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LCLS II Beamline Separation

This document outlines key issues and considerations stemming from the installation of two parallel beamlines in the LCLS II tunnel. Topics discussed include personnel access, fire egress, equipment installation and maintenance challenges, and transport clearance for large objects. Solutions such as duck-under sections and removable beamline components are suggested to facilitate safe navigation and maintenance. The document also evaluates design alternatives, including three, two, and one-aisle configurations, to enhance safety and functionality within the tunnel environment.

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LCLS II Beamline Separation

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  1. LCLS II Beamline Separation • Issues and ideas resulting from two parallel beamlines in same tunnel

  2. Topology Tunnel Wall Exit Tunnel Wall HXR Beamline N Wall Aisle Center Aisle SXR Beamline S Wall Aisle Tunnel Wall Exit Tunnel Wall

  3. Issues • Installation and removal of equipment • Personnel access and passage • Fire egress, PPS search, unsafe spaces • Maintenance

  4. Installation • Transport clearance for largest objects in the presence of installed beamlines • X-ray and electron beamlines need clearance • Removable beamline sections may be needed to reach the Center Aisle.

  5. Personnel Access • Needed for inspections, maintenance, tours, PPS search, and to go between the Research Yard to EH2. • Duck-under sections may be needed to reach the Center Aisle • Tour groups may have to duck

  6. Fire Egress • Long tunnel is more hazardous than a normal building. Need safe retreat in either direction. • Fire codes imply stairs or ramps under beamlines,... • ... or instead, possibly, a duck-under plus an “equivalency”

  7. Maintenance • One or two-side access to beamline components • Room to pass by an area where maintenance is being performed.

  8. Design Alternatives • Three aisles: • Narrow center aisle, tight wall aisles • Two aisles: • No center aisle, narrow wall aisles • One aisle: • Vertical separation, large aisle

  9. Three aisle example - CESR

  10. Three Aisle 2.5 m beam separation “grade” Installation C Egress C Personnel B Maintenance C It would get B’s instead of C’s for Installation and Maintenance if 3.0 m separation instead of 2.5 m

  11. Two Aisle Example • LCLS-I Text

  12. Two Aisle Alternative “grade” Installation B Egress A Personnel B Maintenance B

  13. One Aisle Example

  14. One Aisle “grade” Installation B Egress A Personnel A Maintenance B

  15. Next Steps • Keep tunnel width • Explore vertical option some more • Check electron beam separation

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