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FFAG cost optimization: 2.5-5 GeV Normal Conducting Ring

FFAG cost optimization: 2.5-5 GeV Normal Conducting Ring. C. Johnstone Muon Collaboration Meeting LBNL, Feb 13-17, 2005. Muon FFAG Issues. Number of turns  Phase-slip, Phase-slip  bend/cell; the number of cells remains fixed

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FFAG cost optimization: 2.5-5 GeV Normal Conducting Ring

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  1. FFAG cost optimization: 2.5-5 GeV Normal Conducting Ring C. Johnstone Muon Collaboration Meeting LBNL, Feb 13-17, 2005

  2. Muon FFAG Issues • Number of turns  Phase-slip, • Phase-slip  bend/cell; • the number of cells remains fixed • for a fixed extraction/injection energy ratio (=2 for current designs) • independent of acceleration energy • Implications: • Rings do not scale in cost with energy • 2.5 – 5 GeV ring is 60-80% cost of 10 – 20 GeV ring • A SC 2.5 – 5 GeV ring is not cost effective for only 2.5 GeV of acceleration

  3. Cost alternatives to 7T SC Rings: • Lower SC fields : 7T  4T • Single-turn vs. multiturn coils • SC is still too expensive for lowest-energy, 2.5 – 5 GeV ring • Low energy ring  15 Hz, Normal conducting • 1.5 T peak poletip field • 14 mil laminated magnets • 15 Hz resonant power supply • Cost estimates and designs exist based on large-acceptance proton driver designs by Chou, et. al. at Fermilab

  4. 2.5-5 GeV Normal Conducting FFAG FDF-triplet Circumference 566m #cells 100 cell length 5.663m rf drift 2m D-bend length 1.755m F-bend length 0.454m (2!) F-D spacing 0.5 m Central energy 5 GeV Peak poletip field 1.5 T F gradient 11.6 T/m D gradient 5.3 T/m F strength 0.698 D strength 0.32 Bend-field (central energy) 1.8 kG Orbit swing Low -8.0 High 0 C (pathlength) 15.5 cm  10 turns (xmax/ymax) for 2.5, 5 GeV ( 6.8/16.1) ( 6.5/12.3) (x/y) 2.5 and 5 GeV (0.37/0.37) (0.19/0.12)

  5. Cost estimates: Large-aperture PD Quadrupoles:1.2 m, 17.5 cm aperture, Tech Div. Fermilab M&S 10k* 13k* 45.6k* Labor total (1773 hrs, est) $ ~ 27k reduced labor rate by 2 from TDiv rate TOTAL, MAX $ 73K Scale to 13 cm aperture $ 54k NOTE: average magnet length is 1.1 m *Labor is at least a factor of 2 high at Fermi vs. industry

  6. 15 Hz, resonant main power source Cost estimate is for dipole and quadrupole main power supply network. Labor will be ~25k, giving $50k for a 15 Hz resonant main power supply

  7. Revised estimate for 2.5-5 GeV FFAG ring: magnets + power supply • Magnet cost: • 300 magnets x $54k = $16 Million • 15 Hz resonant power supply: • Single main supply: ~$100K

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