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REGULATION LOOPS AND RF CONTROL SYSTEM FOR SOLEIL

REGULATION LOOPS AND RF CONTROL SYSTEM FOR SOLEIL. 8 th ESLS RF meeting Daresbury, September 29 th - 30 th , 2004. M. DIOP. BOOSTER 35 KW AMPLIFIER. 2.5 kW ampli. 8-way splitter. 2.5kW coupler. 8 x 330 W. 2-way splitter. 2x20 kW combiner. 35 kW. 40 kW coupler. 35 kW AMPLIFIER.

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REGULATION LOOPS AND RF CONTROL SYSTEM FOR SOLEIL

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  1. REGULATION LOOPS AND RF CONTROL SYSTEM FOR SOLEIL 8th ESLS RF meeting Daresbury, September 29th - 30th, 2004 M. DIOP

  2. BOOSTER 35 KW AMPLIFIER 2.5 kW ampli 8-way splitter 2.5kW coupler 8 x 330 W 2-way splitter 2x20 kW combiner 35 kW 40 kW coupler 35 kW AMPLIFIER 20 kW (18 x 8) + 2 = 146 modules 146 modules of 330 W 2.5 kW ampli

  3. AMPLIFIER SUPERVISION • Microcontroller and multiplexing system

  4. BOOSTER REGULATION LOOPS • 3 « slow » loops (frequency, amplitude and phase) Adapted version of the LURE system

  5. REGULATION LOOPS • Characterization of the regulation loops Frequency loop transfer function Voltage loop transfer function Result: BP = 10 kHz for a 200 mV modulation Result: BP = 5 Hz for a 50 mV modulation P = 10 KW

  6. Water flows, Temperatures, … AMPLIFIER CAVITY AND LLES P ref I x 2 x 146 modules Pi, Pr x 16 MULTIPLEXING Vacuum An. & dig. I / O PSS Machine intlk AI Cmd SOLEIL CONTROL « TANGO » µcontroller Hardwired fast interlock PLC CPCI Ethernet RS232 Power supplies off Pin Pout to amplifier RF switch BOOSTER CONTROL SYSTEM LLES: Low Level Electronic systems

  7. STORAGE RING AMPLIFIER • 190 kW Amplifier (1 per cavity) 4 x 50 kW 726 modules of 315 W

  8. 50 KW UNIT PRINCIPLE 2-way splitter 10-way splitter 50 kW UNIT x 4 for one 190 kW ampli 4 x [10 + (20 x 8)] + 2 = 682 + 44 « stand-in » = 726 modules

  9. AMPLIFIER SUPERVISION • Microcontroller and multiplexing system STORAGE RING AMPLIFIER CONTROL

  10. Y=Ib/I0 SC NC - (tuning angle) ROBINSON STABILITY • STORAGE RING : 4 Superconducting 352 MHz cavities, housed per pair in 2 cryomodules • Very high beam loading (Ysc ~ 10 Ync) limit of Robinson instability (zero margin) Robinson stability diagram (matched condition, Pref = 0 at max Ib)

  11. Vset + G - Ig Ib - + Vc Cavity Zc Vgo REGULATION LOOPS • Cure : direct RF feedback loop • RF signal coming from the cavity pick-up re-injected into the power ampflifier to reduce the impedance seen by the beam

  12. REGULATION LOOPS • STORAGE RING PHASE 1: • Booster - like « slow » frequency, amplitude and phase loops + direct RF feedback FEEDBACK

  13. 190 kW AMPLIFIER Cavity + e- - - RF DIRECT COMB-FILTER REGULATION LOOPS Gain limited by direct RF feedback delay Optimization: comb-filter in parallel • This filter enables us to adjust the feedback phase at sideband frequencies Possibility to reduce selectively the cavity impedance at the synchrotron sidebands of the revolution harmonics to cope with longitudinal coupled-bunch instabilities

  14. REGULATION LOOPS • STORAGE RING PHASE 2: • Fast, Modular, Reliable, Flexible Design of fast digital amplitude and phase loops (collaboration with CEA)

  15. Water flows, Temperatures, … AMPLIFIER CAVITY AND LLES P ref I x 2 x 680 modules Pi, Pr x 80 MULTIPLEXING Vacuum An. & dig. I / O PSS Machine intlk AI Cmd SOLEIL CONTROL « TANGO » µcontroller Hardwired fast interlock PLC CPCI Ethernet RS232 PLC Cryo Power supplies off Pin Pout to amplifier RF switch STORAGE RING CONTROL SYSTEM LLES: Low Level Electronic systems

  16. SUPERVISION • PLC structure STORAGE RING STORAGE RING STORAGE RING STORAGE RING SIEMENS S7-300 (Cryomodule)

  17. CONCLUSION • Regulation loops • BOOSTER: Use of « slow » analogic amplitude, phase and frequency loops • STORAGE RING: • Phase 1: booster like system + direct RF feedback loop • Phase 2: replacement of the analogic system with a digital one using fast amplitude and phase loops • RF control systems • CPCI => RF diagnostics • PLC => cavities and amplifier interlocks • Hardwired fast interlocks • Dedicated PLC for cryo-plant (storage ring)

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