Archives of European Hybrid Spectrometer - Rapid Cycling Bubble Chamber, EHS-RCBC

Identity Statement [Top]

Reference code(s)



Archives of European Hybrid Spectrometer - Rapid Cycling Bubble Chamber, EHS-RCBC


1978 - 1984

Level of description


Extent of the unit of description

40 items, 15 boxes, 2 linear metres

Context [Top]

Name of creator

European Hybrid Spectrometer (EHS) collaboration

Administrative history

CERN's European Hybrid Spectrometer (EHS), accepted by the Super Proton Sychrotron Committee (SPSC) in 1976, and installed in the North Experimental Area in 1977, consisted of a Rapid Cycling Bubble Chamber as the target and a series of particle detectors which extend the experiment around and behind the bubble chamber. The EHS aimed to integrate the technologies of bubble chambers and spectrometers in such a way as to maximize the advantages of each technique and minimize the inconveniences.

The parts of EHS were built by different European Groups. Rutherford Laboratory constructed the Bubble Chamber, Saclay its magnet and the CERN EF (Experimental Physic Facilities) and DD (Data Handling) divisions were responsible for the project coordination and for the computers. Dutch and Austrian groups built some of the particle detectors.

EHS was started as a project by Lucien Montanet in 1975 in Physics II Department - Track Chamber (TC) division, which later became the Experimental Physics (EP) division. He was senior physicist and spokesperson for the whole EHS collaboration.

EHS is a general facility, a detector to be used by several divisions and teams like Gargamelle, Omega, BEBC, 2m Bubble Chamber - an interdivisional collaboration:

  • with Experimental Physics Facilities (EF) division (Dietrich Güsewell was responsible for the construction and for financial aspects of the detector),
  • with Data Handling (DD) division with Brian Powell and others for analysis of data provided by the detectors of EHS. The Rapid Cycling Bubble Chamber (RCBC) was one of the vertex detectors in EHS built by Heinrich Leutz - Experimental Physic Facilities Division (EF).

In 1984 EHS was operated with the LExan Bubble Chamber (LEBC), sometimes also referred to as HOLEBC, HO standing for High Optical resolution.

In 1985 many of the former EHS spectrometer's detectors, but not ISIS (Identification of Secondaries by Ionization Sampling) and SAD (Silica Aerogel Detector), were rearranged to install a new experiment, NA36.

Running experiments stopped in 1989; publication of results continued until October 1992.

Immediate source of acquisition or transfer

Lucien Montanet, Dietrich Güsewell, Adolf MMinte, Gert Harigel

Content & Structure [Top]

Scope and content

The bubble chamber itself was quite a small device, about 80 cm diameter and 40 cm deep, with a volume of 300 litres using the Scothlite technology and a superconducting magnet giving a field of 3 tesla. It was a Rapid Cycling Bubble Chamber working at 30 Hz repetition rate, i.e. 100 times faster than BEBC (Big European Bubble Chamber).

* Source: See 1977 CERN Annual Report p 85.

This collection contains reports, correspondence, memoranda, notes, and workshop and programme files.

Appraisal, destruction and scheduling information

Nothing was destroyed.


No further accruals are expected.

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-EHS-01 Physics (PH) reports
CERN-ARCH-EHS-02 Technical (TE) reports
CERN-ARCH-EHS-03 Construction Committee (CC) reports
CERN-ARCH-EHS-04 Administration and General
CERN-ARCH-EHS-05 RCBC documents

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.

Finding aids

Listed to file level in the CERN Archives Database.

Description control [Top]

Archivist's note

Description prepared by Sandrine Reyes.

Date(s) of description

Geneva, the 12th May 2004, Revised 2007.