10th ESLS RF Meeting September ALBA RF System. F. Perez. on behalf of the ALBA RF Group. ALBA RF System 1/21

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1 ALBA RF System F. Perez on behalf of the ALBA RF Group ALBA RF System 1/21

2 Synchrotron Light Source in Cerdanyola (Barcelona, Spain) 3 GeV accelerator 30 beamlines (7 on day one) Spanish Government Catalan Government First beam for users 2010 July 27th, 2006: Oficial start of the building work ALBA RF System 2/21

3 General Layout Booster RF Plant (1 Tx / cavity) Storage Ring RF Plants (2 Tx / cavity) RF Lab (1 Tx / cavity) ALBA RF System 3/21

4 SR RF TRANSMITTER Tube type Number Power Combination IOT 6 x 2 IOTs 2 x 80 kw CaCo RF Voltage 3600 kv Beam current 400 ma Losses (inc. IDs) 1300 kev/turn Beam power 520 kw ALBA RF System 4/21

5 SR RF Layout Load Circulator WR1800 CaCo WATRAX DAMPY cavities RF Tx ALBA RF System 5/21

6 Booster RF At 3 GeV RF Voltage 900 kv Beam current 2 ma Losses (inc. IDs) 627 kev/turn Beam power 1.3 kw TRANSMITTER Tube type 1 IOT Power 80 kw ALBA RF System 6/21

7 RF Lab Up to 80 kw In Spring 2007 installed provisionally in University Campus In Autum 2008 will be transllated to the new bulding ALBA RF System 7/21

8 Storage ring cavities : DAMPY Nose cones cavity with ferrite loaded dampers. The contract was signed in April 2006 with ACCEL for 7 identical pieces including girders, dampers, input windows and tuners. The CELLS prototype delivery is scheduled for January ALBA RF System 8/21

9 Dampy : modifications 2 spacers have been added to the girder to support the ridged waveguides. The wedges on which ferrite tiles are brazed can be taken apart without removing the whole damper. Vacuum gauge and a sapphire window at the end of one waveguide ALBA RF System 9/21

10 Booster cavity 5 cells cavity operating in π mode very similar to PETRA cavities. The contract was signed in April with ACCEL. The design report was approved in September Delivery is scheduled for January ALBA RF System 10/21

11 RF Transmitter awarded to Thomson : IOT Cabinet Delivery and installation of 14 transmitters (80 kw cw): IOT HVPS SSA Aux. PS Control system Kick-off meeting by next weeks with Thomson 1 st unit by May 2007 for the RF High Power Lab Following units from mid 2008 ALBA RF System 11/21

12 WG Systems Tendering done in 3 batches: BATCH 1 : Standard Waveguide lines (WR1800) Straights, Bends, bellows, bidirectional couplers, transitions BATCH 2 : Circulators BATCH 3 : Dry Loads 3 Companies in the tendering: AFT Ferrite Inc. MEGA Industries 2. Ferrite Inc. 1. MEGA Industries 3. AFT Decision to be validated ALBA RF System 12/21

13 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 ALBA RF System 13/21

14 LLRF Analog prototype The ALLRF prototype has been successfully tested with a mock-up cavity. The measured group delay of the low-level electronics is 500 ns. The noise level is better than what we had specified (i.e. 1% and 1 ). A LLRF bandwidth of 1 MHz and a dynamic range of >23 db have been achieved. ALBA RF System 14/21

15 Low Level RF Digital Prototype DSP Digital Board Analog Front End IF Cav 12.5MHz ADC 50MHz FPGA I Control IF DAC 50MHz Analog Front End 500MHz Down Conversion IF FW 12.5MHz ADC 50MHz Digital IQ Demodulation and Control Loops Q Control IF DAC 50MHz Up Conversion 512.5MHz 50MHz Digital Timing System 50MHz 512.5MHz Analog Timing System RF Forward Signal (500MHz) RF Voltage Cavity Signal (500MHz) CAVITY Amplifier RF Control Signal (500MHz) Tuning Control Loop ALBA RF System 15/21

16 Analog Front Ends and Timing System -Up/Down conversion from RF to IF: Mixers and low pass filters from Mini-Circuits -Digital clocks for ADCs and DACs: Clock synchronizer board from Texas Instruments -Reference Signal (RF MHz) for down and up conversion. Outputs: 100MHz Ref Signal IF MHz 50MHz (ADCs&DACs Clk) RF Cav 25MHz 12.5MHz Hybrid Splitter IF 0º IF 90º Mixer Mixer LP LP IF Cav IF Fw Input External Reference (10MHz) RF Clock 500MHz RF Fw ALBA RF System 16/21

17 IQ Control Loops: Amplitude 200 Amplitude 117 Amplitude mv mv t(s) x Amplitude Reference Least Square Approx t(s) x Am plitude Error 2 2 Amplitude = I + Q ± 1.2mV Total Amplitude Stability = = 0.63% mv t(s) x 10-3 ALBA RF System 17/21

18 IQ Control Loops: Delay and Phase IRef IRef mv 69 mv t(s) x µs I Signal Reference Least Square Approx t(s) x 10-4 Group Delay: Around 2.5-3µs IQ Angle IQ Angle t(s) t(s) Phase Stability: ±0.2 at top of the ramp ±3 at bottom of the ramp ALBA RF System 18/21

19 Analog/Digital LLRF comparison - Performance Group delay Bandwidth Ripple removal up to Phase stability Amplitude stability Dynamic range ALLRF 500 ns 1 MHz 30 khz ±0.5 ±0.5 % 23 db DLLRF 3 µs - 2 khz ±0.2 ±0.75 % 20 db The stability, speed and dynamic range of the DLLRF is supposed to improve after analogue front end improvements. ALBA RF System 19/21

20 Summary 1) SR Dampy Cavity: 1st unit in January ) Booster Cavity: 1st unit in January ) RF Transmitter: 1st unit in May ) Waveguide: Awarding in the following weeks 5) LLRF: Prototypes ready Tests at ELETTRA with cavity next week 6) RF Lab: Foreseen for May 2007 ALBA RF System 20/21

21 The RF Group Francis Perez Paco Sanchez Michel Langlois Hooman Hassanzadegan Angela Salom Marc Cornelis (support Eng. Div.) Roberto Ranz (support Comp. Div.) ALBA RF System 21/21