DR Layout Description
ILC DR Technical Baseline Review
Frascati, July 7, 2011
Mark Palmer
Cornell University
Introduction
• Dave has provided an overview of the overall
layout
• This talk will focus on key elements of the
present layout and the modifications from the
previous baseline
– Principally:
• Straights and Alcove/Cavern Layout
• Beam Line Spacing/Tunnel Diameter Issues
– CFS Discussions included:
• Rough Arc Estimate
• Preliminary discussion of utilities specifications
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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Straights Layout
• Layout Issues in Straights
– Minimize length consistent with 3.2km design
requirements
– Maintain injection/extraction layout
– Minimize phase adjustment trombone
– Scale the circumference chicane with the size
of the ring
– Space in RF & wiggler sections for all design
options (low & high power, 10Hz ops)
– Added space in wiggler section for photon
absorber
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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Interface with CFS
• June 2, 2011 Meeting
– Review shorter straights
• RF-Wiggler Layout
• Cavern/Alcove Requirements
– Beam Line Spacing
Presently set to 1.3m
– Set tunnel diameter
– Rough estimate of arcs
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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RF Longitudinal Picture
RF Cavity
Placement
Positron Ring #2
Positron Ring #1
Date
Event
Global Design Effort
5
Wiggler Cell
Date
Event
Global Design Effort
6
RF-Wiggler Straight
RF-Wiggler Straight Elements (712.3m - 2 rings)
4
ElectronEle
Element Values:
|1| a Quadrupole
|2| a Wiggler
|3| a RF Cavity
3
PositronEle
2
Element Type
1
0
-1
-2
-3
-4
-375
-250
-125
0
125
250
375
Loca on (m)
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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Tunnel Diameter Issues
Distributed
PS Racks?
42cm
dia
1.42 m
2.6 m
Assumptions:
1) Remove large foot floor supports
2) Assume waveguides are rerouted
3) Reduce scale to 90% (~half of
potential reduction with 500MHz
a 650MHz cavities
4) 1+2 a 0.85 × height, 3 gives
another factor of 0.9
5) NOTE: No cryostats are located
directly above each other when
longitudinal positions are
accounted for
5.5 m
dia
6.0 m
dia
~0.9 m
2.09 m
RF Alcove
2.09 m
June 2, 2011
CFS Meeting
Global Design Effort
8
Injection-Extraction Straight
DTC01 Injec on-Extrac on Straight
6
ElectronEle
PositronEle
4
Element Type
2
0
-2
Element Values:
|1| a Quadrupole
|2| a Extrac on Kicker
|3| a Injec on Kicker
|4| a Extrac on Septum
|5| a Injec on Septum
-4
-6
-400
-300
-200
-100
0
100
200
300
400
Loca on (m)
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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The Basic Racetrack
July 7, 2011
ILC DR Technical Baseline Review Frascati, July 7-8, 2011
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