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BPM Workshop, Dec. 3rd, 2007

Draft Agenda for a Workshop on Mechanical, Vacuum and Cryogenic Issues around the Cold BPM of the XFEL Modules

Workshop on Mechanical, Vacuum and Cryogenic Issues around the Cold BPM of the XFEL Modules

 

Date: 5.12.07

 

Participants

 

  • H. Weise (PM-XFEL)
  • N. Rouviere (CEA)
  • C. Simon (CEA)
  • D. Nölle (MDI)
  • S. Vilcins (MDI)
  • K. Wittenburg (MDI)
  • M. Siemens (MDI)
  • R. Bandelmann (MKS)
  • H. Brück (MKS)
  • K. Jensch (MKS)
  • A. Mateisen (MKS)
  • B. van der Horst (MKS)
  • N. Mildner (MVS)
  • H. Remde (MVS)
  • K. Zapfe (MVS)

 

Workshop Goals

 

Results and Minutes

 

Program:

·        Session 1: Start at 9:00, Chair H. Weise

·        Mechanics and Fabrication

o       Production Process and open Questions: Reentrant BPM ( N. Rouviere)

§         Production Process (general)

§         Production Process (Welding Aspects)

§         Drawings of the Rentrant BPM

§         Drawings of the Reentrant BPM with 5 mm Welding

o       Production Process and open Questions: Button BPM ( S. Vilcins)

§         Presentation (pages 3-8)

o       Discussion and Change Requests -> Minutes

·        Vacuum and Cryogenics Aspects

o       Flanges for BPM Feedthroughs

§         Pros and Cons for CF vs. Cavity Flanges; MKS Experience (A. Matheisen)

§         Pros and Cons for CF vs. Cavity Flanges; MVS Experience (K. Zapfe)

o       Problems with the Cavity Flange Type and the Feedthrough Alignment (S. Vilcins)

§         Presentation (pages 23-24)

o       Discussion and Decision on the Flange Type for the cold Button BPM  -> Minutes

o       Some Information on Flange Tests at INFN Milano (P. Michelato et al)

 

o       Definition of a Test and Acceptance Procedure for the Feedthroughs

§         Presentation of Best Practice at DESY (D. Nölle for MKS/MHF-SL, 5 min)

§         Experience of a test perfomed by MDI (S. Vilcins, pages 9-18)

§         Discussion and Decision on a Specification for Qualification and Aceptance Test for the Series Production

·        Discussion  -> Minutes

·        Spec of a Feedthrough Test

 

·        Session 2: Start 13:30, Chair C. Simon

·        Particle Cleanlines

o       Assembly, mounting and Cleaning: Reentrant BPM ( C. Simon, N. Rouviere)

o       Assembly, mounting and Cleaning: Button BPM (S. Vilcins, pages 19-22)

o       Vacuum (Particle) Requirements and Quality Control for the cold BPM’sof the XFEL (K. Zapfe)

o       Comparison of particle cleaning methods for UHV components (H. Remde, 15 min)

o       Discussion and Definition of an Acceptance Test for cleaned BPMs -> Minutes

o       HOWTO: Transport of particle clean components ( A. Matheisen, 15 min)

·        Interfaces

o       Tolerances of the Interface between BPM and Magnet and Expectations on the Precision of the magnetic axis of the CIEMAT Magnet

(H. Brück 10)

o       Discussion of the question, if the pin holes can be drilled during magnet fabrication at the company  -> Minutes

·        Session 3, start 16:00, Chair D. Nölle

·        Discussion and Summary -> Minutes

 

 

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