Theory, Design and Tests on a Prototype Module of a Compact ...

6. THE FINAL STEPS OF THE TUNING PROCEDURE 91
tank # cell type left [mm] right [mm]
1 AC +4.5 +6.6
CC +1.2 +6.4
2 AC +6.2 +6.8
CC +1.2 +6.4
3 AC +5.9 +4.4
CC +1.2 +6.4
4 AC +2.0 +4.6
CC +1.2 +6.4
Table 5.3. The final tuners positions.
such a condition, a local error does not change significantly the flatness
of field <strong>and</strong> the π/2 frequency. The figure 5.22 shows four cases of
Figure 5.22. The effect of perturbations a) in the end
cell, b) in 6 CCs (two for tank), c) in 2 ACs in tank #2,
d) in all the ACs of tank #3.
perturbation on the structure. In the case a) a magnetic loop was
introduced in the end cell of the fourth tank <strong>and</strong> this implied a shift of
the resonant frequency of 40 kHz. In the case b) the tuners of two CCs
for the tanks #1,#3 <strong>and</strong> #4 were brought out of 0.3 mm. In the case
c) the tuners of two ACs of tank #2 were completely brought out <strong>and</strong>,
at last, in the case d) the tuners of seven ACs of tank #3 were brought
out of 0.4 mm <strong>and</strong> the tuners of six ACs of tank #3 were pushed inside
of 0.4 mm.