Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for...
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![Page 1: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/1.jpg)
Industrialization of Electropolishing (EP)D.Proch, DESY
• EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical Polishing, BCP)
• There are experimental type EP installations in several laboratories
• Worldwide there was only one industrial EP facility at Japan (Nomura plating)
• EP activities in CARE:– Optimize EP parameters (DESY, Saclay, INFN
Legnaro)– Transfer EP technology to industry– Develop quality assurance methods (QA) for EP
![Page 2: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/2.jpg)
Electro-chemistry of EP• Oxidation
2 Nb + 5 SO4-- + 5 H2O Nb2 O5 + 10 H+ + 5 SO4-- + 10 e-
• ReductionNb2 O5 + 6 HF H2 NbOF5 + Nb O2 F 0.5 H2 O +
1.5 H2 O
Nb O2 F 0.5 H2 O + 4 HF H2 Nb O F5 + 1.5 H2 O
• Important:– HF is a very toxic acid!!!– Hydrogen gas is produced
![Page 3: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/3.jpg)
Principle arrangement of EP
![Page 4: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/4.jpg)
New EP electrode at DESY EP
Al cathodeAcid injection holeon top of the cavity equator
Teflon insulator covering the electrode in the beam tube area
PE spacer holding the TEFLON Nitrogen overlay tube
PTFE net covering the electrodes
![Page 5: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/5.jpg)
Details of the EP mechanical frame
Timing belt disc
Disks for sliding current transmitter
Current leads
![Page 6: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/6.jpg)
Cathode feed trough at the beam pipe flange
current leads
alumina electrode
Nitrogen overlay inlet pipe
disc for sliding current transmitter
Gas outlet towards exhaust cleaner ( nitrogen, hydrogen and evaporated HF)
![Page 7: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/7.jpg)
EP installation at DESY
![Page 8: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/8.jpg)
EP Installation at Henkel,1
![Page 9: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/9.jpg)
EP installation at Henkel,2
![Page 10: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/10.jpg)
EP installation at ACCEL
![Page 11: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/11.jpg)
Best candidates for EP electrolyte quality assurance (Henkel Study)
• Titration• ICP-OES (inductively coupled plasma-
optical emission spectroscopy)• IC (ionic-chromatography)• TOC (total organic carbon)• NMR (nuclear magnetic resonance)• FTIR-ATR-probe (Fourier transformation
infrared spectroscopy –attenuated total reflection)
![Page 12: Industrialization of Electropolishing (EP) D.Proch, DESY EP is the preferred cleaning method for superconducting Nb resonators (besides Buffered Chemical.](https://reader030.fdocuments.us/reader030/viewer/2022032709/56649ecb5503460f94bd9d50/html5/thumbnails/12.jpg)
Method Applicability
Titration total acidity
ICP-OES all elements (Nb, Fe,..)
IC + distillation Ions (So4, F-, FSO3H
TOC organic impurities
NMR organic impurities
FTIR-ATR-probetotal overview of components defined by the ATR data base
Overview QA methods for EP electrolyte (Henkel study)
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Summary EP industrialization,1
• The goal of this task was to explore and optimize the important operating parameters of the DESY EP system and to transfer this technology to industry.
• At DESY 176 EP treatments of 9-cell cavities have been carried out
• The EP technology has been successfully transferred to industry.
• Two companies (ACCEL and Henkel) have designed, built, installed and operated EP installations based on the experience with electropolishing at DESY.
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Summary EP industrialization,2
• Up to now ACCEL and Henkel have treated 24 cavities in total
• In addition a QA strategy for the EP electrolyte has been worked out by Henkel company
• Electropolishing infrastructure & expertise at two companies is available now in Europe for EP cleaning of TTF type multi-cell Nb resonators
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Hazard of HFRepair of a leak in the heat exchanger