1. Strategy for SPS 200 MHz LLRF upgrade (1)  Each of the four cavities (2x 5 sections, 2x 4 sections):  1-T Feedback (loop around cavity and amplifier)  Feedforward (taking beam signal from pick-up)  Electronics to generate a cavity sum signal with special time of flight compensation for ions  Instrumentation and hardware for monitoring and interlocking, cavity phase and gain monitoring  For each cavity: cavity phase and amplitude loop rendering the cavity phase independent of the forward phase of the power system and controlling the cavity voltage Cavity Controller Part, i.e. per cavity  Must be completed when restarting after LS2 as we will have six cavities with characteristics different from the present ones (4x 3 sections, 2x 4 sections)  Need test of a new cavity controller in a test stand and / or the machine; testing prototype in 2017 gives margin to react before LS2 restart in 2020 Considerable infrastructure, cabling and commissioning work in tunnel with movements of cavities and pick-ups in LS2

2. Strategy for SPS 200 MHz LLRF upgrade (2)  different beam types traditionally run with separate systems  SPS fixed target beam (14 GeV  450 GeV)  SPS LHC beam (26 Gev  450 GeV)  SPS ions, Pb and Ar with FSK modulation of the RF  Beam loops  Frequency/synchro loop (acting on cavity frequency/phase)  Radial loop (acting on cavity frequency/phases)  Longitudinal damper (acting on two cavities max) Beam Control: Loops closing around beam New requirements for ions: separate control in frequency and phase for different cavities or cavity groups for slip-stacking  Must define solution starting from requirements for ions, also impact on cavity controllers !  New digital frequency generation (with FSK) LHC VME-style for ions since <2010  New VME frequency program for protons/ions currently being deployed

3. Strategy for SPS 200 MHz LLRF upgrade (3)  Options for splitting of cavities into groups a)2 groups: similar length cavities in same group b)2 groups strictly identical: 1x 4, 2x3 section, one power plant of each type c)3 groups: similar power plant in same group d)6 groups: each cavity with separate control  maximum flexibility, but complex, locking/un-locking  Wish from FB section to not have separate systems for the different beam types  feasible, but how do we get there? Slip-stacking and beam control requirements:  Miscellaneous (new) requirements  Pulsed RF (to reduce CW)  not before LS2  Bunch rotation for LHC beam  …

4. Strategy for SPS 200 MHz LLRF upgrade (4) “Inventory” considered for consolidation (budget code 69318)  Controls (obsolete MMI G64, MIL1553)  completed in LS1  Electronics to distribute and receive synchronisation signals (generally via fiber) from and to the BA3 Faraday cage  PS RF, LHC RF, BA2 damper, BA4 AWAKE, kickers, f rev  done  Consolidation of the instrumentation and hardware for diagnostics and MDs  Beam Quality Monitor  done  Mountain Range Display  done  Pico scope  done  Oscilloscopes, network analyzers, spectrum analyzers  Cavity phase monitoring  done  Peak detection  ongoing  OASIS monitoring for CCC  upgrade with CO  Hardware for new extractions: AWAKE, neutrino experiments financed by operation/other projects