VIVITRON 1995 report

Autor: B. Heusch
Rok vydání: 1996
Předmět:
Zdroj: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 382:32-36
ISSN: 0168-9002
DOI: 10.1016/s0168-9002(96)00397-x
Popis: Among all electrostatic accelerators the VIVITRON can be considered as the most innovating machine since the development of the large tandems in the 1960s. For its design it can be considered as an ensemble of new ideas [M. Letournel et al., IEEE Particle Accelerator Conf., Washington, March 1987, p. 346] developed progressively to increase the operating maximal potential of the MPs to 16 and even 18 MV as has been successfully demonstrated on the Strasbourg HVEC-MP10. Due to these brand new developments its construction took 6 years (November 1984 to December 1990) before one could start the electrostatic generator tests. The two first years showed however drastic limitations overshadowed by a serious gas pollution which resulted in a total stop of nearly one year for repairs! In 1993 we installed the accelerator tubes whose presence play an important dynamical role in contrast to all other machines. After the very first beam of 12C accelerated in August 1993 we developed all the necessary protections which we studied theoretically and experimentally in a small CN machine, and together with the new beam stabilizing devices. Since July 1994 the machine has been used for experiments using mainly EUROGAM the large European γ-ray study set-up, with beams ranging from lithium to chlorine and voltages up to 20 MV. This value is actually the upper limit we allowed for safe running. Other developments are under study to reach the same reliability for terminal potentials ranging from 20 to 30 MV. Unfortunately recent unexpected belt production problems led us to an important interruption of the machine operation; even today these problems are only partially resolved.
Databáze: OpenAIRE
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