An RF & High-Speed Acquisition Systems for High-Gradient Tests at CLIC Test Facility Raquel Fandos

2 Outline The purpose of an RF Acquisition System The monitored signals Why do we want a New System? New Signals for the New System Next Configuration of the System Status –What has been already done –What will be ready for the beginning and for the middle of the run

3 Purpose of an RF Acquisition System Most basic DIAGNOSTIC for our RF structures in different parts of the system: –Field/power levels –Pulse length/shape CONDITIONING. We want to be able to detect a breakdown and stop the machine. Mechanisms: –Faraday Cup threshold –Vacuum levels –Missing energy detection A scope based system would be enough for these purposes.

4 Further purposes 1. AUTOMATIC CONDITIONING 2. STORAGE and efficient PROCESSING of the DATA 3. LARGER NUMBER of analyzed signals 4. High gradient experiments (breakdown rate, etc) Desired characteristics Real Time processing Robust and fast system Modularity (more signals to be added) Solution: Digitizer Cards, C program on Linux. Suitable System However, we also want

5 The Facility and the Monitored Signals INCIDENT power in CTF2 ATTENUATED power INCIDENT power REFLECTED power TRANSMITTED power Power SourceAc. Struct.Att. INCIDENT current to PETS TRANSMITTED current from PETS FARADAY CUP signal BPM DirCoup CURRENT SIGNALS: –30GHz RF Signals –Faraday Cup Signal –Signals from 2 BPMs POSSIBLE FUTURE SIGNALS: –2-Beam Test Stand Signals –Acoustic Sensors Signals –Vacuum Level Signals Pets: power source Dc: 50db

6 The Electronics Scheme Card 1 Fast processing (C over Linux) Technical Network GPIB/Eth Remote Control Attenuators CLIC Test Facility Electronics Building Control Room Calibration DATA FC BPMs 30GHz signals Card 2 Card 6 1 Down Mixing Box (1.5GHz) IQ Box IQ Box Scopes User Interface (Java, Matlab) Calibration Data Updater (Lab View) 1.5GHz6 Down Mixing Box (1.5GHz) 31.5GHz 1 6

7 The Down Mixing Box 30GHz 1.5ghz BB

8 The Down Mixing Box

9 The IQ Demodulating Box IQ RF LO I Q

10 The IQ Demodulating Box

11 The Digitizer Cards 1GHz bandwidth (ns scale resolution, breakdown 5ns) 1Gs/s sampling rate Acquisition memory kpoints

12 Calibration of the system When we see this pulse in the scope, what power level do we actually have in the machine? or these I&Q signals on the screen of the computer,

13 Calibration of the system INCIDENT power in CTF2 ATTENUATED power INCIDENT power REFLECTED power TRANSMITTED power Power SourceAc. Struct.Att. INCIDENT current to PETS TRANSMITTED current from PETS FARADAY CUP signal BPM DirCoup 1.Cold RF measurements of accelerating structure directional couplers waveguide circuit 2. Measurement of wr28 waveguide lines from CTF2 to electronic system (in klystron gallery)

14 Calibration of the system Card 1 Fast processing (C over Linux) Remote Control Attenuators CLIC Test Facility Electronics Building Control Room 30GHz signals Card 2 1 IQ Box Scopes GHz Joint measurement of the losses of: downmixing box + lines to control room+scope 5. Joint measurement of the losses the downmixing box + IQ box + digitizer cards 3. Characterization of the variable attenuators Down Mixing Box (1.5GHz)

15 Calibration of the system Card 1 Fast processing (C over Linux) Klystron Gallery Control Room Card 2 IQ Box Scopes Down Mixing Box (1.5GHz) 31.5GHz 30GHz synthesizer DirCoup Power Meter Isolator

16 Calibration of the system

17 Thank you Questions?

18 The 31.5GHz Generating Box

19 The 31.5GHz Generating Box