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

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

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

SESAME STORAGE RINGRF-SYSTEM

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

SESAME SR MAIN PARAMETERSParameter Value

Energy 2.5 GeV

Circumference 133.20 m

RF frequency 499.654 MHz

Radiation loss/turn 605 KeV

Beam current (maximum) 400 mA

Beam power loss (bare machine)

242 kW

Harmonic number 222

Momentum compaction factor 0.00828

Total RF voltage (maximum) 2.4 MV

Over voltage factor 4

Number of cavities 4

Energy acceptance 1.45 %

Synchrotron frequency 37 KHz

Synchronous phase 165.5 º

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Parameter Booster Storage ring

RF frequency 499.654 MHz 499.654 MHz

Harmonic number 64 222

Circumference 38.4 m 133.20 m

Revolution freq. 7.807 MHz 2.25 MHz

RF wavelength 0.600 m 0.600 m

Coincidence freq. 70.334 KHz

SESAME RF Layout and Main Parameters

SESAME SR RF System

SESAME-TAC meeting Nov.2012– 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 SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Main Oscillator500 MHz

Local Oscillator20 MHz

ADC

ADCFPGAFPGA

DSP/PIDDSP/PID

DAC

DACAmp

520 MHz

500 MHz (Cavity Signal)

IF

IF

20 MHz

20 MHz

Digital Clock (80 MHz)

Cavity

Cavity Tuning Stepper Motor

500 MHz (Forward Signal)

500

MHz

520 MHz

520 MHz

Digital IQ Demodulation

Proposed Digital LLRF System

SESAME SR RF System

SESAME-TAC meeting Nov.2012– 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 LLRFSESAME SR RF System

SESAME-TAC meeting Nov.2012– 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 PL

VSWR @225MHz P.Oper & PL 1200W; 1400

GainD

%

10-500 1200 13:1 24dB 7010-500 1400 65:1 23.5 69

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

SESAME SSA main block showing:•Power transistor with the surrounding circuit.•2KW circulator on the output with (495-505) MHz BW.•350W dummy load.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– 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 650W@500MHz for both groups.

BLF578 Module

Dissipated Power W

S11

dBGaindB

%

%

Phase Shift

380 -50 16.3 63 3.2 25

BLF578XR Module

Dissipated Power W

S11

dBGaindB

%

%

Phase Shift

517 -54 15.4 55 1.8 -31

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Gain vs. Pout for each module•BLF578: 16.3 dB.•BLF578XR: 15.4 dB.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Efficiency vs. Pout•BLF578: 63%.•BLF578XR: 55%.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Module BLF578#1 gain tests with respect to VDS voltage

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Module BLF578#1 efficiency tests with respect to VDS voltage

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Gain & Efficiency vs. combined power of the BLF578 modules Efficiency vs. pout Prototype _8 modules_BLF578

0

10

20

30

40

50

60

70

0 1 2 3 4 5 6

Pout(kW)

Eff

icie

nc

y (

%)

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

G & η vs. output power: combined output power of 6LF578 + 6BLF578XR

SESAME SR RF System

SESAME-TAC meeting Nov.2012– 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.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

DC-DC converter300V–to- 50V

RF tower power supply implemented in SOLEIL

RF tower power supply will be implemented in SESAME; 220ACV-to-50VDC/2KW.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

4.8KW

24W0.6W

600W120W3W

38.4KW

000

4.8KW

600W120W 3W

24W

0.6W38.4KW

2-WayCombiner

76.8KW

SESAME 75KW tower Solid State Amplifier architecture

All RF modules have 16dB gain@600W output.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

SESAME RF PLANT LAYOUTSESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

SOLEIL Storage Ring RF Solid State Amplifiers (SSA)

SESAME SR RF System

SESAME-TAC meeting Nov.2012– 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 SR RF System

SESAME-TAC meeting Nov.2012– 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.

SR Power Requirements

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

SESAME SR RF Cavities

Tw ± 0.1°C

Power coupler

LLcaca

vv

PlungerPhase1: 2Elettra cavities

with 60KW.max I/P CouplerPhase2: Chosen cavities should be capable to compensate the energy losses of about 700KeV@400mA

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

KEK damped cavity used in the PF-ring.

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

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 SR RF System

SESAME-TAC meeting Nov.2012– 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 SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH

Thank You

SESAME SR RF System

SESAME-TAC meeting Nov.2012– Darweesh FOUDEH