1. 11th February 201016th CTF3 Committee - Wilfrid Farabolini1 Status and progress of the CTF3 probe beam 1

2. 11th February 201016th CTF3 Committee - Wilfrid Farabolini22 Results of the last run (up to 14 th dec. 09) Beam charge: Immediately after photo-cathode regeneration 0.7 nC/bunch After few days 0.25 nC/bunch (QE = 0.3 %) Emittance: the problem seems solved (  normalized < 20 mm.mrad) Energy : still around 140 MeV despite higher RF compression Beam position stability: to be improved BPM calibration : to be resume during next period

3. 11th February 201016th CTF3 Committee - Wilfrid Farabolini33 Emittance measurements The waist is very tiny (0.1 mm) on OTR screen. Higher optical magnification used for better resolution(1.75 instead of 0.36) Simultaneous automatic scan in X and Y Use of the OTR screen is mandatory : improve yield with alumina deposition on the silicon screen. Accurate tuning of the gun coils is necessary.

4. 11th February 201016th CTF3 Committee - Wilfrid Farabolini44 BPM calibration 1/3 Re-entrant Cavity at CALIFE with 5 mm offset and charge = 0.6 nC Resolution : < 5 µm (simulated) with 0.1 mm offset and charge = 0.6 nC Resolution : < 0.5 µm (simulated) A complex electronic to be tuned. Up to now only the sum signals demodulated on a diode were used Problem with phase stability of the reference signal and/or position stability of the beam

5. 11th February 201016th CTF3 Committee - Wilfrid Farabolini55 BPM calibration 2/3 Beam charge calibration is OK (obtained by varying laser power) Beam position when delta signal is demodulated with a diode is fine.. But more problematic when send to the dedicated electronics (obtained with corrector scan) Demodulated I/Q signal Computed beam position as function of time With diodes With I/Q demodulator

6. 11th February 201016th CTF3 Committee - Wilfrid Farabolini66 BPM calibration 3/3 Tuning of the electronics to be resume during next run (choice of reference frequency signal, attenuator settings…) Possibly a real problem with beam position stability (I/Q have a much better resolution that diodes) Laser position stability (transport line mirrors and lens to be investigated) HV pulse from modulator MKS 30 known to have ripple (tuning to be resume)

7. 11th February 201016th CTF3 Committee - Wilfrid Farabolini77 THE POWER PHASE SHIFTER IS INSTALLED On place in the CLEX gallery 28/jan/2010 phase/position relation (1 deg / mm) Phase S12 (deg) Déplacement (mm) S22 (dB) Reflected power vs. frequency for various positions Compression Accélération 180 MeV

8. 11th February 201016th CTF3 Committee - Wilfrid Farabolini88 How does it work ? Fixed Fixed Movable Guided wavelength depends on the transverse waveguide size Cylindrical WG TE 01 no electric field on the walls ! TE 10 □ TE 01 ○ E Field Rectangular to circular mode convertor

9. 11th February 201016th CTF3 Committee - Wilfrid Farabolini9 On going works Development of 2 new MTVs (Califes like) for the TBTS lines with Uppsala University To be installed before 15 th march Development of a user friendly interface for Califes on the same model as for TBTS in Labview by the EN/ICE group RF phase and power coupler calibration on the accelerating structures

10. 11th February 201016th CTF3 Committee - Wilfrid Farabolini10 Conclusions We are ready to resume operations with better diagnostics and to experience the phase shifter. Probe Beam should now be experienced in the ACS.