Christopher Nantista ISG-X SLAC June 17, 2003
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1 Christopher Nantista ISG-X SLAC June 17, 2003
2 8-Pack Phase II NLC/JGLC R2 requirement: a linac subunit test rf power distribution dual-moded SLED-II eight 60cm structures Goals: Transport several hundred megawatts of X-band rf Divide power between structures Test novel components at full power/full rep rate Gain experience in NLC/JLC rf distribution system design
3 8-Pack Dual-Moded SLED-II Pulse Compression System 8-Pack Phase I RF System klystrons 200 MW, 1600 ns WR90 directional coupler height taper dual-mode combiner reflective TE 01 TE 02 mode converter / tuning plunger dual-mode-preserving taper TE 01 TE 02 TE 02 TE 01 T/4 T/4 iris mode mixer mode-preserving taper (TE 02 cutoff at small end) dual-mode directional coupler TE 01 or TE 11 jog-converter H-plane bend rect-circ taper cross potent TE 01 or TE 11 (unsleded) dual-mode splitter bend-converter load trees ~576 MW, 400 ns
4 8-Pack RF Power Budget XL4 klystrons: 4 50 MW =200 MW transmission to SLED-II:.90 SLED-II gain: MW transmission to structures: MW 8 ~ MW/structure
5 Mode Stripper Phase-I configuration carries misphased/mismatched input power past SLED-II to the load tree in the TE 11 (TE 10 ) mode. To continue the distribution system single-moded, we provide a separate matched path for this power into loads. to accelerator distribution to loads width taper jog converter circular-to-rectangular taper on each port TE 20 TE 576 MW: E s max = ~48.5 MV/m
6 TE 01 Attenuation in Transfer Lines WC159: db/m (0.9%/m) WC293: db/m (0.1%/m) So, if going along the bunker, across the roof, down into the bunker and along the accelerator amounts to ~10 m, the cost of staying in WC159 could approach 8% of the power.
7 TE WC293 Diameter Step Taper diameter length step step WC160
8 Bends 90º bends in WC293 are composed of: diameter step tapers, circular-to-rectangular tapers, and an overmoded, overheight rectangular waveguide H-plane bend. Since we are no longer dual-moded, there is no H-plane/E-plane distinction, and we can use this bend to turn in any orthogonal direction rectangular TE MW: E s max = ~36.3 MV/m TE 576 MW: E s max = ~36.0 MV/m
9 Mode Stripper and Transfer Line
10 TE 01 Tap-Off Sergey Kazakov a Rx OR: Dividing ratio can be changed by using two irises.
11 Magic-H 576 MW: E s max = ~44.7 MV/m C. Nantista
12 New Kazakov 576 MW: E s max = ~39.0 MV/m S. Kazakov 03
13 -4.77 db (1/3) Directional Coupler MW: E s max = ~44.7 MV/m C. Nantista 03
14 Compact TE 10 -TE 20 Transformer * Replaces: mitred bend width taper jog converter rect. taper section of rect.-circ. taper matched to circ.-rect. taper 576 MW: E max = 45.4 MV/m * inspired by Sergey Kazakov s converter for TE 01 /TE 02 window.
15 Alternate TE 10 -TE 20 Transformer % lower surface electric 576 MW: E max = 38.0 MV/m S. Kazakov 03
16 576 MW E s max = ~ 39 MV/m E s max = ~ 45 MV/m (15% higher)
17 Height Taper ( ) blended arc height 130 MW E s max = ~33.0 MV/m septum height taper S. Tantawi C. Nantista 130 MW E s max = ~43.1 MV/m
18 Feeding Options A) WC293 pump T diameter step taper 6 db height taper WC160 pump T load 4.8 db WC293 TE01-TE20 circ.-rect. tapers load WC160 TE20-TE10 bend converter WR90 WR90 E-plane bend WR90 pump T H-plane bend 0.6m structures quad B) greater potential for resonance problems in parallel transmission lines. binary distribution limits configuration possibilities. WC293 pump T TE20-TE10 jog converter width taper diameter step taper WC160 WR90 height taper WC293 WR90 TE01-TE20 circ.-rect. tapers load WC160 pump T TE20-TE10 bend converter E-plane bend WR90 pump T H-plane bend 0.6m structures quad
19 Phase 2 8-Pack Layout Schematic of the power handling to the beamline From SLED likely Kazakov hybrid and directional coupler variants with TE 10 -TE 20 transformers Mechanical/vacuum system in design Overmoded 6 db 4.8 db magic-h hybrids WR90 slide from D. Schultz
20 Distribution
21 Conclusions The 8-Pack Phase-II rf distribution system rf design is largely done, with a few details yet to be decided on. (who, what, where, when, why, how?) It is a collaborative effort between SLAC and KEK. Mechanical design and fabrication has begun. Installation should begin in October and finish in early November.
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