First TPC: The Agony and the Ecstasy · 2014-05-03 · First TPC:The Agony and the Ecstasy. Lina...
Transcript of First TPC: The Agony and the Ecstasy · 2014-05-03 · First TPC:The Agony and the Ecstasy. Lina...
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1First TPC:The Agony and the Ecstasy. Lina Galtieri. Nygren Symposium 03/05/14
First TPC: The Agony and the Ecstasy
The road to physics results was not that easy!!!
● Aug-1980: Superconducting Magnet failure: replace with conventional coil, reduce Momentum resolution by factor 15/3.9=3.8
● Aug-1981 Cosmic ray test: large distortions due to inhomogeneities in the field cages (of order of mm)
● Corrections were evaluated and applied as a ● function of sector and wire number
● May-1982 First beam running: charge build-up due to positive ions. (of order cm)
● Gated grid was used to avoid this problem● Momentum resolution further degraded
Wire number
Distortions (cm)
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2First TPC:The Agony and the Ecstasy. Lina Galtieri. Nygren Symposium 03/05/14
PEP4-TPC Performance● 1982-1983 data
DE/dx resolution 3.7%
13 tracks 12 identified, 1 uncertain
● After Fall 1984:● Fixed distortions:
Field cage coating, gated grid● SC magnet installed:
much better momentum resolution and are separated
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3First TPC:The Agony and the Ecstasy. Lina Galtieri. Nygren Symposium 03/05/14
Physics results1984 First physics papers (20 published papers by Jan 1985) Search for Charge 4/3 particles (John Huth’s thesis) Charge Hadron production (Nick Hadley’s thesis) Tau lepton branching ratios (Bill Moses’s thesis) Strangeness Correlation {Marjorie’s thesis) Prompt electrons from b and c quarks (Hiro’s thesis) Parton fragmentaion in 3 jet events (Bill Gary’s thesis)
Discovery of the F* (now DS) meson (Ryoji Enomoto’s thesis)
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4First TPC:The Agony and the Ecstasy. Lina Galtieri. Nygren Symposium 03/05/14
PEP4-TPC