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.5 Ghz/DIV
Fig. 3, Relative Permittivity and Permeability of NZ-51
References
[1] -The Fermllab Antiproton Source Deafen Report,”
Fermi National Accelerator Laboratory, February
1982,
[2] W.C. Barry, "Mode Analysis of Ferrite Loaded Beam
Pipe,” Lawrence Berkeley Laboratory, LBID-993,
August 1984.
[3] W.C. Barry, ”A Broadband, Automated, StrlpUne
Technique for the Simultaneous Measurement of
Complex Permittivity end Permeability** Lewrence
Berkeley Laboratory, February 1965.
The NZ-51 tiles used in the 2-4 GHz array are
.5 cm thick, i.e. t? » .5 cm in Eqs. (1) and (2). Figure 4
shows the attenuation predicted by Eqs. (1), <2), and (3)
of the dominant mode in the array for four different values
of t]. As can be seen, moving the ferrite tiles off the walls
(increasing t]) brings in a resonant-like structure at
- 2 GHz but has little effect on the attenuation over the
rest of the .5-5.5 GHz band. Because of the beam
emittance at the location of the 2-4 GHz array in the
debencher, the value of t], cannot exceed 2 cm. In view
of this requirement, and the insensitivity of the attenuation
to variations in t j the ferrite was located 1 cm from the
walls of the array. This location provides for easy
installation and removal of the ferrite. The loaded array is
presently scheduled to be installed In the debuncher ring
during the last week of April 1985. Tests to evaluate the
utility of the ferrite lining should begin sometime in June
1965.
100
E 00
2 60
m
2 40
v»
o 20
0
.5 .5 Ghz/DIV 5.5
Fig. 4. Attenuation of Dominant Mode
in NZ-51 Loaded 2-4 GHz Array.
3