Abstract
At CERN Geneva, two kilometers of UHV at 10−10 torr is in daily use at the Intersecting Storage Ring (ISR) facility. An appreciable fraction of the stainless steel vacuum chamber, some 200 m in fact, is continuously at 10−11 torr. Nature, we have been told, abhors a vacuum. Nature, in the guise of 28 GeV protons, persists in her abhorrence even when confronted with the brazen face of modern technology. Beams of many amperes of 28 GeV protons circulate for many hours inside the ISR vacuum chambers. A vacuum of 10−10 torr is essential if the protons are to remain unperturbated by collisions with the residual gas molecules. However, when the beam current is allowed to exceed about 5 A, certain regions of the vacuum chamber surface appear to desorb gas molecules and the pressure rises to values in excess of 10−7 torr. Mechaanisms which might give rise to such pressure increases are discussed along with general problems related to the production and maintenance of large scale UHV systems.
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call