Michael Ehrlichman
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View article: Design Initiative for a 10 TeV pCM Wakefield Collider
Design Initiative for a 10 TeV pCM Wakefield Collider Open
This document outlines a community-driven Design Study for a 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need for Advanced Accelerator R\&D, and the 2023 P5 Report calls for the ``delivery of an end-to-en…
View article: Swiss Light Source upgrade lattice design
Swiss Light Source upgrade lattice design Open
Following the spectacular success of the third-generation light source over the past decades, a few new-generation light sources based on the multibend achromat (MBA) scheme have come into operation. Other such facilities are also under co…
View article: Demonstration of machine learning-enhanced multi-objective optimization of ultrahigh-brightness lattices for 4th-generation synchrotron light sources
Demonstration of machine learning-enhanced multi-objective optimization of ultrahigh-brightness lattices for 4th-generation synchrotron light sources Open
Fourth-generation storage rings enabled by multi-bend achromat lattices are being inaugurated worldwide and many more are planned for the next decade. These sources deliver stable ultra-high brightness radiation with unmatched levels of tr…
View article: Three-dipole kicker injection scheme for the Advanced Light Source upgrade accumulator ring
Three-dipole kicker injection scheme for the Advanced Light Source upgrade accumulator ring Open
The Advanced Light Source Upgrade will implement on axis single-train swap-out injection employing an accumulator between the booster and storage rings. The accumulator ring (AR) design is a twelve period triple-bend achromat that will be …
View article: The Three-Dipole Kicker Injection Scheme for the ALS-U Accumulator Ring
The Three-Dipole Kicker Injection Scheme for the ALS-U Accumulator Ring Open
The ALS-U light source will implement on-axis single-train swap-out injection employing an accumulator between the booster and storage rings. The accumulator ring design is a twelve period triple-bend achromat that will be installed along …
View article: ATS/STA Transfer Line Design for the ALS Upgrade Project (ALS-U)
ATS/STA Transfer Line Design for the ALS Upgrade Project (ALS-U) Open
At the Advanced Light Source Upgrade (ALS-U), an on-axis swap-out injection will be used to replenish depleted bunches in the storage ring with refreshed bunches from the full energy accumulator ring. To implement this scheme, two transfer…
View article: The Three Dipole Kicker Injection Scheme for the ALS-U Accumulator Ring
The Three Dipole Kicker Injection Scheme for the ALS-U Accumulator Ring Open
The ALS-U light source will implement on-axis swap-out injection of individual trains employing an accumulator between the booster and storage rings. The accumulator ring design is a twelve period triple-bend achromat that will be installe…
View article: Enhancing the MOGA Optimization Process at ALS-U with Machine Learning
Enhancing the MOGA Optimization Process at ALS-U with Machine Learning Open
The bare lattice optimization for the linear and nonlinear ALS-U storage ring lattice, even without reverse bending, comprises 11 degrees of freedom (DoF) and is therefore a very complex and highly time-consuming process. This design proce…
View article: The Impact of Short-Range Wakes on Injection Into the ALS-U Accumulator Ring
The Impact of Short-Range Wakes on Injection Into the ALS-U Accumulator Ring Open
As part of the ALS-U design, bunches with small charge will be added to the accumulator ring in a manner that initially leaves both the stored and injected bunches displaced from the nominal orbit. While the beam current is below instabili…
View article: Multi-Bunch Resistive Wall Wake Field Tracking via Pseudomodes in the ALS-U Accumulator Ring
Multi-Bunch Resistive Wall Wake Field Tracking via Pseudomodes in the ALS-U Accumulator Ring Open
For the ALS-U project, particles will be injected from the booster to the accumulator ring utilizing an injection scheme that leaves the stored and injected particles with a non-trivial transient. This transient requires that multibunch fe…
View article: Single Bunch Instability Simulations in the Storage Ring of the ALS-U Project
Single Bunch Instability Simulations in the Storage Ring of the ALS-U Project Open
As the broad-band impedance modeling and the vacuum chamber design of the new Advanced Light Source storage ring (ALS- U) reach maturity, we report on progress in single-bunch collective effects studies. A pseudo-Green function wake repres…
View article: Development of a Decoherence Kicker for the ALS Upgrade Project (ALS-U)
Development of a Decoherence Kicker for the ALS Upgrade Project (ALS-U) Open
The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory is upgrading the existing storage-ring lattice to a nine-bend-achromat lattice with on-axis swap-out injection. The upgraded storage ring will provide a highly focuse…
View article: First Attempts at Applying Machine Learning to ALS Storage Ring Stabilization
First Attempts at Applying Machine Learning to ALS Storage Ring Stabilization Open
The ALS storage ring operates multiple feedbacks and feed-forwards during user operations to ensure that various source properties such as beam position, beam angle, and beam size are maintained constant. Without these active corrections, …
View article: Commissioning Simulation Study for the Accumulator Ring of the Advanced Light Source Upgrade
Commissioning Simulation Study for the Accumulator Ring of the Advanced Light Source Upgrade Open
The Advanced Light Source Upgrade (ALS-U) to a diffraction-limited soft x-rays light source requires the construction of an Accumulator Ring (AR) to enable swap-out, on-axis injection. The AR lattice is a Triple-Bend-Achromat lattice simil…
View article: Design Progress of ALS-U, the Soft X-ray Diffraction Limited Upgrade of the Advanced Light Source
Design Progress of ALS-U, the Soft X-ray Diffraction Limited Upgrade of the Advanced Light Source Open
The ALS-U project to upgrade the Advanced Light Source to a multi bend achromat lattice received CD-1 approval in 2018 marking the end of its conceptual design phase. The ALS-U design promises to deliver diffraction limited performance in …
View article: Measurement of Transverse Impedance of Specific Components in CESR Using BPM Measurements of Pinged Bunches
Measurement of Transverse Impedance of Specific Components in CESR Using BPM Measurements of Pinged Bunches Open
A beam-based technique is applied to determine the quadrupole impedance of large-impedance components of the CESR storage ring. Two bunches separated by 1/3 of the ring circumference are charged to 1.44 × 1010 and 0.48 × 1010 N/bunch (0.9 …
View article: Beam-Based Sextupolar Nonlinearity Mapping in CESR
Beam-Based Sextupolar Nonlinearity Mapping in CESR Open
In order to maintain beam quality during transport through a storage ring, sextupole magnets are used to make chromatic corrections, but necessarily introduce deleterious effects such as nonlinear resonances and reduced dynamic aperture. I…
View article: Proposed Upgrade of the SLS Storage Ring
Proposed Upgrade of the SLS Storage Ring Open
A new storage ring is planned for the upgrade of the Swiss Light Source (SLS). It will replace the 12 triple bend achromats by twelve 7-bend achromats, which are based on low aperture longitudinal gradient bends (LGBs) and anti-bends (ABs)…
View article: Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer
Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer Open
An upgrade to the SLS is currently under development. This upgrade will likely utilize the same hall and same machine circumference, 288 m, of the SLS. Achieving a sufficiently low emittance with such a small circumference requires tight f…
View article: Design Studies for an Upgrade of the SLS Storage Ring
Design Studies for an Upgrade of the SLS Storage Ring Open
An upgrade of the Swiss Light Source (SLS) would replace the existing storage ring by a low aperture multibend achromat lattice providing an emittance of about 100–200 pm at 2.4 GeV, while maintaining the hall, the beam lines and the injec…
View article: Round Beam Operation in Electron Storage Rings and generalisation of Mobius accelerator
Round Beam Operation in Electron Storage Rings and generalisation of Mobius accelerator Open
A better performing photon beam can be obtained from light sources when the eletron beam is formed into a "round beam" rather than a flat beam. It is realised by equally distributing the natural emittance into the horizontal and vertical p…