Speaker
Description
The ALS has been running with an in-house designed Beam Position Monitor for over 10 years. A new design has been developed for the ALS-U project. It includes 8 inputs per pizza-box chassis, an improved Pilot Tone generation for the two button sets, a modular packaging for upgrades and adapting to other machine RF, and improved performance.
The ALS-U BPM uses an AMD Gen3 RFSOC, which provides eight 5GSPS 14-bit ADC and 10GSPS 14-bit DACs. Increasing the ADC sampling rate from the original 117MHz of the ALS design to the new 5GSPS simplified the design of the Analog Front End. The on-board DACs eliminated the separate chassis used at ALS for PilotTone generation, and is more flexible than the previous PLL design.
The RFSOC provides a Digital UP & Down Conversion blocks; the ADC data rate to a 40x DDC rate that is easily processed by the FPGA programmable logic, while a 40x DUC is used for the 2-Tone Pilot Tone Generation of the DAC to reduce table length. The current firmware which handles position generation for two button sets uses less than half of the available FPGA resources.
A full chassis with 8 AFE and 2 PilotTone modules has been built, and tested in both the lab and at ALS. A second chassis is being built. Production builds start this year to support AR commissioning in 2027.
| I have read and accept the Privacy Policy Statement | Yes |
|---|---|
| Supervisor's name | Jonah Weber |
| Supervisor's email | jmweber@lbl.gov |
| Paper submission software | OTD |