CERN LHC Project Report 109 (1997),
presented at the IEEE Particle Accelerator Conference (session 7V-31), Vancouver, 1997
An Impedance Data Base Program for LEP2 and the LHC
O. Brüning
May 1997
Abstract:
The development of
an impedance data base program was motivated by the changing impedance
budgets in the LEP and LHC machines and the resulting need to
recalculate the instability thresholds for different parameters.
For LEP, the changes are implied by
the LEP2 upgrade and for the LHC, the impedance data for most items
is still being calculated and continues to change
as the geometries of the impedance
components converge to a final design.
In both cases, feedback from the impedance calculations is desirable.
A central data base that allows a semi-automatic recalculation of the impedance
data once the geometry of an item changes facilitates such a feedback.
The development of the program was guided by
four goals.
First, the data base program should collect the
impedance information in a central place and in a standard format
allowing easy access.
Second, it should provide
procedures for estimating
the impact of the impedance on the beam dynamics.
Third, the program should provide a user friendly graphical interface to the
data base and all external programs that are used for calculating the
impedance data.
Fourth, it should store
the input files
for the external programs
allowing a semi-automatic
recalculation of the impedance data
once the geometry of an item changes.
F. Ruggiero
Mon May 26 17:11:35 1997