Transcript NLC Beam Delivery - Stanford University

NLC - The Next Linear Collider Project
NLC Beam Delivery
Lehman Review, May 1999
Vacuum System Cost Model
Presentation by Leif Eriksson
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Presentation Content
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Systems Presentations, WBS numbers
Base Line Specifications
Material Choices
Base Pressure Calculations and Pressure Profiles
Component Specification and Choices
Costing Procedure and System Costs
R&D
Summary
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
System Presentation
• NLC Beam Delivery is located
between e- and e+ Linac.
• NLC Beam Delivery is subdivided in:
– Collimation Area, WBS 115
– Interaction Region Transport
Line 1, IRT 1, WBS 116
– Interaction Region 1, IR 1,
WBS 117
– Interaction Region Transport
Line 2, WBS 118
– Interaction Region 2, IR 2,
WBS 119
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Baseline specs
• Must have:
– Base Pressure 5E-7 Torr in the
Collimation Area [ZDR]
– Base Pressure 5E-8 Torr in the
Big Bend Area [ZDR]
– Base Pressure 5E-9 Torr in the
Final Focus Area [ZDR]
– Low electrical resistance
– Small aperture, ~ 1/2” ID
– Uniform, smooth transition,
inner diameter
• Specials:
– Big Bend, absorb synchrotron
radiation, 31.4 W/m @ 500
GeV
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Materials
• Materials to chose from:
– Stainless steel, low outgassing, cheap
– Aluminum, low outgassing, cheap, good conductor, easy to extrude
– Copper, low outgassing, good heat absorber, good conductor, easy to
extrude
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Pressure calculations
Pressure Profile Calculation for NLC Beam Delivery
Parameters:
I.D of
1/2L between
beam line pumps
Outgassing
Total
Outgassing
Conductance
Pumping Distance Pressure at
Speed
from pmp. P x
ID (cm)
L (cm)
Q (Torr ltr/s/cm 2)
QTOT (Torr ltr/s)
C (Ltr/s)
S p (Ltr/s)
X (cm)
P x (Torr)
1.10
1.10
3.00
3.00
650
100
1800
550
1.0E-12
5.0E-11
1.0E-12
1.0E-11
3.46E-12
1.73E-10
9.42E-12
9.42E-11
0.02
0.16
0.18
0.59
30
30
30
30
650
100
50
550
4.54E-08
5.42E-08
3.13E-09
4.54E-08
L
Material
Copper/Stainless Steel
Aluminum
Copper/Stainless steel
Aluminum
2L
X
Inner Diameter
Px
SP
Approxim ate
Approxim ate
Approxim ate
Approxim ate
ID
L
Q
QTOT
outgas s ing
outgas s ing
outgas s ing
outgas s ing
rate
rate
rate
rate
SP
of Alum inum according to J. Weinberg: 5.0E-11 Torr ltr/s
of Alum inum according to AVS: 5.0E-13 Torr ltr/s
of Copper according to AVS: 1E-12 Torr ltr/s
of s tainles s s teel according to AVS: 1E-12 Torr ltr/s
Inner diam eter of beam line
Half the length between pum ps
Outgas s ing rate
Total outgas s ing from the inner s urface area over L
QTOT = (D x 3.14 x L x Q)/L
3
C
Sp
X
Conductance
Pum ping s peed at the entrance to the beam line
Point at where the pres s ure, P x, is calculated
C = 12.1(ID /L)
Px
Pres s ure at point X
Px = [(L/Sp) + (X/C) - (X2/2CL)]QTOT
[cm ]
[cm ]
[Torr ltr/second/cm 2]
[Torr ltr/second/cm ]
[l/s]
[l/s]
[cm ]
[Torr]
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery, Vacuum:
Pump Spacing & Pressure Profile
4.00E-08
3.00E-08
Pressure
2.00E-08
1.00E-08
0.00E+00
50
• With an outgassing rate of
5.00E-11 Torr ltrs/s/cm2, (Al),
the distance between pumps is
reduced to 2 meters
5.00E-08
65
0
55
0
45
0
35
0
25
0
15
0
– 13 meters
Pressure Profile Between Pumps
Torr
• Outgassing rate 1.00E-12 Torr
ltrs/s/cm2, (Cu, 304&316)
• ID= 1.1 cm
• Maximum distance between
pumps to maintain a maximum
pressure of 5.0E-08 Torr:
cm
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery, Vacuum:
Pump Spacing & Pressure Profile
4.00E-08
3.00E-08
Pressure
2.00E-08
1.00E-08
50
200
400
600
800
1000
1200
1400
0.00E+00
1600
• With an outgassing rate of
5.00E-11 Torr ltrs/s/cm2, (Al),
the distance between pumps is
reduced to 11 meters
5.00E-08
1800
– 32 meters
Pressure Profile Between Pumps
Torr
• Outgassing rate 1.00E-12 Torr
ltrs/s/cm2, (Cu, 304&316)
• ID= 3.00 cm
• Maximum distance between
pumps to maintain a maximum
pressure of 5.0E-08 Torr:
cm
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery, Vacuum:
Components - 1
• PUMPS
– The NLC Beam Delivery vacuum system is ion pumped.
– Pump size is 30 l/s.
• BEAM LINE
– All vacuum seals in areas in direct contact with the beam must be allmetal.
– Flange connections will be used only in component dense areas.
– Where the component density is low the beam line sections will be
welded/brazed together in situ.
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Components - 2
• GAUGES
– One gauge assembly measuring total pressure from atmospheric pressure
to 2E-10 Torr, every 250m. The gauges must be radiation hardened.
– Every beam line section must have a gauge combination, as described
above, on both sides of a beam line isolation valve.
• VALVES
– The beam line isolation valves are all-metal valves of VAT type, radiation
hardened.
– The valves are located 250 m apart.
– All metal right angle valves, 2 3/4“ CFF should be provided every 50m
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Components - 3
• TUNNEL ACCESS
– Access to the tunnel will be provided every 500m.
– A power supply/Control vault will be provided adjacent to the tunnel
access, on the ground level. No cable length from a beam line vacuum
device to the power supply/ controls vault should have to be longer than
300m.
• VACUUM CONTROL ROOM
– The NLC Beam Delivery System should have a centrally located vacuum
control room.
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Costing Procedure
AREA ENGINEERING
Conceptual Design Trp. Deck
Component Count
Excel Spread Sheets Beam Line Length
Component location
TECHNICAL SYSTEMS
ENGINEERING TEAM, TSET
Mechanical Sys.
Costing
Controls Sys.
AREA ENGINEERING
SUCCESS Cost Roll Up
Total Cost
ACCESS Data Base
Tunnel Layout
Access Points
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Cost, execution phase
• WBS 11525, Collimation
– Total, $24,616,028.00
– Material $20,361,028.00, 83%
– ED&I $4,255,000.00, 17%
• WBS 11725, IR 1
– Total, $20,618,000.00
– Material $15,516,000.00, 75%
– ED&I $5,102,000.00, 25%
• WBS 11625, IRT 1
– Total, $25,691,366.00
– Material, $20,911,366.00, 81%
– ED&I, $ 4,780,000.00, 19%
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
R&D
• Material research, copper vs. aluminum
– Investigate outgassing rates for both materials.
– Investigate thermal properties of various beam line material
profiles and how to absorb the heat load from the synchrotron
radiation in the Big Bends.
• Joining techniques for copper and aluminum
– Investigate orbital welding techniques for extruded beam line materials.
– Investigate other joining techniques for beam line materials.
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Cost break down
Material cost, pumps, leak detectors, misc.. hardware, $50,000
One FTE engineer, 1 yr.'s, 2000 hr’s x $55 = $110,000
TOTAL:
$160,000
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Summary
• We have a conceptual design for the NLC Beam Delivery
vacuum system.
• We understand the pressure requirements and the pressure
profile.
• We have an order-of-magnitude cost estimate for the
execution phase.
• We have identifies areas in the conceptual design that need
more R&D.
• We are ready to enter the next phase of engineering and
R&D for the NLC Beam Delivery Vacuum System
Author: Leif Eriksson
Date: MAY 1999
NLC - The Next Linear Collider Project
NLC Beam Delivery Vacuum:
Reference text
• All of the presented material is available for downloading from:
– http://www-sldnt.slac.stanford.edu/nlc/beamdeliveryhome.htm
• See under: Issues\Engineering
– A beam line schematic is also available at this location
Author: Leif Eriksson
Date: MAY 1999