Shuichi Noguchi,SRF2007,10.71 New Tuners for ILC Cavity Application Shuichi Noguchi KEK.
Part III ILC BCD Cavity
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Transcript of Part III ILC BCD Cavity
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Part III ILC BCD Cavity
Maximum Use of Potential Performance Maximum Use of each Cavity Performance Maximum Availability
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Hayama ILC Lecture, 2006.5.23, Shuichi Noguchi
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Problems of Cavityfor ILC Application
Large Scatter of Maximum Gradient Large Dynamic Lorentz Detuning Long MTBF for Critical Components > 20 years --- < 5 % / year
Maximum Use of Potential Performance Maximum Use of each Cavity Performance Maximum Availability
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Common Numbers are necessary Number of Spare Cryomodules < 30 How many modules can we replace in a schedul
ed shutdown ? MTBF / Life Time ? How many critical component in a cryomodule ? Number of cavities to be repaired in a year < ? How is the lowest gradient we have to operate ? Distribution of the Max. Gradient Where do we set the threshold gradient ?
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ILC BCD Cavity Parameters ILC BCD Cavity I=10mA, 1.5msec. X 5Hz ACD
Idea Problem Comments Material Niobium Bulk Well Established Nb/Cu Clad, Single Crystal
Frequency 1.3GHz Lower Frequency
Operating Temperature 2 k Number of Cell 9 >9, Super Structure
Gradient 31.5 MV/m Performance Scatter 35 MV/m
Duty 1.5 msec. X 5 Hz Pulse Operation Dynamic Lorentz Detuning Cell Shape Elliptical Low loss
Iris Aperture 70 mm Smaller Aperture
Wall Thickness 2.8 mm Need Stiffener
Input Coupler Double Window Coaxial Tunable Coupling Complex Many Candidates
HOM Coupler High Pass + λ/ 4 Filter Compact Jacket Not Stiff Tuner Not Stiff Many Candidates
Magnetic Shield Outside of Jacket High Temperature Treatment Inside of Jacket
Vacuum Seal Al Alloy Hexagon
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DESY
Cavity Support System is weak.
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Scatter of Maximum Gradient
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First Test Before Installation
After Installation
Gradient Distribution
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Lorentz ( Maxwell ) Detuning
S
22
kk0
kmode
k
KBA
aa
accacc
l
EldfdE
FFdld
ldfdfff
Kjacket
K tuner
K cavityF FFzFr
TESLA Blade
STF Slide Jack
STF Ball Screw
A Hz/(MeV/m)2 0.5 0.5 1.2
B N/(MeV/m)2 0.047 0.047 0.051
df/dl Hz/μm 320 320 370dF/dl N/μm 3 3 1.8KS N/μm 13 80 60
Kjacket N/μm 26 96 58Ktuner N/μm 26 500 1700
Δf (30MV/m) Hz 1490 620 1360Fine Tuning
Stroke μm 3.7 1 2.9
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Mechanical Oscillation Modes
Multi-cell Mode (I)f = 87 Hz
Multi-cell Mode (II)f = 169 Hz
Tuner Mode f = 294 Hz
Single-cell Modef = 3.91 kHz
972MH Cavity
Tuner
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Stiff Jacket Baseplate (Ti)
Thick Titanium Baseplate No Stiffener
2.8 t 3.5 t
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Dynamic Lorentz DetuningResults at TTF
Pkly < 10 % → Detuning angle < 12 deg. , f < 46Hz
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TTF Lever Arm Tuner
Top Heavy
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TTF Blade Tuner
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Slide Jack Tuner
Piezo Stack
Drive Shaft
Taper
Invar Rod
Roller
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Tuner and Jacket
Input Coupler Port
Piezo Stack
Slide Jack
Drive ShaftTitanium Jacket
Support Base
Invar Rod
2K He Line
Motor OutsidePiezo Replacement OK
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A prototype coaxial ball screw tuner
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Input Coupler
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TTF-3 Coupler
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Input Coupler for Baseline Cavity
5K cooling here80K cooling here
Beam pipeWarm window
Door-knob conversion
Cold window
Vacuum port
TRISTAN Type Coaxial Disk Ceramic
80 K 5 K 2 KStatic Loss 5 W 1.1 W 0.05 WDynamic Loss 3 W 0.2 W 0.03 W
Qext = 2.0 x 106
Prf = 350 kW
An improved input coupler design for simplicity with no tuning mechanism.
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Components for High Power Test Stand
Input Couplers Doorknobs
Coupling Waveguides
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Coupler Opening
Piezo can be replaced
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HOM Coupler
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Gradient Control
U(t)V(t)ωV(t)dtd
Qω)
QQj(1V(t)
dtd 2
oL
o
o
L2
2
)tan(exp)(exp)~~(~~ tT
jTtVVVV
FFdod
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jt
Tj
TtQ
QRPV
FFog expcostanexpexp1
12 2
jQ
QRIjQ
QRPV obog expcos
11exp
12 2
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Input Power Error
Coupling Error
Tuning Error
Phase Error
Cavity Voltage Error & Gain Reduction
Beam Phase
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Item Device Pros Cons CostPower Variable
DividerPower Efficient Can be equipped after
Necessary for other Cavities
Second Divider
Can be equipped after
Space, Not Power Efficient
Qin
Tunable Coupler
ComplicatedCan not be equipped afterwards
3-Stube Tuner
Can be equipped after Performance Measurement
3-Motors Most Expensive
Phase Shifter
Can be equipped after Performance Measurement
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Rough Cost 30% 50% 70% 100%
Control Replace by Fix WG Need U-Part
Replace by Tunable WG Manual
Replace by Tunable WG
Remote
Power Add Second
Divider Fix Need Space
Manual Remot
e Replace Divider Fix *** Manual *** Remot
e ***
Coupling Add 3-Stub Tuner Fix Need Space
Manual All from the beginning
Remote
Tunable Coupler Manual *** *** *** All from the
beginningRemot
e *** *** ***