1 / 16

Layout of the Synchronisation System for the VUV-FEL

Layout of the Synchronisation System for the VUV-FEL. Dipl. Ing. Henning Christof Weddig DESY Hamburg. RF System Requirements. System Length 200 m (VUV_FEL); 3 km (XFEL) RF Phase Noise (within macropulse – 1 ms) 0.05 o RMS (at 1.3 GHz)  ~0.1 ps RF Phase Noise (during 100 ms time)

ranae
Download Presentation

Layout of the Synchronisation System for the VUV-FEL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Layout of the Synchronisation System for the VUV-FEL Dipl. Ing. Henning Christof Weddig DESY Hamburg DESY MHF-p

  2. RF System Requirements System Length 200 m (VUV_FEL); 3 km (XFEL) RF Phase Noise (within macropulse – 1 ms) 0.05o RMS (at 1.3 GHz)  ~0.1 ps RF Phase Noise (during 100 ms time) 0.15o RMS (at 1.3 GHz)  ~0.3 ps RF Phase Stability (short term <1 minute) <0.5o (at 1.3 GHz)  ~1 ps RF Phase Stability (long term) <5o (at 1.3 GHz)  ~10 ps RF frequency range 1 MHz – 2.8 GHz DESY MHF-p

  3. System components • Ultra high stable master oscillator • RF distribution system (length at VUV-FEL about. 200 m) • Temperature stabilized coaxial cables • Local 1.3 GHz/2.856 GHz frequency generation • Fiber optic and coaxial system to monitor and correct long term phase drifts DESY MHF-p

  4. Frequencies to be distributed • the exact frequencies are multiples or divisions of the 9.027775 MHz reference frequency • 1 MHz (timing of complete machine) • 9 MHz (master reference frequency) • 13.5 MHz (Laser “new”) • 27 MHz (Laser “old”) • 54 MHz (Laser for future use) • 81 MHz (distribution frequency) • 108 MHz (Streak camera [near RF Gun; Experimental Hall]) • 1300 MHz (reference frequency for the linear collider) • 1517 MHz (reference frequency for beam position monitors) • 2856 MHz (“LOLA” = transverse deflecting cavity for bunch measurements) DESY MHF-p

  5. Block diagramme of MO (low level part) DESY MHF-p

  6. Phase noise requirements for the 1.3 GHz reference frequency DESY MHF-p

  7. Phase noise performance of a 27 MHz crystal oscillator DESY MHF-p

  8. Phase noise performance of a 81 MHz crystal oscillator Phase noise is better above 400 Hz from carrier! DESY MHF-p

  9. MO front panel(low level part) DESY MHF-p

  10. Layout of the Reference frequency distribution system for TTF2 DESY MHF-p

  11. The problem of long coaxial distribution links:Attenuation of coaxial cable vs frequency DESY MHF-p

  12. Phase stability of coaxial cable vs. Temperature½ ´´ cable DESY MHF-p

  13. Phase stability of coaxial cable vs. Temperature7/8 ´´ cable DESY MHF-p

  14. Advantages and disadvantages of coaxial cables Coaxial cables for distribution: - high attenuation (e.g. 7/8“ @ 1.3GHz A / 100m = 8dB) - physical dimensions - require temperature stabilization - can cause ground loops and pick up EMI Fiber Optics for monitoring : - require active temperature stabilization - the system components are more expensive in comparison to coaxial line system components - high amplitude noise of a FO link Solution: A combination of both technologies will be implemented and studied at TTF2. DESY MHF-p

  15. Fiber optic distribution scheme DESY MHF-p

  16. First results of fiber optic stabilization DESY MHF-p

More Related