Updates of Ver&cal Electro Polishing at Cornell
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1 Updates of Ver&cal Electro Polishing at Cornell Fumio Furuta, Georg H. HoffstaeBer Cornell University Laboratory for Elementary- Par&cle Physics Recent results of VEP ed cavi&es. Analysis on VEP removal. Temperature oscilla&on asymmetry.
2 What is Ver&cal Electropolish? Cavity Aluminum Electrode Al Electrod Does Not Rotate e 0.5 to 1 Hz PVDF Impeller H. Padamsee & A.C. Crawford, PAC07, WEPMS009 PVDF Electrode Cover It Rotates
3 Why Ver&cal Electropolish? Ver&cal Electropolishing has the Following Benefits: Eliminates rotary acid seals Eliminates sliding electrical contact Eliminates the cavity ver&cal/horizontal posi&on control fixtures Simplifies the acid plumbing/containment The outside of the cavity is ac&vely cooled, providing beber temperature control of the polishing reac&on. Lower capital equipment cost.
4 1.00E+11 Recent results of single cell + VEP Qo 1.00E+10 NR1-2, bulk- VEP+degas+micro- VEP+Bake, 1.8K NR1-3, bulk- VEP+degas+micro- VEP+Bake, 1.4K AES1-002, bulk- VEP+degas+micro- VEP w/ circula&on+bake, 1.8K 1.00E+09 AES1-006, bulk- VEP+degas+micro- VEP+Bake, 1.4K LR1-3(RE 60mm), CBP+bulk- VEP+degas+micro- VEP+Bake, 1.6K Hpk [mt] *NR, AES: TESLA shape *LR: re- entrant shape
5 Recent results of 9- cell + VEP 1.00E+11 Qo 1.00E+10 A10_VEP140um+degas+VEP30um+Bake, 2K AES5_VEP140um+degas+VEP30um+Bake, 2K A9_tumbling+VEP140um+degas+okypolish+bake, 2K A9_VEP30um+Bake, 2K 1.00E+09 Re- entrant(70mm)_tumbling+vep140um+degas+vep30um+bake, 2K Hpk [mt]
6 Achievements of VEP for ILC requirements 1.00E+11 Qo 1.00E+10 TESLA single TESLA 9cell RE single RE 9- cell RE 9- cell Plots show max. Eacc w/ Qo for each. TESLA single BCD target ACD target TESLA 9- cell RE single 1.00E Eacc [MV/m]
7 Analysis on VEP removal Preliminary single cell single cell* 9- cell 9- cell** Hpk [mt] >Single cells are NR1-3, AES1-002, AES1-006, Re- entrant(60mm). >9- cells are A9, A10, AES5, Re- entrant(70mm). >Cavity treatment: Bulk VEP (140~300um) + hydrogen degas + micro VEP + 110CBake. >Some cavi&es tumbled to remove defects. >*HNO 3 in electrolyte, 8ml/3.5L. >**EP aqer degas was replaced by 100nm oxypolish Micro VEP removal [um]
8 VEP system with Recircula&on VEP 2.1: Recircula&on TTC mee&ng 6 Dec. 11, Beijing Cornell SRF group
9 Temp. monitoring setup Resolu&on of thermocouples: 0.02 C Agita&on: 0.85Hz Acid Recircula&on(1Hz) Loca&on of thermocouples - > 60 second window Sample rate of TC: 1.5 Hz Current: 5 Hz Top half cup bobom half cup Thermometers
10 Temperature Oscilla&ons Asymmetry VEP of AES2-1 w/ acid circula&on Preliminary Top half Cup TC1 TC2 TC3 TC4 TC5 TC6 TC7 TC8 Current Time [secs] Current [A] Temperature[C] Current [A] TC1 TC3 TC5 TC7 Current Temp - mean(temp)[c] Time [secs] Bo7om half Cup TC1 TC2 TC3 TC4 TC5 TC6 TC7 TC8 Current Time [secs] TC2 TC4 TC6 TC8 Current 6030 Temp - mean(temp)[c] 40 0 Current [A] 19 Temperature[C] Current [A] TTC mee&ng 6 Dec. 11, Beijing Time [secs] Cornell SRF group
11 Interpreta&on Frequency of top 2 * frequency of bobom No obvious correla&on between temperature & electrolyte mo&on Upper cup T increase correlated for Type 1 & Type 2 current spike Lower Cup T increase correlated with Type 2 current spike T decrease correlated for Type 1 current spike Meter s&ck for VEP development Top and bobom oscilla&ons must be iden&cal Further analysis on temperature/current correla&on
12 Summary Recent results. >TESLA single cell achieved 39MV/m with Qo of 2.1e10 by VEP. >Feasibility of VEP + oxypolish was demonstrated with TESLA 9- cell. 36MV/m was achieved so far. >preliminary results show VEP removal dependence on gradient. >Temperature oscilla&on asymmetry was found during single cell VEP. We will check reproducibility of these processes. These may have hint to high gradient Q- slope issue of VEP. Ongoing R&Ds for VEP establishment. 1)Demonstra&on of high gradient w/ high Qo. step1. TESLA shape(okay) - > Re- entrant shape. step2. single cell - > 9- cell. 2) Demonstra&on of reproducibility and high yield. 3) Op&miza&on of parameters. voltage, current, temp, removal, agita&on, etc. 4) Understanding of VEP process. Temp. oscilla&on asymmetry, circula&on, etc.
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