Αποτελέσματα Αναζήτησης
1 Ιουλ 1995 · Pressures in the low 10 −12 Torr range are produced by a 200 °C bakeout with a turbomolecular pumping system. A small molecular drag pump in conjunction with the membrane pump turns out to be an effective means of achieving low backing pressures.
1 Μαΐ 2008 · Effects that are induced by vacuum instrumentation need to be reduced in order to obtain accurate pressure measurements. This paper presents the current status of the CEBAF DC photogun. This state of the art technology is driving the need for Extreme High Vacuum (XHV).
d conditioning techniques, vacuum pumps, vacuum instrumentation and vacuum controls. This article highlights key scientific and technical advances driven by the necessity for appropriate vacuum environments for accelerating particle beams, for heating and confining high-temperature plasmas, and for maintaining laser interferomet.
2.1.2 Pumping speed In vacuum technology, a pump is any object that removes gas molecules from the gas phase. A vacuum pump is characterized by its pumping speed S, which is defined as the ratio between the pumped gas flow Q P (pump throughput) and the pump inlet pressure P : S Q P P. (16)
EXTREME HIGH VACUUM. P.A. Redhead. National Research Council Ottawa, Canada. Abstract. Methods for producing and measuring extreme high vacuum (XHV, which is the pressure range below 10-10 Pa) and the limits on measurement and production are examined.
PROFILE: 3.5 m-long, pumped by 2 cartridges (200 l/s each), and 1 ion-pump (45 l/s). Machine development – NEG-coated CV3s: both the SOLEIL and “ESRF-2” extrusions, with no lumped pumps, have been coated in house. They have performed remarkably in terms of prompt vacuum conditionings and low bremsstrahlung rates.
4 Φεβ 2011 · QE decay of NEA GaAs photocathode in ultra/extreme high vacuum (≲10-9Pa) is dominant by ion back bombardment. The only way to eliminate ion back bom-bardment is improving base pressure. Charge density 1/e lifetime was estimated 2x105 Coulomb/cm2 (~E-9 Pa) by JLAB group. 1. =.
