CERN-ARCH-LEP-01-001 to 06-017
Large Electron Positron Collider (LEP) Division and LEP Experiments Committee
1978 - 2000
Level of description
Extent of the unit of description
73 Boxes, 129 items, 8 linear metres
Name of creator
Large Electron Positron Collider Division, LEP
- 1976 : Start of LEP design studies
- 1978 : First practical design was published
- 1981 : Council approved construction for an initial operating energy of 50 GeV per beam; Emilio Picasso named as LEP Project Director until 1989
- 1983 : Ground-breaking ceremony for LEP; G. Plass named as LEP Division Leader until 1989
- 1989 : Inauguration of LEP
- 1990 : G. Plass named as Director of Accelerators, and L. R. Evans became SL (LEP+SPS) Division Leader
- 1994 : K. H. Kissler became the new SL (LEP+SPS) Division leader
- 1996 : LEP energy is increased to allow production of pairs of W particles (140 GeV)
- 2000 : LEP accelerator, achieving a collision energy of 209 GeV, closed in November. S. Myers became the new SL (LEP+SPS) Division leader until 2002.
Immediate source of acquisition or transfer
Roger Calder in July 1993 and the Libray in 2004
Scope and content
The Large Electron Positron Collider, LEP, is a particle accelerator built inside a circular tunnel 27km round and buried 100 metres underground. At four points around the accelerator, huge detectors called ALEPH (Apparatus for LEp PHysics), DELPHI (DEtector with Lepton, Photon and Hadron Identification), L3 and OPAL (Omni Purpose Apparatus for Lep) studied what happened when electrons and their antimatter counterparts, positrons, collided at high energy.
LEP was switched on in the summer of 1989. For six years, its job was to produce Z particles, carriers of one of nature's fundamental forces. The Z was first discovered in a Nobel Prize winning CERN experiment in 1983. Z particles had been made at LEP when electrons and positrons collided with enough energy to provide their mass, around 91 GeV.
In 1995, LEP's Z era came to an end, the machine moved up a gear to 140 GeV ready for LEP's second phase which pushed the energy to over 190 GeV before the end of the decade. Known as LEP2, this second phase of LEP was to produce and study W particles, companions of the Z, which were also discovered at CERN in 1983.
LEP stopped in November 2000, but the analysis of data is still going on, with the possibility of discovering new physics phenomena.
It was dismantled in 2001 to give way to the Large Hadron Collider LHC.
LEP collection contains minutes of LPC (LEP Project Committee), LMAC ( LEP Machine Advisory Committee), MARTEC (Main Ring Technical Committee), Group Leader's meetings, LEP Management Board (LMB), reports and notes.
Appraisal, destruction and scheduling information
Nothing was destroyed.
Further accruals may be received.
System of arrangement
The original order has been preserved. For the purposes of cataloguing the files have been described according to the following plan:
CERN-ARCH-LEP-01 Administration and general CERN-ARCH-LEP-02 Safety CERN-ARCH-LEP-03 Committees and Working Group CERN-ARCH-LEP-04 LEP Reports and notes CERN-ARCH-LEP-05 LEPC Reports CERN-ARCH-LEP-06 Other LEP Committees
Conditions governing access
See file level description and the CERN operational circular No 3: rules applicable to archival material and archiving at CERN.
Conditions governing reproduction
Copyright is retained by CERN, no reproduction without permission.
Language / scripts of material
Most of the material is written in English or French.
Listed to file level in the CERN Archive database.
Description prepared by Maryse Moskofian
Date(s) of description: Geneva, 10th September 2003, Revised 2007.