Obvious and non-obvious aspects of digital Self-Excited-Loops for SRF cavity control
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912652857442304 |
|---|---|
| author | Doolittle, Larry Murthy, Shreeharshini Guran, Matei Reyes, Lennon Raman, Shrividhyaa Sankar Varghese, Philip |
| author_facet | Doolittle, Larry Murthy, Shreeharshini Guran, Matei Reyes, Lennon Raman, Shrividhyaa Sankar Varghese, Philip |
| contents | In 1978, Delayen showed how Self-Excited Loops (SEL) can be used to great advantage for controlling narrow-band SRF cavities. Its key capability is establishing closed-loop amplitude control early in the setup process, stabilizing Lorentz forces to allow cavity tuning and phase loop setup in a stable environment. As people around the world implement this basic idea with modern FPGA DSP technology, multiple variations and operational scenarios creep in that have both obvious and non-obvious ramifications for latency, feedback stability, and resiliency. This paper will review the key properties of a Delayen-style SEL when set up for open-loop, amplitude stabilized, and phase-stabilized modes. Then the original analog circuit will be compared and contrasted with the known variations of digital CORDIC-based implementations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14835 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Obvious and non-obvious aspects of digital Self-Excited-Loops for SRF cavity control Doolittle, Larry Murthy, Shreeharshini Guran, Matei Reyes, Lennon Raman, Shrividhyaa Sankar Varghese, Philip Accelerator Physics In 1978, Delayen showed how Self-Excited Loops (SEL) can be used to great advantage for controlling narrow-band SRF cavities. Its key capability is establishing closed-loop amplitude control early in the setup process, stabilizing Lorentz forces to allow cavity tuning and phase loop setup in a stable environment. As people around the world implement this basic idea with modern FPGA DSP technology, multiple variations and operational scenarios creep in that have both obvious and non-obvious ramifications for latency, feedback stability, and resiliency. This paper will review the key properties of a Delayen-style SEL when set up for open-loop, amplitude stabilized, and phase-stabilized modes. Then the original analog circuit will be compared and contrasted with the known variations of digital CORDIC-based implementations. |
| title | Obvious and non-obvious aspects of digital Self-Excited-Loops for SRF cavity control |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2510.14835 |