7/11/2007 M.Taborelli, TS-MME M.Taborelli HDS-thick#2 tested in CTF3 polishing burrs, machining burrs, growing burrs

7/11/2007 M.Taborelli, TS-MME After CTF3 test, comparison with polishing burrs cleaned THIS IS NOT THE POLISHED FACE Polished face

7/11/2007 M.Taborelli, TS-MME After CTF3 run: comparison with non-polished face Here is the waveguide nominally this face was not polished Polished face

7/11/2007 M.Taborelli, TS-MME After CTF3 run: comparison with non-polished face

7/11/2007 M.Taborelli, TS-MME After heat treatmentBefore heat treatment Cleaned Heat treated

7/11/2007 M.Taborelli, TS-MME Proposed: mechanical burr removal under microscope Pass along the sharp corner with a fine file or abrasive paper (potentially it makes less sharp features than a scalpel) The risk is that we get something like this: Q1 Q2 Q1 Q2

7/11/2007 M.Taborelli, TS-MME Proposed chemical surface treatment for HDS11 (S.Calatroni) SUBU 2 (sulfamic acid 2 g/l, buthilic alcohol 5 ml/l, H2O2 50 ml/l, di-ammonium-hydrogen- citrate 1 72 ºC Etching speed 0.5 µm per minute Very well known for the surface preparation of Nb/Cu cavities Done for 11 GHz circular Procedure: Degreasing NGL SUBU 2 Rinsing Alcohol drying + N2 blowing Data from L. Ferreira and S. Forel