Beamline Design Guide
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PUB-3114 ALS Beamline Design Guide INFORMATION FOR BEAMLINE DESIGNERS MARCH 1998 Revision 2 Advanced Light Source Ernest Orlando Lawrence Berkeley National Laboratory University of California Berkeley, CA 94720 DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or The Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof, or The Regents of the University of California. Ernest Orlando Lawrence Berkeley National Laboratory is an equal opportunity employer. Documentation referred to in this document and additional copies of this manual are available from the ALS User Office, 510-486-7745, Fax: 510-486-4773. The ALS values your suggestions. Please send any comments about this publication to Elizabeth Moxon at [email protected]. Contents iii Contents About This Manual v Introduction vii Beamline Definitions Beamline Component Groups 1 Responsibility for Beamline Components 3 Guidelines For Beamline Reviews General Information 5 Review Process 6 Conceptual Design Review General Information 7 Beamline Design Review General Information 9 Documentation Package 9 1. Beamline/Endstation Layout 10 2. Radiation Shielding 11 3. Hutches 12 4. Vacuum Components and Safety 13 5. Equipment-Protection System 14 6. Electrical Safety 16 7. Liquid-Cooled Components 17 8. Seismic Safety 18 9. Thin Vacuum Windows 19 10. Utility Requirements 19 11. Mechanical Safety 20 12. Typical Experiment 20 iv ALS Beamline Design Guide — Information for Beamline Designers Construction Begins General Information 23 Beamline Readiness Review General Information 25 Beamline Readiness Review Walkthrough General Information 27 Appendices 29 Appendix A: Criteria For Beamline Bremsstrahlung Shielding Appendix B: Advanced Light Source Vacuum Policy and Vacuum Guidelines for Beamlines and Experiment Endstations (LSBL-280) Appendix C: Survey and Alignment Information for ALS Users Appendix D: Information Sheets and Checklists for Beamline Review Committee Beamline Reviews (Procedure BL 08-16, Appendices I-VI) Appendix E: Contacts for Additional Information and Technical Questions Appendix F: Checklist and Timeline for Building a Beamline Appendix G: ALS User Advisories Appendix H: Radiation Hazards at the ALS Appendix I: Guidelines for Meeting Seismic Requirements for User Equipment at the ALS Appendix J: Design Criteria for O-Rings in High-Radiation Areas Appendix K: UV Light Hazards from Synchrotron Radiation Appendix L: Disassembly of Beamline Sections v About This Manual PURPOSE ABBREVIATIONS This manual (formerly known as ALS Beamline Design BDR Beamline Design Review Requirements) is written as a guide for those involved BRC Beamline Review Committee in the design and construction of beamlines and BRR Beamline Readiness Review endstations acceptable for use at the ALS. It contains guidelines and policies related to personnel safety and CDR Conceptual Design Review equipment and vacuum protection. All equipment and EH&S Environment, Health, and Safety procedures must ultimately satisfy the safety require- ments in the Berkeley Lab (LBNL) Health and Safety EPS Equipment Protection System Manual (PUB-3000) which is available on the internet LCW Low-Conductivity Water from the Berkeley Lab home page (www.lbl.gov). MOU Memorandum of Understanding PRT Participating Research Team PSS Personnel Safety Shutter RGA Residual Gas Analyzer RSS Radiation Safety System UHV Ultra-High Vacuum vi ALS Beamline Design Guide — Information for Beamline Designers vii Introduction ABOUT THE ADVANCED LIGHT RESEARCHERS AT THE ALS SOURCE A researcher at the ALS can work as a member of a The Advanced Light Source (ALS) is a national user participating research team (PRT) or as an indepen- facility for scientific research and development dent investigator. PRTs (collaborative groups of located at the Lawrence Berkeley National Labora- people from industry, universities, and/or government tory (LBNL) of the University of California. Its laboratories) are responsible for the design and purpose is to generate beams of very bright light in construction of one or a combination of the follow- the ultraviolet and soft x-ray regions of the spectrum. ing: insertion device, beamline, endstations (experi- Funded by the U.S. Department of Energy, the ALS is ment chambers). Independent investigators may bring open to researchers from industry, universities, and experiment endstations to the ALS from other government laboratories. locations, or may use endstations provided by the ALS facility or by a PRT. In either case, any team or independent investigator who brings a beamline or related equipment to the ALS must design the equipment such that it: • Conforms with all applicable safety regulations • Incorporates measures for the protection of the storage-ring vacuum and of costly beamline compo- nents. viii ALS Beamline Design Guide — Information for Beamline Designers Beamline Definitions 1 Beamline Definitions BEAMLINE COMPONENT GROUPS Even in the simplest configuration with no branching, the component group between the front end and the Definition of a Beamline endstation will be called a branchline in this manual. Beamlines are photon delivery systems that begin at the storage ring vacuum chamber and extend onto the experiment floor to include the experiment Front End endstations. This definition of a beamline includes The front end begins at the storage ring vacuum configurations with multiple branchlines and chamber and ends at the branchline interface, which is endstations. generally located immediately downstream (toward the experiment) from the personnel safety shutter(s) A beamline might have multiple branchlines to at the shield wall. (In some cases the branchline accommodate different optical instrumentation. Each interface may occur further downstream or further branchline might have multiple endstations to opti- upstream.) mize timesharing of the beam. The simplest beamline configuration would have no branching and a single Each beamline has one front end shared by all endstation. branchlines. The major components of a front end are: Beamline Configuration COMPONENT FUNCTION The figure below represents a generalized combina- tion of configurations. Water-cooled Pass the entire or a partial apertures width of the beam to downstream components Endstation interface while protecting equipment from thermal damage. Branchlines Front-end Branchline Veacuum valves Permit isolation of th interface interface Endstations beamline vacuum environment Front-end from that of the storage ring. Storage ring Water-cooled Closes to interrupt Shield wall photon shutter transmission of the synchrotron-radiation beam. Personnel Closes to provide safety bremsstrahlung radiation The three major beamline component groups are: shutter shielding for the beamline. • Front end Note: For bend-magnet beamlines, space in the front end will be reserved for a possible mirror chamber. • Branchlines • Endstations 2 ALS Beamline Design Guide — Information for Beamline Designers Branchlines Endstations The branchline component group begins at the The endstation component group begins at the branchline interface and ends at the endstation endstation interface. It may consist of one or more interface, which is immediately upstream from the experiment stations. The components will vary first endstation component. depending on the type of experiments being con- ducted. Although the branchline section begins at the branchline interface, it need not begin branching at Certain endstations, for example those on white-light that point. On some beamlines with multiple beamlines, must be surrounded by a hutch to protect branchlines, a region beginning at this interface and personnel from radiation. extending downstream for a distance may contain instrumentation that is shared by all the branchlines. For example, a single mirror tank or aperture tank may be used to service all the branchlines. The following component types are found in branchlines: COMPONENT FUNCTION Personnel safety Closes to provide shutter bremsstrahlung radiation shielding for the branchline. Oeptics Focus and filter th synchrotron-radiation beam. Focusing mirrors and monochromators are examples. Vracuum valves Isolate components fo installation, servicing, and equipment protection. Isolate the branchline vacuum from the attached endstation(s). Dliagnostics Align and qualify optica components. Provide data on the properties of the beam. Beamline Definitions 3 RESPONSIBILITY FOR BEAMLINE COMPONENTS Policy The responsibility for the design, construction, and installation of the major beamline components will be specifically defined in a memorandum of understand- ing (MOU)