Speaker
Mr
Michael Hahn
(ACTING HEAD OF ESRF VACUUM GROUP)
Description
The ESRF Vacuum Group uses a number of analysis tools to identify vacuum failures or
irregularities by systematic study of not only total and partial pressure data but
also by looking into relation with machine data of the Storage ring such as beam
emittance, gap opening of Insertion Devices, temperatures, Bremsstrahlung and many
more. The storage of all these values in a common database allows to use
systematically additional information to conclude for example on the behaviour of
low conductance chambers where the pressure readout at the extremities is not
representative. A Labview application has been developed allowing a quick comparison
of the actual vacuum data to a known “good” situation from the past stored in the
Historical Data Base. These relative measurements have an advantage over absolute
ones when one needs to conclude on qualitative behavior of complex devices such as
In Vacuum Undulators. These techniques made it possible that even in the presence of
more and more corrosion leaks the scheduled user operation was not disturbed by
downtime due to Vacuum for several years now: The early identification of problems
allowed to cure them temporary during Machine Dedicated Time and finally change the
faulty elements during programmed Machine Shutdowns.
Author
Mr
Michael Hahn
(ACTING HEAD OF ESRF VACUUM GROUP)
