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