Noguchi Lecture WE303 - CERN · 2007. 10. 24. · Shuichi Noguchi,SRF2007,10.7 10 Saclay -1 :...

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.