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New SPS liners: the 2009 spring collection. M.Taborelli for the SPSU team. 24/3/2009. Liners in SPS: what and where XSD1 signal SEMCLOUD1 (1..48) StSt liner - PowerPoint PPT Presentation
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New SPS liners: the 2009 spring collection
M.Taborelli for the SPSU team
24/3/2009
Liners in SPS: what and where
XSD1 signal SEMCLOUD1 (1..48) StSt liner
XSD2 signal SEMCLOUD2 (49..96) a-C coating CNe13 liner (inserted 11/8 in SPS, vented 2weeks before insertion, measured already twice and vented from beginning December to now)
SDneg signal SEMCLOUD1 (49..96) a-C stripe of 4 cm width
EcEx signal SEMCLOUD2 (1..48) (cable of previous quad) a-C/Zr CNe/Zr#10
XSD1 XSD2 EcEx SDneg
Liner a-C/Zr
1 μm200 nm
C
Zr
CNe/Zr#10
-No major differences between the two ends of the liner (parameters were chosen for that).
-Unfortunately the roughness is less than in the previous trials made on small pieces in tubes instead of large liners. It is probably due to the higher temperature reached in the liner (more diffusivity=less roughness)
CNe/Zr#10 CNe9/Zr#3
CNe14
SEY max=0.96
Liner a-C/Zr: SEY
The differences reflect the observed roughness (and may be more than that….the CNe9 was in itself one of the best coatings we had)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
0 200 400 600 800 1000 1200 1400 1600 1800
energy
SE
Y
C/RoughZr#10 top
C/Zr#10 bottom
SEY_CNe9/Zr
CNe13
0.0
0.5
1.0
1.5
2.0
2.5
0 20 40 60 80 100 120 140
Distance (mm)
SE
Y
DeltaMax 1h air
DeltaMax_0
Previous experiment (2008) in C-magnet with StSt reference sample
40 mm
50 mm
Liner with a 40 mm wide stripe of a-C coating
0.5
0.6
0.7
0.8
0.9
1.0
1.1
0 200 400 600 800 1000 1200 1400 1600 1800
energy [eV]
SE
Y
CNe13
CNe32 top
Still to be inserted in C-magnet: SPS-SEY movable sample
a-C CNe14, aging 2 months in air wrapped in aluminium foil + 5 months in the “high vacuum” system (10-3 mbar) kept in static vacuum
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0 200 400 600 800 1000 1200 1400 1600 1800
SPS_2_20081001_1
SPS_2_20090217_1
2 months air, wrapped in alu foil
+5 months in HV
0.50.60.70.80.91.01.11.21.3
0 200 400 600 800 1000 1200 1400 1600 1800
energy
SEY
MBB_top_20090309_1
MB085_20090313
MBB #3 MB085
0.50.60.70.80.91.01.11.21.3
0 200 400 600 800 1000 1200 1400 1600 1800
energy
SEY
MBB_top_20090302_1
MBB_bottom_20090302_1
MB040_20090313_1
MBB #2 MB040 aged with