| Paper | Title | Page |
|---|---|---|
| CT06 | The Measurement of Q' And Q'' in the CERN-SPS by Head-Tail Phase Shift Analysis | 79 |
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| A so-called "Head-Tail" chromaticity measurement system has recently been installed in the CERN-SPS, which allows the chromaticity (Q’) to be calculated from several hundred turns of data after transverse excitation. The measurement relies on the periodic dephasing and rephasing that occurs between the head and tail of a single bunch for non-zero chromaticity. By measuring the turnby-turn position data from two longitudinal positions in a bunch it is possible to extract the relative dephasing of the head and the tail, and so to determine the chromaticity. In addition, by changing the orbit of the circulating beam this technique allows the variation of chromaticity with radial position (Q’’) to be measured with a much higher resolution than is currently possible using RF modulation. This paper describes this "Head-Tail" measurement technique and discusses some recent results obtained using prototype LHC beam (25 ns spacing) in the CERN-SPS. | ||
| CT08 | Measuring Beta-Functions with K-Modulation | 85 |
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| The precise measurement of the local value of the beta-function at the place of a beam size monitor is necessary for the precise determination of the beam emittance. We developed a new method for the measurement of the beta-function by using of continuous square-wave modulation of the force of the quadrupole and by continuous tune tracking. Measurements were performed at LEP in order to evaluate the precision that can be achieved with this method in the LHC. The paper describes the method and discusses in details the results obtained at LEP for colliding and non-colliding beams. | ||
| CT11 | New Development of a Radiation-Hard Polycrystalline CDTE Detector for LHC Luminosity Monitoring | 94 |
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| Detectors presently considered for monitoring and control of the LHC luminosity will sample the hadronic/electromagnetic showers produced by neutrons and photons in copper absorbers designed to protect the superconducting magnets from quenching. At this location the detectors will have to withstand extreme radiation levels and their long term operation will have to be assured without requiring human intervention. For this application we have successfully tested thick poly-crystalline-CdTe detectors. The paper summarizes the results obtained on rise-times, sensitivity and resistance to neutron irradiation up to a dose of 1015/cm2. | ||
| PM10 | A Logarithmic Processor for Beam Position Measurements Applied to a Transfer Line at CERN | 186 |
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| The transfer line from the CERN proton synchrotron (PS) to the super proton synchrotron (SPS) requires a new beam position measurement system in view of the LHC. In this line, the single passage of various beam types (up to 7), induces signals with a global signal dynamics of more than 100 dB and with a wide frequency spectral distribution. Logarithmic amplifiers, have been chosen as technical solution for the challenges described above. The paper describes the details of the adopted solutions to make beam position measurements, with a resolution down to few 10-4 of the full pickup aperture over more than 50 dB of the total signal dynamics. The reported performances has been measured on the series production cards, already installed into the machine and on one pickup in the transfer line. | ||
| DS03 | Industrial Products for Beam Instrumentation
Session 3: Monday Afternoon (16:30--18:00 Hrs) |
227 |
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In various branches of high technology industry there has been considerable progress
in the past years which could be used for beam instrumentation.
The subject will be introduced by two short demonstrations:
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