EUROnu 3rd Annual Meeting, 18-21 Jan. 2011, STFC RAL, Didcot, UK. Production Ring for 8 Li and 8 B. Elena Benedetto NTU-Athens & CERN. Acknowledgements: M. Schaumann, T. Weber, J. Wehner (RWTH Aachen),
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EUROnu 3rd Annual Meeting, 18-21 Jan. 2011, STFC RAL, Didcot, UK
Production Ring for 8Li and 8B
NTU-Athens & CERN
Acknowledgements: M. Schaumann, T. Weber, J. Wehner (RWTH Aachen),
G. Arduini, J. Barranco, C. Bracco, M. Chanel, P. Chiggiato, C. Hansen, R. Garoby, B. Holzer, V. Previtali, F.Schmidt, V. Vlauchoudis, E. Wildner (CERN),
D. Neuffer (FNAL), O. Boine-Frankenheim (GSI), A. Koukaz (Munster U.)
Y. Mori, K. Okabe (KURRI), M. Cianausero, P. Mastinu, V. Kravchouk, (INFN, Legnaro), ...
stripper, target & absorber
→ C.Rubbia et al, NIM A 568 (2006) 475–487
→ D. Neuffer, NIM A 585 (2008) 109
→ Y.Mori, NIM A 562 (2006) 591
0.4 for 6Li
0.01 for 7Li
→ Transverse emittance shrinks
→ Dispersion & wedge-shaped target
NOT OPTIMIZED YET
M. Schaumann, Aachen
SixTrack (collimation version)
Developed @ CERN for dynamic aperture and collimations tracking
Fully 6D, higher order Taylor truncation, reads lattice form MADX
Target implemented as a special collimator element:
Analytical formulae for Multiple Coulomb Scattering and Energy Losses (benchmarked w. Geant4 simulations (J.Wehner, Aachen))
Coupling w. MonteCarlo code FLUKA ongoing
→ V.Vlauchoudis, D.Sinuela, E.B. (CERN)
Rms emittances & Intensity evolution diagnostics
SixTrack is for protons
→ need proton equivalent ring (same Br, same Dp/p recovered in RF)
Benckmark w.MADX / PTC → OK!
→ Capacitive loaded cavities(e.g. CERN ACOL bunch rotator or ERIT-FFAG cavity)
Meeting at GSI, 29/10/09
Factor 104 larger !!! then exisiting targets
Such gas-jet target densities would be OK in fusion or space applications,
BUT we need good vacuum for the RF cavity!
→ do we still need to stopping + diffusion/effusion?
→ or... (electrostatic) separator?
→ see Y. Momozaki, J. Nolen, C. Reed, V. Novick, J. Specht. Development of a liquid lithium thin film for use as a heavy ion beam stripper. Journal of Instr., 4(04):P04005, 2009.
8Li/8B emitted at q~10o similar energy as projectile
Supersonic jet target
Efficient cooling removal
Collection + diff./effusion
30oemission angle and smaller velocity
Larger M.C. Scattering
Cooling / jet instabilities
→ T.Weber (RTWH Aachen) & E.B.
← 8Li production (D beam)
↓ 8B production (3He beam)
Schematic layout of FFAG-ERIT
K.Okabe et al, IPAC10, EPAC08,...
<0 → blow-up
If now we introduce Dispersion (and a triangular target shape):
at a different orbit Dx=D Dp/p
0.4 for 6Li
0.01 for 7Li
If now we introduce Dispersion (and a triangular target shape):..
Cooling can be transferred from transverse to longitudinal thanks to
Dispersion + triangular target
can also introduce coupling x-y
Since sum of the three partition number is always the same, is computed for Dx=0:
Due to Bethe-Bloch shape, NO possibility to effectively cool → but only to keep a constant emittance or not to heat it “too much”
We need to produce (and collect!!!) 2-3 1013 (x5) ions/s
Stolen from K.Okabe’s presentation