Beam Windows f or high t ransverse densit y beams By t he CERN - - PowerPoint PPT Presentation
Beam Windows f or high t ransverse densit y beams By t he CERN Groupe Mthodes L. Bruno Present ed by Targets & Dumps Section AB/ ATB NBI 2003 7-11 November 2003 1 Present at ion by L.Bruno (CERN AB/ ATB) Beam Windows For
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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By t he CERN «Groupe Méthodes» Present ed by
AB/ ATB
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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q=1 bar
σc Titanium a = 30 mm (Beam Line) σc = 264 MPa yc = 1. 4 mm a = 50 mm (Target Unit ) σc = 339 MPa yc = 2. 7 mm Thickness t=0. 1mm
The structural problem implies large displace- ments (yc>t/ 2), which call f or iterative solutions.
= 0°
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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q=1 bar
σc Beryllium Ø 2. 5” (a=~32mm) (Beam Line) σc = 166 MPa yc = 0. 37 mm Ø 4” (a=~51mm) (Target Unit ) σc = 222 MPa yc = 0. 84 mm Thickness Ø 2. 5”: t=0. 020” (0.508mm) Ø 4” : t=0. 025” (0.635mm)
The structural problem implies large displace- ments (yc>t/ 2), which call f or iterative solutions.
= 0°
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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200 400 600 800
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r [mm] Temperature [° C]
Nominal intensity Ultimate intensity
Beam sigma = 0.53 mm Nominal int . = 2.4 1013 p Ult imat e int . = 3.5 1013 p
r [mm]
The temperature distribution induced by the CNGS beam was evaluated by FLUKA. Temperatures higher than 50°C are af f ected by statistical errors <1%. The simulation covered 3 107 events with a 0. 25mm x 0. 1mm axi- symmetric binning.
544°C 758°C
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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50 100 150 200 250
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Temperature [° C]
Nominal intensity Ultimate intensity
Beam sigma = 0.530 mm Nominal int . = 2.4 1013 p Ult imat e int . = 3.5 1013 p
r [mm]
The temperature distribution induced by the CNGS beam was evaluated by FLUKA. Temperatures higher than 50°C are af f ected by statistical errors <1%. The simulation covered 3 107 events with a 0. 4mm x 0. 1mm axi- symmetric binning.
150°C 205°C
SF=0.64 @ 200°C SF=0.73 @ 300°C a=~32mm SF=0.85 @ 200°C SF=0.97 @ 300°C a=~51mm
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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100 200 300 400
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r [mm] Temperature [° C]
Nominal intensity Ultimate intensity
Beam sigma = 0.795 mm Nominal int . = 2.4 1013 p Ult imat e int . = 3.5 1013 p
r [mm]
The temperature distribution induced f or a test case beam was evaluated by FLUKA. Temperatures higher than 50°C are af f ected by statistical errors <1%. The simulation covered 3 107 events with a 0. 4mm x 0. 1mm axi- symmetric binning.
266°C 372°C
SF=0.61 @ 300°C SF=0.69 @ 400°C a=30mm SF=0.78 @ 300°C SF=0.88 @ 400°C a=50mm
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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Titanium has a relatively low thermal dif f usivity of 2. 7 mm
2/ s (as a comparison, graphite
has 75 mm2/ s). This value implies a build- up of temperature at the second extraction. 0.01 0.1 1 10 100 1000 5 10 50 100 500
266°C
T [°C]
Beam sigma = 0.795 mm Nominal int . = 2.4 1013 p
199°C @ t=50ms
7-11 November 2003 NBI 2003 Present at ion by L.Bruno (CERN AB/ ATB)
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Brazed joint
Weld
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Vacuum system
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200 400 600 800 200 400 600 800
σy [MPa]
Cp [J kg-1K-1]
Ref ract ory Alloys
(Ti45.5Al2Nb2Cr ) (@704C-815C)
Ti- β Ti- α Ti- γ Ti 99%
(T111 - Ta8W2Hf ) (@540C-870C) (Nb10W2.5Zr @580C) (Ti6Al2Sn4Zr 2Mo) (Ti15Mo3Nb3Al.2Si)
Co Alloys
(Haines 188 @ 540C-870C) (I nconel 713LC) (@ 540C-870C)
Ni Alloys St . St eel
Captive reinf orced windows Captive windows
(L.Bruno, S.Sgobba)
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