1. Detecting phase Alexandra Andersson Jonathan Sladen
An update on the work on the phase detector for RF syncronisation of CLIC is presented. First results of beam tests, and some offline tests of the full system are presented.
This presentation is supported by the Commission of the European Communities under the 6th Framework Programme “Structuring the European Research Area”, contract number RIDS

2. System Specifications
Phase accuracy: 0.1º
Amplitude range: ~6dB
Bandwidth: 50MHz, system investigated up to 250MHz

3. CTF3 Pulse to pulse beam jitter
CTF3 beam jitter greatly exceeds the required system accuracy.
Two system are built and compared with each other.

4. CTF3 installation

5. CTF3 installation

6. IF phase detection
LO generation
CTF test setup
Down mixing

7. Static calibration

8. Static calibration curves
Amplifier after mixer limits useful calibration
range to a maximum of 22dBm
From these curves the amplitude dependant
phase multiplication factor, as well as offset,
are computed

9. Test of static calibration routine, offline pulses.

10. CTF3 results (1)

11. CTF results (2) Beam data was recorded above the upper
limit of the calibration range
Fit is not completely terrible

12. CTF3 results (3) This is the noise for two systems
Noise will increase when amplitude dependent phase offset correction is applied
Noise measurements look promising at both 250MHz and 50MHz

13. Work to be completed:
Complete static correction algorithm to correct amplitude dependant phase offset
Develop a dynamic correction algorithm to correct step response of the system
Characterise temperature drift
Improve calibration routine
Hardware modifications of down converters
Further beam tests