NLC Timing and RF Phase Transmission System
The NLC requires the distribution of timing and RF phase information throughout the 30 Kilometer length of the machine. We plan to meet these two requirements with a single system which uses phase-length stabilized optical fibers. The system is configured as a "star" network, with a separate link to each sector. Within each sector, the timing and phase information is distributed using a local fiber network. Thermal and other drifts in the fiber length are compensated using a feedback which stabilizes the return phase of the signal reflected from the far end of the fiber. The required system parameters are:
| Parameter | Requirement | Demonstrated |
| Maximum Link Length | 15 Km | 15Km |
| Timing Stability | <5psec (long term) | not measured |
| Trigger jitter RMS. | <10psec | not measured |
| RF phase stability | <1 degree X-band (for <1 second) | <0.5 degrees X-band |
| RF phase stability | <20 degree X-band (5psec) (long term) | <4 degrees X-band over 3 days. |
| RF phase jitter RMS. | <0.3 degree X-band | < 0.6 degree X-band |
| Transmission frequency | 714 MHz | 357MHz for prototype |
| Timing resolution | 1 psec | NA |
| Triggering capabilities | Trigger.htm | NA |
| Frequency stability | 3x10-9* | NA |
* This is required to prevent frequency changes from being interpreted as phase length changes in the fibers.
Status report 12/1/1999 status(framemaker format) status(adobe pdf format) status(postscrip format)
Status report 2/1/2000 status(framemaker format), status(adobe pdf format)
Talk 3/3/2000 talk.pdf talk.fm
Status report 5/17/00 status.pdf
Talk at Fermi Lab 5/30/00 talk.pdf talk.fm
Slides for talk at Fermi Lab 2/23/01 talk.pdf
Notes and talks about the timing system: Notes
Link to the Controls Department NLC Timing System page: Timing
Page by Josef Frisch frisch@slac.stanford.edu 04/22/2002
Links to: the NLC Home Page, the SLAC and KEK Institutional Home Pages.