= Bubble-chamber pressure cycle
Reduce <pressure> before beam arrival; photograph bubbles from several views, then recompress.<How It Works: Bubble Chamber (CERN teaching archive)>[How it works, sequence]{ref}
Unlike the <Blackett-Occhialini triggered cloud-chamber experiment>, Glaser used counter-controlled flashes after expansion. A <detector trigger> can select recording in sensitive <liquid>; subsequent expansion cannot recover a vanished latent track.<Elementary Particles and Bubble Chambers by Donald Arthur Glaser>[pp. 537, 541, 550: timing distinction]{ref}
\Image[/bubble-chamber-pressure-and-beam-cycle.png]
{title=<Bubble-chamber pressure cycle> and photographic readout}
{description=Original functional diagram with an arbitrary time coordinate and chosen normalized pressure levels. The dashed equilibrium line assumes fixed temperature; no measured waveform, apparatus scale or historical delay is reproduced.}
The diagram deliberately separates the preparation through <thermodynamics> from the readout decision. Its green interval is a stipulated operating window, not a prediction from <pressure> alone. Excess <superheating> can increase unwanted <nucleation>; insufficient <superheating> can suppress tracks. A useful proposed sensitivity check holds the readout settings fixed while varying <pressure> or <temperature>, with matched background exposures. A proposed timing check moves the beam within the cycle; a proposed optical check varies flash delay to distinguish growing bubbles from changes in <spatial resolution>. These are experimental design examples, not additional historical measurements.
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