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Libera CavityBPM
Libera Cavity BPM is a beam position monitor readout system designed to be used in linear machines with cavity-type beam position monitor pickups. Libera Cavity BPM is particularly indicated for FEL undulator sections and interaction points where accurate position measurements are required. The system processes the signals form low-Q and high-Q S-band and C-band cavities providing the user a very precise beam position measurements resolved at single bunch level.
Product Description
Documentation
Testimonials
References
Benefits:
- sub-micrometer measurement capabilities
- directly processing S-band and C-band cavity signals
- extended dynamic range by means of calibrated variable attenuation
- single bunch measurements capabilities with low quality factor cavities support down to 16 ns bunch spacing
- calibrated position readout
Data processing:
Libera CavityBPM acquires the cavity signals by means of frequency conversion and intermediate frequency sampling. Calibrated variable attenuators further increase the instrument dynamic range capabilities. The signals are then processed at FPGA level.
A special deconvolution filtering scheme can be then used to separate partially overlapped bunches. Then a time-domain position calculation algorithm is used to determine the beam position for every single bunch.
Interfaces:
Performance:
Typical position readout standard deviation is < 1µm RMS, at 1mm full scale, for 32 dB dynamic range. (However, it depends also on other factors like: the cavity sensitivity, available signal strength and position measurement range.)
Libera CavityBPM Capabilities
| General product code | LCAV |
| BPM slots | 1 |
| Supported input frequency range | <6.5 GHz |
| A/D conversion | 500 MHz/14 bit |
| Cooling | Passive |
| Power supply | 110/220V |
| Timing signals | Electrical (up to 3) * |
| Calibration | Manual/Static |
| Fast data link | SFP (optional) |
| Maximum input signals* | 16 dBm |
| Input gain/attenuation | Programmable, 31dB |
| Temperature drift, typical | 0,3 μm/°C |
| Position RMS at turn-by-turn data rate | / |
| Position RMS at a fast 10 kHz data rate | / |
| Position RMS at a slow 10 Hz data rate | / |
| Position RMS at single bunch | <1 μm |
| Position RMS at macro pulse/continuous wave | <1 μm |
| Dimensions | H:1 U, W:19" (rack mountable), D: 236 mm |
*Can be customized
Libera CavityBPM Functionalities
| Bunch-by-bunch processing | Yes |
| Turn-by-turn processing | No |
| Real-time data streaming | Optional |
| Slow data | No |
| Gain control | Yes |
| Multi-chassis synchronization | Trigger-based |
| Data time stamping | Trigger-counter |
| Interlock detection and output | No |
| Postmortem capability | No |
| Single-pass measurement | Yes |
| Frequency down-conversion | Internal (with mixer) |
| Additional Digital I/O channels and Analog output | No |
| Closed Orbit Feedback Application | No |
Libera CavityBPM
Libera Cavity BPM is used at the following labs:
- CLARA – STFC Daresbury Laboratory (STFC ASTeC), United Kingdom
- Eli Beamlines – Extreme Light Infrastructure (ELI), Chzech Republic
- ELI-NP, EuPRAXIA – Laboratori Nazionali di Frascati dell’INFN, Italy
- SPring-8 – Japan Synchrotron Radiation Research Institute (JASRI), Japan
