| Paper |
Title |
Page |
| PT01 |
Closed-orbit correction using the new beam position monitor electronic of Elsa Bonn
|
153 |
| |
- J. Dietrich, I. Mohos, J. Keil
IKP, Forschungszentrum Jülich GmbH, Jülich, Germany
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RF and digital electronics, developed at the
Forschungszentrum Jülich/IKP were integrated to form
the new beam position monitor (BPM) system at the
Electron Stretcher Accelerator (ELSA) of the University
of Bonn. With this system the preservation of the
polarization level during acceleration was currently
improved by a good correction of the closed-orbit. All
BPM offsets relative to the magnetic quadrupole centers
were determined by the method of beam-based alignment.
The optics functions measured by the BPM system are in
good agreement with theoretical predictions.
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| PT02 |
Real-time betatron tune measurement in the accelerator ramp at COSY-Jülich
|
156 |
| |
- J. Dietrich, I. Mohos
IKP, Forschungszentrum Jülich GmbH, Jülich, Germany
|
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| |
A new real-time method for betatron tune measurements
at COSY was developed and tested from the
early 1997. A bandlimited broadband noise source was
used for beam excitation, the transversal beam position
oscillation was bunch-synchronous sampled and digitized
with a high resolution ADC. The Fourier transform of the
acquired data represents immediately the betatron tune.
After the first promising experiments an automatic
tunemeter was constructed. The tunemeter is used as
routine diagnostic tool since end of 1998.
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