Accelerator/ Medium Beta Cavities

Paolo MichelatoINFN Milano - LASA

www.europeanspallationsource.seApril 21, 2015

Medium Beta Cavities Overview

• ESS medium beta cavities requirements• INFN - LASA past experience on SC cavities• INFN - LASA man power• INFN prototyping on medium / high beta cavities• INFN major procurement: 36 medium beta cavities

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WP05 Master Schedule

Medium Beta Cavities Technical performances

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INFN Medium Beta Cavities Technical PerformancesRequirements Medium beta

Frequency (MHz) 704.42

Geometric beta 0.67

Nominal Accelerating Gradient (MV/m) 16.7

Epk (MV/m) < 50

Cell coupling k(%) ≥ 1.5

RF peak power (kW) 1100

Q ext 7.5 105

Q0 at nominal gradient > 5 109

Medium Beta Cavities Selected technologies

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INFN – LASA experience on SC cavities– SNS cavities– TRASCO cavities– PDS-XADS cavities– EUROTRANS / MAX Elliptical test cryomodule– TTF/Tesla & FLASH cavities and modules– European XFEL series production of 400 1.3 GHz

cavities– European XFEL 3.9 GHz system

Medium Beta Cavities Selected technologies /2

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Medium Beta Cavities Selected technologies /3

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Medium Beta Cavities Selected technologies /4

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Medium Beta Cavities Integration and Verification

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• Cavities will be fabricated using INFN design and will be plug compatible with CEA boundary conditions.

• INFN design is relative to the cavity itself.• Cavity interfaces, He tank geometry, flanges, tuner

connections, etc will be done on the basis of the French design.

Medium beta Cavities Organization at partner lab

The activity relative to the Medium Beta Cavities will be covered, according to our proposal, within the estimated man power of 15 FTE.

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Medium beta cavities Major Procurements /1

Medium beta and high beta cavities prototypes– Procurement contract NOT included in the proposal.

• Built prototypes of both medium and high beta cavities.– INFN design, using LG Nb, plug compatible with ESS cryomodule.

• Design process in progress.– Optimization to include LG option.

• LG Nb ingots procurement started.– Slicing process ordered.

• Full treatment (BCP, HPR, clean room) done in industry. • Final handling and test will be done at LASA in the qualified

infrastructure.

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Medium beta cavities Major Procurements /2

INFN Plug - compatible design just started (but well in progress)

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Medium beta cavities Major Procurements /3

INFN Plug - compatible design just started (but well in progress)

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Inner cell parameters

Medium Beta Cavities Major Procurements /4

Medium beta series cavities– Niobium procurement for the fabrication of 36 medium beta cavities.– Cavity fabrication of 36 (*) medium beta cavities in the industry,

including treatments, tuning, Helium tank integration, etc, accomplishing the ESS requirements in terms of performances, functional interfaces.

– Certification activities, documentation, ancillaries (flanges, vacuum valves, antennas, frames, etc.)

– Cold test in a qualified infrastructure.– Transportation in special boxes and delivery at the cryomodule

assembling facility.– Man power for the above activities.(*) INFN Design, plug compatible with CEA boundary condition

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Medium Beta Cavities Major Procurements /5

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Revised scheduling proposed

First 4 series cavities delivered by end 2017

Medium Beta Cavities Top risks

• Top risks– Availability of qualified companies at the time of the

contract placement– Modification of the boundary conditions for cavities

during the future development of activities

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Next Six Months

• Design of medium beta cavities plug compatible with CEA boundary conditions

• LG Nb ingot arrival at LASA• LG Nb ingot slicing (wire cutting)• Medium beta prototype ordering• Deep drawing of cells• Activities for the technological transfer of the cavity

processing (BCP) to the industry• Vertical test adaptation for 700 MHz cavities

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Medium Beta Cavities Summary

• INFN Milano – LASA activity on medium beta cavities started

• INFN design plug compatible with CEA boundary conditions

• First step: LG Medium beta and High beta cavities prototyping and testing

• Medium beta series production (36 cavities) start by end 2016

• First 4 series cavities delivered by end 2017

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