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

Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 6

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

Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 9

50

41

Shuichi Noguchi ILC08 Chicago Nov. 18, 2008 10

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)