| Paper |
Title |
Page |
| WEA2I1 |
Compensation of Third-order Resonances in the High Intensity Regime |
215 |
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- C.E. Gonzalez-Ortiz
MSU, East Lansing, Michigan, USA
- R. Ainsworth
Fermilab, Batavia, Illinois, USA
- P.N. Ostroumov
FRIB, East Lansing, Michigan, USA
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As the Fermilab Accelerator Complex enters the high-intensity era, the Recycler Ring (RR) needs to mitigate the detrimental effect of third-order resonance crossing. Third-order resonance lines can be compensated to first order by cancelling out the global Resonance Driving Terms (RDTs) using the response matrix method. This compensation scheme has been proven to work at low intensities, i.e., in the single-particle regime. In order to evaluate the effectiveness of this compensation scheme at higher intensities, this study looks at dynamic and static tune scans, with and without resonance compensation, and different space charge tune shifts. Special care was taken in order to disentangle effects from space charge tune shift, structure resonances and space charge driven resonances.
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Slides WEA2I1 [6.714 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-HB2023-WEA2I1
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| About • |
Received ※ 02 October 2023 — Revised ※ 07 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 09 October 2023 |
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| THAFP03 |
Measurement of Stability Diagram at IOTA at Fermilab |
400 |
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- M.K. Bossard, Y.K. Kim
University of Chicago, Chicago, Illinois, USA
- R. Ainsworth, N. Eddy
Fermilab, Batavia, Illinois, USA
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Funding: Fermilab
Nonlinear focusing elements can enhance the stability of particle beams in high-energy colliders by means of Landau Damping, through the tune spread which is introduced. We propose an experiment at Fermilab’s Integrable Optics Test Accelerator (IOTA) to investigate the influence of nonlinear focusing elements on the transverse stability of the beam. In this experiment, we employ an anti-damper, an active transverse feedback system, as a controlled mechanism to induce coherent beam instability. By utilizing the anti-damper, we can examine the impact of the nonlinear focusing element on the beam’s transverse stability. The stability diagram, a tool used to determine the system’s stability, will be measured using a recently demonstrated method at the LHC. This measurement is carried out experimentally by selecting specific threshold gains and measuring them for a range of phases. The stability diagram is represented by gei¿ on the complex plane. The experiment at IOTA adds insight towards the stability diagram measurement method by supplying a reduced machine impedance, to investigate the impedance’s effect on the stability diagram, as well as a larger range of phase measurements.
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Slides THAFP03 [1.331 MB]
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Poster THAFP03 [1.692 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-HB2023-THAFP03
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| About • |
Received ※ 06 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 12 October 2023 |
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| THAFP04 |
Investigation of Tail-dominated Instability in the Fermilab Recycler Ring |
403 |
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- O. Mohsen, R. Ainsworth, A.V. Burov
Fermilab, Batavia, Illinois, USA
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In our recent operational run, a single bunch, tail-dominated instability was observed in the Fermilab Recycler ring. This instability exclusively occurs in the vertical plane when the chromaticity is close to zero. In this study, we conduct a detailed analysis of this instability under different operational parameters. We investigate the impact of space charge on the head-tail motion and propose potential interpretations of the underlying mechanism of the instability. Moreover, we explore methods to mitigate this instability in the future.
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Slides THAFP04 [1.429 MB]
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Poster THAFP04 [0.892 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-HB2023-THAFP04
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| About • |
Received ※ 25 September 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 29 October 2023 |
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| THBP30 |
Linear Modelling and Lattice Correction from Betatron Phase Measurements at the Fermilab Recycler NOvA Ring |
534 |
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- M. Xiao, R. Ainsworth, K.J. Hazelwood, M.-J. Yang
Fermilab, Batavia, Illinois, USA
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Utilizing the measurement of coherent betatron oscilla-tion phase has emerged as a fast and precise approach for identifying and rectifying errors in achieving a desired lattice in CESR (Cornell Electron Storage Ring), using TAO analysis program and BMAD subroutines. One key advantage of betatron phase measurement over ¿ meas-urement is its sensitivity to phase variations between detectors. This software package has been successfully implemented for the Recycler Ring at Fermilab, with the adaptation of different hardware installations. By em-ploying this technique, a linear model of the bare Recy-cler ring was established, enabling the correction of quadrupole errors.
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Poster THBP30 [1.476 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-HB2023-THBP30
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| About • |
Received ※ 19 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 27 October 2023 |
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