A high-resolution multi-slit phase space measurement technique for low-emittance beams

Thangaraj, J. C. T.; Piot, P.

doi:10.1063/1.4773793

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that while single-shot emittance measurements for accelerators do exist (e.g. multi-slit and pepper-pot masks [35][36][37][38]), they are generally not suitable for all types of beams and beamline layouts, including beams at the LCLS.…”

Section: The Challenges Of Emittance Optimizationmentioning

confidence: 99%

Multipoint-BAX: a new approach for efficiently tuning particle accelerator emittance via virtual objectives

Ayoub Miskovich,

Neiswanger,

Colocho

et al. 2024

Mach. Learn.: Sci. Technol.

View full text Add to dashboard Cite

Although beam emittance is critical for the performance of high-brightness accelerators, optimization is often time limited as emittance calculations, commonly done via quadrupole scans, are typically slow. Such calculations are a type of multipoint query, i.e. each query requires multiple secondary measurements. Traditional black-box optimizers such as Bayesian optimization are slow and inefficient when dealing with such objectives as they must acquire the full series of measurements, but return only the emittance, with each query. We propose a new information-theoretic algorithm, Multipoint-BAX, for black-box optimization on multipoint queries, which queries and models individual beam-size measurements using techniques from Bayesian Algorithm Execution (BAX). Our method avoids the slow multipoint query on the accelerator by acquiring points through a virtual objective, i.e. calculating the emittance objective from a fast learned model rather than directly from the accelerator. We use Multipoint-BAX to minimize emittance at the Linac Coherent Light Source (LCLS) and the Facility for Advanced Accelerator Experimental Tests II (FACET-II). In simulation, our method is 20x faster and more robust to noise compared to existing methods. In live tests, it matched the hand-tuned emittance at FACET-II and achieved a 24% lower emittance than hand-tuning at LCLS. Our method represents a conceptual shift for optimizing multipoint queries, and we anticipate that it can be readily adapted to similar problems in particle accelerators and other scientific instruments.

show abstract

Section: The Challenges Of Emittance Optimizationmentioning

confidence: 99%

Multipoint-BAX: a new approach for efficiently tuning particle accelerator emittance via virtual objectives

Ayoub Miskovich,

Neiswanger,

Colocho

et al. 2024

Mach. Learn.: Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…These included fluorescent screens (practical and very sensitive, but low spatial resolution), OTRbased monitors (less sensitive, but better spatial resolution, down to 10 um range), and wire-scan BPMs (most accurate for the smallest beam sizes, but limited to projection measurements). C. Thangaraj in a poster presented a nice idea to improve the resolution in pepper-pot based emittance measurement using a properly designed transport between the mask and the detector screen [22]. If one could devise instead of a drift a transport line to magnify the image of the slit, the resolution of the measurement could be greatly increased.…”

Section: Beam Diagnosticsmentioning

confidence: 99%

Summary report of Working Group 5: Beam and radiation generation, monitoring and control

Musumeci¹,

Tilborg²

2013

AIP Conference Proceedings

View full text Add to dashboard Cite

A high-resolution multi-slit phase space measurement technique for low-emittance beams

Cited by 2 publications

References 7 publications

Multipoint-BAX: a new approach for efficiently tuning particle accelerator emittance via virtual objectives

Multipoint-BAX: a new approach for efficiently tuning particle accelerator emittance via virtual objectives

Summary report of Working Group 5: Beam and radiation generation, monitoring and control

Contact Info

Product

Resources

About