SESAME STORAGE RING RF-SYSTEM SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME SR MAIN PARAMETERS ParameterValue Energy2.5 GeV Circumference m RF frequency MHz Radiation loss/turn605 KeV Beam current (maximum)400 mA Beam power loss (bare machine) 242 kW Harmonic number222 Momentum compaction factor Total RF voltage (maximum)2.4 MV Over voltage factor4 Number of cavities4 Energy acceptance1.45 % Synchrotron frequency37 KHz Synchronous phase165.5 º SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

ParameterBoosterStorage ring RF frequency MHz Harmonic number64222 Circumference38.4 m m Revolution freq MHz2.25 MHz RF wavelength0.600 m Coincidence freq KHz SESAME RF Layout and Main Parameters SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME SR RF SYSTEM GENERAL LAYOUT  So far, the above analog LLRF has been suggested for the Storage Ring  As a strong alternative, adopting a digital LLRF for the Storage Ring RF system is being studied.  A proposal for establishing a collaboration between ALAB & SESAME to build the SESAME DLLRF SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Main Oscillator 500 MHz Local Oscillator 20 MHz ADC FPGA DSP/PID DAC IQ modulator Amp 520 MHz 500 MHz (Cavity Signal) IF 20 MHz Digital Clock (80 MHz) I´I´ Q´Q´ Cavity Cavity Tuning Stepper Motor 500 MHz (Forward Signal) 500 MHz 520 MHz Digital IQ Demodulation Proposed Digital LLRF System SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

 Advantages Flexible and Reconfigurable via Software. Many sophisticated algorithms can be implemented via software. Remotely controlled and multi-user operation. DLLRF has built-in diagnostics, low down-time (MTBF), and high resolution is achievable.  Disadvantages  Long group delay.  More sensitive to radiation.  Needs good programming skills to develop software programs. Digital LLRF SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME SR RF Power Amplifier  SESAME has adapted the SSA technology instead of vacuum tubes due to: absence of high biasing voltages. longer life times. stable gain with aging. easier and quicker maintenance and no machine interruption. possibility of reduced power operation in case of failure.  SOLEIL design for 500MHz module had been adapted as the main block for building the amplifier tower based on the LDMOS BLF578XR transistors from NXP Semiconductors.  The –XR version showed lower performance compared to prior one, so it was dumped and will not be used to drive the RF module. BLF578XR BW MHz PLPL 225MHz P.Oper & P L 1200W; 1400 Gain D%D% :124dB : SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME SSA main block showing: Power transistor with the surrounding circuit. 2KW circulator on the output with ( ) MHz BW. 350W dummy load. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME SSA main module tests. Two colleagues from the RF group had visited SOLEIL to do all required tests. Phase1 tests were based on testing each module by itself, two groups of the module were identified, one is using the BLF578 x 8 and the other is using BLF578XR x 6. Phase2 tests were made for the whole group test as one amplifier. Phase3 tests were made by combining the two groups. The desired output level for each module was for both groups. BLF578 Module Dissipated Power W S 11 dB Gain dB %%  % Phase Shift  BLF578XR Module Dissipated Power W S 11 dB Gain dB %%  % Phase Shift  SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Gain vs. Pout for each module BLF578: 16.3 dB. BLF578XR: 15.4 dB. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Efficiency vs. Pout BLF578: 63%. BLF578XR: 55%. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Module BLF578#1 gain tests with respect to V DS voltage SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Module BLF578#1 efficiency tests with respect to V DS voltage SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Gain & Efficiency vs. combined power of the BLF578 modules SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

G & η vs. output power : combined output power of 6LF BLF578XR SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH Module Degradation Test Two groups of 8-Modules each were prepared. First group was tested with 650W to give a total output of 5.2KW for 1000h. Second group was tested with 725W to give a total output of 5.8KW for 1000h. The results of tests showed stable performance after 1000h. After the 1000h test is finished each module will be tested individually to check all its parameters in details.

DC-DC converter 300V–to- 50V RF Module RF tower power supply implemented in SOLEIL RF tower power supply will be implemented in SESAME; 220ACV-to-50VDC/2KW. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

4.8KW 24W 0.6W 600W 120W 3W 38.4KW KW 600W 120W3W 24W 0.6W 38.4KW 2-Way Combiner 76.8KW SESAME 75KW tower Solid State Amplifier architecture All RF modules have 16dB output. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME RF PLANT LAYOUT SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SOLEIL Storage Ring RF Solid State Amplifiers (SSA) SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME-SOLEIL Collaboration Two RF cavities had been received by SOLEIL from Elettra by the end of May2012. One of them has the HOM shifter while the other doesn’t. By visual inspection the cavities look in good shape but its cooling pipes need re-welding. Max. RF power through its input coupler is 60KW. Testing RF plant will be built consist of: 1.RF Cavity. 2.75KW amplifier. 3.Waveguides. 4.Cooling rack for cavity. 5.Shielding room for cavity operation. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Due to input coupler power limitations the two Elettra cavity will be used mainly for the phase1 commissioning of the SR. Max. stored current will be around 25mA. To operate the SR at 2.5GeV/400mA with extra 100KeV due to ID’s and 4 OVF would require each cavity to be able to handle 150KW. Other options are under investigation, i.e.:  EU cavity.  PEP2 cavity.  KEK damped cavity.  Elettra cavity with the new I/P coupler design. SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH SR Power Requirements

SESAME SR RF Cavities T w ± 0.1°C Power coupler  L cav Plung er Phase1: 2Elettra cavities with 60KW.max I/P Coupler Phase2: Chosen cavities should be capable to compensate the energy losses of about SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH KEK damped cavity used in the PF-ring.

Local Control Unit (LCU) Donated by Soleil From BESSY I Purchased by EU fund donation Ready System: SESAME Booster RF Plant and Local Control SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

The new 2kW Solid-State amplifier as replacement for the old klystron used in BESSY I Booster LLRF (from BESSY I) tested in the RF lab Booster 2KW RF Cavity (BESSY1) SESAME Booster RF Plant SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH

Thank You SESAME-TAC meeting Nov.2012 SESAME SR RF System – Darweesh FOUDEH