Summary cavity design & manufacturing

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Ofelia Capatina (CERN)

• Beta = 0.65• RF design done by IPNO• Mechanical design done by IPNO• Titanium helium tank• 1 niobium cavity to be manufactured by IPN Orsay• To be tested in the “CRYHOLAB” at CEA Saclay• CEA tuner • CEA main coupler

SPL equipped cavities

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Configuration to be tested in CRYHOLAB

• Beta = 1, CEA cavity• RF design done by CEA (will be compared later in this talk to ESS design)• Mechanical design done by CEA• Titanium helium tank• 1 niobium cavity to be manufactured by CEA• To be tested in the “CRYHOLAB” at CEA Saclay• CEA tuner • CEA main coupler

SPL equipped cavities

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Configuration to be tested in CRYHOLAB

• Beta = 1, BNL cavity• RF and mechanical design done by BNL• Titanium helium tank• 1 copper cavity has been delivered to BNL and the HOM studies has

begun• 1 niobium cavity fabrication has started; Cavity fabrication and perform

vertical testing in 2012• The design of the single-cavity cryomodule has begun with the goal to

have the cryomodule complete by summer of 2013• It will be used for Coherent electron Cooling Proof-of-Principle (CeC PoP)

experiment in RHIC starting with Run-14• Antenna-type HOM couplers are being developed• Computer simulations with CST MWS and Omega3P are in progress; The

simulation results will be compared with measurements of the BNL3 copper model

SPL equipped cavities

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• Beta = 1, BNL cavities

SPL equipped cavities

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• Beta = 1, BNL cavities

SPL equipped cavities

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• Beta = 1, BNL cavities

SPL equipped cavities

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• Beta = 1, BNL cavities

SPL equipped cavities

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• Beta = 1, CERN cavities• RF design done by CEA• Mechanical design done by CEA and CERN• Stainless steel helium tank• 2 copper cavity manufacturing ongoing at CERN• 5 niobium cavities to be manufactured by end 2012

• 4 in industry (Research Instruments)• 1 at CERN

• To be tested in the short cryo-module at CERN• CEA tuner • CERN main coupler

(talk of Eric Montesions tomorrow)

SPL equipped cavities

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Configuration to be tested in cryo-module

• Beta = 1, CERN cavities

SPL equipped cavities

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• Beta = 1, CERN cavities

SPL equipped cavities

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•Ok in general; •Microstructure specification hard to achieve; •Small deviation from tube final dimension specification

• Beta = 1, CERN cavities

SPL equipped cavities

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• Beta = 1, CERN cavities

SPL equipped cavities

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• Beta = 1, CERN cavities – Manufacturing qualification

SPL equipped cavities

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• Beta = 1, CERN cavities• Ti on Nb welding qualifications

SPL equipped cavities

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• Beta = 1, CERN cavities• SS on Nb brazing qualification (technique extensively and

successfully used for LEP cavities)

SPL equipped cavities

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• Beta = 1, CERN cavities• SS on Nb welding R&D

SPL equipped cavities

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• Beta = 1, CERN cavities• Copper on Nb R&D

SPL equipped cavities

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• Beta = 1, CERN cavities• Copper cavities manufacturing ongoing

SPL equipped cavities

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• Beta = 1, CERN cavities• Copper cavities manufacturing ongoing

SPL equipped cavities

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• Beta = 1, CERN cavities• EP station

SPL equipped cavities

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Bpk/Eacc [mT/(MV/m)] 4.20Epk/Eacc 1.99G [Ohm] 270Cell to cell coupling 1.92 %r/Q [Ohms] 566Lacc = Ngap.b.l/2 [m] 1.0647

RF frequency 704.42 MHzCavity geometrical beta 1Accelerating gradient 25 MV/m

Maximum surface E field 40 MV/mAverage pulse current 40 mAPeak RF power 1 MWRepetition frequency 50 HzDuty cycle 5%Operating Temperature 2 K

RF frequency 704.42 MHzCavity geometrical beta 0.86Accelerating gradient 18 MV/mQ0 at nominal field > 6 109

Maximum surface E field 40 MV/mAverage pulse current 50 mAPeak RF power 900 kWRepetition frequency 14 HzBeam pulse length 2.86 msOperating Temperature 2 K

Bpk/Eacc [mT/(MV/m)] 4.3Epk/Eacc 2.2G [Ohm] 241Cell to cell coupling 1.8 %r/Q [Ohms] 477Lacc = Ngap. .b l/2 [m] 0.915Cell wall angle > 8°

Ø96mm

Ø96mmLtot=1393mm

Ø140mm

Ø140mm

Ltot=1315mm

DES

IGN

PAR

AMET

ERS

DES

IGN

PAR

AMET

ERS

RF P

ARAM

ETER

S

RF P

ARAM

ETER

S

Cavity RF design : SPL vs ESS

SPL ESS

Juliette Plouin CEA-SaclayOC, 09/December/2011

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Mechanicals design Saclay prototype : possible integration in Cryholab

• Helium tank in Titanium (limits the differential shrinkage with Nb during cooling down)

• All flanges made of Nb or Nb/Ti• except the FPC flange, in stainless steel with

copper gasket, to be compatible with the HIPPI coupler, and for safety reasons

intermediate piece in Ti needed

Helium tank in Ti

Intermediate piece in Ti

Bellows (Ti)

Stainless Steel flange+copper gasket

Intermediate piece in Ti

Helium tank in Ti

The position of the HOM ports could change after the prototypes, in relation with HOM couplers studies (SPL and ESS)

Helium tank in Ti

Nb/Ti flanges

Helium tank in Ti

Bellows (Ti)

Intermediate piece in Ti

• Helium tank in Titanium (limits the differential shrinkage with Nb during cooling down)

• All flanges made of Nb or Nb/Ti

Juliette Plouin CEA-SaclayOC, 09/December/2011

• Remark:• Any cavity / helium tank design choice has direct impact

on cryomodule configuration and design• ESS cavity, helium tank and coupler design baseline

different from choices done for CERN cryo-module

Design : SPL vs ESS

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