Herwig Schopper

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Herwig Schopper
Prof. Herwig Schopper was the Director General of CERN (1981-1988).jpg
Schopper in 1982
Born (1924-02-28) 28 February 1924 (age 100)
Alma mater University of Hamburg
Known forFirst polarised proton beam
Circular polarisation of gamma-rays following beta decay
Hadron calorimeter
Superconducting cavities
High energy e-p scattering
AwardsCarus Medal of the Academy of Sciences Leopoldina (1957) [1]
Order of Friendship of the Russian Federation (1996)
Great Cross of Merit of the Federal Republic Germany (1989)
Grand Cordon of the Order of Independence (2003)
UNESCO Albert Einstein Gold Medal (2004)
UNESCO Niels Bohr Gold Medal (2005)
AAAS Award for Science Diplomacy (2019) [2]
Scientific career
Fields Optics
Nuclear physics
Particle physics
Accelerator technology
Institutions DESY
CERN
SESAME
University of Erlangen
University of Mainz
University of Karlsruhe
University of Hamburg
Doctoral advisor Wilhelm Lenz, Rudolf Fleischmann

Herwig Franz Schopper (born 28 February 1924) is a German experimental physicist. He was the director general of CERN from 1981 to 1988. [3] [4]

Contents

Biography

Schopper was born in Lanškroun, Czechoslovakia, to a family of Austrian descent. He obtained his diploma and doctorate from the University of Hamburg, studying under Wilhelm Lenz and Rudolf Fleischmann. In 1950–51 he was a research assistant with Lise Meitner at Stockholm and in 1956–57 at the Cavendish Laboratory under Otto Robert Frisch. [5] [6]

During these fellowships, Schopper worked on nuclear physics and contributed substantially to the evidence of parity violation in weak interactions. He measured the circular polarization of gamma rays following a beta decay, thought unfeasible by Lee and Yang, [7] and showed in the same experiment that the helicities of neutrino and antineutrino are opposite. Later, he was involved in an experiment to test time reversal symmetry. [8] In 1956, he followed Fleischmann to the University of Erlangen where he continued to do research in optics and solid-state physics, with emphasis on thin metal layers, which he had started at Hamburg. Also he developed, along with Clausnitzer, the first source of polarised protons. [9] In 1957 he became Privatdozent at the University of Erlangen. [6]

From 1958 to 1961, Schopper was an associate professor at the University of Mainz where he established the Institute for Experimental Nuclear Physics. In 1960–61 he worked under Robert R. Wilson at Cornell University to be introduced to elementary particle physics, namely the use of electron scattering to study the structure of the proton and neutron. [10]

Schopper was appointed professor at the University of Karlsruhe in 1961 and director of the newly established Institutes for Experimental Nuclear Physics of TH Karlsruhe and the Karlsruhe Nuclear Research Centre. [11] In order to continue his research on electron scattering he set up a group to carry out one of the first experiments at DESY. He also created a group at CERN to investigate neutron scattering at high energies at the Proton Synchrotron (PS) and Intersecting Storage Rings (ISR). These experiments where then continued at the Institute for High Energy Physics (IHEP) in Serpukhov, Russia. The group made important contributions to the study of neutron-proton and neutron-nuclei scattering cross sections. [12] For this purpose, the first hadron calorimeter was developed and optimised by Monte Carlo simulations. [13] Another group at Karlsruhe developed the first superconducting high frequency cavities in Europe, a technology which was transferred to CERN for particle separators and later for particle acceleration at LEP.

At CERN, he was a research associate in 1966–67, became division leader of the Nuclear Physics Division in 1970, member of the directorate responsible for the co-ordination of the experimental programme until 1973 and chairman of the ISR Committee from 1973 to 1976. [14]

In 1973 Schopper became professor at the University of Hamburg and the chairman of the directorate of DESY, serving until end of 1980. [4] He was responsible for the installation of the ARGUS detector at DORIS which later resulted in the first evidence of B – B bar mixing. [15] Also, by establishing HASYLAB at DORIS synchrotron light science became an important branch of research at DESY. He proposed and completed the construction of the electron-positron collider PETRA which led to the discovery and study of the gluon. [16] [17] During his mandate, DESY, a national laboratory became as far as science was concerned an international particle physics laboratory. This included the start of the first collaboration with China.

From 1977 to 1979, Schopper was chairman of the Association of the German Large Research Centres (now Helmholtz Association) and member of various advisory bodies of the Federal Ministry of Research, the Deutsche Forschungs Gemeinschaft and the Max Planck Society. [6]

After being member of the Scientific Policy Committee at CERN, Schopper was elected director general and served from 1981 to 1988. [18] [6] His first task was to unite the two CERN laboratories existing at that time under two Directors General. The Large Electron–Positron Collider (LEP) was also proposed and constructed under his leadership. This facility allowed the verification of the standard model of particle physics, namely that it is a renormalizable field theory, leading to the award of the Nobel Prize to the theoreticians Veltman and t'Hooft. Furthermore, it enabled the precise determination of fundamental parameters of the electroweak force, such as the W± and Z masses, and proved the existence of three neutrino families. [19] Thus, this particle accelerator transformed high energy physics into a field of precision measurements and provided estimates to the mass of the top quark, Higgs boson and other supersymmetric and hypothetical particles. LEP was approved under the condition of a reduced and constant budget with the consequence that some unique activities at CERN (e.g. ISR) had to be abandoned. Schopper was obliged to introduce a new way of international collaboration for the four LEP experiments since CERN could not provide funds for them. The experiments became rather independent activities organised in a rather democratic way bringing together hundreds of scientists from many universities and national organisations. [20] The LEP experiments became a model for the later LHC experiments, shaping the way this organization works today. He contributed to the globalisation of research at CERN and was also responsible for the return of Spain and Portugal in the CERN's member states. [21]

Schopper at the Second International Conference on Research and Communications in Physics Conference on RACIP2 Group Photo.jpg
Schopper at the Second International Conference on Research and Communications in Physics

Schopper is professor emeritus at the University of Hamburg since 1989. [4] From 1992 to 1994 he was president of the German Physical Society and president of the European Physical Society in 1995–97. [22] For many years he was member of the scientific council of the Joint Institute for Nuclear Research in Dubna and of the board of trustees of the Max Planck Institute for Plasma Physics in Garching.

At UNESCO, he served as member of the Physics Action Council and chairman of the Working Group on Large Facilities, president of the scientific council of the Regional Office for Science and Technology ROSTE of UNESCO in Venice (2001–2002) and in 2003–2009 he was the chairman of the international advisory committee for the International Basic Science Programs. [23]

Schopper's vision of science without borders resulted in him becoming a founding father of SESAME, the laboratory for Synchrotron-Light for Experimental Science and Applications in the Middle East, which provides an extremely bright light source to investigate a broad range of domains from condensed matter to biology and archeology. [24] In 1999–2008 he became president of the Preliminary International Council and later, after the formal foundation of SESAME, of the International Council. Without his dedication this international research facility would probably not have been built. [25] SESAME was founded analogous to CERN, under the umbrella of UNESCO, with presently nine member states: Bahrain, Cyprus, Egypt, Iran, Israel, Jordan, Pakistan, the Palestinian Authority and Turkey. It provides an environment where countries with different political systems, traditions, religions and mentalities are able to work together peacefully.

Schopper is a founding member of The Cyprus Institute at Nicosia, Cyprus, and since 2000 Member of the board of trustees and was chairman of the Scientific Council and member of the executive committee of the board of trustees of the Cyprus Institute. [26]

Currently, he works as an advisor and goodwill ambassador on science for peace. He writes articles about research policy, science and religion and also science and society.

Honours and awards

Honorary academic degrees

Schopper received honorary doctoral degrees from: University of Erlangen (1982), [27] Moscow State University (1988), [28] University of Geneva (1989), [29] University of London, Joint Institute for Nuclear Research (Dubna) (1999), [30] Institute for High Energy Physics (Protvino), The Cyprus Institute (Nicosia) (2018) [31] and the Karlsruhe Institute of Technology (KIT) (2024). [32] [33]

Awards

Memberships

Publications and books

Scientific publications

Schopper wrote more than 200 original publications in optics, nuclear physics, elementary particle physics and accelerator technology. Some of the most important works are:

Books

See also

Related Research Articles

<span class="mw-page-title-main">Particle physics</span> Study of subatomic particles and forces

Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combination of protons and neutrons is called nuclear physics.

<span class="mw-page-title-main">CERN</span> European research centre in Switzerland

The European Organization for Nuclear Research, known as CERN, is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in Meyrin, western suburb of Geneva, on the France–Switzerland border. It comprises 24 member states. Israel, admitted in 2013, is the only non-European full member. CERN is an official United Nations General Assembly observer.

<span class="mw-page-title-main">DESY</span> German national research center

DESY, short for Deutsches Elektronen-Synchrotron, is a national research centre for fundamental science located in Hamburg and Zeuthen near Berlin in Germany. It operates particle accelerators used to investigate the structure, dynamics and function of matter, and conducts a broad spectrum of interdisciplinary scientific research in four main areas: particle and high energy physics; photon science; astroparticle physics; and the development, construction and operation of particle accelerators. Its name refers to its first project, an electron synchrotron. DESY is publicly financed by the Federal Republic of Germany and the Federal States of Hamburg and Brandenburg and is a member of the Helmholtz Association.

<span class="mw-page-title-main">Large Electron–Positron Collider</span> Particle accelerator at CERN, Switzerland

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<span class="mw-page-title-main">Gargamelle</span> CERN Bubble chamber particle detector

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Business positions
Preceded by
Léon Van Hove and John Adams (co-directors)
CERN Director General
1981 1988
Succeeded by