Progress on coatings and grooves C.Yin-Vallgren, S.Calatroni, P.Chiggiato, P.Costa Pinto,
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Transcript of Progress on coatings and grooves C.Yin-Vallgren, S.Calatroni, P.Chiggiato, P.Costa Pinto,
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SPSU05.08.2008
Progress on coatings and grooves
C.Yin-Vallgren, S.Calatroni, P.Chiggiato, P.Costa Pinto, M.Taborelli
-C based coatings: aging-Grooves
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SPSU05.08.2008
Evolution of CNe9 over 1 month
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CNe9_top_20080714_
2h3d8d15d23d
Aging of C
Slight shift of Emax to lower E, is compatible with higher SEY for surface sensitive, low energy electrons. Same as for contamination coverage of air exposed surfaces of metals
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SPSU05.08.2008
Aging for 2 nominally identical samples stored in the lab in air, in sample box
Measurements made repeatedly on the same sample: the air exposure occurs after the sample has received already a doseTypical dose per measurement: 10-7Clb/mm2
Aging of C
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C-Ne 8 bottom
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SPSU05.08.2008
Is there a difference between aging of irradiated and non-irradiated samples?
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C-Ne 8 bottom
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One sample measured only once after 1 monthOne sample measured only twice (2h and 1 month)To be studied more in detail
Aging of C
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SPSU05.08.2008
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CNe9_RoughZr_20080715_1
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Aging of C on rough Zr: 1 week air
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SPSU05.08.2008 1
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Particles counted before and after coating3m > D
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REF measure 1TUBE before coatingREF measure 2TUBE after coating
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Particles counted before and after coatingD
particles > 5m
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Measure 1Two identical SS tubesMeasured in clean room
TUBE + REF
TUBE coated with carbon
REF remains in the coating lab. (closed with
plastic covers)
Measure 2TUBE + REF
measured again in the clean room
MEASUREMENT OF PARTICLES IN A CARBON COATED TUBE
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SPSU05.08.2008
Grooves, calculation of L.Wang at SLAC on the geometryobtained on copper
Progress on grooves
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CERN workshop onCopper (S.Atieh, J.M.Geisser)
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0=1.50,Height=1.0mm, =15o
B=0.2TeslaB=2 Tesla
B=0
Assuming delta-max=1.51mm
15º
Reduction also for B=0so that we can measure in the lab
B=0.2TB=2T
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SPSU05.08.2008
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Grooved SurfaceFlat Surface
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tip=0.13mm,H=1mm
Measurement on Cu grooves (scan on the sample)
Progress on grooves
Expected decrease (perfect shape: 15° aperture, B=0) : factor 2Expected decrease (20° aperture + radii 0.13 mm, B=2T) : factor 1.3Measured decrease (real shape: 20 °+ radii 0.03 mm, B=0): factor 1.2The difference is possibly due to imperfection of the machined shape
B=2T, 20°, 0.13 mm radii)
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grooves
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SPSU05.08.2008
Progress on grooves
On Stainless steel:- By manufacturing with a shaped cutting tool the bottom of
the valley is rounded and the tips bend- The entire piece bends
grooves
-release material tensions by thermal treatment before machining- Trials in progress with a milling tool, but for the moment is shows to much wear
millingshape tool
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SPSU05.08.2008
Plans for SEY instrument
Done:- Retarding system up to -90V to measure low energy part of the SEY curve
Next:-Implement flood gun for conditioning with e-beam
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SPSU05.08.2008
Next on coatings:-New SPS liner, aged 15 days (CNe13, starting δmax =1)-More measurements of aging with single measurement on aged sample-layer of CNx
-characterization by Raman (collaboration with the Uni of Cambridge)
Next on grooves:-Improved shape from workshop-Measurements to be done on Al grooves received from M.Pivi
Other-SPS sample to be extracted and measured on 11/8, possibly new C sample inserted on the same day