Update of the vacuum system of the European X-ray free electron laser XFEL
Sven Lederer (MVS) Lutz Lilje (MVS) Torsten Wohlenberg (MVS) DESY, HAMBURG OLAV III July 11-14, 2011 Oak Ridge, Tennessee How to edit the title slide Upper area: Title of your talk, max. 2 rows of the defined size (55 pt) Lower area (subtitle): Conference/meeting/workshop, location, date,your name and affiliation,max. 4 rows of the defined size (32 pt) Change the partner logos or add others in the last row. Outline Outline Introduction
Vacuum- & RF-requirements for the warm vacuum system Warm vacuum section & components Gun Injector Bunch compressors (BC1, BC2) Collimator Beam distribution Undulator chamber & Intersection Exit-window for the main dumps Summary and Outlook Before you start editing the slides of your talk change to the Master Slide view: Menu button View, Master, Slide Master: Edit the following 2 items in the 1st slide:1)1st row in the violet header: Delete the existent text and write the title of your talk into this text field2)The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field. If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Introduction European X-ray free electron laser (XFEL) is a light sourceof the 4th generation.Comparable with LCLS in California and SACLA in Japan Spring-8 OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Introduction Location of the European XFEL:
The 3.4-km-long X-ray laser will begin on the DESY site in Hamburg-Bahrenfeld and run mostly underground to the research site, south of the town of Schenefeld (Schleswig-Holstein). DOP, FHH, Landesbetrieb Geoinf. und Vermessung, LGV //DOP, (c) LVermA S-H 2007, S OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Introduction Research examples:
Deciphering the structure of biomolecules: Exploring the nanoworld in 3D: Filming chemical reactions: Observing small objects in strong fields: Investigating extreme states of matter: OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg XFEL- vacuum sections:
Introduction XFEL- vacuum sections: 5 m Undulator Warm vacuum system at room temperature Cold vacuum system superconducting linear accelerator inTESLA-technologie OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Vacuum and RF requirements for the warm vacuum system
Goal: Avoid effects that causes of significant beam losses or beam quality deterioration Pressure requirements beam loss from scattering on residual gas PCO=10-7m bar (Ptot=510-7 mbar), calculation 10 e- from each bunch negligible! Bremsstrahlung is small, mirrors! Emittance growth negligible as well Fast ion instability: ionized molecules interact with bunches alongtrain, initial small offset is exponentially amplified along bunchtrain;for XFEL bunch distance of 200 ns only ion masses beyond M100 can be captured no thread independent of pressure OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Vacuum and RF requirements for the warm vacuum system
Caused by the short elctron bunch length, wake fields are a critical issue to the performance of the machine.To minimize the deterioration of the beam quality for each vacuum section requirements on rms surface roughfness Oxide layer Relative permeability Maximal step at flange connections Maximal gap in longitudinal direction RF-shielding of bellows, valves and pump ports are specified in the High level specifications for aligment and surface properties of vacuum components OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Vacuum and RF requirements for the warm vacuum system
High Level Specifications for Alignment and Surface Properties of Vacuum Components, Available at EDMS D OLAV III July 11-14, 2011 Oak Ridge, Tennessee Update of the vacuum system of the European X-ray free electron laser Torsten WohlenbergMVS DESY, Hamburg Warm vacuum section & components
Gun & Injector : RF-gun copy of the prototype RF- gun4 1.5 cell L-band normal conducting Cu cavity. Tuning to the resonance frequency is done by controlling the cooling water temperature of 14 separated cooling channels Average pressure in the gun section p