Simon van der Meer (24 November 19254 March 2011) was a Dutch particle accelerator physicist who shared the Nobel Prize in Physics in 1984 with Carlo Rubbia for contributions to the

CERN 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 a northwestern suburb of Gene ...

project which led to the discovery of the

W and Z particles In particle physics, the W and Z bosons are vector bosons that are together known as the weak bosons or more generally as the intermediate vector bosons. These elementary particles mediate the weak interaction; the respective symbols are , , and ...

, the two fundamental communicators of the weak interaction.

Biography

One of four children, Simon van der Meer was born and grew up in The Hague, the Netherlands, in a family of teachers. He was educated at the city's gymnasium, graduating in 1943 during the German occupation of the Netherlands. He studied Technical Physics at the Delft University of Technology, and received an

engineer's degree An engineer's degree is an advanced academic degree in engineering which is conferred in Europe, some countries of Latin America, North Africa and a few institutions in the United States. The degree may require a thesis but always requires a non-a ...

in 1952. After working for

Philips Research The Philips Natuurkundig Laboratorium (English translation: ''Philips Physics Laboratory'') or NatLab was the Dutch section of the Philips research department, which did research for the product divisions of that company. Originally located in the ...

Eindhoven Eindhoven () is a city and municipality in the Netherlands, located in the southern province of North Brabant of which it is its largest. With a population of 238,326 on 1 January 2022,CERN 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 a northwestern suburb of Gene ...

in 1956 where he stayed until his retirement in 1990. Van der Meer was a relative of Nobel Prize winner Tjalling Koopmans – they were first cousins once removed. In the mid-1960s, Van der Meer married Catharina M. Koopman; they had a daughter and a son.

Work at CERN

In the 1950s, Van der Meer designed magnets for the 28 GeV

Proton Synchrotron The Proton Synchrotron (PS, sometimes also referred to as CPS) is a particle accelerator at CERN. It is CERN's first synchrotron, beginning its operation in 1959. For a brief period the PS was the world's highest energy particle accelerator. It ...

(PS) In 1961, he invented a pulsed focusing device, known as the ‘Van der Meer horn’. Such devices are necessary for long-base-line neutrino facilities and are used even today. That was followed in the 1960s by the design of a small storage ring for a physics experiment studying the anomalous magnetic moment of the

muon A muon ( ; from the Greek letter mu (μ) used to represent it) is an elementary particle similar to the electron, with an electric charge of −1 '' e'' and a spin of , but with a much greater mass. It is classified as a lepton. As wi ...

. Soon after and in the following decade, Van der Meer did some very innovative work on the regulation and control of powersupplies for the

Intersecting Storage Rings The ISR (standing for "Intersecting Storage Rings") was a particle accelerator at CERN. It was the world's first hadron collider, and ran from 1971 to 1984, with a maximum center of mass energy of 62 GeV. From its initial startup, the collider ...

(ISR) and, later, the

SPS SPS may refer to: Law and government * Agreement on the Application of Sanitary and Phytosanitary Measures of the WTO * NATO Science for Peace and Security * Single Payment Scheme, an EU agricultural subsidy * The Standard Procurement System, fo ...

. Van der Meer's ISR Collider days in the 1970s led to his technique for luminosity calibration of colliding beams, first used at the ISR and still used today at the

LHC The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundre ...

, as well as in other colliders. The Nobel Prize committee recognised Van der Meer's idea of

stochastic cooling Stochastic cooling is a form of particle beam cooling. It is used in some particle accelerators and storage rings to control the emittance of the particle beams in the machine. This process uses the electrical signals that the individual charg ...

and its application at CERN in the late 1970s and 1980s, specifically in the

Antiproton Accumulator The Antiproton Accumulator (AA) was an infrastructure connected to the Proton–Antiproton Collider (SpS) – a modification of the Super Proton Synchrotron (SPS) – at CERN. The AA was built in 1979 and 1980, for the production and accumulati ...

, which supplied antiprotons to the Proton-Antiproton Collider. During his work at the ISR, Van der Meer developed a technique using steering magnets to vertically displace the two colliding beams with respect to each other; this permitted the evaluation of the effective beam height, leading to an evaluation of the beam luminosity at an intersection point. The famous ‘Van der Meer scans’ are indispensable even today in the LHC experiments; without these, the precision of the calibration of the luminosity at the intersection points in the Collider would be much lower. For the new

machine constructed in the early seventies, he proposed that the generation of the reference voltages for the bending and quadrupole supplies should be based on measurements of the field along the cycle, and gave an outline of the correction algorithms. His proposal resulted in the first ever computer-controlled closed-loop system for a geographically distributed system, as the 7 km circumference SPS was; this was a no simple feat for the early 1970s. Measurements of the main magnet currents were introduced only later, when the SPS had to run as a storage ring for the SPS p–pbar collider. Van der Meer's accelerator knowledge and computer programming meant he developed very sophisticated applications and tools to control the antiproton source accelerators as well as the transfer of antiprotons to the SPS Collider for Nobel-winning discoveries. The AA and AC pbar source complex machines remained from 1987 to 1996 the most highly automated set of machines in CERN's repertoire of accelerators.

Nobel prize

Van der Meer invented the technique of

of particle beams. His technique was used to accumulate intense beams of antiprotons for head-on collision with counter-rotating

proton A proton is a stable subatomic particle, symbol , H+, or 1H+ with a positive electric charge of +1 ''e'' elementary charge. Its mass is slightly less than that of a neutron and 1,836 times the mass of an electron (the proton–electron mass ...

beams at 540 GeV centre-of-mass energy or 270 GeV per beam in the

Super Proton Synchrotron The Super Proton Synchrotron (SPS) is a particle accelerator of the synchrotron type at CERN. It is housed in a circular tunnel, in circumference, straddling the border of France and Switzerland near Geneva, Switzerland. History The SPS was de ...

. Such collisions produced W and Z bosons which could be detected for the first time in 1983 by the

UA1 experiment The UA1 experiment (an abbreviation of Underground Area 1) was a high-energy physics experiment that ran at CERN's Proton-Antiproton Collider (SpS), a modification of the one-beam Super Proton Synchrotron (SPS). The data was recorded between ...

, led by Carlo Rubbia. The W and Z bosons had been theoretically predicted some years earlier, and their experimental discovery was considered a significant success for CERN. Van der Meer and Rubbia shared the 1984 Nobel Prize for their decisive contributions to the project. Van der Meer and

Ernest Lawrence Ernest Orlando Lawrence (August 8, 1901 – August 27, 1958) was an American nuclear physicist and winner of the Nobel Prize in Physics in 1939 for his invention of the cyclotron. He is known for his work on uranium-isotope separation f ...

are the only two accelerator physicists who have won the Nobel prize. Apart from his Nobel Prize Van der Meer also became a member of the

Royal Netherlands Academy of Arts and Sciences The Royal Netherlands Academy of Arts and Sciences ( nl, Koninklijke Nederlandse Akademie van Wetenschappen, abbreviated: KNAW) is an organization dedicated to the advancement of science and literature in the Netherlands. The academy is housed ...

in 1984.

References

External links

* including the Nobel Lecture, 8 December 1984 ''Stochastic Cooling and the Accumulation of Antiprotons''
CERN pays tribute to Simon van der Meer
* * {{DEFAULTSORT:van der Meer, Simon 1925 births 2011 deaths Accelerator physicists People associated with CERN Delft University of Technology alumni 20th-century Dutch inventors Dutch Nobel laureates 20th-century Dutch physicists Experimental physicists Members of the Royal Netherlands Academy of Arts and Sciences Nobel laureates in Physics Particle physicists Scientists from The Hague