Interfaces of RF Systems for NCFE Pedro J

Interfaces of RF Systems for NCFE Pedro J. González Technology Director, ESS Bilbao NCFE and Interfaces Meeting 17 -18 January 2017 INFN Laboratori Nazionali del Sud, Catania www. essbilbao. org

RF Systems for Warm Linac • RF Power Systems at 352 MHz for NC Linac: – RFQ – 3 MEBT Bunchers – 5 DTL Tanks • These include: – – – 3 6+3 9 9 HV Power Converters (Modulators) High Power Amplifiers: Klystrons + SSPAs RF Distribution (RFDS): WR 2300 + 1 -5/8” RF-LPS (Local Protection System): Interlocks LLRF (+ 26 x LLRF for Spoke Linac) • “From AC Plug to Cavity Power Coupler” 3

NC RF Systems: Layout LINAC TUNNEL RF GALLERY DTL Tanks Klystron MEBT STUBS WR 2300 waveguides Circulator and Load Modulator RFQ 4

RF Systems: Main Interfaces AC Power – Modulators & others Waveguides – Cavity Power Couplers Cavity Pick-ups – LLRF & RF-LPS Phase Reference – LLRF – Cavity Tuning (using either stepper motors or cooling water temperature) • ICS (Timing, MPS, PSS) – RF Systems • • • 5

RF Systems: Interfaces • Definition of interfaces: – Mechanical/Physical: Type of connector/flange, male/female, position, … – Electrical/Functional: Signal/data characteristics such as levels, format, logic, impedance, … – Software: Protocols, procedures to exchange information, commands/messages, timing 6

RF Systems: Interfaces • Examples for the discussion: – RFQ and DTL tanks have 2 couplers/cavity Q. Amplitude and Phase matching requirements? – RFQ power splitter and load to be provided by CEA Q. Is anything needed? – Additional pickups in RFQ and DTL for monitoring purposes Q. Details? – Tuning loop for the RFQ and DTL resonant frequency (using the water temperature control, stepper motors, etc. ), running on LLRF CPU (commands are sent over EPICS) Q. Characteristics of the tuning systems? – ICS interfaces for LLRF and RF-LPS Q. Details? 7

NC RF Systems: WG Layout • 2 Power Couplers per Cavity: – Power Splitter + Amplitude and Phase Matching between Branches WR 2300 FH and HH waveguides H-Bend Directional Coupler Shutter Switch FH to HH Adapter Straight Section Load Bellow Connect to Cavity Power Couplers E-Bend Circulator Load Magic Tee Connect to Klystron Output Phase Shifter 8

NC RF Systems: RFQ fo Tuning *Taken from A. -C. Chauveau’s presentation on April 2016 9

RF Systems: MEBT Buncher 10

Thank you for your attention! Questions comments, etc. are welcome 11