CERN-ARCH-EHS-01 to CERN-ARCH-EHS-05-03
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
Name of creator
European Hybrid Spectrometer (EHS) collaboration
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
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).
(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 Rapid Cycling Bubble Chamber (RCBC) documents
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.
Listed to file level in the CERN Archive database.
Description prepared by Sandrine Reyes
Date(s) of description: Geneva, the 12th May 2004, Revised 2007