XFEL The European X-Ray Laser Project X-Ray Free-Electron Laser
1 Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting, 3-4 December 2007
Downconverter Cavity Field Detection for the ATCA System F.Ludwig,
M.Hoffmann, DESY K.Suchecki, WUT-ISE H. PielCryoelectra GmbH Slide
2 Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting, 3-4 December 2007 XFEL
The European X-Ray Laser Project X-Ray Free-Electron Laser 2
Outline Cavity Field Detection Requirements Downconverter for LLRF
Achieved Performance from FLASH studies Main and Booster Section
Downconverter Injector and 3 rd Harmonic Section Downconverter Most
important problems Automated Drift Calibration Project status and
plans Slide 3 Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting, 3-4
December 2007 XFEL The European X-Ray Laser Project X-Ray
Free-Electron Laser 3 Cavity Field Detection Requirements Amplitude
and Phase stability : Requirements for different LLRF-stations:
(ACC4,ACC5,ACC6) Slide 4 Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting,
3-4 December 2007 XFEL The European X-Ray Laser Project X-Ray
Free-Electron Laser 4 Downconverter for LLRF Relevant sections for
the detection of the cavity field : - Reference - Mixer - ADCs -
Timing Slide 5 Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting, 3-4
December 2007 XFEL The European X-Ray Laser Project X-Ray
Free-Electron Laser 5 Downconverter for LLRF Intermediate frequency
[10MHz, 50MHz]: Master- Oscillator ADC LO-input ADC clock BPF
RF-input Digital I,Q- Detection CIC Filter Receiver CH1 LNA
Sampling and Field Detection LO and CLK Generation Input
Calibration Muti-channel downconverter Sample frequency
[50MHz-130MHz] Single cavity field in amplitude and phase Slide 6
Frank Ludwig, DESY XFEL-LLRF-ATCA Meeting, 3-4 December 2007 XFEL
The European X-Ray Laser Project X-Ray Free-Electron Laser 6
Achieved Performance from FLASH studies Multi-channel downconverter
: 8 channel Gilber-mixer receiver VME based + SIMCON DSP (14-bit
ADCs) VME based Stability results (single channel) : - Shortterm,
bunch-to-bunch (800us) : - Midterm, pulse-to-pulse (10min) : -
Longterm, drifts (1hour) : Pulse-to-Pulse Beam Stability : A =
2e-3/C, P = 0.2/C (Need for drift calibration) 0.022% 0.016%
Desired XFEL value Main and Booster section requirements are
fulfilled - Injector and 3 rd harmonic requirements only nearly.
Can the ATCA system fulfill this too? Slide 7 Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007 XFEL The European X-Ray
Laser Project X-Ray Free-Electron Laser 7 Main and Booster Section
Downconverter Rear Transition Module (RTM) Receiver : LT5527
(Gilbert-Mixer) RF: 1300MHz,
