Progress on coatings and grooves M Taborelli Progress
Progress on coatings and grooves M. Taborelli -Progress on C based coatings -Progress on SEY instrument -Progress on grooves SPSU 15. 4. 2008
Progress on coatings Effect of the sputtering gas used during carbon film deposition: Ne and Kr Lowest yield up to now SPSU 15. 4. 2008
Progress on coatings Complete yield curve (measured at CSIC-Madrid) After 2 weeks air exposure dep. with Kr Dep. with Ne measured at CERN after 2 h air after 14 d air SPSU 15. 4. 2008
Progress on coatings C(Kr), in SPS now Both coatings are quite Compact and well adhering C(Ne) SPSU 15. 4. 2008
Progress on coatings The reason of the lower SEY is not understood yet -Implanted gas? some of the Kr deposited coating show Kr in the spectra (original reason for the Ne trial!) -No difference in the C 1 s XPS spectra -No difference in the content of O -difference in morphology, xtalline structure……? C(Kr) C 1 s XPS C(Ne) SPSU 15. 4. 2008
Plans for next coatings (…. find candidate for next liner) - reproduce a C(Ne) coating and its SEY - make rough surface (Cu or Zr) as substrate for low SEY (C) coating - BC with lower amount of B (B 4 C has a rather high yield, already measured) - Si. C, Ti. B 2 SPSU 15. 4. 2008
Progress on SEY instrument First data from new system: unbaked copper SPSU 15. 4. 2008
Progress on SEY instrument Still to be optimized, verified…built: - Control of focussing (at present some 2 mm spot, but not well controlled above 1000 e. V) -Position (distance) with respect to “optics” -Beam position stability at low Ep and magnetic field screening -Load lock and transfer to XPS still under construction -SPS transfer chamber under construction (J. Axensalva and J. Ramillon) Phase II: -Faster acquisition to avoid high dose. . . however it seems to be already OK -Implement flood gun for conditioning with e-beam SPSU 15. 4. 2008
Progress on grooves Grooves made at CERN workshop with cutting tool (J. M. Geisser, S. Atieh) 2 mm On copper: tool well aligned, small radii on top and bottom, but burrs along the grooves SPSU 15. 4. 2008 On stainless steel 304 L: Preliminary trial without perfect alignment of the tool: large radius at the bottom
Progress on grooves Grooves in copper SPSU 15. 4. 2008
Progress on grooves To continue the work: Cost of what has been done until now (short piece on steel and copper): 2000 CHF work + 2000 CHF tool = 4000 CHF To produce 800 mm x 100 mm (or 400 mm + 400 mm) on steel: 2000 CHF tools + 4000 CHF work =6000 CHF If we go on the entire amount will be charged: 10000 CHF SPSU 15. 4. 2008
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