Pressure stability under a pump failure | Zendy

S. Heifets | Zendy; J. Seeman | Zendy; W. Stoeffl | Zendy

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Pressure stability under a pump failure

Author(s) -

S. Heifets,

J. Seeman,

W. Stoeffl

Publication year - 1995

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/74093

Subject(s) - beam (structure) , antenna (radio) , power (physics) , thermocouple , tile , stack (abstract data type) , optics , materials science , electrical engineering , current (fluid) , acoustics , nuclear engineering , physics , engineering , composite material , computer science , programming language , quantum mechanics

Ions produced by a beam on the residual gas induce desorption from the beam pipe wall and may lead to a runaway pressure build up. The main mechanism of ion production is usually inelastic collisions of the beam particles. It may not be true for PEP-II where the combination of high energy and high beam current leads to MWs of the total power in synchrotron radiation. The photoeffect on the residual gas may produce more ions than produced in the inelastic collisions due to a much larger cross-section of the photoeffect at low photon energies where the number of photons is maximum.

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