Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH Page: 3 of 6
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1.703 1.7035 1.704 1.7045
Figure 3: Dipole mode.
Horizontal and vertical position and angle scans have been made alternatively. The
first polarization has been used for vertical scans, and the second for horizontal ones.
Figure 4 shows a scan in each of the four transverse dimensions. The linear response of
the modes amplitude to beam movement can clearly be seen. The deviation from
linearity corresponds to beam jitter at the time of the measurement.
With alternative scans we could find the axis of the cavity, i.e. the beam trajectory
for which a minimum in this dipole mode amplitude is obtained. Please note that the
axis of other modes may be different, as already previously observed .
-0.4 -0.2 0
min.: 4 um
-I -0.5 0 1.5 1
mm.: 4 urad
Figure 4: Scan of beam position in the 4D space.
Cavity 1 HOM coupler 1
Passband 1. mode #6
Pol. 1: 1703.363 IMfHz
Pol 2: 1704.223 MfHz
1704.223 M Hz
min.: -2661 um
a. N .
30 ' min.: -87 urad
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Baboi, N.; Molloy, S.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al. Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH, article, March 20, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc882604/m1/3/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.