18-19 April 2018
Diamond Light Source
Europe/London timezone
Diagnostics Experts of European Light Sources

Characterisation of ESRF-EBS BPM blocks

18 Apr 2018, 14:00
30m
G59 (Diamond Light Source)

G59

Diamond Light Source

Diamond House, Harwell Campus, Didcot, OX11 0DE, United Kingdom
Talk DEELS

Speaker

Benoît Roche (ESRF)

Description

In order to check the quality of the BPM blocks that will be installed in the ESRF-EBS we have developed a RF characterization bench, which simply measures the transmission between each of the 4 buttons. Every BPM block is measured at least twice: first when they arrive from the manufacturer, and later after being assembled on a girder, with 2 out of 10 of these BPMs also having undergone NEG coating. Thanks to these measurements we were able to detect some dimensional out-of-tolerance BPM blocks and also (more surprisingly) the presence of metallic dust, films or slivers in some of them. This characterization will also possibly be used in determining a first rough value for the BPM block's electric offset, so to minimize these offset at the time of early commissioning when beam-based alignment techniques are not yet possible.

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