’s, with beam ports obtained by plastic deformation: an innovation which was then successfully resumed in other laboratories and which further improved their performance.
In 2014, he chose to move to the FRIB project at Michigan State University (USA), where his ideas and talents were further developed.
Sergey was a born researcher, who loved experimenting and innovating. He was a creative researcher, with knowledge ranging among the most diverse fields of technological research: superconductivity, cryogenics, electronics, automation, chemistry, electrochemistry, radiofrequency, mechanics, vacuum, computer science. He knew how to move in every field, and, through his remarkable technical skills realize his ideas by himself. He was meticulous in implementing everything he considered important. A tireless worker, he demanded a lot from himself. He was a sensitive and shy person, who loved doing more than promising. Focused on the goal to be achieved, he could seem obsessive in the precision and, in the way, he requested a job. However, he was extremely caring and generous with colleagues and associates, and was always willing to make his deep and diverse experience available to anyone who wanted his help.
His contribution to the activities of the National Laboratories of Legnaro will never be forgotten.

Memory by INFN LNL (english version)

Ricordo del personale dei LNL (versione italiana)

Ricordo di Anna Maria Porcellato

Ricordo di Silvia De Ambrosis e Giulia Lanza

Ricordo di Antonio Rossi


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Mn-51 and Mn-52g for Positron Emission Tomography Imaging
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