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Non-mover based BBA in Extraction Line

This document outlines the commissioning meeting held on August 20, 2008, led by Toshiyuki Okugi from KEK. The discussion focuses on two approaches for estimating the quadrupole center in relation to the BPM center and correcting orbit differences compared to the optics model by varying quadrupole strength. Key to this process is the execution of the Beam Based Alignment (BBA) with limited beam time, although errors in the optics model introduce some uncertainty. The measurement of orbit differences and preparation of local bumps are essential steps in optimizing the extraction line.

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Non-mover based BBA in Extraction Line

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  1. Non-mover based BBA in Extraction Line ATF2 commissioning meeting 8 / 20 / 2008 Toshiyuki Okugi (KEK)

  2. We have two approach … • We can estimate the quadrupole center with respect to BPM center • to compare the orbit difference with the optics model • by changing the quadrupole strength. • - We can perform the BBA with a short beam time, • but the error of the optics model makes the ambiguity • of the quadrupole center position. • 2) We will measure the orbit difference by change the quadrupole strength • for various beam orbits at the quadrupole with local bumps, • and we can find the beam position with minimum orbit difference. • - We must prepare the program to make local bumps. • - We will spend the 2 or 3 shift to measure the quadrupole center. We will measure the BBA for stripline BPMs after the optics modeling measurement.

  3. We must make the following software programs for the preparation of the extraction BBA measurement. 1) “quadrupole–BPM response” program. 2) local bump at extraction line.

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