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 Frond End. The on-board DACs eliminated the separate chassis used at ALS for PilotTone generation, and is much 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 about 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 |
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| Supervisor's name | Jonah Weber |
| Supervisor's email | jmweber@lbl.gov |