Shuichi Noguchi,SRF2007,1 0.7 1 New Tuners for ILC Cavity Application Shuichi Noguchi KEK
Jan 16, 2016
Shuichi Noguchi,SRF2007,10.7 1
New Tunersfor ILC Cavity Application
Shuichi Noguchi
KEK
Shuichi Noguchi,SRF2007,10.7 2
Outline Brief Introduction New Tuners for ILC Application
Elliptical Cavity
Pulsed Operation
High Gradient
Lorentz Detuning Compensation
( Cavity Deformation by Maxwell Stress )
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Frequency Tuner RF 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 Width They must cover the Wide Range of the
Fabrication Error. Feed-back can be used in CW operation.
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Possible Error SourcesError Sources Magnitude
/ Bandwidth
Speed
Fabrication Error Very Large Static
Drift ( Temperature, Pressure ) Comparable Slow
Micro-Phonics ( Vibration ) Small Slow
Beam Loading ( if is not 0 ) Comparable Slow
De-tuning Offset Comparable Offset
Lorentz De-tuning Comparable Fast in Transient
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Tuning Principle : by Slater
Volume Change of ΔV Frequency Change of Δf
V
V
VdHEWf
f
W
VdHE
22
0
22
20
2
4
1
21
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Normal Conducting SuperconductingStretch / Squeeze
~1
Piston Tuners
3000N/mm
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New Tuners Several Candidates for the ILC Cavity
RequirementStroke > 2mm, Axial Force > 6000N
It must not move the Beam Axis.Compact and Reliable
Fast Response Piezo
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1 2 3
Booster
Tuner Booster-1 Booster-2 Booster-3 Experience
Saclay-1 Lever Lever Screw TTF
Saclay-2 Cam & Lever Screw Under Test
Blade Blade Lever Screw Under Test
Ball-Screw Large Screw Worm Gear Worm Gear Under Test
Slide Jack Wedge Screw Gear Under Test
Drive (Motor)Piezo
3000N/mm Need Force Boosters
Common Configuration of Tuners
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Drive Force
Fixed Point Acting Point
Lever
He Jacket
Bellows
Lever Arm
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Saclay -1 : Operation Principle
Design by M. Maurier and P. Leconte based of the MACSE tuner design
Lscrew
LarmsLcavity
Second Lever
First Lever
Motor
Notch to absorb Span Change
Support RodScrew
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Saclay-1 on a TTF Cavity
Double Lever Tuner Stiffness~ 100 N/m
Second LeverFirst LeverTwo Piezos
Motor & Gear Screw
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Saclay – 2 : Cam & Lever
Cam
Lever Arm
Drive Screw
Motor & Gear
Shaft
Shaft Support
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Saclay - 2 : Cam & Lever
EccentricShaft (Cam)
Shaft Support with Piezo
He JacketLever Arm
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Blade : Jack System
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Blade : Jack, Lever & Screw
LeverPiezo
Gear & Motor
Screw
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Blade Tuner 25 N/m
Original DESY Revised INFN
Not Stiff, Fatigue of Blade, KS=13N/m
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Ball Screw : Large Ball Screw
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Coaxial Ball Screw 500N/mNeed Long Stroke Piezo, Fatigue of Blade
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Slide Jack Tuner Roller Wedge & Screw
Caterpillar Roller Screw
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Slide Jack Tuner 290N/m
Piezo Stack
Drive Shaft
Taper
Invar Rod
Caterpillar
Caterpillar
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Tesla-like STF Baseline Cavity Package
Pulse motor (outside)
Piezo element Replaceable
Motor drive shaft
Titanium Jacket
2K He line Support base
Invar Rod
Slide Jack TunerNb/Ti Flange
Inside Magnetic Shield
Stiff Endplate
Fixed Coupler
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Summary Several Candidates for ILC Application After 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.