Würzburg 2018 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Poster session

AKBP 8.18: Poster

Mittwoch, 21. März 2018, 18:00–19:30, NW-Bau - HS2

Slow Extraction Spill Characterization from Micro to Milli-Second Scale — •Peter Forck, Plamen Boutachkov, Rahul Singh, Stefan Sorge, and Horst Welker — GSI, Darmstadt

This contribution deals with the topic of slow extraction spill quality characterization based on the measurements performed at GSI SIS-18. As a first step, external ripples were introduced into the dipole and quadrupole power supplies to estimate the source and magnitude of coherent peaks seen in a spill spectrum. Spill characterization techniques in the time and frequency domain are discussed exemplified by typically measured spills and their differences from an ideal or "dc" spill. Standard characterization methods of the slow extraction spill is interesting due to two reasons, firstly; there is a big variety in experimental requirements with each having different tolerances to deviations from a "dc" beam occurring primarily due to beam response to imperfections like power supplier ripples. Secondly, different slow extraction methods lead to characteristic temporal variations of spill quality even during one extraction cycle; some examples are discussed. An appropriate spill characterization aims to provide a suitable abstraction for communication about the spill quality requirements between accelerator operations and users.