Paper | Title | Other Keywords | Page |
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MO2C03 | Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth | feedback, operation, controls, lattice | 7 |
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Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The fast orbit feedback (FOFB) bandwidth for Advanced photon source upgrade (APS-U) will be DC-1 kHz and the synchrotron frequency will be between 100-560 Hz. This frequency overlap places coupled bunch mode 0 (CBM0) induced horizontal orbit motion inside the orbit feedback bandwidth, potentially affecting our ability to achieve beam stability goals. Longitudinal feedback kicker is not strong enough to damp CBM0 oscillations. We developed new beam-based feedback method to suppress CBM0 oscillations with low level RF phase as actuator. It uses existent FOFB framework with no changes to the feedback algorithm. Effectiveness of this method is verified using present APS operations lattice where synchrotron frequency is outside orbit feedback bandwidth*. In the present work, low alpha lattice is created to emulate APS-U setting where synchrotron frequency is inside the orbit feedback bandwidth. Experiments with this lattice successfully demonstrated CBM0 correction within FOFB bandwidth. Combined operation of orbit feedback and CBM0 correction is stable, and CBM0 oscillations are damped. We achieved better orbit motion suppression and corrector drive efforts are reduced as well. * P. Kallakuri et al., ’Coupled bunch mode zero correction using orbit measurements and RF system phase feedback’, doi:10.1103/PhysRevAccelBeams.25.082801 |
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Slides MO2C03 [1.326 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2C03 | ||
About • | Received ※ 14 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023 | ||
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MOP013 | Expansion of the MTCA Based Direct Sampling LLRF at MedAustron for Hadron Synchrotron Applications | pick-up, diagnostics, injection, hadron | 63 |
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The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility located in Lower Austria, which delivers proton and carbon ion beams for cancer treatments. Currently the facility treats over 400 patients per year and is expected to double this number in the future. Six years since the start of clinical operation, MedAustron is experiencing end-of-life issues concerning the digital Low Level RF components in the injector and the synchrotron. Replacements for these applications are under development and the chosen hardware is suitable to also update multiple beam diagnostic devices in the facility. Main targets for updates are the Schottky monitors, which were never properly integrated into the MedAustron Control system and the position pickup measurement system, which currently does not support turn by turn measurements. Comparison measurements with other state of the art diagnostic devices are ongoing to demonstrate the capabilities of the generic hardware. Furthermore, these measurements should show the increased usability and diagnostic potential compared to the legacy devices. | |||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP013 | ||
About • | Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023 | ||
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WEP002 | Study of Visible Synchrotron Radiation Monitor on SOLEIL Booster | booster, extraction, emittance, synchrotron-radiation | 331 |
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In the scope of SOLEIL II, the booster must also be upgraded to reduce from 130 to 5~nm.rad the emittance of the beam delivered to the ring. Control of the emittance in the booster will become crucial to ensure the nominal performance of the storage ring injection. The SOLEIL I booster is already equipped with a Visible Synchrotron Radiation Monitor (MRSV). This equipment, made of an extraction mirror and a simple optical system, was originally planned to be used only for beam presence verification but has not been used routinely for operation since the commissioning in 2005. The control and acquisition systems had to be refreshed to be usable again and allow the beam size measurement along the booster energy ramp. The extraction mirror was replaced due to unexpected degradation leading to a second spot appearing on the camera. This paper traces back the MRSV upgrades from understanding the cause of mirror degradation until mirror replacement and the first proper beam visualisation, achieved at the beginning of 2023. | |||
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Poster WEP002 [1.550 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP002 | ||
About • | Received ※ 04 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 16 September 2023 | ||
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WEP005 | Effect of Incoherent Depth of Field for Bean Halo Measurement with the Coronagraph in SuperKEKB | simulation, optics, radiation, synchrotron-radiation | 335 |
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The incoherent depth-of-field due to the instantaneous opening angle of dipole SR will reduce the spatial coherence of SR in horizontal direction in the beam size measurement by using interferometry. This reduction of spatial coherence is due to both of apparent change of the beam profile due to field depth and intensity distribution in the aperture. In the case of beam profile measurement by imaging system, observed beam profile will deform and produce a beam tail in asymmetric manner by this effect. This apparent change of beam profile, especially extra beam tail in one side has certain influence for beam halo measurement using the coronagraph, because it has a large dynamic range of 6 order magnitude. Since the magnitude of asymmetric tail is proportional to bending radius, this effect is larger in large high energy physics machine which has a long bending radius. This effect is theoretically studied and compare with coronagraph measurement result of beam halo in the SuperKEKB. As a conclusion, this effect is very small and not observable in the coronagraph measurement at SuperKEKB. | |||
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Poster WEP005 [0.570 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP005 | ||
About • | Received ※ 05 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 21 September 2023 | ||
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WEP015 | Synchrotron Light Monitor for the Advanced Photon Source Booster Synchrotron | booster, photon, electron, synchrotron-radiation | 358 |
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Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. A new synchrotron light monitor has been tested for the booster synchrotron of the Advanced Photon Source. Visible light synchrotron radiation is collected by a mirror on a path tangential to the electron beam orbit, and directed to an optical imaging system and camera. This is planned to be a non-intercepting, transverse beam-size monitor even with the higher stored beam charges (~17 nC) needed for the Advanced Photon Source Upgrade. In the present work, we describe the present synchrotron radiation diagnostic layout. An analysis of the synchrotron radiation power on the mirror, the optical layout with components, and features of the control system will be presented. |
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Poster WEP015 [1.148 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP015 | ||
About • | Received ※ 09 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023 | ||
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WEP016 | Beamline for Time Domain Photon Diagnostics at the Advanced Photon Source Upgrade | photon, diagnostics, synchrotron-radiation, radiation | 363 |
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Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Time domain photon diagnostics are proposed for electron beam characterisation and operation of the Advanced Photon Source Upgrade storage ring. In the present work, we present updated status on the time-domain X-ray and visible photon diagnostic beamline for the Advanced Photon Source Upgrade. We outline design influences leading to the proposed beamline layout, in particular long-term maintenance and commonality with other beamlines at the Advanced Photon Source. |
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Poster WEP016 [0.812 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP016 | ||
About • | Received ※ 10 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023 | ||
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WEP020 | Performance Evaluation of GAGG+ and Tungsten Carbide Blades in an X-ray Pinhole Camera | photon, diagnostics, synchrotron-radiation, radiation | 382 |
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At Diamond Light Source two X-ray pinhole cameras are used to measure the transverse profile of the 3 GeV electron beam. The current pinhole assembly is formed using tungsten blades with chemically etched shims to produce a 25 µm x 25 µm aperture and the imager incorporates a 0.2 mm LuAG:Ce scintillator. Tungsten carbide is a machinable high-Z material which at millimetre thicknesses is opaque to X-rays. With a slight change in pinhole design, similar to that already in place at the ESRF, tungsten carbide blades could offer a well-controlled aperture size for the pinhole camera with simpler assembly. Further to this, improvements to the photon yield of scintillators mean that the new scintillator GAGG+ has an almost two fold increase in yield compared to the current LuAG: Ce scintillator. An evaluation of the tungsten carbide blades and GAGG+ scintillator is presented. | |||
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Poster WEP020 [0.468 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP020 | ||
About • | Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 24 September 2023 | ||
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WEP021 | 100Hz X-ray Beam Profile Measurements from a Transmissive CVD Diamond Detector | detector, experiment, focusing, photon | 387 |
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A non-destructive CVD diamond X-ray beam imaging monitor has been developed for synchrotron beamlines. The device can be permanently installed in the X-ray beam path and is capable of transmissively imaging the beam profile at 100 frames per second. The response of this transmissive detector at this imaging rate is compared to synchronously acquired images using a destructive fluorescent screen. It is shown that beam position, size, and intensity measurements can be obtained with minimal disturbance to the transmitted X-ray beam. This functionality is beneficial to synchrotron beamlines as it enables them to monitor the X-ray beam focal size and position in real-time, during user experiments. This is a key enabling technology that would enable live beam size feedback, keeping the beamline’s focusing optics optimised at all times. Ground vibrations (10-20Hz) can cause movement of focusing optics and beamline mirrors, which disturb the X-ray beam and reduce the ultimate quality of the sample-point beam. This instrument can detect this beam motion, enabling the source to be more easily determined and mitigations to be put in place. | |||
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Poster WEP021 [1.842 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP021 | ||
About • | Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 02 October 2023 | ||
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WEP034 | Effect of Longitudinal Beam-Coupling Impedance on the Schottky Spectrum of Bunched Beams | impedance, simulation, coupling, proton | 428 |
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Schottky spectra can be strongly affected by collective effects, in particular those arising from beam-coupling impedance when a large number of bunch charges are involved. In such conditions, the direct interpretation of the measured spectra becomes difficult, which prevents the extraction of beam and machine parameters in the same way as is usually done for lower bunch charges. Since no theory is yet directly applicable to predict the impact of impedance on such spectra, we use here time-domain, macro-particle simulations and apply a semi-analytical method to compute the Schottky spectrum for various machine and beam conditions, such as the ones found at the Large Hadron Collider. A simple longitudinal resonator-like impedance model is introduced in the simulations and its effect studied in different configurations, allowing preliminary interpretations of the impact of longitudinal impedance on Schottky spectra. | |||
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Poster WEP034 [1.237 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP034 | ||
About • | Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 22 September 2023 | ||
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WEP035 | Statistical Properties of Schottky Spectra | simulation, betatron, dipole, diagnostics | 433 |
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Schottky signals are used for non-invasive beam diagnostics as they contain information on various beam and machine parameters. The instantaneous Schottky signal is, however, only a single realisation of a random process, implicitly depending on the discrete distribution of synchrotron and betatron amplitudes and phases among the particles. To estimate the expected value of the Schottky power spectrum, and reveal the inner structure of the Bessel satellites described by the theory, the averaging of instantaneous Schottky spectra is required. This study describes this procedure quantitatively by analysing the statistical properties of the Schottky signals, including the expected value and variance of Schottky power spectra. Furthermore, we investigate how these quantities evolve with the number of particles in the bunch, the observed harmonic of the revolution frequency, the distribution of synchrotron oscillation amplitudes, and the bunch profile. The theoretical findings are compared against macro-particle simulations as well as Monte Carlo computations. | |||
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Poster WEP035 [3.908 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP035 | ||
About • | Received ※ 05 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023 | ||
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TH2C03 | Analysis of the Transverse Schottky Signals in the LHC | betatron, diagnostics, octupole, impedance | 462 |
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Schottky-based diagnostics are remarkably useful tools for the non-invasive monitoring of hadron beam and machine characteristics such as the betatron tune and the chromaticity. In this contribution recent developments in the analysis of the transverse Schottky signals measured at the Large Hadron Collider will be reported. A fitting-based technique, where the measured spectra are iteratively compared with theoretical predictions, will be presented and benchmarked with respect to the previously known methods and alternative diagnostic. | |||
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Slides TH2C03 [4.054 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TH2C03 | ||
About • | Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 19 September 2023 | ||
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