progress on coatings and grooves m.taborelli progress on c based coatings
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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SPSU 15.4.2008
Progress on coatings and grooves
M.Taborelli
-Progress on C based coatings-Progress on SEY instrument-Progress on grooves
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SPSU 15.4.2008
Effect of the sputtering gas used during carbon film deposition: Ne and Kr
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
C run 3, 2hair, 2092-a
bottom,
C run 4, bottom 2h
air
C Ne,bottom, 2hair, 2097-b
rela
tive
yie
ld
500Vdeposited w ith Kr w ith Kr,in SPS linernow
deposited w ith w ith Ne
Progress on coatings
Lowest yield up to now
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SPSU 15.4.2008
Complete yield curve (measured at CSIC-Madrid)
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
0 100 200 300 400 500 600 700 800 900
Primary Energy (eV)
SE
Y
After 2 weeks air exposure
dep. with Kr
Dep. with Ne
Progress on coatings
measured at CERN after 2h air after 14 d air
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SPSU 15.4.2008
Progress on coatings
Both coatings are quiteCompact and well adhering
C(Kr), in SPS now
C(Ne)
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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 C1s XPS spectra-No difference in the content of O-difference in morphology, xtalline structure……?
0
10000
20000
30000
40000
50000
60000
278280282284286288290292294
binding energy [eV]
Inte
nsi
ty (a
rb. u
n.)
2094-a r4
2097-a
2097-b
C(Ne)
C(Kr)
C1s XPS
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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 (B4C has a rather high yield, already measured)
- SiC, TiB2
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SPSU 15.4.2008
0.50
0.70
0.90
1.10
1.30
1.50
1.70
1.90
2.10
2.30
0 200 400 600 800 1000 1200 1400 1600 1800 2000
primary electron energy in eV
seco
ndar
y el
ectr
on Y
iled
Cu first
Cu second
Cu fine scan
Cu last
Progress on SEY instrument
First data from new system: unbaked copper
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SPSU 15.4.2008
Progress on SEY instrument
Still to be optimized, verified…built:
- Control of focussing (at present some 2 mm spot, but notwell 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
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SPSU 15.4.2008
Grooves made at CERN workshop with cutting tool(J.M.Geisser, S.Atieh)
Progress on grooves
On copper: tool well aligned, small radii on top and bottom, but burrsalong the grooves
On stainless steel 304L:Preliminary trial without perfect alignment of the tool: large radius at the bottom
2mm
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SPSU 15.4.2008
Progress on grooves
Grooves in copper
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SPSU 15.4.2008
To continue the work:
Progress on grooves
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