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TY - CONF AU - Antipov, S. A. AU - Amorim, D. AU - Biancacci, N. AU - Carver, L.R. AU - Mazzacano, G. AU - Mereghetti, A. AU - Métral, E. AU - Redaelli, S. AU - Salvant, B. AU - Valuch, D. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Single-Collimator Tune Shift Measurement of the Three-Stripe Collimator at the LHC J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - Several options of low resistivity coating have been proposed for the collimator upgrade of the Large Hadron Collider. In order to study their effect on the beam dynamics a special collimator has been built and installed in the machine. Its jaws are coated with three different materials and can be moved transversely to selectively expose the beam to the chosen coating. We have measured the resistive wall tune shifts of each coating material and compared them with that of a standard Carbon Fibre Composite (CFC) collimator jaw. A resolution of the tune shift of the order of 10⁻⁵ has been achieved in the measurement. The results show a significant reduction of the resistive wall tune shift with novel materials. The largest improvement is obtained with a 5 μm Molybdenum coating of a Molybdenum-Graphite jaw. The observed tune shifts show a good agreement with the impedance model and the bench impedance and resistivity measurements. Obtained results can be used to further improve the precision of the impedance model. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3036 EP - 3039 KW - impedance KW - octupole KW - luminosity KW - feedback KW - hadron DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAF035 UR - http://jacow.org/ipac2018/papers/thpaf035.pdf ER -