Shuichi Noguchi, KEK6-th ILC School, November 20111 Auxiliary Components Input Power Coupler HOM...

Shuichi Noguchi, KEK 6-th ILC School, November 2011 1

Auxiliary Components Input Power Coupler HOM Dumping Coupler Frequency Tuner He Jacket Magnetic Shield Cryostat ; Assembly & Alignment

Part-2


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 / Pre-tuning Error. Feed-back can be used in CW operation.


Detuning Effect Input Power ReflectionCavity Field Phase Change

2

0

02

2

2

0

0

2

0

41

14

,

4111

114

L

nin

L

nnin

nin

g

nn

QQQ

Q

QQQ

QQ

P

PT


Phaser Diagram

gV~

exp(jt)

in

Lggr Q

Q

Q

RPV

2

2~

90o

jVV grg expcos~~

AngleDetuning;,2tan0

0

LQ


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


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


Normal Conducting SuperconductingStretch / Squeeze

～１

Piston Tuners

3000N/mm


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 Tested

Slide Jack Wedge Screw Gear STF

Drive (Motor)Piezo

3000N/mm Need Force Boosters

Common Configuration of Tuners


Drive Force

Fixed PointWith Bearing Acting Point

Lever

He Jacket

Bellows

Lever Arm


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 Rod

Screw


Saclay-1 on a TTF Cavity

Double Lever Tuner Stiffness~ 100 N/m

Second LeverFirst LeverTwo Piezos

Motor & Gear Screw


Saclay – 2 : Cam & Lever

Cam

Lever Arm

Drive Screw

Motor 　＆　Gear

Shaft

Shaft Support


Saclay - 2 : Cam & Lever

EccentricShaft (Cam)

Shaft Support with Piezo

He JacketLever Arm


Blade : Jack System


Blade Tuner 25 N/m

Original DESY Revised INFN

Not Stiff, Fatigue of Blade, KS=13N/m


Blade : Jack, Lever & Screw

LeverPiezo

Gear & Motor

Screw


TTF Blade Tuner


Geometry of the revised tuner 3.9.4

the piezo positions correspond to the double blade packs: as seen these packs withstand an higher load and therefore they were doubled.


The ILC Blade TunerOn the basis of the test results here presented the ILC Blade Tuner prototype is already close to fulfill all the XFEL and ILC specifications.

The experience gained with the cold tests on the so called 3.0.0 prototype has been used for the final revision of the Blade Tuner, currently under construction.

The first 8 units for Fermilab have been produced and 2 more are under construction.

Double Piezo


Ball Screw : Large Ball Screw


A prototype coaxial ball screw tuner


Coaxial Ball Screw 500N/mNeed Long Stroke Piezo, Fatigue of Blade


Slide Jack Tuner Roller Wedge & Screw

Caterpillar Roller Screw


Slide Jack Tuner 290N/m

Piezo Stack

Drive Shaft

Taper

Invar Rod

Caterpillar

Caterpillar


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


Coupler Opening

Piezo can be replaced


Stroke　of　Motor　Tuner

Cryomodule　-　C Cryomodule　-　A

Trouble　of　two　motor　tuners　occurred　inC2/ACC011　(Blade)　and　A4/MHI-09　(Slide-Jack/end)　!!


A4 (MHI#9) frequency shift @ 1299[MHz]

958000

958100

958200

958300

958400

958500

958600

0 50 100 150 200 250 300 350 400 450 500

Vpiezo [V]

Fre

qu

ency

[H

z]

1st cycle

2nd cycle

A3 (MHI#7) frequency shift @ 1300[MHz]

11200

11250

11300

11350

11400

11450

11500

0 50 100 150 200 250 300 350 400 450 500

Vpiezo [V]

Fre

qu

ency

[H

z]

1st cycle

2nd cycle

A2 (MHI#6) ) frequency shift @ 1300[MHz]

25850

25900

25950

26000

26050

26100

26150

26200

26250

26300

26350

0 50 100 150 200 250 300 350 400 450 500

Vpiezo [V]

Fre

qu

ency

[H

z]

1st cycle

2nd cycle

A1 (MHI#5) ) frequency shift @ 1300[MHz]

7400

7450

7500

7550

7600

7650

7700

0 50 100 150 200 250 300 350 400 450 500

Vpiezo [V]

Fre

qu

ency

[H

z]

DC　Response　of　Piezo　Tuner　(Cryo-A)

50Hz/div 50Hz/div

100Hz/div

50Hz/div

50W　RF　Amp.　+　PLL　　(Vpiezo　=　0　~　+500V)

200Hz

200Hz

350Hz

450Hz

A1;MHI-05KEK

A3;MHI-07KEK

A2;MHI-06KEK

A4;MHI-09KEK


Pulse　Response　by　Pezo　Tuner　　(Cryo-A)

Piezo　Drive　Frequency　=　250　Hz

Pt

Piezo　Drive　Pulse(freq.,　Vpp)

Single　Pulse　Response(parameters　;　　frequency　　　　　　　　　　　　　　　　　　　　　　　　　;　　amplitude　　　　　　　　　　　　　　　　　　　　　　　　　;　　delay　time)


He Jacket & Lorentz Detuning

Shuichi Noguchi, KEK6-th ILC School, November 20111 Auxiliary Components Input Power Coupler HOM...

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