EIC & FCC-ee common elements of collider rings

M. Benedikt (CERN), M. Blaskiewicz (BNL), A. Blondel (U. Geneva & CNRS), M. Boscolo (INFN-LNF), H. Burkhardt (CERN), M. Chamizo Llatas (BNL), W.

Fischer (BNL), J. Fox (Stanford U.), C. Garion (CERN), D. Gassner (BNL), F. Gerigk (CERN), E. Gianfelice (FNAL), C. Hetzel (BNL), W. Höfle (CERN), E.

Jensen (CERN), R. Kersevan (CERN), M. Koratzinos (MIT), T. Lefevre (CERN), E. Levichev (BINP), F. Lin (JLab), T. Mastoridis (Cal Poly), G. McIntyre (BNL), M.

Migliorati (Sapienza), A.-S. Müller (KIT), A. Novokhatski (SLAC), K. Oide (CERN and KEK), D. Padrazo (BNL), B. Parker (BNL), V. Ptitsyn (BN), R. Rimmer (JLab), T. Satogata (JLab), A. Seryi (JLab), E. Shaposhnikova (CERN), K. Smith (BNL), M. Sullivan (SLAC), J. Wenninger (CERN), F. Willeke (BNL), M. Wiseman (JLab), H.

Witte (BNL), W. Wittmer (JLab), F. Zimmermann (CERN)

EIC Collaboration Workshop, 8 October 2020

EICFCC-ee

97.75 km double ring, full-energy 𝑒± injection,injection every ~2 min. into same bucket

3.83 km double ring, full-energy 𝑒− injection, injection rate 1 Hz, every 2 min into same bucket

Vol 1 Physics, Vol 2 FCC-ee,

Vol 3 FCC-hh, Vol 4 HE-LHC

published in European Physical Journal C (Vol 1) and ST (Vol 2 – 4)

EPJ C 79, 6 (2019) 474 , EPJ ST 228, 2 (2019) 261-623 , EPJ ST 228, 4 (2019) 755-1107 , EPJ ST 228, 5 (2019) 1109-1382 [Open Access]

FCC Conceptual Design Report

https://link.springer.com/article/10.1140/epjc/s10052-019-6904-3https://link.springer.com/article/10.1140/epjst/e2019-900045-4https://link.springer.com/article/10.1140/epjst/e2019-900087-0https://link.springer.com/article/10.1140/epjst/e2019-900088-6

Most challenging FCC-ee parameters: initial Z pole running. Parameters of NSLS-II for comparison. EIC and FCC-ee

designs foresee an identical bunch population, at least an order of magnitude higher than in typical light sources or linear

colliders, comparable bunch spacing in the 10-20 ns range, similar short bunch lengths in the few mm range, average

beam currents in Ampere or few-Ampere range, beam energies of 10s of GeV, synchrotron radiation power per unit

length in the kW/m range, and critical photon energies of 10s of keV.

NSLS-II EIC FCC-ee-Z

Beam energy [GeV] 3 10 (18) 45.6 (80)

Bunch population [1011] 0.08 1.7 1.7

Bunch spacing [ns] 2 10 15, 17.5 or 20

Rms bunch length [mm] 4.5 - 9 10 3.5 from SR12 incl. BS

Beam current [A] 0.5 2.5 (0.27) 1.39

RF frequency [MHz] 500 591 or 394 400

SR power / beam /meter [W/m] 900 7000 600

Critical photon energy [keV] 2.4 9 (54) 19 (100)

NSLS-II, EIC & FCC-ee beam parameters

Beside SC RF systems, efficient RF power sources, high-power couplers,

HOMs & HOM damping, etc. (→E. Jensen), possible collaboration topics include:

beam instrumentation, esp. BPMs, beamstrahlung, beam loss, bunch

intensity,

impedance models, assessment of impedance-driven beam instabilities and their

mitigation, higher-order mode heating, and beam ion instability,

beam feedback systems,

interaction region (IR) design including masking and shielding of

synchrotron radiation from dipoles and quadrupoles,

development and perhaps prototyping of the SC final-focus quadrupole system,

and possibly other magnetic elements related to the interaction region,

synchrotron-radiation monitors and handling equipment associated withe IR,

self-polarization (or depolarization), strategies for spin-orbit matching, and

simulation tool adaptations or developments of new tools, polarimeter design,

arc vacuum system, possible NEG coating, photon absorbers, water cooling

and radiation shielding, low-impedance flanges, bellows, antechambers

Domain CERN/FCC BNL/EIC JLAB Other FCC Other EIC

impedance model,

instabilities, HOM,

ion instability

Mauro Migliorati

(INFN), Elena

Shaposhnikova

Mike

Blaskiewicz

Todd Satogata Alexander Novokhatski

(SLAC)

polarization Jorg Wenninger

(CERN), Alain

Blondel (UNIGE)

Vadim Ptitsyn Todd Satogata

Fanglei Lin

Eliana Gianfelice (FNAL)

beam

instrumentation, SR

monitors

Thibaut Levefre

(CERN)

David Gassner

Dany Padrazo

Todd Satogata Anke-Susanne Müller

(KIT)

beam feedback

systems

Wolfgang Hofle

(CERN)

Mike

Blaskiewicz

Todd Satogata

Robert Rimmer

John Fox (SU)

vacuum system Roberto Kersevan,

Cedric Garion (CERN)

Charles Hetzel Mark Wiseman

final focus

quadrupoles

Brett Parker,

Holger Witte

Walter Wittmer Mike Koratzinos (MIT),

Eugene Levichev (BINP)

SRF Erk Jensen, Frank

Gerigk (CERN)

Kevin Smith Robert Rimmer

MDI, IR shielding,

handling equipment

associated with the IR

Manuela Boscolo

(INFN), Helmut

Burkhardt (CERN)

Gary McIntire

Holger Witte

Walter Wittmer Mike Sullivan (SLAC)

Contact persons for collaboration domains (preliminary convener in bold)

Stefan Funkner et al., Phys. Rev. Accel. Beams 22, 022801 (2019)Benjamin Kehrer et al., Phys. Rev. Accel. Beams 21, 102803 (2018)

longitudinal bunch profiles recorded with the KALYPSO-based electro-optical

spectral decoding setup

setup to measure longitudinal charge density profiles of electron bunches at KARA

S. Funkner et al.,https://arxiv.org/abs/1912.01323

FCC-ee R&D: bunch-by-bunch diagnostics

high-throughput electro-optical

single-shot diagnostics

developed at KIT

https://arxiv.org/abs/1912.01323

EIC R&D: beamstrahlung monitor

schematic for EIC LABM

implementation at SuperKEKB

S. Di Carlo and G. Bonvicini NIM A 984 (2020) 164656

simulation of fast beam-ion instability

Bunch train evolution over 75 turns for CO2 (A = 44) gas in the arcs, with 7.5 ns bunch spacing: vertical centroid motion of the last bunch (left) and vertical emittance growth of most unstable bunch (right).

from FCC CDR vol. 2

→ sufficiently low pressure, bunch-by-bunch feedback, residual emittance growth?

Lotta Mether

PyECLOUD + PyHEADTAIL

10

FCC/EIC common elements

EIC collaboration workshop

8 October 2020

FCC boosted by ESPPU 2020a) An electron-positron Higgs factory is the highest-priority next collider. For the longer term, the European particle physics community has the ambition to operate a proton-proton collider at the highest achievable energy. Accomplishing these compelling goals will require innovation and cutting-edge technology …

Europe, together with its international partners, should investigate the technical and financial feasibility of a future hadron collider at CERN with a centre-of-mass energy of at least 100 TeV and with an electron-positron Higgs and electroweak factory as a possible first stage. Such a feasibility study of the colliders and related infrastructure should be established as a global endeavour and be completed on the timescale of the next Strategy update. “

→ FCC integrated programme prepares for both: e+e- Higgs and electroweak factory as

possible first stage and highest energy hadron collider as ultimate goal

ESU 2020, CERN-ESU-014: “It is important therefore to launch a feasibility study for such a collider to be completed in time for the next Strategy update, so that a decision as to whether this project can be implemented can be taken on that timescale. The feasibility study should involve the following aspects: the possibility of constructing such a large infrastructure in the vicinity of CERN, the financial plan to complete and operate a project of this scale with internationalpartners, its governance, and the handling of the energy consumption.”

11

FCC/EIC common elements

EIC collaboration workshop

8 October 2020

FCC Roadmap

2011 circular Higgs factory proposal

2013 ESPPU

2014 FCC study kickoff

2012 Higgs discovery announced

2018 FCC CDR

2025/26Feasibility proof

2020 ESPPU

2040 firstcollisions

2020 FCCIS kickoff

2026/7 ESPPU

2030start tunnelconstruction

2036 machineinstallation

today

2028 approval

2030 - 37 element production

2026 - 30 full technical design

12

FCC/EIC common elements

EIC collaboration workshop

8 October 2020

CE preparatory activities 2020 - 2030

• Schedule of major processes leading to start of construction begin 2030.

• For proof of principle feasibility: High risk site investigations 10 - 15 MCHF in 2022/23.

13

EIC reference schedule

EIC beam operation from 2030 onwards, ~10 years before FCC-ee commissioning J. Yeck

References:1. F. Willeke, Designs of Electron Ion Colliders, IPAC’20 (2020).

2. Electron-Ion Collider eRHIC Pre-Conceptual Design Report, BNL Report BNL-

211943-FORE, July 2019 – not publicly available.

3. M. Mangano et al., FCC Physics Opportunities - Future Circular Collider

Conceptual Design Report Volume 1, EPJ C 79, 6 (2019) 474 [Open Access]

4. M. Benedikt et al., FCC-ee: The Lepton Collider – Future Circular Collider

Conceptual Design Report Volume 2, EPJ ST 228, 2 (2019) 261-623 [Open

Access]

5. M. Benedikt et al., “Future Circular Colliders succeeding the LHC,” Nature

Physics, vol. 16, pp 402–407 (2020) [Open Access]

https://link.springer.com/article/10.1140/epjc/s10052-019-6904-3https://link.springer.com/article/10.1140/epjst/e2019-900045-4https://link.springer.com/article/10.1140/epjst/e2019-900045-4https://link.springer.com/article/10.1140/epjst/e2019-900045-4https://www.nature.com/articles/s41567-020-0856-2