Initial Hebrew letter

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Possible Answers: ALEPH.

Last seen on: LA Times Crossword 14 Jul 19, Sunday

Random information on the term “ALEPH”:

ALEPH was a particle detector at the Large Electron-Positron collider (LEP). It was designed to explore the physics predicted by the Standard Model and to search for physics beyond it.

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The ALEPH detector was built to measure events created by electron positron collisions in LEP. It operated from 1989 to 1995 in the energy range of the Z particle (around 91 GeV) and later (1995 to 2000) above the threshold of W pair production (up to 200 GeV). Typical events have many particles distributed in jets over the entire detector volume. The event rate ranged from around 1 Hz at the peak of the Z to at least a factor hundred smaller at the highest energies. The ALEPH detector was therefore designed to accumulate, for each event, as much information over as much solid angle as was practical.

This was achieved by a cylindrical arrangement around the beam pipe with the electron-positron interaction point in the middle. A magnetic field of 1.5 Tesla was created by a superconducting coil 6.4 m long and 5.3 m in diameter. The iron return yoke was a dodecagonal cylinder with two end-plates that left holes for a focusing magnet (quadrupole) of the LEP machine. The iron was 1.2 m thick and was subdivided into layers that left space for the insertion of layers of streamer tubes. In this way the iron yoke was a fully instrumented hadron calorimeter (HCAL), which was read out in 4608 projective towers. Outside the iron, there were two double layers of streamer tube chambers to record the position and angle of muons that had penetrated the iron.

ALEPH on Wikipedia