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000206164 1001_ $$0P:(DE-HGF)0$$aValentino, Gianluca$$b0
000206164 245__ $$aBeam feasibility study of a collimator with in-jaw beam position monitors
000206164 260__ $$aAmsterdam$$bNorth-Holland Publ. Co.$$c2014
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000206164 520__ $$aAt present, the beam-based alignment of the LHC collimators is performed by touching the beam halo with both jaws of each collimator. This method requires dedicated fills at low intensities that are done infrequently and makes this procedure time consuming. This limits the operational flexibility, in particular in the case of changes of optics and orbit configuration in the experimental regions. The performance of the LHC collimation system relies on the machine reproducibility and regular loss maps to validate the settings of the collimator jaws. To overcome these limitations and to allow a continuous monitoring of the beam position at the collimators, a design with jaw-integrated Beam Position Monitors (BPMs) was proposed and successfully tested with a prototype (mock-up) collimator in the CERN SPS. Extensive beam experiments allowed to determine the achievable accuracy of the jaw alignment for single and multi-turn operation. In this paper, the results of these experiments are discussed. The non-linear response of the BPMs is compared to the predictions from electromagnetic simulations. Finally, the measured alignment accuracy is compared to the one achieved with the present collimators in the LHC.
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000206164 7001_ $$0P:(DE-HGF)0$$aAberle, Oliver$$b1
000206164 7001_ $$0P:(DE-H253)PIP1017739$$aAssmann, Ralph$$b2
000206164 7001_ $$0P:(DE-HGF)0$$aBertarelli, Alessandro$$b3
000206164 7001_ $$0P:(DE-HGF)0$$aBoccard, Christian$$b4
000206164 7001_ $$0P:(DE-HGF)0$$aBruce, Roderik$$b5
000206164 7001_ $$0P:(DE-HGF)0$$aBurkart, Florian$$b6
000206164 7001_ $$0P:(DE-HGF)0$$aWollmann, Daniel$$b7$$eCorresponding Author
000206164 7001_ $$0P:(DE-HGF)0$$aNosych, Andriy$$b8
000206164 7001_ $$0P:(DE-HGF)0$$aValentino, Gianluca$$b9
000206164 7001_ $$0P:(DE-HGF)0$$aCalvo, Eva$$b10
000206164 7001_ $$0P:(DE-HGF)0$$aCauchi, Marija$$b11
000206164 7001_ $$0P:(DE-HGF)0$$aDallocchio, Alessandro$$b12
000206164 7001_ $$0P:(DE-HGF)0$$aDeboy, Daniel$$b13
000206164 7001_ $$0P:(DE-HGF)0$$aGasior, Marek$$b14
000206164 7001_ $$0P:(DE-HGF)0$$aJones, Rhodri$$b15
000206164 7001_ $$0P:(DE-HGF)0$$aKain, Verena$$b16
000206164 7001_ $$0P:(DE-HGF)0$$aLari, Luisella$$b17
000206164 7001_ $$0P:(DE-HGF)0$$aRedaelli, Stefano$$b18
000206164 7001_ $$0P:(DE-HGF)0$$aRossi, Adriana$$b19
000206164 773__ $$0PERI:(DE-600)2198917-5$$a10.1016/j.nima.2014.09.024$$p62–68$$tNuclear instruments$$v768$$x0369-643X$$y2014
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