1. 31.05.2005Krzysztof Czuba1 REFERENCE FREQUENCY DISTRIBUTION SYSTEM FOR THE TESLA TECHNOLOGY BASED PROJECTS Krzysztof Czuba Matthias Felber

2. 31.05.2005Krzysztof Czuba2 OUTLINE Design requirements System concept System status Future plans

3. 31.05.2005Krzysztof Czuba3 DESIGN REQUIREMENTS Synchronize RF devices along the accelerator with phase error << 1 ps Distributed frequencies: 1.3GHz, 1MHz, 9MHz, 13.5MHz, 27MHz, 108MHz, 1517MHz, 2856MHz Prototype system prepared in TTF2/UVFEL

4. 31.05.2005Krzysztof Czuba4 SYSTEM CONCEPT Master Oscillator Fiber-optic long distance links Short coaxial cable sections Stable local oscillators

5. 31.05.2005Krzysztof Czuba5 MASTER OSCILLATOR - SYSTEM STATUS M.O. module ordered from a commercial company Many components provided to DESY Phase stability tests in progress (B. Lorbeer) Many components improved after first tests Phase stable 1.3 GHz oscillators under development: DRO and SAW investigated

6. 31.05.2005Krzysztof Czuba6 COAXIAL CABLE DISTRIBUTION - STATUS Redundant, prototype cable layout installed in the TTF2 Thermal insulation and heating tape assembled for cable temperature control Loss, length and cable reflections measurements performed Preliminary phase drifts measurements performed – phase drift between outputs of two 260m long cables ~1ps over 24h measurement

7. 31.05.2005Krzysztof Czuba7 TTF2 PHASE REFERENCE DISTRIBUTION CABLE LAYOUT

8. 31.05.2005Krzysztof Czuba8 FIBER OPTIC LINK Phase stable signal distribution over long distances (up to 20 km) Feedback on phase suppressing long term drifts Circulator Long Link Simulator Mirror RF Phase Detector DFB Laser FO Tx FO Rx A Phase Shifter Controller Directional Coupler FO Rx B RF Signal in RF Phase Detector 5 km of single mode fiber in temperature controlled oven Temperature variation Error voltage Output phase check Test - system block diagram

9. 31.05.2005Krzysztof Czuba9 FIBER OPTIC LINK – STATUS Conceptual analysis performed Prepared hardware and control software Two versions of system tested – with spool of fiber and motorized optical delay line as phase shifters Good results and experience achieved –Short term stability (minutes): ~0.8 ps(0.3 ps) –Long term stability (hours): ~4 ps(0.8 ps)

10. 31.05.2005Krzysztof Czuba10 F.O. LINK V.1 - COMPONENTS FIRST SYSTEM TEST IN A CLIMATE CHAMBER Temperature controlled oven Laser transmitter System controller - GUI Phase detector

11. 31.05.2005Krzysztof Czuba11 OPTICAL PHASE SHIFTERS 5 km of fiber. Easy obtainable phase shift of 3500 o at 1.3 GHz Problems with long lag time 10 cm optical length range Phase shift of 160 o at 1.3 GHz 4.7 fs phase change resolution! Fast response

12. 31.05.2005Krzysztof Czuba12 F.O. LINK V.2 COMPONENTS

13. 31.05.2005Krzysztof Czuba13 F.O. LINK V.2 – MEASUREMENT RESULTS (CLIMATE CHAMBER) Short term stability (minutes): ~0.3 ps Long term stability (100 hours measurement duration): ~0.8 ps

14. 31.05.2005Krzysztof Czuba14 F.O. LINK INSTALLED IN TTF2

15. 31.05.2005Krzysztof Czuba15 FUTURE PLANS Finish F.O. system stability tests in the TTF2 Tests of phase drifts of the fiber optic against coaxial cable distribution Development of controller for ODL and fiber spool connected in series for longer distribution distances Phase stable 1.3GHz oscillator development