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Tungsten plates on the market in 2010 ( Plansee – Cime Bocuze ). Pure W – W Composite Production Process Available Products Mechanical and Magnetic Properties Preliminary Ideas for a Prototype. CLIC physics/detector meeting 17 June 2009. W. Klempt CERN/PH. W – W Composite Material. - PowerPoint PPT Presentation
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Tungsten plates on the market in 2010
( Plansee – Cime Bocuze )
• Pure W – W Composite• Production Process• Available Products• Mechanical and Magnetic Properties• Preliminary Ideas for a Prototype
W. Klempt CERN/PH CLIC physics/detector meeting 17 June 2009
W – W Composite Material
• Pure W is difficult to use:– pretty brittle– Difficult to machine
• W composite materials:– Consist of W (≥ 90%) rest mixture of Fe, Ni, Cu … = 17 – 19 g/cm3
– Λ ≈ 10 cm, X0 ≈ 0.4 cm– Well established production procedure– Easy to machine– Price ~ 70 Euro/kg
Production Process of Tungsten Composite Materials
Product Range and Material Properties
Mechanical Properties
Magnetic properties of Densimet 180
Tungsten+Nickel :: Permeability vs B
0
10
20
30
40
50
60
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14
B [T]
Per
mea
bilit
y
tungsten
Magnetic properties of Densimet 180
Tungsten B vs H
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0 5000 10000 15000 20000 25000 30000
H (A/m)
B (T
esla
)
Desimet 180 mu = 1μ
Maximum size
• Maximum size is given by size of the oven
• Today a reasonable maximum size is about 1 ton of product.
• In case of 10 – mm - thick plates the maximum size is about 500 mm x 800 mm after cutting and machining.
• Rolling is complicate: hard phase (tungsten) mixed with ductile phase (CuNi). Brittleness increases!
A promising technique - extrusion
• Powder is mixed with a polyimide (nylon or similar).• The mixture is extruded.• First pre-sintering process (~800 oC).• Final sintering.• Option – rolling to straighten the plates – not to change thickness.
Size: from 0.5 to 5 mm thicknessnow 200 mm x 600 mm (could be longer).
Good mechanical properties but tried only with Densimet (NiFe).Next step: try it with Inermet (CuNi).
Very preliminary ideas on a possible prototype
Veto
Calorimeter
Beam
MC calculations correct for W ? (invisible energy, neutrons)
Depth ?Width ?Sampling rate, fraction?
Shower Geometry (W 10mm, gap 8mm)Calculations done by C. Grefe
r [m
m]
E [GeV]
Dep
th [m
m]
r
L
D
Leng
th [m
m]
E [GeV]
E [GeV]
Very preliminary ideas on a prototype
20
12
~5
~30
~480
ADP or SiPM
Scintillatortile
W plate
Start with a small size but build in an extendable wayProduction techniques for a later calorimeter should be used
Wavelengthshifter
Depthlayers
Width[mm]
No of channels
W weight [kg]
30 (3.4 Λ) 390 5070 1000
40 (4.6 Λ) 480 10240 2000
50 (5.7 Λ) 480 12800 2500
Conclusions
• Non brittle Tungsten (alloy, W≥90%) plates are available • Mechanical properties ok, magnetic properties to be
verified• Size today somehow small (< 0.3 m2), but can be
developed• Envisage construction of a small but extandable
prototype?