CERN, Geneva, Switzerland
As a part of the LHC Injectors Upgrade project (LIU) the 200 MHz Travelling Wave Cavities (TWC) of the Super Proton Synchrotron (SPS) will be upgraded. The two existing five-section cavities will be rearranged into four three-section cavities (using two existing spare sections), thereby increasing the total voltage from 7 MV (IRF = 1.5 A) to 10 MV (IRF = 3.0 A). Projections of the HL-LHC (High Luminosity Large Hadron Collider) era are conceived by the macro-particle simulation code BLonD, that makes use of an impedance model of the SPS, developed from a thorough survey of machine elements. This paper analyses the impedance contribution of the 200 MHz cavities in the two configurations, using electromagnetic simulations. Measurements of the existing cavities in the SPS and a single-section prototype are also presented.
WEAM6Y01
CERN, Geneva, Switzerland
As a part of the HL-LHC upgrade significant R&D has taken place on compact superconducting crab cavities. Their implementation in high energy proton collider will be the first of its kind including the initial phase of technology validation in the SPS. This paper will primarily focus on the recent progress on the cavity and cryomodule developments and some of the main challenges. A few aspects related to the impact of crab cavities on the LHC beams are also addressed.
