Cavity Package for STF Phase - 2
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Transcript of Cavity Package for STF Phase - 2
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 1
Cavity Package for STF Phase - 2
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 2
STF Phase-2 & GS1 PackagePhase-1 Phase-2
Cavity Length 1258mm 1247mm
Beam Pipe
HOM Coupler
84mm 80mm
Machining Deep Drawing
Hydro-forming
HOM Orientation Left–Right Symmetric Up-Down Sym.
He Jacket End-cone Machining Press-forming
Tuner Position Between Supports Outside of
Supports
Input Coupler Fixed Coupling Tunable
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 3
Improvement in the STF Baseline Cavities
Stiffness of Cavity Fixing Support 72 kN/mm 22 kN/mmLorentz Detuning -520 Hz -870 Hz (31.5 MV/m)
TTF Cavity
Inside M – Shield. Thick Titanium Baseplate,Thick Nb Beam Tube & Thick Nb End-cell
STF Baseline Cavity
Cell Taper13 deg. → 10 deg.
Beam Tube78 → 84
Input Port40 → 60
STF Baseline Cavity TTF CavityFz
Fr
80
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 4
Fabrication of STF Baseline CavitiesCenter-cells
(Tokyo Denkai ; RRR~300 Nb)
End-groupsHOM coupler
Four cavities were fabricated by MHI (Mitsubishi Heavy Industries)
Magnetic Shield
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 5
Deep-drawing of Pipes
Fe Al
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Nb
Cu
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 7
Hydroforming of Coupler Port
Niobium Niobium
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 8
New Tuner Configuration
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50
41
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Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 11
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
Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 12
Input Coupler for STF Baseline Cavities
5K cooling80K cooling
Beam pipe
Warm window
Doorknob 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
Improved design for simplicity with no tuning mechanism.
(KEKB 1 MW/cw, JPARC-ADS 2.2 MW/pulse, SNS)