نتایج جستجو برای: drift chamber
تعداد نتایج: 72761 فیلتر نتایج به سال:
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The control of a nanometer-wide gap between tip and substrate is critical for nanoscale applications of scanning electrochemical microscopy (SECM). Here, we demonstrate that the stability of the nanogap in ambient conditions is significantly compromised by the thermal expansion and contraction of components of an SECM stage upon a temperature change and can be dramatically improved by suppressi...
A vertex chamber for MAC was proposed in fall 1983 to increase precision in the measurement of the B hadron and 7 lepton lifetimes. The chamber had to be placed within the existing central drift chamber, making access for repairs difficult and costly. We therefore used for detector elements thin-walled aluminized mylar drift tubes (“straws”) because of their simplicity and robustness. lp2 The d...
submitted to the Xth VCI 2004 30 November 2003 This BaBar L1 DCT upgrade is essential for improving L1 trigger background rejection in preparation for the expected increase in PEP-II luminosity. A large fraction of the current L1 trigger background come from interactions of beam particles with beam line components at ∼ ±20 cm from the interaction point (IP), along the beam direction (z axis). T...
A multiwire propor t ional chamber , with a high-densi ty drift space at tached, has been developed as a posit ion-sensit ive detector for nonioniz ing radiat ion. A chamber with a 5 g /cm a d r i f t s p a c e , compris ing a l eadb i smuth matr ix o f 1 m m square holes on a 1.5 m m pi tch has been investigated. For 0.66 MeV pho tons a detection efficiency o f 5%, combined with a spatial reso...
We have added a high precision drift chamber to the Mark II detector at PEP. The design of the device has been optimized for measuring vertex topologies as accurately as possible. This has involved placing wires within 10 cm of the beam line, using a beryllium beam pipe as the inner gas wall of the chamber, and improving the accuracy of the drift-time measurement. The chamber operates reliably ...
We present the results of the first measurements in a study of drift chamber performance in very strong magnetic fields. The angle of the electron drift has been measured as a function of electric and magnetic field intensity for an argon-iso-butane-methylal gas mixture. Fields up to 5500 V/cm and 4.5 T have been studied. 1. Introduction The next generation of high energy accelerators (ISABELLE...
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