use of NEG Pumps and Coatings in Large Vacuum Systems - CERN ...

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CAS May 17-23, 2006 The ESRF experience (R.Kersevan, M.Hahn, F.Demarcq, ESRF, 45th IUVSTA Workshop, Catania 2006) First NEG coated chamber installed in 2000 Reduced BS levels Faster vacuum conditioning Resistance to several venting/activation cycles No adverse effect on the machine: i.e. peeling-off of the coating, impedance budget, … F. Mazzolini – The use of NEG Pumps and Coatings in Large Vacuum Systems: Experience and limitations
“The machine division of the ESRF, in conjunction with Elettra and Soleil, has carried out throughout several years a rather detailed study of the effect of NEG-coated chambers, both made of SS and Al, as far as the resistive-wall impedance budget is concerned, especially on its effect on the single-bunch threshold Resistivity of the NEG-coating: the rather poor resistivity of Ti, Zr and V should enhance the imaginary part of the resistive wall impedance, affecting the single-bunch threshold: coating thicknesses have been reduced, from 1μm to 0.5μm (nominal), and the effect measured in good agreement with theory” ⇒ Reduction of the nominal thickness of the coatings, from 1 μm to 0.5 μm. ⇒ The vacuum performance has not been affected by the change, as predicted by measurements done at CERN (P.Chiggiato, 41st IUVSTA workshop, 2004).” CAS May 17-23, 2006 NEG coating: impedance budget (R.Kersevan, ESRF, 45th IUVSTA workshop, Catania 2006) F. Mazzolini – The use of NEG Pumps and Coatings in Large Vacuum Systems: Experience and limitations
Page 1 and 2: CAS May 17-23, 2006 The use of NEG
Page 3 and 4: Non Evaporable Getters (NEG) Pumps
Page 5 and 6: NEG Pumps: 33 Cartridge Ø202 CAS M
Page 7 and 8: NEG Pumps: Strips and Wafer NEG Str
Page 9 and 10: p/Q [mbar/mbar*l/s] 1,0E+00 1,0E-01
Page 11 and 12: Synchrotron light sources: vacuum c
Page 13 and 14: ID vacuum chambers @ Elettra I.D. M
Page 15 and 16: History of Insertion Device (ID) va
Page 17: NEG coated vacuum chambers in a “
Page 21 and 22: CAS May 17-23, 2006 Machine develop
Page 23 and 24: Trying to reinject an e-beam after
Page 25 and 26: CAS May 17-23, 2006 Start-up compar
Page 27 and 28: u.a. 100,0 10,0 1,0 0,1 CAS May 17-
Page 29 and 30: Transverse (vertical) impedance evo
Page 31 and 32: WhITE (Front-End 11.1 L) MEASUREMEN
Page 33 and 34: Third trial (activations #21-26) CA
Page 35 and 36: CAS May 17-23, 2006 The RHIC experi
Page 37 and 38: NEG COATINGS FOR PARTICLE ACCELERAT
Page 39 and 40: “2) In vacuum technology there ar
Page 41 and 42: C. Benvenuti, Non-evaporable getter

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