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Controlling accelerator beams for physics experiments
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , 49 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:9
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-3915OAI: oai:DiVA.org:kth-3915DiVA: diva2:10000
Presentation
2006-04-19, Sal FA31, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101124Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2010-11-24Bibliographically approved
List of papers
1. Experiments to Test Beam Behaviour Under Extreme Space Charge Conditions
Open this publication in new window or tab >>Experiments to Test Beam Behaviour Under Extreme Space Charge Conditions
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1994 (English)In: EPAC 94: 4th European Particle Accelerator Conference, 1994, 279-281 p.Conference paper, Published paper (Refereed)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-8398 (URN)
Note
QC 20100920Available from: 2008-05-09 Created: 2008-05-09 Last updated: 2010-11-24Bibliographically approved
2. Automatic beam steering in the CERN PS complex
Open this publication in new window or tab >>Automatic beam steering in the CERN PS complex
1995 (English)In: Proceedings of the 1995 16th Particle Accelerator Conference, 1995, 2178-2180 p.Conference paper, Published paper (Refereed)
Abstract [en]

The recombination, transfer and injection of the four beams from the PS Booster to the PS Main Ring, have a high level of intricacy and are a subject of permanent concern for the operation of the PS Injector Complex. These tasks were thus selected as a test bench for the implementation of a prototype of an automatic beam steering system. The core of the system is based on a generic trajectory optimizer, robust enough to cope with imperfect observations. The algorithmic engine is connected to pick-up monitors and corrector magnets and its decision can be validated by the operator through a graphics user interface. Automatic beam steering can only be efficient if the beam optics is fully confirmed by experimental observations, a condition which forces the systematic elimination of errors both in hardware and software.

Keyword
Accelerator magnets, Algorithms, Automation, Computer hardware, Computer simulation, Computer software, Control systems, Error correction, Graphical user interfaces, Mathematical models, Optimization, Particle optics, Automatic beam steering, Beam emittances, Beam optics, Beam recombination, Beam transfer, Generic trajectory optimizer, Symbolic computing
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-8399 (URN)10.1109/PAC.1995.505490 (DOI)0-7803-2934-1 (ISBN)
Note
QC 20100921Available from: 2008-05-09 Created: 2008-05-09 Last updated: 2010-11-24Bibliographically approved
3. Production follow-up of the LHC main dipoles through magnetic measurements at room temperature
Open this publication in new window or tab >>Production follow-up of the LHC main dipoles through magnetic measurements at room temperature
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2004 (English)In: IEEE transactions on applied superconductivity (Print), ISSN 1051-8223, Vol. 14, no 2, 173-176 p.Article in journal (Refereed) Published
Abstract [en]

In this paper we review the tools used for controlling the production of the LHC main dipoles through warm magnetic measurements. For the collared coil measurements, control limits are based on the statistics relative to the pre-series production. For the cold mass, the difference between collared coil and cold mass is considered, allowing a very stringent test. In both cases, measurements are split in straight part average, variations and coil ends contributions. Two different alarm levels exist in case the measured field is out of limits. The analysis can be carried out at the manufacturer and allows detection of anomalies in the measured magnetic field. These can be either due to wrong measurements or caused by assembly defects. Techniques used to work out information on the magnet assembly from the field harmonics are outlined. We summarize the experience gathered on about 180 collared coils and 120 cold masses, pointing out the bad cases and investigating the reliability of the measurements.

Keyword
magnetic field errors, magnet production control, warm magnetic measurements
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-8400 (URN)10.1109/TASC.2004.829037 (DOI)000223147500009 ()
Note
QC 20100921.Available from: 2008-05-09 Created: 2008-05-09 Last updated: 2010-11-24Bibliographically approved
4. Control of the Dipole Cold Mass Geometry at CERN to Optimize LHC Performance
Open this publication in new window or tab >>Control of the Dipole Cold Mass Geometry at CERN to Optimize LHC Performance
2006 (English)In: IEEE transactions on applied superconductivity (Print), ISSN 1051-8223, Vol. 16, no 2, 212-215 p.Article in journal (Refereed) Published
Abstract [en]

The detailed shape of the 15 m long superconducting LHC dipole cold mass is of high importance as it determines three key parameters: the beam aperture, nominally of the order of 10 beam standard deviations; the connectivity of the beam- and technical lines between magnets; the transverse position of nonlinear correctors mounted on the dipole ends. An offset of the latter produces unwanted beam dynamics perturbations. The tolerances are in the order of mm over the length of the magnet. The natural flexibility of the dipole and its mechanical structure allow deformations during handling and transportation which exceed the tolerances. This paper presents the observed deformations of the geometry during handling and various operations at CERN, deformations which are interpreted thanks to a simple mechanical model. These observations have led to a strategy of dipole geometry control at CERN, based on adjustment of the position of its central support (the dipole is supported at three positions, horizontally and vertically) to recover individually or statistically their original shape as manufactured. The implementation of this strategy is discussed, with the goal of finding a compromise between conflicting requirements: quality of the dipole geometry, available resources for corrective actions and magnet installation strategy whereby the geometry tolerances depend on the final magnet position in the machine.

Keyword
dipole geometry, feed down, mechanic aperture
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-8401 (URN)10.1109/TASC.2006.870507 (DOI)000244804100036 ()
Note
QC 20100921. Uppdaterad från manuskript till tidskrift (20100921).Available from: 2008-05-09 Created: 2008-05-09 Last updated: 2010-11-24Bibliographically approved

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