Linac and Damping Ring Designs for the FCC-ee

Ogur, Salim; Barnyakov, Alexey; Chaikovska, Iryna; Chehab, Robert; Furukawa, Kazuro; Iida, Naoko; Kamitani, Takuya; Levichev, Alexey; Martyshkin, Pavel; Miyahara, Fusashi; Nikiforov, Danila; Oide, Katsunobu; Ozcan, Erkcan; Papaphilippou, Yannis; Polozov, Sergey; Rinolfi, Louis; Yaman, Fatih; Zimmermann, Frank

doi:10.18429/JACoW-IPAC2019-MOPMP002

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RIS citation export for MOPMP002: Linac and Damping Ring Designs for the FCC-ee

TY  - CONF
AU  - Ogur, S.
AU  - Barnyakov, A.M.
AU  - Chaikovska, I.
AU  - Chehab, R.
AU  - Furukawa, K.
AU  - Iida, N.
AU  - Kamitani, T.
AU  - Levichev, A.E.
AU  - Martyshkin, P.V.
AU  - Miyahara, F.
AU  - Nikiforov, D.A.
AU  - Oide, K.
AU  - Ozcan, E.V.
AU  - Papaphilippou, Y.
AU  - Polozov, S.M.
AU  - Rinolfi, L.
AU  - Yaman, F.
AU  - Zimmermann, F.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Linac and Damping Ring Designs for the FCC-ee
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - We report the design of the pre-injector chain for the Future Circular e⁺ e⁻ Collider (FCC-ee) system. The electron beam from a low-emittance RF gun is accelerated by an S-band linac up to 6 GeV. A damping ring at 1.54 GeV is required for emittance cooling of the positron beam. The intermediate energy step from the exit of the S-band linac at 6 GeV to the 20 GeV injection energy of the top-up booster can be provided by the modified Super Proton Synchrotron (SPS), serving as a pre-booster ring (PBR). An alternative option to reach 20 GeV energy would be to extend the S-band linac with a C- or X-band linac. An overall cost optimisation will determine the choice of the final configuration. Beam loss and emittance dilution in the linac due to space charge effects, wakefields, and misalignment of accelerator components can be mitigated by RF phasing and orbit steering. Start-to-end simulations examine the beam transport through the linac up to either 6 GeV or 20 GeV. The results indicate large design margins. Simulations of the beam dynamics in the damping ring (DR) demonstrate a sufficiently large momentum acceptance. Effects of intrabeam scattering and electron cloud instability in the DR are also studied.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 420
EP  - 423
KW  - linac
KW  - emittance
KW  - positron
KW  - gun
KW  - electron
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPMP002
UR  - http://jacow.org/ipac2019/papers/mopmp002.pdf
ER  -