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Shuichi Noguchi,SRF2007,10.7 1
New Tunersfor ILC Cavity Application
Shuichi NoguchiKEK
Shuichi Noguchi,SRF2007,10.7 2
OutlineBrief IntroductionNew Tuners for ILC ApplicationElliptical CavityPulsed OperationHigh GradientLorentz Detuning Compensation( Cavity Deformation by Maxwell Stress )
Shuichi Noguchi,SRF2007,10.7 3
Frequency TunerRF Accelerating Cavities usually have Tuners.They are used to tune the Cavity Resonance Frequency, in order to minimize the reflected RF power, usually.Tuning Accuracy << Resonant Band WidthThey must cover the Wide Range of the Fabrication Error.Feed-back can be used in CW operation.
Shuichi Noguchi,SRF2007,10.7 4
Possible Error Sources
Fast in TransientOffsetSlowSlow
Slow
Static
Speed
Small Micro-Phonics ( Vibration )
ComparableLorentz De-tuningComparableDe-tuning OffsetComparableBeam Loading ( if φ is not 0 )
ComparableDrift ( Temperature, Pressure )
Very LargeFabrication Error
Magnitude/ Bandwidth
Error Sources
Shuichi Noguchi,SRF2007,10.7 5
Tuning Principle : by Slater
Volume Change of ΔV Frequency Change of Δf
( )
( )∫
∫
Δ
Δ
−≈
−+=
V
V
VdHEWf
fW
VdHE
22
0
22
20
2
41
21
μεδ
με
ωω
Shuichi Noguchi,SRF2007,10.7 6
Normal Conducting SuperconductingStretch / Squeeze
β~1
Piston Tuners
3000N/mm
Shuichi Noguchi,SRF2007,10.7 7
New TunersSeveral Candidates for the ILC Cavity
RequirementStroke > 2mm, Axial Force > 6000N
It must not move the Beam Axis.Compact and Reliable
Fast Response Piezo
Shuichi Noguchi,SRF2007,10.7 8
1 2 3
Booster
Under TestUnder TestUnder TestUnder Test
TTFExperience
GearScrewWedgeSlide JackWorm GearWorm GearLarge ScrewBall-ScrewScrewLeverBladeBlade
ScrewCam & LeverSaclay-2ScrewLeverLeverSaclay-1Booster-3Booster-2Booster-1Tuner
Drive (Motor)Piezo
3000N/mmNeed
Force Boosters
Common Configuration of Tuners
Shuichi Noguchi,SRF2007,10.7 9
Drive Force
Fixed Point Acting Point
Lever
He Jacket
Bellows
Lever Arm
Shuichi Noguchi,SRF2007,10.7 10
Saclay -1 : Operation Principle
Design by M. Maurier and P. Leconte based of the MACSE tuner design
ΔLscrew
ΔLarmsΔLcavity
Second Lever
First Lever
Motor
Notch to absorb Span Change
Support RodScrew
Shuichi Noguchi,SRF2007,10.7 11
Saclay-1 on a TTF Cavity
Double Lever Tuner Stiffness~ 100 N/μm
Second LeverFirst LeverTwo Piezos
Motor & Gear Screw
Shuichi Noguchi,SRF2007,10.7 12
Saclay – 2 : Cam & Lever
Cam
Lever Arm
Drive Screw
Motor& Gear
Shaft
Shaft Support
Shuichi Noguchi,SRF2007,10.7 13
Saclay - 2 : Cam & Lever
EccentricShaft (Cam)
Shaft Support with Piezo
He JacketLever Arm
Shuichi Noguchi,SRF2007,10.7 14
Shuichi Noguchi,SRF2007,10.7 15
Blade : Jack System
Shuichi Noguchi,SRF2007,10.7 16
Blade : Jack, Lever & Screw
LeverPiezo
Gear & Motor
Screw
Shuichi Noguchi,SRF2007,10.7 17
Blade Tuner 25 N/μm
Original DESY Revised INFN
Not Stiff, Fatigue of Blade, KS=13N/μm
Shuichi Noguchi,SRF2007,10.7 18
Ball Screw : Large Ball Screw
Shuichi Noguchi,SRF2007,10.7 19
Coaxial Ball Screw 500N/μmNeed Long Stroke Piezo, Fatigue of Blade
Shuichi Noguchi,SRF2007,10.7 20
Slide Jack : Roller Wedge & Screw
Caterpillar Roller Screw
Shuichi Noguchi,SRF2007,10.7 21
Slide Jack Tuner 290N/μm
Piezo Stack
Drive Shaft
Taper
Invar Rod
Caterpillar
Caterpillar
Shuichi Noguchi,SRF2007,10.7 22
Tesla-like STF Baseline Cavity Package
Pulse motor (outside)
Piezo elementReplaceable
Motor drive shaft
Titanium Jacket
2K He line Support base
Invar Rod
Slide Jack TunerNb/Ti Flange
Inside Magnetic Shield
Stiff Endplate
Fixed Coupler
Shuichi Noguchi,SRF2007,10.7 23
SummarySeveral Candidates for ILC ApplicationAfter Experimental Demonstration of Performances and Comparison from many Aspects, Decision will be done.Some of these Tuners can be used for other Application, with Simplified Design.