Archives of the North Area 3 Experiment (NA3)

Identity Statement [Top]

Reference code(s)



Archives of the North Area 3 Experiment (NA3)


July 1974 – March 1986

Level of description


Extent of the unit of description

25 Items, 2 linear meters, 13 boxes

Context [Top]

Name of creator

NA3 Collaboration

Administrative history

The NA3 Experiment was set-up on the North Area of the Super Proton Synchrotron (SPS) by the CERN/Ecole Polytechnique/College de France/Orsay/Saclay Collaboration, to study high transverse momentum leptons and hadrons from hadron collisions.

The NA3 Hadronic production of high pTT leptons and hadrons was approved 12 March 1975 and finished 23 March 1994 with the research programme on SPS (H8 beam). The spokesperson was Aldo Michelini. More information:

Michelini joined CERN in 1960, following a series of experiments with tracking chambers, including some time with Jack Steinberger’s group in Columbia.

At CERN, he first worked on the CERN Wilson chamber.

In 1964 he led a CERN/ETH Zurich/Imperial College London collaboration studying strong interactions using a then novel approach, spark chambers in a large magnet.

In 1969 he led the Omega spectrometer project, a general purpose spectrometer initially equipped with optical spark chambers and downstream Cerenkov counters.

In 1973 Michelini became responsible for a group studying a general purpose spectrometer for the SPS North Area. This led to the NA3 experiment whose valuable measurements included production of (DrellYan) muon pairs and of direct photons.

Following the success of NA3, he became spokesman of the OPAL experiment at the LEP electron—positron collider in 1981.

He retired from CERN in 1995.

CERN Bulletin N°7 February 1985,
CERN Courier November 1975,
CERN Courier December 1995.

Immediate source of acquisition or transfer

Received from Aldo Michelini in March 2007.

Content & Structure [Top]

Scope and content

The documents in this collection were created or compiled by NA3 Collaboration and Aldo Michelini during the years 1974-1986.

The collection includes: Letters, drawings, seminars, talks, theses, publications and memos

Appraisal, destruction and scheduling information

Nothing was destroyed.


No further accruals are expected.

System of arrangement

All items have been kept in the order in which they were received from NA3 Collaboration.

Conditions of access and use [Top]

Conditions governing access

See file level description and the CERN operational circular No 3: rules applicable to archival material and archiving at CERN. In general, records on any subject that are over 30 years old, and all records of a purely scientific nature, may be consulted.

Conditions governing reproduction

Copyright is retained by CERN, no reproduction without permission.

Language / scripts of material

Most of the material is written in English and French.

Finding aids

Listed to file level in the CERN Archives Database.

Description control [Top]

Archivist's note

Description prepared by Céline-Aurore Besençon

Date(s) of description

Geneva, the 3rd December 2018