9th ESLS RF Meeting September ALBA RF System. F. Perez. RF System 1/20

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1 ALBA RF System F. Perez RF System 1/20

2 ALBA Synchrotron Light Source in Barcelona (Spain) 3 GeV accelerator 30 beamlines (7 on day one) Spanish Government Catalan Government First beam for users 2010 RF System 2/20

3 RF System 3/20

4 Time Schedule Building construction Linac Call for tender Construction Installation and commissioning Booster Call for tender for components Construction Installation and commissioning Storage Ring Call for tender for components Construction Installation Storage Ring Commissioning Beam Lines Commissioning Beam for users As for June RF System 4/20

5 RF Parameters RF Voltage 3600 kv Beam current 400 ma Losses (inc. IDs) 1300 kev/turn Beam power 520 kw TRANSMITTER Tube type IOT Number 6 x 2 IOTs Power 2 x 80 kw Combination CaCo CAVITY DAMPY Type single-cell HOM damped Number 6 Frequency 500 MHz Rsh 3.1 Mohm Voltage 600 kv Input power 150 kw Cooling capacity >60 kw RF System 5/20

6 Dampy Circulator Load IOT CaCo RF System 6/20

7 RF System 7/20

8 RF System 8/20

9 DAMPY: 1) Improved RF losses gap 2) Improved waveguide dampers BESSY Development RF System 9/20

10 Waveguide to Coaxial transition 1) Allow water cooling channels in 2) Up to 160 kw 3) Fit the geometry B.Baricevic and M.Cornelis RF System 10/20

11 Waveguide to Coaxial transition Maximum CW power: 150 kw VSWR: Max. peak electric field: 503 kv/m Power dissipated: W B.Baricevic RF System 11/20

12 CaCo: Cavity Combiner 1) Combine 2 IOTs 2) Filter Harmonics 3) Operation with faulty IOT Prototype ordered May 2005 Low power test 1st week October High Power test end of October RF System 12/20

13 CaCo: Cavity Combiner 4 1/16 coaxial bidirectional couplers 4 1/16 coaxial WR1800 t 4 1/16 transition 4 1/16 coaxial elbows contact holder Protrusion in the WR1800 waveguide Tuning door Loop holders Resonant combine Capacitive coupling Flange to WR1800 SeeCaCotalkin session 5 by Borut Baricevic RF System 13/20

14 Low Level RF Analogue Prototype I/Q Modulation / Demodulation Industrial PC GUI Ethernet Computer PCI bus PCI DAQ boards DAC DAC DAC DAC ADC Interlock Low-level electronics Cos?, Sin? FF set Reg. gain FB set Probe signal RF out I-Q mod AD8345 I+ I- Q+ I Q [2x2] Rotation Matrix I Q e I e Q I+ I- Q+ I-Q dem AD8348 Pre amplifier Q- Single-ended to Differential AD8132 Phase Shifter AD835 Regulator and Feed-forward AD835 Differential to Single-ended AD8130 Differential to Single-ended AD8130 Q- P probe 500 MHz 500 MHz MO Frequency doubler FD MHz Power Amplifier Cavity H.Hassanzadegan RF System 14/20

15 Low Level RF Analogue Prototype The mockup cavity The low-level electronics H.Hassanzadegan RF System 15/20

16 Low Level RF Analogue Prototype 1 µs Steady state output Measured: 7.6 mv Calculated: 7.5 mv Amplitude without regulation Ripple Measured: Calculated: ~2 mv 3.5 mv Loop delay Measured: ~200 ps Band width Measured: ~1 MHz Amplitude with regulation H.Hassanzadegan RF System 16/20

17 Low Level RF Hardware Description Digital approach RF + 20 MHz Reference Signal RF Cavity Signal Forward Signal Analog Front End IF 20MHz IF 20MHz ADC 14 bits Fs 80 MHz ADC FPGA IQ Demodulation & signal processing DSP Command and Diagnostic Signals DAC 16 bits Fs 80 MHz DAC I-IF 20MHz Q-IF 20MHz Analog Front End RF Drive 100 Mbytes/s Host PC Motor tuning loop H.Hassanzadegan and A.Salom RF System 17/20

18 Low Level RF 520MHz Signal Generators synchronized with 10MHz clock Signal Processing RF + 20 MHz Reference Signal 20 MHz RF clock 500 MHz Splitter (0/90 ) Splitter (0/90 ) 0º 90º 0º 90º Quadrature Modulator + + Digital approach 520MHz Cavity Amplifier Set Points FPGA 16b cos(fdac/n) RF Cavity 500MHz Forward 500MHz Analog Mixer Analog Mixer LP LP IF 20MHz IF 20MHz ADC 80 MHz 14bits 40 MHz ADC 80 MHz 14bits 40 MHz DEMUX DEMUX I Q I Q ±1 ±1 ±1 ±1 Motor Tuning Control + - Control 2 x 2 + (PID) Calibration Matrix - Resonance Control 16b + ± sin(fdac/n) NCO sin(fdac/n) + + cos(fdac/n) DAC 80 MHz 16bits DAC 80 MHz 16bits IF 20MHz IF 20MHz Quadrature Modulator/ Single Side Band Upconversion Diagnostic Signals DSP Analog Downconversion Digital Processing Host PC Analog Upconversion Diagnostic Points H.Hassanzadegan and A.Salom RF System 18/20

19 Summary 1) Dampy tender: closing next month 2) CaCo prototype: by Thales, next month 3) WG to COAX transition: order prototype end of ) Transmitter tendering: beginning ) Analogue LLRF: prototype in test 6) Digital LLRF: under design RF System 19/20

20 The RF & Diagnostics Section Francis Perez Borut Baricevic Hooman Hassanzadegan Paco Sanchez Angel Olmos Angela Salom Ubaldo Iriso Marc Cornelis (support Eng. Div.) David Beltran (support Comp. Div.) RF System 20/20