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Sextupole snapback detector
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

At the European Organisation for Nuclear Research a new accelerator, the Large Hadron Collider (LHC),is under construction. Superconducting magnets will guide the beam, and this technique implies problems with the magnetic field, such as snapback. Snapback is a fast change of magnetic field that occurs during the first seconds of the energy ramp in particle accelerators. In particular, sextupole snapback, taking place on a time scale of some seconds, must be compensated with great accuracy to achieve the desired beam quality in modern accelerators such as LHC. Standard magnetic measurements with a rotating coil do not have enough time resolution to resolve the snapback phase. For this reason we have developed a new and fast system dedicated to sextupole measurements. The system consists of three Hall plates, mounted on a ring and forming an equilateral triangle. In the ideal case this geometrical arrangement compensates for the main dipole field and produces a signal proportional to the sextupole field. Misalignments in the mounting and differences in the sensitivities of the Hall plates are compensated with a dedicated instrumentation amplifier. With this hybrid compensation technique a dipole bucking ratio in excess of 1000 has been achieved, which allows a direct sextupole measurement at a frequency of 5 Hz. In this MCs diploma thesis we present the details on the measurement probe, as well as main results of first measurements performed on a 15 m LHC dipole prototype and a comparision to results obtained with rotating coils. A more technical report has been presented at an international conference.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Sextupole, Snapback, Detector, Trio, Superconducting, Dipole, Magnets, Hall plates, Amplifier
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58421ISRN: LTU-EX--00/133--SELocal ID: f007dfaf-ddd2-49d4-ac10-46b34eda9f29OAI: diva2:1031809
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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