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000301888 1001_ $$0P:(DE-H253)PIP1003074$$aSinger, W.$$b0$$eCorresponding author$$udesy
000301888 1112_ $$aThe 7th European Particle Accelerator Conference EPAC 2000$$cVienna$$d2000-06-26 - 2000-06-30$$gEPAC 2000$$wAustria
000301888 245__ $$aHydro Forming of TESLA Cavities at DESY
000301888 260__ $$aHamburg$$bDESY$$c2000
000301888 300__ $$a327-329
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000301888 520__ $$aSince several years the development of seamless niobium cavity fabrication by hydro forming is being pursued at DESY. This technique offers the possibility of lower cost of fabrication and perhaps better rfperformance of the cavities because of the elimination of electron-beam welds, which in the standard fabrication technique have sometimes lead to inferior cavity performance due to defects. Several single cell 1300 MHz cavities have been formed from high purity seamless niobium tubes, which are under computer control expanded with internal pressure while simultaneously being swaged axially. The seamless tubes have been made by either back extrusion and flow forming or by spinning or deep drawing. Standard surface treatment techniques such as high temperature post purification, buffered chemical polishing(BCP), electropolishing (EP) and high pressure ultra pure water rinsing (HPR) have been applied to these cavities. The cavities exhibited high Q - values of 2 x 10$^10$ at 2K and residual resistances as low as 3 n$\Omega$ after the removal of a surface layer of app. 100 $\mu$m by BCP. Surprisingly, even at high gradients up to the maximum measured values of E$_{acc}$ $\approx$ 33 MV/m the Q-value did not decrease in the absence of field emission as often observed. After electropolishing of additional 100 $\mu$m one of the cavities reached an accelerating gradient of E$_{acc}$ $\geq$ 42 MV/m.
000301888 536__ $$0G:(DE-H253)POF1-HGF-No-Prog-20130405$$aNo facility / HGF program None (POF1-890)$$cPOF1-890$$x0
000301888 588__ $$aDataset connected to INSPIRE
000301888 650_7 $$2INSPIRE$$atalk: Vienna 2000/06/26
000301888 650_7 $$2INSPIRE$$aRF system: superconductivity
000301888 650_7 $$2INSPIRE$$aRF system: fabrication
000301888 650_7 $$2INSPIRE$$aniobium
000301888 650_7 $$2INSPIRE$$aRF system: surface
000301888 650_7 $$2INSPIRE$$aRF system: impedance
000301888 650_7 $$2INSPIRE$$aelectric field: upper limit
000301888 650_7 $$2INSPIRE$$aelectron positron: linear collider
000301888 650_7 $$2INSPIRE$$alinear collider: proposed
000301888 650_7 $$2INSPIRE$$aDESY TESLA Linac
000301888 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000301888 7001_ $$0P:(DE-HGF)0$$aKaiser, H.$$b1
000301888 7001_ $$0P:(DE-H253)PIP1001477$$aSinger, X.$$b2$$udesy
000301888 7001_ $$0P:(DE-HGF)0$$aGonin, I.$$b3
000301888 7001_ $$0P:(DE-HGF)0$$aZhelezov, I.$$b4
000301888 7001_ $$0P:(DE-HGF)0$$aKhabibullin, T.$$b5
000301888 7001_ $$0P:(DE-HGF)0$$aKneisel, P.$$b6
000301888 7001_ $$0P:(DE-HGF)0$$aSaito, K.$$b7
000301888 7870_ $$0PUBDB-2016-02907$$aDecking, Winfried$$dHamburg : DESY, 2000$$iIsPartOf$$rDESY-M-00-04; C00-06-26.2$$tContributions to the 7th European Particle Accelerator Conference EPAC 2000
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