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T: Fachverband Teilchenphysik

T 82: Beschleunigerphysik 4

T 82.3: Talk

Tuesday, February 28, 2012, 17:15–17:30, VG 1.104

Crab Cavities for the LHC — •Tobias Baer^{1, 2}, Rama Calaga¹, Riccardo de Maria¹, Eckhard Elsen³, Stephane Fartoukh¹, Rogelio Tomas¹, Joachim Tuckmantel¹, Jorg Wenninger¹, Bruce Yee Rendon¹, and Frank Zimmermann¹ — ¹CERN, Geneva, Switzerland — ²University of Hamburg, Germany — ³DESY, Hamburg, Germany

For the high-luminosity LHC upgrade program (HL-LHC), the installation of crab cavities (CC) is essential to compensate the geometric luminosity loss due to the crossing angle and for luminosity leveling [1]. One of the major challenges is the compatibility with machine protection in the regime of >500MJ stored beam energy. Especially in a failure case (e.g. a CC quench or sparking in the coupler), the voltage and/or phase of a CC can change significantly with a fast time-constant of the order of a LHC-turn. This can lead to large, global betatron oscillations of the beam. The status of the LHC crab cavity upgrade program is presented and the influence of crab cavities on the beam dynamics is discussed. Necessary countermeasures to limit the impact of CC failures to an acceptable level are specified and operational scenarios that are compatible with machine protection considerations are proposed.

[1] L. Rossi, "Status of HiLumi", 1st HiLumi LHC/LARP Collaboration Meeting, Nov. 2011.