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 Incoming links: Simon van der Meer

Nobel Prize in Physics in 1984 2026-10-18

Awarded in equal shares to Carlo Rubbia and Simon van der Meer for decisive contributions to the project that discovered the

W

and

Z

particles mediating the weak interaction.^[ref]

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Stochastic cooling 2026-10-18

Simon van der Meer's stochastic cooling uses measured beam fluctuations, a pick-up, amplifier and timed kicker. Finite samples supply the signal; other particles and electronic noise contribute unwanted kicks. Delay and oscillation phase must make the correction oppose the sampled deviation.^[ref]

This active system dissipates energy; it is no one-particle Maxwell's demon individually tracking antiprotons. The stochastic cooling variance model isolates the tradeoff.

Figure 1.
Measured beam fluctuations drive a delayed kicker, while excessive gain amplifies noise
. Original functional signal path, not a mechanical or scale drawing of a historical ring. Beam flight and electrical signal paths are distinct; phase and delay must make the correction oppose the sampled deviation. The graph is the stipulated scalar model with initial variance one and independent noise variance one quarter; it is not a measured cooling curve. Details.

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