Diagnostics Experts of European Light Sources [DEELS]

Discussion Trigger: Early commissioning beam size measurement

13 May 2025, 14:00

30m

Elettra-Sincrotrone Trieste

Discussion trigger Beam Size Session 7

Speaker

cigdem ozkan loch (paul scherrer institute)

Description

Our beam size monitor employs π-polarized visible light and Fresnel zone plates (FZPs). There was an intriguing discrepancy during early commissioning between the two techniques. Beam size measurements using visible light matched expectations, while those obtained with FZPs were significantly larger. Interestingly, the FZP-measured beam size gradually decreased with accumulated beam dose.
I would like to invite a discussion on whether this phenomenon has been encountered elsewhere and how it was interpreted or mitigated.

Presentation materials

Ozkan_DEELS25_DiscTrig.pptx