Loading in 2 Seconds...
Loading in 2 Seconds...
Progress on coatings and grooves • M.Taborelli • Progress on C based coatings • Progress on SEY instrument • Progress on grooves
Progress on coatings Effect of the sputtering gas used during carbon film deposition: Ne and Kr Lowest yield up to now
Progress on coatings measured at CERN after 2h air after 14 d air Complete yield curve (measured at CSIC-Madrid) After 2 weeks air exposure dep. with Kr Dep. with Ne
Progress on coatings C(Kr), in SPS now Both coatings are quite Compact and well adhering C(Ne)
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 C1s XPS spectra • No difference in the content of O • difference in morphology, xtalline structure……? C(Kr) C1s XPS C(Ne)
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 (B4C has a rather high yield, already measured) - SiC, TiB2
Progress on SEY instrument First data from new system: unbaked copper
Progress on SEY instrument • Still to be optimized, verified…built: • - Control of focussing (at present some 2 mm spot, but not • well controlled above 1000eV) • 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
Progress on grooves Grooves made at CERN workshop with cutting tool (J.M.Geisser, S.Atieh) 2mm On copper: tool well aligned, small radii on top and bottom, but burrs along the grooves On stainless steel 304L: Preliminary trial without perfect alignment of the tool: large radius at the bottom
Progress on grooves Grooves in copper
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