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Beam Measurements during 2014 Sector Tests: Insights and Findings

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ethan-young
7 diapositives · 184 Views · Nov 22, 2014

This document outlines the beam measurements performed during the 2014 sector tests by W. Bartmann and colleagues. It emphasizes the significance of early detection of potential issues through various measurement techniques, such as aperture and polarity measurements, alongside optics and collimation studies, within different regions including injection, arcs, and IRs. It highlights innovative strategies to improve measurement efficiency and discusses priority lists for components, such as BPMs and correctors, impacted by LS1 activities, aiming for comprehensive testing and optimization during the sector tests.

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  1. Possible beam measurements during 2014 sector tests W. Bartmann, M. Giovannozzi, S. Redaelli, R. Tomas, J. Wenninger Aperture Polarities Optics Collimation Acknowledgements: B. Goddard General comment: most of these measurements can be performed more efficiently with circulating beams. An early detection of possible issues is the justification for beam measurements during the sector tests. Sector Test Meeting - MG

  2. Aperture measurements • Regions: • Injection • Arcs • IRs • Dump channel • Arcs and IRs: • Create betatron oscillations along the sector(s) • Possibly fix amplitude to the expected required aperture at injection. • Scan over the phase Already covered by W. Bartmann on 8/5/2014 Sector Test Meeting - MG

  3. Polarity measurements - I • Elements to be probed (priority list): • BPM and orbit correctors • Circuits affected by LS1 activities • Skew correctors in sector 3-4: put back in operation during LS1 -> not available for sector tests • RQTF.A81.B1: four magnets removed from circuit -> not available for sector tests • RCOs: some magnets by-passed during LS1 • RCO.A78B2: 2 out of 77 magnets are bypassed-> available for sector test • RCO.A81B2: 2 out of 77 magnets are bypassed -> not available for sector test • Q5L8: new magnet installed during LS1 -> not available for sector tests Sector Test Meeting - MG

  4. Polarity measurements - II • Elements to be probed: • Skew quadrupoles (usually have polarity issues) • Circuits not fully tested during Run I • … • Sample test of circuits, e.g., • MQTs • MQTLs Sector Test Meeting - MG

  5. Optics • Combined transfer line + LHC ring studies (extension of tests proposed by W. Bartmann on 8/5/2014): • Kick response • Dispersion measurement Remember TL and ring matching puzzles in 2008 Sector Test Meeting - MG

  6. Ring Collimation • See details in Belen’s talk on 08-05-2014 on how to stop the beams • Envisage two dedicated measurements: • Parasitic: check acquisition of BPM signal of new collimators, when applicable. • Dedicated: BLM response with different collimator settings (“splash” events for different collimators in cleaning insertions – if reachable during the sector test) – BI request • Note: no need of special controls setup in LSA, manual movements and adjustment of interlocks. Sector Test Meeting - MG

  7. Possible plans: list of measurements/sector test • Group measurements in four blocks: • 1 shift: • arcs and IRs aperture • magnet polarities • 2×1/4 shift (spare time): • BPMs and orbit correctors polarities • Collimation measurements (splashes) • 1 shift: • Kick response measurements in TL and LHC ring. • Dispersion measurement in TL and LHC ring Possible synergies between the two types f measurements: trajectory excursion can be used to probe non-linear magnets Sector Test Meeting - MG