Can’t find your discipline or profession? Write to us and we’ll
do our best to work something out.
Every project is unique.
We adjust our services to your needs.
Libera Single Pass E
The aim of a single pass position measurement is to resolve the bunch position from the very short signals produced by a bunch that is passing the beam position detector.
Libera Single Pass E enables high accuracy in bunch position measurements. Via the implemented fast communication protocols, it represents a reliable and deterministic building block for fast-feedback building as well as for fast-forward loops, and thus enables attainment of high beam stability.
Product Description
Papers
References
Benefits:
- Analog and real-time digital signal processing and high-level software
- Internal phase alignment of input signals
- Up to four beam processors in one chassis
- Easy to integrate in any control system
Data processing:
The signal processing chain on the Libera Single Pass E is composed of analog signal processing, digitalization on fast ADCs and digital signal processing. It may handle the following beam modes:
- Single-bunch mode
- Bunch train mode
- CW – Continuous Wave
- Various bunch structures
Data processing is initiated on the external trigger signal. The short signal from the detector is first lengthened by the bandpass filters on the analog board (filters are designed in relation to the accelerator parameters). Further signal processing is defined by various parameters defining the processing window for a certain beam mode.
The signal energy is calculated from the signal defined by the processing window. After calculating all four amplitudes, position is calculated using formulas for X and Y. Four options can be used for position calculation:
- Orthogonal pickup orientation
-
- Linear formula
- Polynomial formula – 3rd order
-
- Diagonal pickup orientation
-
- Linear formula
- Polynomial formula – 3rd order
-
In the case of longer beam structures a similar data processing is used – based on the appropriate signal windowing. The data calculation is initiated on the external trigger and is automatically stopped after the bunch structure is over. The decimated batch of data is available to the control system. In the case of CW operation, the unit continuously processes and outputs the decimated beam position data. The external low frequency reference trigger signal needs to be provided for this case.
Libera Single Pass E front panel:
Libera Single Pass E Performance
| Beam mode | Resolution | Note |
|---|---|---|
| Single-bunch | µm range | depending on data processing requirements |
| Longer bunch structure | < 1 µm | depending on decimation rate |
| CW operation | < 1 µm | depending on decimation rate |
Libera Single Pass E Capabilities
| General product code | LSPE |
| Number of input channels (measuring) | 16 (Libera Single Pass E 4/4) / 4 channels/module |
| BPM slots | 1 - 4 |
| Supported input frequency range | <700 MHz |
| A/D conversion | 160 MHz/16 bit |
| Cooling | Active (fans) |
| Power supply | 110/220 V |
| Timing signals | Electrical (4) / Optical |
| Calibration | Manual/Static |
| Fast data link | RJ-45 & SFP |
| Maximum input signals* | <7 V peak pulse voltage |
| Input gain/attenuation | Programmable, 31 dB |
| Temperature drift, typical | 0.3 µm/°C |
| Position RMS at turn-by-turn data rate | / |
| Position RMS at fast 10 kHz data rate | / |
| Position RMS at slow 10 Hz data rate | / |
| Position RMS at single bunch | <1 µm * |
| Position RMS at macro pulse/continuous wave | <1 µm |
| Dimensions | H:2 U, W:19" (rack mountable), D: 310 mm |
*Can be customized
Libera Single Pass E 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 | Yes |
| Postmortem capability | No |
| Single-pass measurement | Yes |
| Frequency down-conversion | Optional ** |
| Additional Digital I/O channels and Analog output | No |
| Closed Orbit Feedback Application | No |
* Requires additional modules
** Requires additional modules: Libera DWC
Libera Single Pass E
Libera Single Pass E is used at the following labs:
- BARC – Bhabha Atomic Research Center (BARC), India
- CAEP – China Academy of Engineering Physics (CAEP), China
- IUAC – Inter University Accelerator Center (IUAC), India
- STAR – Laboratori Nazionali di Frascati dell’INFN, Italy
- Tsinghua University – Tsinghua University, China
