Abstract
This contribution deals with the topic of slow extraction spill quality characterization based on the measurements performed at GSI SIS-18. The sensitivity of the spill to power supply ripples are studied by introducing external ripples. An estimate of sources of inherent power supply ripples along with ripple magnitude are thus obtained. Spill characterization in time and frequency domain are discussed and exemplified by a typical spill and the differences from an ideal or Poisson spill. An appropriate spill characterization aims to provide a suitable abstraction for communication about the spill quality requirements between accelerator operations and users.
Highlights
Extracted beam from GSI SIS-18 is required by users for a variety of experiments
This contribution deals with the topic of slow extraction spill quality characterization based on the measurements performed at GSI SIS-18
The sensitivity of the spill to power supply ripples are studied by introducing external ripples
Summary
Extracted beam from GSI SIS-18 is required by users for a variety of experiments. The spill uniformity or coarse spill is related to the appropriate choice of amplitude and speed of quadruple strength scan in the resonant extraction and knock out exciter power scan for a given beam amplitude and tune distribution. A quantitative measure of the spill is the duty factor (F ) typically calculated over the same time bin Tc as the coarse spill. It compresses the properties of the histogram, mean (μ) and variance (σ2) into a single quantity and helps a better visualization of spill quality over time. That it is the distribution of the shot noise and is characterized by large ”dc” component and a flat spectrum in frequency domain
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