EMMA RF Systems At Daresbury Laboratory C Beard overview of the EMMA RF System Carl Beard ASTeC STFC Daresbury Laboratory FFAG 09 21 st to 25 th September 2009 ID: 915123
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Slide1
21st to 25th September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
overview of the EMMA RF System
Carl Beard
ASTeC, STFC Daresbury Laboratory
FFAG 09
21
st
to 25
th September 2009
Slide221st to 25
th September 2009
EMMA
ALICE Injection/ EMMA RF System
Specification
Optimal Solution
(unconstrained)
RF Systems (Affordable, low(
ish) risk solution)RF Cavity
High Power RF Amplifier SystemRF Distribution SystemLLRFCommissioning Progress2 Cavity High Power Tests
Waveguide Acceptance TestsIOT Amplifier Acceptance Tests
EMMA RF Systems At Daresbury Laboratory C Beard
Slide3ALICE (EMMA SRF Injector)
Parameter
Units
Nominal Gun Energy
200 -350
keV
Booster
Energy
7
MeV
Linac
Energy
3-13
MeV
RF Frequency
1.3
GHz
Nominal Bunch Charge
10 - 80
pC
Maximum Train Length
Single Bunch
Maximum Bunch Repetition Rate1-10Hz
21st to 25th September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide4EMMA Optimal
Solution
Unconstrained by
Size
Cost
Single SS Amplifier driving each cavity
Broadband
No RF distribution required
Phase locked loop per cavity/amplifier.
Improved Phase and Amplitude control
Parts would be cheap and quick to replace.
SS Amp + LLRF
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide5RF System Overview
High Power RF Amplifier System
Waveguide Distribution System
RF Cavities
Machine Parameters
Value
Units
Frequency
1.3
GHz
Number of Straights
21
Number of Cavities
19
Total Acc per Turn
2.3
MV
Upgrade
Acc per Turn
3.4
MV
Beam Aperture
40mmRF Pulse Length1.6mSRF Repetition Rate5-20HzPhase Control0.3°Amplitude Control0.3%21st to 25th September 2009EMMA RF Systems At Daresbury Laboratory C Beard
Slide6Cavity Design & Specification
Parameter
Value
Frequency (GHz)
1.3
Shunt Impedance (M
Ω
)
2.05
Q
o
20,000
R/Q (
Ω
)
100
Tuning Range (MHz)
-4.0MHz to +1.5MHz
Vacc
(kV)
Pdiss
(kW)3.68.5Ptot incl 30% Overhead* (kW)4.711.1Total Ring Power (kW)89.3210.9
* LLRF + Distribution
120
180
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide7RF Cavity
High Qo required ~20000 for 180kV
Compact ring - cavity length restricted to 110mm
Large beam aperture – 40mmTuner design provides 10MHz tuning range (reduce cost)
Input coupler – coaxial transmission Loop couplingNiowave supplying 20 cavities Four cavities successfully conditioned
One conditioned to 10kWThree conditioned to 5kW
Crosstalk seen on the pick-up probe
Resolved by rotating couplers by 180°
Input Coupler construction
(Times Microwave)
Tuning range 0- 25 mm
Cavity construction
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide8Cavity issues
Cross Talk between Coupler and pickupMeasured and SimulatedArtificially high QAll cavities delivered have been reset.
Tuner RF SpringOver time mechanism jamming
21
st to 25th September 2009EMMA RF Systems at Daresbury Laboratory C Beard
180
o
Rotation
Slide9High Power RF Amplifier
IOT
Circulator
Load
HVPS
Solid State Amplifier
Charging Capacitor
3, 19” racks
HVPS and charging capacitor
CPI IOT VKL-9130B
Tested to 100kW (broadband)
Bruker
solid state amplifier
Tested to 1.8kW (linear)
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide10High Power RF Amplifier
IOT gain typically >21dB
Solid state amplifier gain typically 61.8 dB
On-board Microprocessor-based controller, Accepts command inputs
Provide status outputsStatus reporting is near a “real-time” rateAcceptance tests September 2009
21st to 25
th September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide11Waveguide Distribution Scheme
Hybrid
Phase Shifter
7/8EIA Coaxial Cable
Cavity
Power split from the IOT with a 3.1dB hybrid
10 RF cavities anti-clockwise
9 RF cavities clockwise
Hybrid and Phase Shifter
H plane coupling method
Capacitive E plane tuner
Amplitude control
RF power from the IOT
Cavity frequency
Phase control
Cable length (fixed)
Phase shifter
System has completed its factory acceptance tests and has been delivered
21
st
to 25
th
September 2009EMMA RF Systems At Daresbury Laboratory C Beard
Slide12Waveguide Distribution Scheme
Compact Transmission Line
Fixed RF splitVaries along the line
40 dB directivity between portsIn-line circulator and loadPhase shifterDirectional coupler to monitor Fwd / Ref power
Transformer from Waveguide TE1,0 mode to coaxial TE1,1 modeHybrid & Phase Shifter
Example; 7 dB Splitter = 80% Transmission
20% of the power to the cavity.
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide1321
st to 25th September 2009
EMMA RF Systems at Daresbury Laboratory C Beard
High Power Tests
High Voltage Power SupplyIOT
Waveguide
Libera LLRF Control
2
CavityTest
DL Developed Capacitor charger power supply
CPI IOT 30 kW (
cw
)
Libera LLRF Controls system
Q-Par Angus – 3 dB hybrid
2 Niowave
Cavties
Tested to 5 kW per cavity
Cross talk between cavity and IOT Output Cavity
Circulator installed
Controlled to better than Design Specification
Simplest system
2 RF CavitiesSolid State DriveWater Cooling
Slide14EMMA LLRF
Provides the stabilisation of the accelerating fieldControls the amplitude and phase each of the cavities via;
Pick-up probes in the cavities
forward and reverse directional couplers on each of the hybrid and phase shifter waveguide modules,
the forward and reverse power levels from the IOT, before and after a circulator,the forward and reverse power levels from the solid state driver
LLRF tests performed using an I-Tech Libra system
In-built FD Network analyserRapidly understand problems with the transmission line, without connecting other equipment
21
st
to 25
th
September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide15LLRF 2 Cavity Commissioning
Performance achieved at 5kW (~150kV) per cavity
Phase: 0.0093º (spec is 0.3º) Amplitude: 0.006% (spec is 0.3%)
Achieved with only 2 cavitiesDegradation as more cavities are included in the system
Simulink model show it is possible, howeverFinal operating parameters will only be demonstrated once the 19 cavity system is built.Issue seen with a double hump response
Resolved with the inclusion of a circulator
Libera Unit Delivered – Software due
21st to 25th September 2009
EMMA RF Systems at Daresbury Laboratory C Beard
No circulator
Circulator
Slide1621st to 25th September 2009
EMMA RF Systems at Daresbury Laboratory C Beard
Slide17Summary
EMMADesign completedProcurement
RF Cavities 16 (20) deliveredRe-configured
Waveguide distribution deliveredIOT Acceptance Tests completedDelivery Due End September
LLRF System DeliveredFinal iterations on the SoftwareEMMA RF installation commencing October 2009……RF Commissioning.
21st to 25th September 2009
EMMA RF Systems At Daresbury Laboratory C Beard
Slide18AcknowledgementsSTFC
Neil Bliss, Adam Bozson, Peter Corlett, Paul Dickinson, Ken Dilworth, Andy Goulden, Philippe Goudket, Steve Griffiths, Clive Hill, Peter McIntosh, Andy Moss, Bruno Muratori, Joe Orrett, Yuri Saveliev, Tom Weston, Alan Wheelhouse.
I-Tech & DimTel – LLRF
Niowave Inc – CavityQ-Parr Angus – RF DistributionCPI – RF Amplifier
21st to 25th September 2009EMMA RF Systems at Daresbury Laboratory C Beard