Speaker
Dr
Animesh Jain
(Brookhaven National Laboratory, USA)
Description
Field quality in accelerator magnets is expressed in terms of harmonic coefficients
in a Fourier series, which are typically measured under DC conditions using a
rotating coil. The technique of rotating coils has also been extended to
measurements under AC conditions, but only for relatively slow ramps (well below
0.1
T/s). Currently, there is no well established technique for measuring all the
field
harmonics at very high ramp rates (1 T/s and above). We have developed a prototype
system to characterize the field quality of magnets at very high ramp rates. This
new measurement system consists of 16 printed circuit tangential windings which are
held stationary while the magnet is ramped. The induced signals in all the
windings
are then analyzed to obtain the field harmonics. This paper will describe the data
analysis procedure, and present the results of measurements at ramp rates of 1.5 to
4.0 T/s in a prototype dipole designed and built at BNL for operation at such high
ramp rates.
Author
Dr
Animesh Jain
(Brookhaven National Laboratory, USA)
Co-authors
Mr
Andrew Marone
(Brookhaven National Laboratory, USA)
Mr
George Ganetis
(Brookhaven National Laboratory, USA)
Dr
Peter Wanderer
(Brookhaven National Laboratory, USA)
Dr
Richard Thomas
(Brookhaven National Laboratory, USA)
Mr
Wing Louie
(Brookhaven National Laboratory, USA)
