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Title: End-of-fill study on collimator tight settings
Authors: Assmann, Ralph W.
Bruce, Roderik
Burkart, Florian
Cauchi, M.
Deboy, Daniel
Redaelli, Stefano
Rossi, Adriana
Schmidt, Ruediger
Valentino, Gianluca
Wollmann, Daniel
Keywords: Large Hadron Collider (France and Switzerland)
Collimators (Optical instrument) -- Calibration
Particle beam instabilities
Colliders (Nuclear physics)
Beam optics
Issue Date: 2012
Publisher: CERN
Citation: Assmann, R., Redaelli, S., Schmidt, R., Valentino, G., Deboy, D., Wollmann, D., ... & Cauchi, M. (2012). End-of-fill study on collimator tight settings (No. CERN-ATS-Note-2011-125 MD), 1-13.
Abstract: In 2010 and 2011 the collimation system has been operated with relaxed settings, i.e. with retractions between different collimator families larger than the nominal settings that provide optimum cleaning. This configuration ensured a sufficient cleaning performance at 3.5 TeV while allowing larger tolerances on orbit control. Tighter collimator settings were proposed to push the cleaning performance and to allow larger orbit margins between TCDQ dump protection and tertiary collimators. With the same margins as with the relaxed settings, the β∗ could be reduced. After having verified with beam that the cleaning is improved as expected, the feasibility of tighter collimator settings must be addressed with high stored intensity. For this purpose, an end-of-fill study was proposed after a standard physics fill with 1380 bunches nominal bunches at 3.5 TeV, for a total stored energy of 95 MJ. During this test, primary and secondary collimators were moved to tight settings after about 8 hours of stable physics conditions in all experiments. This note summarises the operational procedure followed and the results of beam measurements during this study.
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