The Mark III vertex chamber

J. Adler, T. Bolton, K. Bunnell, R. Cassell, E. Cheu, R. Eisele, T. Freese, C. Grab, G. Mazaheri, R. Mir, A. Odian, D. Pitman, W. Stockhausen, W. Toki, F. Villa, W. Wadley, S. Wasserbaech, W. Wisniewski

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We have constructed and installed a pressurized straw vertex chamber in the Mark III experiment at the SLAC e+e- storage ring SPEAR. The chamber consists of 12 concentric layers of straws, arrayed at radii between 5.4 cm and 13.0 cm from the interaction point. There are a total of 640 straws, each 8 mm in diameter and 84 cm long. We obtain an overall spatial resolution of 49 μm for argon-ethane ( 50% 50%) at 3 atm absolute using a cosmic ray data sample. The effects of gases on various chamber materials have been investigated. Chamber lifetime studies have been performed. A prototype chamber was used to study the resolution obtained with various gases.

Original languageEnglish (US)
Pages (from-to)42-52
Number of pages11
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1-2
StatePublished - Mar 15 1989

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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