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Stochastic Cooling Enhanced Steady-State Microbunching

Xiujie Deng

TL;DR

The paper addresses the challenge of delivering bright, short-wavelength radiation from a compact accelerator source by merging optical stochastic cooling (OSC) with steady-state microbunching (SSMB). It analyzes reversible modulation schemes (HGHG, Echo, PEHG/ADM) and demonstrates that OSC can substantially accelerate damping in a ~50 m ring, enabling radiation at $\lambda_R = 100\ \mathrm{nm}$ with beam energies on the order of a few hundred MeV. An OSC-HGHG-SSMB layout with an induction-linac energy compensator and barrier bucket is presented, including a concrete parameter set that yields ~1 kW peak power at $100\ \mathrm{nm}$ and ~0.5 kW average radiation, supported by damping-rate, bandwidth, and IBS considerations. The work suggests a practical, compact light source suitable for university-scale facilities, while highlighting remaining challenges in amplifier availability at short wavelengths and precise phase locking for perfect modulation cancellation.

Abstract

In this paper, we propose to combine two promising research topics in accelerator physics, i.e., optical stochastic cooling (OSC) and steady-state microbunching (SSMB). Our study shows that such an OSC-SSMB storage ring with a circumference of 50 m and beam energy of several hundred MeVs using present technology can deliver kilowatt radiation at 100 nm wavelength. A more ambitious application of OSC in an SSMB ring can push the radiation wavelength to an even shorter wavelength, such as EUV and soft X-ray. Such a powerful compact light source could benefit fundamental science research and industry applications.

Stochastic Cooling Enhanced Steady-State Microbunching

TL;DR

The paper addresses the challenge of delivering bright, short-wavelength radiation from a compact accelerator source by merging optical stochastic cooling (OSC) with steady-state microbunching (SSMB). It analyzes reversible modulation schemes (HGHG, Echo, PEHG/ADM) and demonstrates that OSC can substantially accelerate damping in a ~50 m ring, enabling radiation at with beam energies on the order of a few hundred MeV. An OSC-HGHG-SSMB layout with an induction-linac energy compensator and barrier bucket is presented, including a concrete parameter set that yields ~1 kW peak power at and ~0.5 kW average radiation, supported by damping-rate, bandwidth, and IBS considerations. The work suggests a practical, compact light source suitable for university-scale facilities, while highlighting remaining challenges in amplifier availability at short wavelengths and precise phase locking for perfect modulation cancellation.

Abstract

In this paper, we propose to combine two promising research topics in accelerator physics, i.e., optical stochastic cooling (OSC) and steady-state microbunching (SSMB). Our study shows that such an OSC-SSMB storage ring with a circumference of 50 m and beam energy of several hundred MeVs using present technology can deliver kilowatt radiation at 100 nm wavelength. A more ambitious application of OSC in an SSMB ring can push the radiation wavelength to an even shorter wavelength, such as EUV and soft X-ray. Such a powerful compact light source could benefit fundamental science research and industry applications.

Paper Structure

This paper contains 18 sections, 10 equations, 4 figures, 1 table.

Table of Contents

  1. Introduction
  2. SSMB Scenarios
  3. Globally Microbunching / Longitudinal Focusing
  4. Locally Microbunching / Reversible Modulation
  5. Motivation of a Faster Damping
  6. OSC Basics
  7. Cooling Mechanism and Damping Rate
  8. Bandwidth Limit
  9. Mixing Condition
  10. Radiation Kick Strength
  11. Equilibrium Energy Spread
  12. Combine OSC with Reversible SSMB
  13. Schematic Setup and Parameters List
  14. Induction Linac and Barrier Bucket
  15. Intrabeam Scattering
  16. ...and 3 more sections

Figures (4)

  • Figure 1: Schematic layouts of a longitudinal weak focusing (top), longitudinal strong focusing (center) and generalized longitudinal strong focusing (bottom) SSMB storage ring.
  • Figure 2: Schematic layouts of a reversible HGHG (top), reversible EEHG (center) and reversible PEHG/ADM (bottom) SSMB storage ring.
  • Figure 3: Schematic layout of applying OSC in a reversible HGHG SSMB storage ring.
  • Figure 4: The schematic layout of applying an induction linac for energy compensation and barrier bucket formation.