Insertion Devices
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Open Access
Abstract: This work presents the Opt-ID software developed by the Rosalind Franklin Institute (RFI) and Diamond Light Source (DLS) in collaboration with Helmholtz-Zentrum Berlin (HZB). Opt-ID allows for efficient simulation of synchrotron Insertion Devices (ID) and the B fields produced by a given arrangement of candidate magnets. It provides an optimization framework built on the Artificial Immune System (AIS) algorithm for swapping and adjusting magnets within an ID to observe how these changes would affect the magnetic field of a real-world device, guiding ID builders in the steps they should take during ID tuning. Code for Opt-ID is provided open-source under the Apache-2.0 License on Github: https://github.com/rosalindfranklininstitute/Opt-ID
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Dec 2022
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Insertion Devices
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Open Access
Abstract: The APPLE-Knot undulator has been proposed to reduce the large on-axis heat load of the APPLE-II at very low photon energy. However, the current designs have an inherent non-zero second field integral due to the Knot sections, resulting in a transverse deflection of the electron beam throughout the undulator. For a long device, such a deviation can degrade the brightness and power distribution of the outgoing beam. Here, a new end-Knot section is presented to compensate for the electron trajectory, and the undulator is symmetrized to balance the output power distribution. The performance of the APPLE-Knot with symmetric power distribution is investigated. The partial power, flux, and polarization are compared with the APPLE-II. In the linear mode, APPLE-Knot shows a pronounced reduction of the partial power, with a similar flux to the APPLE-II. The symmetric power density distribution reduces the hotspot by 41%, with a flux loss of less than 5%. In the circular mode and at low photon energies, the flux is limited by the phase error of the symmetric design.
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Sep 2022
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Insertion Devices
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Open Access
Abstract: The DIAMOND-II lattice is based on the ESRF-EBS cell, with the centre dipole replaced by a (chromatic) mid-straight, and a -I transformer, higher order achromat (HOA) & dispersion bumps to control the nonlinear dynamics. The majority of insertion devices currently on operation in Diamond will be either retained or upgraded as part of the Diamond-II program, and the new mid straights allow the total number of ID beamlines to be increased from 28 to 36.Therefore, it is important to investigate how IDs will affect the emittance, energy spread and linear and nonlinear beam dynamics. The kickmap approach has been used to model all IDs, including APPLE-II and APPLE-II Knot with active shim wires. In this paper, the outcome of these investigations will be presented and discussed.
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Jul 2022
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Insertion Devices
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Open Access
Abstract: When investigating the effect of insertion devices (IDs) on storage ring operations, it is not possible to simulate all of the large number of gap, phase and field settings that are available. This can be of particular concern for transient effects in IDs that are moved frequently, or APPLE-II devices which may use many different polarisation states. We therefore present measurements of the impact of selected IDs on various parameters in the current Diamond storage ring including orbit distortion, tunes, chromaticity and emittance, and assess the expected impact when applied to the Diamond-II lattice.
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Jun 2022
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Accelerator Physics
Insertion Devices
Magnets
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Open Access
Abstract: At Diamond Light Source we are considering an upgrade of the machine aimed at significantly reduced emittance (la factor 20), that follows a worldwide trend in similar synchrotron radiation sources. An important aspect in the design of the upgrade is the optimization of the photon beam properties, such as flux, brilliance, spot size, divergence or coherence of the new sources and how these are translated into requirements on the electron beam and on the machine design. We present a study based on a combination of accelerator physics tracking codes (AT, elegant) and of radiation codes (SPECTRA, SRW, SHADOW), with the aim at bridging the gap between machine and beamlines.
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Jun 2018
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I13-1-Coherence
Controls
Detectors
Insertion Devices
Magnets
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Open Access
Abstract: Synchrotron radiation provides a number of outstanding features
that are highly valuable for X-ray imaging and tomography. One of
them is the partial coherence of the radiation, which is explored at
the X-ray Imaging and Coherence beamline (I13) at Diamond Light
Source. The variety of methods employed at the beamline offer imaging with the highest quality. We discuss the benefi t of imaging with
coherent radiation and describe methods and applications available at Diamond’s I13 beamline.
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Sep 2017
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Insertion Devices
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Open Access
Abstract: Diamond Light Source is pioneering the move to a
Multi Bend Achromat storage ring lattice for low emittance
combined with the creation of new straight sections
available for Insertion Devices (ID). Diamond is at an
advanced stage of replacing one Double Bend Achromat
(DBA) cell of the existing storage ring with a Double
Double Bend Achromat (DDBA). The DDBA cell which
is to be installed in Autumn 2016 has 4 dipoles and has
been designed with a new straight section in the middle.
This allows ID radiation to shine down an existing Bending
Magnet port in the shield wall for a new micro-focus
protein crystallography beamline called VMX-m. This
same principle will be applied to the proposed Diamond
II project which will be based on a Double Triple Bend
Achromat with 6 dipoles per cell achieving even lower
emittance whilst providing many more IDs. This paper
describes the engineering challenges of these projects.
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Jun 2017
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Insertion Devices
RF
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Open Access
Abstract: The characterisation of the multi-bunch dynamics at the Diamond light source is performed with an advanced TMBF system that is capable of operating fast grow damp experiments thus allowing the exploration of many machine conditions. We report here the latest results of the measurement campaign, the implication on the machine impedance model and some of the intricacies of the analysis and interpretation of the experimental data.
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May 2017
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Insertion Devices
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Open Access
Abstract: Electron beam heating is a widely observed phenomenon at synchrotron facilities around the world, and has a large impact particularly on cryogenic insertion devices, but also on room temperature devices. This paper seeks to outline electron beam heating measurements taken at Diamond Light Source (DLS) and produces an empirical heat load relationship that matches the form of heating through the anomalous skin effect, although gives an order of magnitude higher than that predicted by theory. Resistive wall heating should vary inversely with the gap of installed cryogenic and permanent magnet insertion devices. This is also examined in this paper and the results presented.
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May 2017
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Electrical Engineering
Insertion Devices
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Open Access
Abstract: In planning the upgrade of one cell of the Diamond Storage Ring, the DDBA upgrade, it was evident that the electrical installation and commissioning would contribute a significant component of the overall installation time. Given the pressures to minimise the shutdown length, the electrical and instrumentation design was optimised for time effective installation and commissioning. This paper outlines the electrical and instrumentation design for DDBA; explores the installation time determining issues and how these were addressed; and reports on the lessons learnt from the actual installation and commissioning process.
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May 2017
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