HEP INDEPENDENT SAFETY REVIEW ARGONNE WAKEFIELD ACCELERATOR (AWA) - PowerPoint PPT Presentation

The Argonne Wakefield Accelerator (AWA) is a premier electron accelerator with the world’s highest bunch charge to carry out fundamental accelerator research with an emphasis on wakefield acceleration. HEP INDEPENDENT SAFETY REVIEW ARGONNE WAKEFIELD ACCELERATOR (AWA) OVERVIEW SCOTT DORAN Mechanical Design and Eng. AWA Operations and Support www.anl.gov/awa HEP Independent Safety Review September 24-25, 2018 Argonne, IL

AN INTRODUCTION TO AWA

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Introduction AWA ACCELERATING AWA ACCELERATING AWA MULTI LENS ARRAY AWA EXPERIMENTAL AREA CAVITIES STRUCTURE (MLA)  AWA uses both solid state (dielectric and  There are practical limits to building longer metallic) and plasma to perform electron an more expensive conventional beam driven acceleration. accelerators.  This technique generates acceleration from  AWA produces an accelerating gradient that bunches of electrons. is many times stronger than conventional accelerators at shorter distances.  The leading bunches create a powerful  AWA is unique. At places like APS users wave (wakefield) in the media, the trailing bunches ride this wave and gain energy. experiment with x-rays, at AWA the accelerator is the experiment. 3

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Building 366 Overview 4

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Controlled Access Rooms 5

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Bunker Overview 6

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Electron Beam Generation Schematic Electron Gun and Solenoids Accelerating Cavity Laser Mirrors In Vacuum 7

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Electron Beam Generation Schematic Electron RF Power In Gun and 1.3 GhZ Solenoids Accelerating RF Power In Cavity 1.3 GhZ Laser Mirrors In Vacuum 8

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Electron Beam Generation Schematic The AWA laser consists of a mode locked Ti:Saphire laser oscillator, three Class IV Ti:sapphire amplifiers, and pump lasers UV Laser In (Nd:YAG and Nd:YVO). In addition, an Excimer amplifier is used to amplify the Electron RF Power In laser energy to 15 mJ/pulse. Gun and 1.3 GhZ Solenoids Beam Splitter uses a Accelerating RF Power In series of 50/50 mirrors to Cavity 1.3 GhZ split the Laser Pulse to Generate a Laser Train Laser Mirrors In Cs2Te Coated Vacuum Magnesium Cathode 9

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Electron Beam Generation Schematic The AWA laser consists of a mode locked Ti:Saphire laser oscillator, three Class IV Ti:sapphire amplifiers, and pump lasers UV Laser In (Nd:YAG and Nd:YVO). In addition, an Excimer amplifier is used to amplify the Electron RF Power In laser energy to 15 mJ/pulse. Gun and 1.3 GhZ Solenoids Beam Splitter uses a Accelerating RF Power In series of 50/50 mirrors to Cavity 1.3 GhZ split the Laser Pulse to Generate a Laser Train Electron Bunches Electron Bunches are then injected Laser Electron Magnets into the various Mirrors In Bunches Gain Focus and Cs2Te Coated accelerating media Vacuum Energy by “Shoot” Magnesium Cathode Electron Traveling Thru Accelerating Bunches out 10 Cavities of Gun

AWA SAFETY CONTROL DOCUMENTATION 11

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA and Argonne’s Accelerator Safety Review Committee ASRC MEMBERSHIP ASRC RESPONSIBILITIES  Manoel Conde, AWA Group Leader, Some responsibilities include: is a member of the Argonne  Conduct triennial reviews of all accelerator Accelerator Safety Review facilities listed in LMS PROC-188, Accelerator Safety. Committee (ASRC)  Advise the Environment, Safety, and Quality  The committee reports to the Assurance Division (ESQ) director in the Deputy Laboratory Director for development of new or revised accelerator safety requirements. Operations through the Director,  Provide requested technical expertise in Environment, Safety and Quality interpretation of DOE accelerator safety Assurance. directives and evaluation of proposed  It’s purpose is to act in an advisory solutions for accelerator safety issues. capacity to support implementation of the Laboratory's accelerator  AWA documentation and safety program. procedures have been reviewed by ASRC. 12

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Control Documents In order to accomplish our experimental goals safely, AWA operates under several safety control documents.  Work Control Document (WCD)# 27979 Commissioning and Operation of the AWA Accelerators – Contains Several Documents Within • Safety Assessment Document (SAD) • Radiological Considerations • Bunker Access Control Procedure  Work Control Document (WCD)# 50518 – AWA Photocathode Deposition  Work Control Document (WCD)# 55954 – AWA/UCLA Plasma Source  Work Control Document (WCD)# 44654.0 – Personnel Task-based Hazard Analysis  Work Control Document (WCD)# 44654.1 (draft) – Personnel Task-based Hazard Analysis 13

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  7.5 foot thick concrete walls 3 foot  RF System thick concrete roof  Sulfur Hexafluoride  Two main electron beams  Deionized water  Experimental area  Bunker roof  High radiation area during operations  Shielded room  Radiation monitors inside and out  Regular access requires dosimetry  Interlocked doors and roof access 14

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  Houses all the remote capabilities to  RF System control and monitor the RF system,  Sulfur Hexafluoride electron beam parameters, magnets, power supplies, and the accelerator  Deionized water beamlines.  Bunker roof  Data acquisitions.  Shielded room  Access to Laser Room  Main keyed interlock system. 15

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  Class IV UV Laser  RF System  Controlled Access to prevent  Sulfur Hexafluoride accidental exposure  Deionized water  Second emergency door  Bunker roof  Must have ESH 120 Laser Safety  Shielded room Training  List of authorized users  Interlocked with warning lights 16

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  The RF Laboratory is the preparation and testing  RF System laboratory for various components prior to installation onto the AWA accelerator beamlines.  Sulfur Hexafluoride  Photocathode Lab consists of an ultra-high  Deionized water vacuum deposition chamber to grow high- quantum efficiency photocathodes for the Drive  Bunker roof RF Gun. WCD# 50518  Shielded room  The Vacuum Laboratory is the location where various vacuum parts are prepared and assembled before they are installed into the AWA accelerator beamlines.  All are controlled areas. 17

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  Four separate RF amplifier systems supplying  RF System RF power at 1.3 GhZ to photoinjector guns and accelerating cavities. Each RF amplifier system  Sulfur Hexafluoride consists of a 25 MW or a 30 MW klystron amplifier and modulator.  Deionized water  RF power is delivered to components by  Bunker roof pressurized waveguide.  Shielded room  Extensive surveys by Health Physics have been done ensuring that the shielding is adequate. No known radiation above background.  Doors, vacuum, klystron filament, and power supplies interlocked. 18

HEP INDEPENDENT SAFETY REVIEW AWA OVERVIEW AWA Safety Assessment Document (SAD) Safety Assessment Document (SAD) describes the contents and operations of the various AWA spaces and systems  Bunker and Accelerators  Control room  Laser room  Lab space  Evacuates and Pressurizes  RF System waveguide to ~14 psi of SF6 to  Sulfur Hexafluoride prevent arcing  Recovery of SF6 minimizes loss  Deionized water  Regular environmental reporting  Bunker roof  Monitored and interlocked with  Shielded room pressure switches and relief valves 19