LCLS Technical Design ReviewDecember 2003

1
LTU Electron Beam Dump Tim Montagne, LCLS
Linac December 12, 2003

• LCLS Coordinate System
• LTU Design Overview
• Electron Beam Dump Design Overview
• Design Risk

2
LCLS Coordinate System

• The coordinate system will be defined in LCLS
  Technical Note LCLS-TN-03-8.
• The coordinate system is defined relative to the
  Linac coordinate system.

3
CD1 DL2 Becomes LTU

• CD1 DL2 to LTU Design Comparison
• The DL2 design was changed to allow expansion of
  LCLS into multiple beamlines.
• CD1 DL2 Design
• The CD1 DL2 design allowed for 2 beamlines, North
  and South.
• The original DL2 length was 65.5m .
• LTU Design
• The present LTU design allows for 5 beamlines.
• The LTU length is 293.3 m.

4
LTU Future Expansion with New Undulator Lines
113
Future 4 º Soft X-ray Line
Future 2 º line
Undulator Start
research yard (FFTB)
2nd FEL Line North
1.5º
spont. und.
1st FEL Line South
4 m
Future -2 º line
5
LTU Design Overview

• LTU Design Layout
• The LTU beamline device layout is generated
  automatically using MAD deck coordinates.
• Beamline Devices
• Known device models are used for defined
  assemblies.
• Placeholder objects are used for undefined
  designs.

6
LTU Design Overview Magnet Support Concept

• LTU Magnet Support
• The quadrupole and X-Y corrector pair are mounted
  on a high stiffness modular support weldment.

7
LTU Design Overview Magnet Support Concept

• LTU Magnet Support
• The quadrupole and X-Y corrector pair are mounted
  on a high stiffness modular support weldment.

• Support Installation
• Each support pad will be installed and aligned
  prior to support installation.
• This arrangement was used in PEP-II and Spear 3.

8
LTU Vacuum System Design

• Vacuum System Design
• Optimized conductance.
• Drift tubes lt16 RMS finish.
• Drift tube material high electrical conductivity.
• Vacuum sector length optimized for short pumpdown
  time during service.

9
LTU Device Summary

• 37x .91Q17.72 quadrupole magnet
• 4x 4D102.36 dipole magnet
• 22x X corrector magnet
• 22x Y corrector magnet
• 2x Y bend magnet (transition BSY to LTU)
• 38x stripline type BPM
• 8x RF BPM
• 3x X collimator
• 3x Y collimator
• 2x Energy Collimator

• 3x Bunch length monitor
• 1x Single beam kicker magnet and dump
• 4x Wire scanner
• 3x Toroid
• 1x CSR Bunch Length Monitor
• 1x OTR Bunch Length Monitor
• 2x OTR Profile Monitor

10
Electron Beam Dump Design Overview

• Electron Beam Dump Design
• The dump layout is automatically positioned using
  MAD deck coordinates.
• Radiation Physics
• The beam dump design is in review by radiation
  physics.

Dipole Bend Magnet
Safety Bend Magnet
X-Ray Line
Electron Beam
Beam Dump
11
Electron Beam Dump Device Summary

• 1x 4D102.36 dipoles
• 2x Stripline type BPM
• 3x .91Q17.72 quadrupoles
• 2x X collimator
• 3x Y collimator
• 2x Y safety Y bend magnet
• 1x Profile monitor
• 4x Y bend magnet
• 1x Beam dump

12
Design Risk

• Low Risk Designs
• Quadrupole Magnets
• Dipole Magnets
• Corrector Magnets
• BPMs
• Toroids
• Collimators
• Tune up Dumps
• Alignment Stages
• Supporting Structures
• Vacuum System

• Medium Risk Designs
• Polished, High Electrical Conductivity Vacuum
  Chambers
• Wire Scanners
• OTR Profile Monitor
• High Risk Designs
• Electro-Optical Bunch Length monitor
• CSR Bunch Length Monitor
• OTR Bunch Length Monitor
• RF BPM