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G. Olry, H-M Gassot, S. Rousselot (IPN Orsay) EuCARD-SRF annual review 2011, 4-5 May, IPN, Orsay Unité mixte de recherche CNRS-IN2P3 Université Paris-Sud 11 91406 Orsay cedex Tél. : +33 1 69 15 73 40 Fax : +33 1 69 15 64 70 http://ipnweb.in2p3.fr
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Since the last EuCARD-SRF Meeting in March 2010... Overall cavity design From march ’10 to July ’10: new cavity design under study based on Proposal for having the same end-groups for cavity β=1 (CEA) and cavity β=0.65 New parameter for vacuum load: 1.5 bar@300K From July ’10 to 15 th Oct ’10: Technical modifications to fit CERN’s short-cryomodule requirements 15 th Oct ’10: β=1 elliptical cavities will not be settle inside CERN’s short-cryomodule Call for tender and first order Cavity and helium vessel technical drawings Niobium Conclusion Manpower & planning
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April’10: Identical END-GROUPS between β=1 & β=0.65 cavities major changes on beta 0.65 cavity mechanical and RF designs: Bigger beam tube apertures New design of the 2 external half cells (field flatness) New location and interface of the power coupler (Qext) New helium vessel New tuning system interface April’10: Identical END-GROUPS between β=1 & β=0.65 cavities major changes on beta 0.65 cavity mechanical and RF designs: Bigger beam tube apertures New design of the 2 external half cells (field flatness) NNew location and interface of the power coupler (Qext) New helium vessel New tuning system interface Retuned Increased f (MHz)704.0 Epk/Eacc2.632.6 Bpk/Eacc (mT/MV/m)5.125.2 K (%)1.451.5% r/Q (Ohm)275290 G (Ohm)197 Vacc @ g & 1 Joule (MV) 1.11 Qo (@2K, Rres=2n ) 3.9 10 10 Transit Time Factor0.65 specs beta=0.65 cavity inside beta=1 helium vessel S. Rousselot (IPNO)
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Von Mises stresses for 1.5 bar @ 300K < 50 MPa with 4mm Lorentz forces detuning with 1 stiffening ring : K L ~ -1.6 Hz/(MV/m)² Cavity walls thickness = 4 mm 46 MPa H-M Gassot (IPNO) Optimized rings position: h=94 mm Beam axis h fixed free H-M Gassot (IPNO)
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July ’10 to 15 th Oct ’10: many iterations to fit the CERN’s short-cryomodule requirements Tuning system & holding bars integration: pb of angular position... Power coupler flange material: SS, Ti, Nb/Ti Overall Helium vessel design: connecting parts between cavity/tank, cryogenics pipes location and size... July ’10 to 15 th Oct ’10: many iterations to fit the CERN’s short-cryomodule requirements Tuning system & holding bars integration: pb of angular position... Power coupler flange material: SS, Ti, Nb/Ti Overall Helium vessel design: connecting parts between cavity/tank, cryogenics pipes location and size... Flange of the coupler port Ti flange for the tuning system
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15 th Oct ’10: CERN-CEA-CNRS major decision Beta=1 and Beta=0.65 cavities will be tested in CRYHOLAB only! No more constraints on interfaces and helium vessel design 15 th Oct ’10: CERN-CEA-CNRS major decision Beta=1 and Beta=0.65 cavities will be tested in CRYHOLAB only! No more constraints on interfaces and helium vessel design Thick tube in Nb Nb-to-Ti transition (EB weld) Thick tube in Nb Nb-to-Ti transition (EB weld) SS flange (brazed)
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S. Rousselot (IPNO) Final design Technical drawings: ready Technical specifications: ready Call for tender: currently under progress Technical drawings: ready Technical specifications: ready Call for tender: currently under progress
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Nb sheets: 4.2 mm (cells), 3.2 mm (end-groups), 2 mm (pick-up & HOM ports) 3 offers for RRR>250 Neyco: 69700 euros Plansee: 67500 euros Tokyodenkai: 62600 euros winner!... ”small” budget overrun of about 100%! Nb sheets: 520 €/kg! (270 € in 2006, 350 € in 2008) Thick tubes for cavity-to-helium vessel transition Coupler side: 1500 euros Tuning system side: 3300 euros Material received in February this year
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MANPOWER From April ’09 to end of March ’10: 15.24 p.m PLANNING --> end of June ’11: call for tender (public contract > 125k€ HT) July ’11: choice of the manufacturer Sept ’11: beginning of the fabrication June ’12: cavity delivery w/o helium vessel field flatness July ’12: helium vessel welding Sept ’12: cavity preparation (BCP + HPR) & assembly in clean room Oct ’12: test in vertical cryostat Before end of March ’13: cavity installation & test in CRYHOLAB MANPOWER From April ’09 to end of March ’10: 15.24 p.m PLANNING --> end of June ’11: call for tender (public contract > 125k€ HT) July ’11: choice of the manufacturer Sept ’11: beginning of the fabrication June ’12: cavity delivery w/o helium vessel field flatness July ’12: helium vessel welding Sept ’12: cavity preparation (BCP + HPR) & assembly in clean room Oct ’12: test in vertical cryostat Before end of March ’13: cavity installation & test in CRYHOLAB
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