Magnetic assessment and modelling of the Aramis undulator beamline

Calvi, M.; Camenzuli, Christian; Ganter, R.; Sammut, Nicholas; Schmidt, Th.

doi:10.1107/s1600577518002205

Cited by 16 publications

(10 citation statements)

References 14 publications

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“…When feedback is turned off, it can be seen that the hall probe strays from the centre of the undulator axis by 58 μm , which reflects imperfections in the mechanical structure of the system. In comparison, the previous measurement bench [4] obtained an absolute error value of 20 μm in the best case with feedback on.…”

Section: Position Feedbackmentioning

confidence: 82%

“…This procedure is performed in addition to a number of measures taken to ensure correct setup of the SAFALI system. This includes ensuring parallelism between the two laser beams as well as parallelism between the laser beams and undulator axis through the use of laser interferometers as is always done prior to undulator characterisations [4].…”

Section: Alignment Proceduresmentioning

confidence: 99%

“…The second benchmark used was a set of magnetic measurement data taken for magnetic assessment and modeling of the Aramis U40730 undulators [4]. This data is obtained using an older version of the measurement bench, which uses the previous model of the Three-axis Teslameter.…”

Section: Reproducibility Studymentioning

confidence: 99%

“…final magnetic field profile. After the first measurement and optimisation of the individual magnetic poles the magnetic arrays need to be disassembled and installed inside of the vacuum chamber, which is an operation that causes magnetic field errors typically in the order of tens of micrometers [4]. This later needs to be adjusted through a second series of magnetic measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic array needs to be specifically designed to make the process of individual magnet optimisation simple and smooth. A successful example of this magnetic array design is presented by Calvi [4], where the magnetic poles are easily adjusted on the micrometer scale by means of a system using a wedge and screw. The implementation of this system in the new magnetic measurement bench is presented in the following sections of the paper.…”

Section: Introductionmentioning

confidence: 99%

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Development of a new magnetic measurement bench for in-vacuum undulators

et al. 2019

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Magnetic measurement benches are used to measure the magnetic field profile of insertion devices such as undulators. A critical feature of these benches is the traversal of a measurement head such as a Hall probe through the undulator whilst keeping it perfectly centered, ensuring that the measurement obtained is not distorted by physical displacements of the probe during measurement. This paper presents a detailed novel design for a new magnetic measurement bench based on the SAFALI Hall probe positioning system, which facilitates the measurement as well as magnetic optimisation of the magnetic field from inside of a vacuum chamber. The paper gives a brief introduction to in-vacuum undulators and describes the new developments in the magnetic measurement bench. The design of the electronics involved in the bench is then explained, including the wireless communication systems used to operate the bench. The reproducibility of magnetic field measurements as well as the precision of the hall probe positioning are also discussed and presented.

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Section: Position Feedbackmentioning

confidence: 82%

Section: Alignment Proceduresmentioning

confidence: 99%

Section: Reproducibility Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations