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IT04 |
Review of Emittance and Stability Monitoring Using Synchrotron Radiation Monitors
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16 |
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- K. Holldack, J. Feikes, W.B. Peatman
BESSY, Berlin, Germany
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Different techniques of emittance and stability monitoring using bend
magnet and undulator radiation will be reviewed. Besides imaging methods
for emittance monitoring , the problem of XBPM's used for the measurement
of the centre of mass position of the undulator beams will be treated in
detail. The key feature of these monitors is a careful electron optical
design to take account of gap dependent changes of the shape and photon
energy of the undulator beam as well as spurious signals from dipoles and
high heat load. The reason for the fact that these monitors work well on
low energy machines like BESSY II but often fail due in high energy
machines will be demonstrated by experimental results obtained on
different types of BESSY II insertion devices such as undulators,
wavelength shifters, multipole wigglers and electromagnetic undulators.
Experimental results of global and local orbit monitoring and a proof of
principle of a XBPM-based local feedback will be shown.
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