Detector of internally-reflected Cherenkov light

Detector of internally-reflected Cherenkov light

The Detector of Internally Reflected Čerenkov light (DIRC) was first proposed by Blair Ratcliff as a tool for particle ID at a B-Factory. As a particle traveling close to the speed of light passes through the quartz it emits Čerenkov radiation, provided that n eta > 1 (where "n" is the index of refraction in the quartz and eta = frac{v}{c} is proportional to the particle's velocity). This radiation is transmitted through internal reflections to a stand-off box which contains photomultipliers. Knowledge of the angle at which the radiation was produced, combined with the track angle and the particle's momentum (measured in a drift chamber) may be used to calculate the particle's mass.

The DIRC differs from earlier RICH and CRID Cherenkov light detectors in that the quartz bars used as radiators also transmit the light. The design was first used by the BaBar Collaboration at SLAC.


* [ BaBar DIRC homepage]

Wikimedia Foundation. 2010.

См. также в других словарях:

  • Detection of internally reflected Cherenkov light — In particle physics experiments a Detection of Internally Reflected Cherenkov light (DIRC) detector measures the velocity of charged particles and is used for particle identification. It is a design of a Ring imaging Cherenkov detector where… …   Wikipedia

  • BaBar experiment — The BaBar experiment is an international collaboration of more than 550 physicists and engineers studying the subatomic world at energy of approximately ten times the rest mass of a proton. Its design was motivated by the investigation of CP… …   Wikipedia

  • radiation measurement — ▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement.       The term ionizing radiation refers to those… …   Universalium

Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»