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 )　

Shuichi Noguchi,SRF2007,10.7 3

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.