LIU-ABT systems: SPS B.Balhan, J.Borburgh, H.Day 20 th November 2015.
LIU SPS Beam Scraping System Preliminary studies of new design and materials
description
Transcript of LIU SPS Beam Scraping System Preliminary studies of new design and materials
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LIU SPS Beam Scraping SystemPreliminary studies of new design and materials
(Materials studies based on TED/TCDI conditions)
LIU-SPS, Beam Loss, Protection, Transfer Lines Working Group Meeting
Maciariello Fausto Lorenzo 15/01/2013
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Scraper history
Maciariello Fausto Lorenzo (EN-STI-TCD)
• Two orientations, two axis scrapers in LSS 1 and LSS 5• Used during operations more intensively with LHC
beams• Fast mechanical movements with risk of failure• Limited lifetime of edge-welded bellows• Polluting the machine, additional shielding needed
(RP)
Device H count V countBSHV.51659 28042 28043BSHV.11759 665 630BSHV.11771 176036 173971
Cycles on 16/01/2012Device H count V countBSHV.51659 7663 7623BSHV.11759 219 193BSHV.11771 78332 77406
Cycles on 14/01/2013
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Results Boron Nitride
Transient Thermal
0.00
E+00
1.81
E-01
3.63
E-01
5.44
E-01
7.25
E-01
9.06
E-01
1.09
E+00
1.27
E+00
1.45
E+00
1.63
E+00
1.81
E+00
1.99
E+00
2.18
E+00
2.36
E+00
2.54
E+00
2.72
E+00
2.90
E+000
200
400
600
800
1000
1200
1400
1600
1800
2000
T [˚C ]
[m]
• Below the Melting point 2270 ˚C
• Max temperature reached with graphite R4550 was around 1300˚C
Maciariello Fausto Lorenzo (EN-STI-TCD)
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Results Boron Nitride (free)
Transient Structural
• Stassi’s criterion:
o Limit in compression 512 Mpa – Maximum compression stress 700Mpa
o Limit in traction 29 Mpa – Maximum traction stress 105 Mpa
Maciariello Fausto Lorenzo (EN-STI-TCD)
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The density is the key
Graph
ite
Boron
Nitr
ide
Boron
Nitr
ide
(hot
pre
ssed
)
Boron
Car
bide
Alum
iniu
m
Silico
n Car
bide
(HIP
)
Silico
n Nitr
ide
(HIP
)
Alum
inum
nitr
ide
Alum
ina
(85)
(H88
0)
Alum
ina
(97.
6)0.00E+00
5.00E+02
1.00E+03
1.50E+03
2.00E+03
2.50E+03
3.00E+03
3.50E+03
4.00E+03
• Even if the limit stress of BN is five times higher than graphite the increasing in density makes the stresses much higher
• No material was founded in our list of best materials.
ρ [Kg/m3]
Maciariello Fausto Lorenzo (EN-STI-TCD)
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Results Cfc 1.4
Transient Thermal
• Max service temperature for Cfc around 2000 ˚C (under vacuum).
• Below the Max service temperature.
Maciariello Fausto Lorenzo (EN-STI-TCD)
0.00
E+00
1.81
E-01
3.63
E-01
5.44
E-01
7.25
E-01
9.06
E-01
1.09
E+00
1.27
E+00
1.45
E+00
1.63
E+00
1.81
E+00
1.99
E+00
2.18
E+00
2.36
E+00
2.54
E+00
2.72
E+00
2.90
E+00
0
200
400
600
800
1000
1200
1400T [˚C ]
[m]
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Results Cfc 1.4
Transient Structural (Compression)
• Maximum /Minimum stress’ criterion needed:
• Limit in Compression (along z) 82.4 Mpa – Maximum compression stress 45 Mpa (Safety factor=1.82)
o Remind !!!• We are not taking into account the Dynamic stresses.
Maciariello Fausto Lorenzo (EN-STI-TCD)
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Results Cfc 1.7
Transient Thermal (Compression)
Maciariello Fausto Lorenzo (EN-STI-TCD)
• Max service temperature for Cfc around 2000 ˚C (under vacuum).
• Below the Max service temperature.
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Results Cfc 1.7
Transient Structural (Compression)
• Maximum /Minimum stress’ criterion needed:
o Limit in Compression 132 Mpa – Maximum traction stress 31 Mpa (safety factor =4.25)
Maciariello Fausto Lorenzo (EN-STI-TCD)
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ReminderTraction S.F.t Compression S.F.c
Max. value[MPa]
Limit[MPa]
Max value[MPa]
Limit[MPa]
Graphite R4550 26 38 1.46 143 125
Boron Nitrite 105 29 700 512
CFC 1.4 5 3084
6 45 82 1.45
CFC 1.7 4.8 12.848
2.6 31 132 4.25
• Best material in terms of ratio σlim/ σmax is CFC1.7• BN from CESselector, Cfc RNFF-SG 1.4 and 1.7 g/cm3 have been
used for TCDS Collimator (Sintec)• Dimanyc effects and scraping conditions still to take into account.
Maciariello Fausto Lorenzo (EN-STI-TCD)
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Design options – passive scraper
Maciariello Fausto Lorenzo (EN-STI-TCD)
• Low density materials, thermal extension small• Brazing techniques not adequate
Go for a clamped solution
• Collimator designo without cooling (TCDI type) or with cooling (TCS type)
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Design options
Maciariello Fausto Lorenzo (EN-STI-TCD)
• Depending on cooling needs a insert design is also an option
Courtesy K. Ilinov /M. Furtinger for Medaustron
13Maciariello Fausto Lorenzo (EN-STI-TCD)
Thank you for your attention
• Any questions ?