Potential ILC Contributions From Cornell - ILC Agenda (Indico)

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Potential ILC contributions from CornellGeorg HoffstaetterOngoing and potentialCornellforCornell Laboratoryfor Acceleratorcontributionsto the BasedEIC Sciences andEducationCornell has experience in using CESR to study wiggler-dominated ILCdamping rings; has verified electron beam simulations against experimentsfrom source to high energy; and has developed and operated SRFcomponents.Design–SRF–Damping ringspolarizationGeorg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop–Positron1

The CBETACDRcontributions from CornellPotential1) Accelerator designa) Electron source optimizationb) Electron beam-transport optimization, including space charge, CSR, micro-bunching, polarization.c) Damping-ring design / simulation / optimization2) SRF topicsa) SRF material qualificationb) Vertical bare cryogenic cavity testsc) Horizontal dressed cavity testing in Cornell’s HTCd) SRF component testing, e.g. cold tuners, HOM absorbers, couplerse) HOM absorber material studiesf) SRF simulations, cavity design, RF component design3) Damping ring dynamicsa) Permanent magnet optics (from CBETA experience)b) Superconducting wigglers (from CESR experience)4) Positron productiona) Helical undulators (from optical stochastic cooling experience at CESR)Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop2

CBETA 1-st 4-turn SRF ERLPermanentMagnet tter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop3

Potential Cornell SRF ContributionsSRF simulations, cavity designCST Studio, ACE3P, Niobium material qualificationE.g., trapped flux studiesSRF cavity fabricationIncluding in-house EB weldingCavity preparationBCP, EP, CBP, furnace treatments,doping Vertical cryogenic cavity tests (200MHz–6GHz)Inside liquid helium bathWith LHe in cavity tank only (e.g., for tunertesting)Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop4

Potential Cornell SRF ContributionsSRF component design and testingE.g. cavity tuner, HOM absorbers, RF couplerHOM absorber material studiesHorizontal dressed cavity testing in Cornell’sHorizontal-Test-Cryomodule (HTC)1-cavity cryomodule, e.g. used for first LCLS-IIHE 9-cell cavity cryomodule testHorizontal test bed to study cavityperformance, RF coupler performance, cavityoperation, LLRF controls Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop5

Cornell SRF Group CapabilitiesRF designDesign and fabrication to fullcryomoduleMaterial characterizationIn-house cavity fabricationCavity surface preparationSRF cavity vertical testingComponent R&D / testingCryomodule design,assembly, and testingGeorg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop6

Cornellphotocathodeopportunity:Spin polarizedCathode production (incl. polarized)New activation methods that improve lifetime90% ESP @ 780 nmLifetime x12!!Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop7

Indications of micro-bunching / CSROccasionally, during operation a charge-dependent structure on the beam profilewas seen As early as the beginning of the second pass Charge dependent Single bunch effect Optics dependent Capability to investigate CSR, CSR shielding, and micro bunching.Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop8

The CBETACDRcontributions from CornellPotential1) Accelerator designa) Electron source optimizationb) Electron beam-transport optimization, including space charge, CSR, micro-bunching, polarization.c) Damping-ring design / simulation / optimization2) SRF topicsa) SRF material qualificationb) Vertical bare cryogenic cavity testsc) Horizontal dressed cavity testing in Cornell’s HTCd) SRF component testing, e.g. cold tuners, HOM absorbers, couplerse) HOM absorber material studiesf) SRF simulations, cavity design, RF component design3) Damping ring dynamicsa) Permanent magnet optics (from CBETA experience)b) Superconducting wigglers (from CESR experience)4) Positron productiona) Helical undulators (from optical stochastic cooling experience)Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop9

Questions ?Georg.Hoffstaetter@Cornell.edu - October 19, 2020 – American Linear Collider Workshop10

Georg.Hoffstaetter@Cornell.edu - October 19, 2020 -American Linear Collider Workshop 1 Ongoing and potential Cornell contributions to the EIC Potential ILC contributions from Cornell Georg Hoffstaetter for Cornell Laboratory for Accelerator Based Sciences and Education Cornell has experience in using CESR to study wiggler-dominated ILC

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