CERN Accelerating science

Preprint
Report number	CERN-ACC-2019-0052
Title	First High-Intensity Beam Tests with Telescopic Flat Optics at the LHC
Author(s)	Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (University of Malta (MT)) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Fuster Martinez, Nuria (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Karastathis, Nikos (CERN) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Malina, Lukas (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (University of Manchester (GB)) ; Persson, Tobias Hakan Bjorn (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Schaumann, Michaela (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN) ; Tomas Garcia, Rogelio (CERN) ; Valuch, Daniel (CERN) ; Wegscheider, Andreas (Hamburg University (DE)) ; Wenninger, Jorg (CERN)
Publication	2019
Imprint	01 Apr 2019
Number of pages	39
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Keywords	LHC ; HL-LHC optics ; ATS scheme ; flat optics
Abstract	The paper reports on the first high-intensity beam tests obtained with flat optics in 2018 (MD2148). This new machine configuration is described in terms of hypercycle, optics transitions, and dedicated beam gymnastics. The various commissioning steps which were needed to obtain the green light for an intensity ramp up are highlighted, in particular the optics measurements and corrections, the triplet aperture measurements, and the collimation-related activities. First collision of trains took place in the second 2018 LHC MD block. The main results are given in terms of luminosity, long-range beam-beam mitigation with lattice octupoles, and corresponding crossing angle reach.
Submitted by	[email protected]