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21 st  to 25th September 2009 21 st  to 25th September 2009

21 st to 25th September 2009 - PowerPoint Presentation

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21 st to 25th September 2009 - PPT Presentation

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

emma september daresbury systems september emma systems daresbury laboratory beard cavity 2009 power system amplifier cavities phase llrf high

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Presentation Transcript

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

Slide2

21st 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

Slide3

ALICE (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

Slide4

EMMA 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

Slide5

RF 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

Slide6

Cavity 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

Slide7

RF 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

Slide8

Cavity 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

Slide9

High 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

Slide10

High 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

Slide11

Waveguide 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

Slide12

Waveguide 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

Slide13

21

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

Slide14

EMMA 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

Slide15

LLRF 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

Slide16

21st to 25th September 2009

EMMA RF Systems at Daresbury Laboratory C Beard

Slide17

Summary

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

Slide18

AcknowledgementsSTFC

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