Subjects -> PHYSICS (Total: 857 journals)     - ELECTRICITY AND MAGNETISM (10 journals)    - MECHANICS (22 journals)    - NUCLEAR PHYSICS (53 journals)    - OPTICS (92 journals)    - PHYSICS (625 journals)    - SOUND (25 journals)    - THERMODYNAMICS (30 journals) NUCLEAR PHYSICS (53 journals)
 Showing 1 - 50 of 50 Journals sorted alphabetically Advances in Optics and Photonics       (Followers: 18) Annual Review of Nuclear and Particle Science       (Followers: 1) APL Photonics Atomic Data and Nuclear Data Tables EPJ A - Hadrons and Nuclei EPJ B - Condensed Matter and Complex Systems       (Followers: 1) EPJ E - Soft Matter and Biological Physics       (Followers: 3) EPJ Nuclear Sciences & Technologies       (Followers: 3) EPL Europhysics Letters       (Followers: 8) Fusion Science and Technology       (Followers: 4) IEEE Nanotechnology Express       (Followers: 18) International Journal of Quantum Chemistry       (Followers: 5) Journal of Nanomedicine & Nanotechnology       (Followers: 2) Journal of Nuclear and Particle Physics       (Followers: 14) Journal of Nuclear Materials       (Followers: 12) Journal of Physics G : Nuclear and Particle Physics       (Followers: 16) Journal of Quantum Chemistry       (Followers: 1) Kerntechnik Nano Energy       (Followers: 11) NanoImpact Nanotechnology Development       (Followers: 21) Nanotechnology, Science and Applications       (Followers: 7) Nuclear and Particle Physics Proceedings       (Followers: 3) Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment       (Followers: 18) Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms       (Followers: 17) Nuclear Materials and Energy       (Followers: 1) Nuclear Physics A       (Followers: 5) Nuclear Physics B       (Followers: 3) Nuclear Physics News       (Followers: 2) Nuclear Science and Engineering       (Followers: 7) Nuclear Technology       (Followers: 5) Nukleonika Particles Physica E: Low-dimensional Systems and Nanostructures       (Followers: 1) Physica Medica       (Followers: 4) Physical Biology       (Followers: 4) Physical Review A       (Followers: 23) Physical Review Accelerators and Beams       (Followers: 4) Physical Review B       (Followers: 32) Physical Review D       (Followers: 12) Physical Review E       (Followers: 41) Physical Review Letters       (Followers: 162) Physics of Atomic Nuclei       (Followers: 10) Physics of Particles and Nuclei       (Followers: 2) Physics of Particles and Nuclei Letters       (Followers: 1) Progress in Particle and Nuclear Physics       (Followers: 2) Radiation Detection Technology and Methods       (Followers: 1) The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics       (Followers: 29) The European Physical Journal Special Topics       (Followers: 1) World Journal of Nuclear Science and Technology       (Followers: 4)
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 Radiation Detection Technology and MethodsNumber of Followers: 1      Hybrid journal (It can contain Open Access articles) ISSN (Print) 2509-9930 - ISSN (Online) 2509-9949 Published by Springer-Verlag  [2467 journals]
• Detector development at the Back-n white neutron source

Abstract: Purpose Back-n is a white neutron beamline at China spallation neutron source, which was established in the year of 2018. It is a powerful facility for nuclear data measurement, neutron detector calibration, and radiation effect research. Method A series of detectors were built for different experiments, including beam monitoring, beam profile measurement, neutron induced secondaries (fission fragments, light charged particles and gamma) cross section measurement, and neutron resonance radiography, etc. A common digitization electronics and a cluster-based DAQ were developed for these detector systems. Most detectors have been employed at Back-n and serviced for experiments from the beginning of the beamline running. Results and conclusion As an overview of detectors of Back-n, the details of the detector design and the experiment performing are described in this paper. Some developing systems, e.g., MTPC and B-MCP, are also included.
PubDate: 2023-01-13

• Optimization of dynamic aperture by using non-dominated sorting genetic
algorithm-II in a diffraction-limited storage ring with solenoids for
generating round beam

Abstract: Purpose Round beam, i.e., with equal horizontal and vertical emittance, is preferable than a horizontally flat one for some beamline applications in Diffraction-limited storage rings (DLSRs), for the purposes of reducing the number of photons getting discarded and better phase space match between photon and electron beam. Conventional methods of obtaining round beam inescapably results in a reduction of dynamic aperture (DA). In order to recover the DA as much as possible for improving the injection efficiency, the DA optimization by using Non-dominated sorting genetic algorithm-II (NSGA-II) to generate round beam, particularly to one of the designed lattice of the High Energy Photon Source (HEPS) storage ring, are presented. Method According to the general unconstrained model of NSGA-II, we modified the standard model by using parallel computing to optimize round beam lattices with errors, especially for a strong coupling, such as solenoid scheme. Results and conclusion The results of numerical tracking verify the correction of the theory framework of solenoids with fringe fields and demonstrates the feasibility on the HEPS storage ring with errors to operate in round beam mode after optimizing DA.
PubDate: 2023-01-12

• Comparison of the closed analytical solution on the parameters of the
alignment and surveying of the elements of accelerator under random errors

Abstract: Purpose Compared with the iterative approximation solution, the analytically rigorous solution of the parameters of the accelerator alignment and surveying is the closed theoretical solution. To make the calculated error meet the negligible principle, in this paper, such examples of the zero, small angle and small translation, only large translation and no angle, only large angle without translation and large translation and large angle parameters under random errors are constructed. Methods Furthermore, Singular Value Decomposition, Eigen Value Decomposition, Polar Decomposition, Orthogonal Procrustes Analysis, and Successive Equivalent Differences Transformation are compared. Results In all the above examples, the mutual calculation deviation of Singular Value Decomposition, Eigen Value Decomposition, Polar Decomposition, and Orthogonal Procrustes analysis methods is less than 10 um. Its calculation accuracy is the highest, and Successive Equivalent Differences Transformation-3 has the largest calculation error, and Successive Equivalent Differences Transformation-N is in the middle. The results show that the coordinate residuals, parameters offsets and point position errors of the above solutions with random errors are all nearly zero. Conclusion It shows that the closed analytical solution is a rigorous solution. Moreover, it also shows that the constructed method of the coordinate point pairs is correct.
PubDate: 2023-01-12

• Recent progress on imaging technology and performance testing of PET/MR

Abstract: Purpose Integrated positron emission tomography and magnetic resonance (PET/MR) is a multimodality imaging technology integrating PET and MR, which can reflect the anatomical structure and physiological function simultaneously. With the development of this technology, PET/MR plays an increasingly important role in clinical diagnosis and treatment. This review would demonstrate the current state of the latest advancement of PET/MR detection technology. Methods In this review, some studies of PET/MR detection technology in motion artifact correction, time of flight, noise reduction, performance testing methods, and phantoms were summarized. Results and conclusions PET/MR is advancing rapidly in imaging technology and has achieved phased achievements. The performance testing results of different models prove that the integration of PET and MR does not affect the respective performance, and the performance testing phantom for PET/MR needs further development.
PubDate: 2023-01-12

• Studies of the linearity of the readout module assembling using the
eXTP-GPD chips

Abstract: Background The Gas Pixel Detector (GPD) is a key part of the Polarimetry Focusing Array (PFA) sub-system onboard the enhance X-ray Timing and Polarimetry mission (eXTP). The GPD can accurately provide the polarized angle and degree for incoming soft X-rays (requirements of minimum detectable polarization <1 $$\%$$ (10 $$^{6}$$ s, 1 mCrab)) from celestial objects under extreme conditions of density, gravity and magnetism. Purpose Paste the GPD chips on a matched ceramic package is one of the most important procedures for the GPD assembly, and the parallelism between the top surface of an ASIC chip and the bottom surface of a Gas Electron Multiplier (GEM) foil can have impact on the distribution of electric field within transfer region and reconstruction of photoelectric trajectories, resulting in deterioration of the GPD sensitivity. This study quantifies the influence and gives a reasonable expectation of the parallelism. Methods A simulation framework of the GPD is constructed to quantify the influence on the GPD performance and values of the parallelism are measured by a gauge with a position resolution of 0.1 $$\upmu \mathrm m$$ . Results: The difference of degree of modulation is less than 1 $$\%$$ comparing the parallelism with a value of 20 $$\upmu \mathrm m$$ to a value of 0 $$\upmu \mathrm m$$ in response to both polarized and unpolarized X-rays. Meanwhile, the value of parallelism can reach $$6.9 \pm 3.4 \upmu \mathrm m$$ ( $$0.0176^{\circ } \pm 0.0087^{\circ }$$ ) by testing and verifying. Conclusions The impact on the GPD performance can be less than 1 $$\%$$ as the parallelism with an order of 20 $$\upmu \mathrm m$$ , and we also give a reasonable measuring method and verify the controllability and feasibility of the parallelism with an order of 20 $$\upmu \mathrm m$$ for pasting the ASIC chip on the surface of a ceramic package.
PubDate: 2023-01-11

• Image reconstruction for the coded aperture system in nuclear safety and
security using a Monte Carlo-based system matrix

Abstract: Purpose Accurate localization of radioactive materials is critical to nuclear safety and nuclear security. A coded aperture imaging system provides a visualization solution. However, the correlation method has poor reconstruction performance for sources with low counts and for extended sources. Methods In this study, a Monte Carlo optimization-based MLEM algorithm (MC-MLEM) is proposed. The system matrix was obtained by accurate Monte Carlo simulation, so the physical effects such as mask penetration that affect the imaging process were taken into account in the MLEM algorithm. In the simulation process, the normalization of the system matrix was realized by controlling the source at different position of the source plane to have the same activity and emission angle. Results The experimental results showed that compared with the correlation method, the MC-MLEM algorithm could improve the signal-to-noise ratio and angular resolution and locate the source position quickly and accurately under low count conditions. Furthermore, the MC-MLEM algorithm could reconstruct the shape of the extended source and the expected activity ratio of cold-hot sources with large activity differences. Conclusion The MC-MLEM algorithm improved the imaging results and enhanced the reconstruction performance.
PubDate: 2023-01-11

• Study on temperature response of the HERD calorimeter cell

Abstract: Purpose To derive the temperature response of the basic unit of the electromagnetic calorimeter of the high energy cosmic-radiation detection (HERD) facility. Method Tested a method to measure HERD calorimeter cell (HCC) light yield using an ultraviolet Light-Emitting Diode with a wavelength of 300 nm, and established an experimental setup and tested the light yield of the HCC at different temperatures in a thermal chamber. Results and conclusions The result showed that the signal amplitudes variation of the HCC reached up to 10.2% with temperature ranging from 0 to 60 °C, if we narrow the temperature range to 0– 35 °C, the variation was about 3.7% and it showed much better linearity. This result provides a good instruction on the thermal control of the HERD calorimeter (CALO) to improve its performance.
PubDate: 2023-01-06

• Equilibrium electron beam parameters of the High Energy Photon Source

Abstract: Purpose The physics design of the High Energy Photon Source (HEPS) was finished after many times of iteration. Hereby, the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the baseline design of HEPS are presented. Methods To compute the equilibrium parameters of the electron beam, the lattice parameters, RF parameters, and the parameters of the insertion devices (IDs) were determined first. Furthermore, it is more precise to use the full-current electron beam parameters in the estimations of the performance of the synchrotron light. Therefore, not only the single-particle dynamics but also the current-dependent collective effects need to be considered in the computations of the full-current, equilibrium parameters of the electron beam. Both analytic computations and multi-particle tracking simulations were carried out. Results The full-current, equilibrium parameters of the electron beams in the HEPS storage ring are presented in this paper. Moreover, the main beam parameters in the injector (the booster and the LINAC), corresponding to the two baseline operation modes of the storage ring, are also presented. Conclusion The typical electron beam parameters corresponding to the two baseline operation modes are given in detail in this paper.
PubDate: 2023-01-02

• Simulation research on cable-laying scheme of HIAF dipole power supply

Abstract: Background A strong electromagnetic force is the major cause of vibration in dipole power supply cables. Moreover, the long-term operation of cables under vibration conditions leads to structural fatigue failure. Purpose and methods To investigate the cable-laying scheme of a dipole power supply, a finite element model for the electromagnetic–structural coupling between cables and cleats was established. The electrodynamic forces were simulated for fixed-length cables in the horizontal, vertical, and bent models under pulse-current excitation. Subsequently, based on the optimized arrangement mode, the deformation of the cables and the stresses of the cleats were obtained. Results A small cable electrodynamic force was observed in the positive–negative interlace arrangement, and the cable deformation was caused by electrodynamic forces. The maximum cleat deformation occurred at the position with the largest electrodynamic force, where the cleats were reinforced. Moreover, the mechanical characteristics of the cables and cleats under pulse-current excitation are described intuitively and quantitatively, providing theoretical support for the cable-laying scheme of the dipole power supply.
PubDate: 2022-12-26

• Experimental study of channel electron multiplier

Abstract: Background Channel electron multiplier (CEM) can be used to measure extremely few charged particles, such as electrons and ions. The CEM is widely used in particle detection, so it is very important to study their performance parameters. Purposes Test and analyze the performance parameters of the CEM, such as resistance, gain, and pulse output for a single entrance photoelectron. Methods The heated tantalum filament is used as a stable and adjustable planar electron source to test the performance of the CEM in the analog mode. The performance parameters of the CEM in the pulse counting mode are tested by using the ultraviolet LED to excite the gold photocathode to generate a single photoelectron. Results and conclusions The gain of the CEM in the analog mode can reach more than 106 and the gain in the pulse counting mode can be two orders of magnitude higher. The curved helical channel has a greater advantage than the ordinary straight channel, which is conducive to weakening the ion feedback phenomenon.
PubDate: 2022-12-24

• The design of accelerator control network analysis system and its
application

Abstract: Purpose The control network, which is a crucial component of the contemporary accelerator control system, connects all servers, workstations, PCs, and instruments at each station to exchange data and share resources. The security and reliability of the network directly affect the operating efficiency of the control system. It is essential to know the technology of packet capture, monitoring, and analysis in order to maintain the accelerator control network's healthy, safe, and dependable functioning. Methods In this article, IMPCAS NetAnalyzer, a novel and general accelerator control network analysis system, is developed using object-oriented C# language, multi-threading technology, as well as the SharpPcap link-layer network access packet capture and filtering engine. Results This system can capture and thoroughly analyze control network protocols, particularly the CA and PVA protocols in EPICS. It summarizes the status of the IOC server along with PV access data. Simultaneously, by importing its IP address information, any accelerator device may generate real-time alarms for irregular access IP. This enables regular accelerator individuals to quickly understand the network's operational status. Conclusion Finally, the system has been tested and validated on two heavy ion accelerator research facilities, SESRI (the Practical Application in Space Environment Simulation and Research Infrastructure) and HIRFL (the Heavy Ion Research Facility in Lanzhou). The results indicate that it achieves the desired aims and serves as a solid foundation for future version development. Graphical
PubDate: 2022-12-17

• Development of corrector magnet power supply for high energy photon source

Abstract: Purpose High Energy Photon Source (HEPS) requires high quality, high energy beam and ultra-low emittance of 0.1 nm·rad, which puts forward high demand for power supply. In this paper, a high-performance corrector magnet power supply is developed to calibrate and adjust beam track within a certain bandwidth range to ensure the stability of beam track. Methods The prototype of power supply adopts the new "One control Two" control mode, which adjusts the performance of two power supplies simultaneously based on digital control. Results The experimental results show that the stability of the power supply is lower than 20 ppm, which is far better than the design index. Voltage ripple is less than 10 mV, and other performance indexes meet the physical design requirements, which can well meet the requirements of HEPS construction. Conclusions After a lot of experiments and tests, all the parameters passed the design indicators. The successful development of this power supply has laid a foundation for the successful application of HEPS.
PubDate: 2022-12-01
DOI: 10.1007/s41605-022-00346-0

• Investigation of spin rotators in CEPC at the Z-pole

Abstract: Purpose Longitudinal polarization is an important design aspect of the future 100 km-scale Circular Electron Position Collider (CEPC). Spin rotators are needed in the CEPC collider rings to make the beam polarization along the longitudinal direction at the interaction points (IPs). This paper focuses on the design of spin rotators for CEPC at the Z-pole (45.6 GeV). Methods The design of spin rotators in the CEPC at the Z-pole is based on solenoid magnets and horizontal bending magnets sections. The coupling of transverse motion introduced by solenoids is compensated with quadrupole lenses. Adjustments have been made to the layout to implement the spin rotators into the collider rings. Results Longitudinal polarized beam can be achieved at the IPs with the spin rotators. High degree of polarization is attainable, while the effect of spin rotators on orbital motion is acceptable. The detailed simulation results will be presented. Conclusion A solenoid-based spin rotator configuration is designed and integrated into the CEPC collider ring lattice. According to the simulation results, the polarization requirements can be satisfied.
PubDate: 2022-12-01
DOI: 10.1007/s41605-022-00344-2

• A prototype segmented planar high purity germanium detector using
wraparound lithium diffusion electrode and amorphous germanium blocking
contact

Abstract: Purpose Segmented high purity germanium (HPGe) detectors have been used in many experiments to measure the position and energy deposition of gamma ray interactions. Significant efforts have been made to optimize the design and simplify the fabrication process. Amorphous germanium (aGe) coating is a desirable method to realize blocking contact and facilitate the segmentation. Method In this study, a prototype segmented planar HPGe detector is fabricated using a wraparound lithium diffusion electrode for bias voltage applying and reliable mechanical mounting. A low leakage current design is realized based on conventional chemical polishing and aGe blocking. A guard ring (GR) is used to protect the metal strip electrodes within it from the surface leakage current. The GR and strip electrodes are coated onto the aGe layer. A multichannel charge sensitive preamplifier is connected to the strip electrodes, and the signal waveforms are digitized using a multichannel 100 MS/s analog-to-digital converter. Results and conclusion The charge collection time and amplitude are analyzed. An average energy resolution of 2 keV (full width at half maximum, FWHM) is realized at 662 keV. Charge collection is simulated via a Monte Carlo program. The spatial resolution is also estimated using the program. The front-end response and measured noise level are considered. According to the simulation results, sub-millimeter (FWHM at 122 keV) resolution can be achieved at the current noise level.
PubDate: 2022-12-01
DOI: 10.1007/s41605-022-00349-x

• A new multi-turn beam dump scheme design and simulation for HIAF-BRing
machine protection

Abstract: Purpose To protect accelerator devices from being damaged by high-power beam, a new beam dump system is under design for HIAF-BRing. Method Based on the optical characteristics, unwanted particles are safely deflected to a specific internal absorber through a local bump orbit generated by active-discharging magnets, which is achieved by paralleling a bleeder resistor of 600 m $$\Omega$$ to two of dipole magnet power supplies. Results Taking alignment and multipole field errors into account, discarded beam can be dumped within 5 ms with an efficiency of more than 99.8% at any operation stage. Conclusion The proposed beam dump solution satisfies the machine protection requirements for BRing and can provide a new idea for similar facilities.
PubDate: 2022-10-21
DOI: 10.1007/s41605-022-00353-1

• Neon venting of activated NEG-coated beam pipes in IHEP

Abstract: Background In High Energy Photon Source (HEPS) the beam vacuum pipes employ TiZrVHf non-evaporable getter (NEG) coatings in order to meet the operation requirements. In many occasions it is inevitable to bring the sectors to atmosphere in order to open detectors, insert or change faulty parts. Consequently, NEG coatings will be saturated and followed with activation to restore the vacuum. Such an intervention would require heating up the whole sector to hundreds of degree and last from 2 to 4 weeks. Purpose Therefore, a Neon venting system is developed in HEPS in order to perform fast interventions without losing much of the performance of the activated NEG coating. Methods Preliminary experiments has been carried out to test the venting with Neon of different purity by comparing pumping speed lost and vacuum recovery before and after Neon venting. Results Results show that Neon with ultrahigh purity (purified by NEG cartridge purifier) could preserve full pumping performance of the NEG coated pipes. Neon with 6 N purity could preserve half pumping performance of the NEG coated pipes, but vacuum could be fully restored in only 2 days. Neon with 5 N purity could saturate the NEG coated pipes, leading to full pumping performance lost. Therefore, Neon with 6 N purity or above is promising in applications of efficient operations in HEPS.
PubDate: 2022-10-15
DOI: 10.1007/s41605-022-00358-w

• Artifact analysis of a far-field coded-aperture gamma camera extended to
partially coded field-of-view

Abstract: Purpose Coded-aperture gamma cameras play an important role for homeland security nowadays. They have limited field-of-view (FOV) which is a critical parameter for many applications. The FOV can be potentially increased by extending it to the penumbra area (partially coded FOV). Methods In this study, we analyzed this artifact phenomenon based on simulating a commercial coded-aperture gamma camera. The camera uses a modified uniformly redundant array (MURA) mask with a basic pattern of rank 11. Its opening angle of the basic pattern to the detector center is 26.36 $$^\circ$$ which is the commonly used non-artifact FOV (NAFOV). In some applications, the radiation source is a far-field single-point source. Thus, we extend its FOV to 40 $$^\circ$$ by including a part of the partially coded area, which is a trade-off between the FOV and image quality. Analytical calculations and simulation studies were carried out. The system matrix was calculated using the Sidden’s algorithm. The maximum likelihood expectation maximization (MLEM) reconstruction method was employed. Projections and reconstruction results of the point source at different positions were compared. The second moment of inertia was used as the figure of merit. Results Results show that projections have periodic similarity with a period of NAFOV, and reconstructions also have periodic artifacts, i.e., from $$\theta$$ to $$\theta$$ +NAFOV. Artifacts are the most serious at the edge of the NAFOV. The upper and lower artifacts are more serious than the left and right artifacts due to the difference between the horizontal centerline (tungsten) and vertical centerline (holes expect the center unit) of the mask. Conclusions For a point source with high activity, artifacts can be reduced by increasing the iteration number of the MLEM reconstruction. Even at the edge of NAFOV, the point source can be possibly reconstructed thanks to the large size of the position sensitive detector (PSD) used. The noise will significantly increase artifacts, which may lead to error locate the point source with low activity at some specific positions.
PubDate: 2022-10-02
DOI: 10.1007/s41605-022-00355-z

• A slow orbit feedback algorithm based on expanded response matrix for SSRF
storage ring

Abstract: Background Most of the global orbit feedback algorithms in storage rings are based on response matrix (RM) singular value decomposition method. Commonly, the RM is the orbit distortion along the ring responding to the steering magnet changes. For those methods RF frequency feedback is in a separated process. Methods and Results In this paper, the response matrix is expanded to the orbit distortion caused by the RF frequency variation. With this expanded RM, the orbit correction via steering magnet changes and RF frequency adjustment can be accomplished in one step. The commissioning results are carried out  showing that the algorithm works stably.
PubDate: 2022-09-15
DOI: 10.1007/s41605-022-00352-2

• Research on error accumulation control of three-dimensional adjustment
with offset constraint

Abstract: Background Currently, laser tracker is the primary instrument used to carry out three-dimensional position measurement in accelerator alignment. Theoretically, three-dimensional measuring data processed by three-dimensional adjustment are more rigorous, however, error accumulation is found in practice. Purpose In order to control error accumulation and further improve the measurement accuracy of accelerator alignment, this research introduces the laser alignment system into the activity of measurement and data processing. Methods A measurement scheme combining laser tracker and laser alignment system is proposed. To construct the constraint condition, the offset values from the measuring points to the laser straight-line datum were used. To carry out the three-dimensional adjustment with offset constraint, the laser tracker observations were used. Results A three-dimensional adjustment function model of laser tracker observations is given. The construction method of the constraint equation is researched, and the calculation formulas of the three-dimensional adjustment with offset constraint are derived. A 200 m linac tunnel control network is designed, using simulation measurement method, the measuring data of laser tracker and the offset values from the measuring points to the laser straight-line datum were generated. The simulated data are calculated by the method given in this paper and the result is analyzed. Conclusion Simulation result shows introducing the laser alignment system into laser tracker measurement and applying the three-dimensional adjustment with offset constraint can effectively suppress the error accumulation caused by long distance move station measurement.
PubDate: 2022-09-01
DOI: 10.1007/s41605-022-00350-4

• Study on the influence of base plate deformation on long undulators

Abstract: Background Nineteen undulators of various types are being fabricated for high-energy photon source (HEPS). In order to ensure the optical performance of the undulators, the girder deformation is usually carefully optimized during the structural design stage. Purpose Optimization of magnet girder deformation is one of the key points to ensure undulator magnetic field performance. To reduce magnet girder deformation, base plate, feet and strong back should be designed carefully. In the HEPS undulator design and manufacturing stage, it is found that under special circumstances, such as after the height of the feet is adjusted, or after the undulator is lifted to other place, the base plate and girder may deform more than expected. Methods Therefore based on ANSYS simulation and experimental test results, the factors causing the deformation of the girders are carefully analyzed. Base plate and feet were optimized for different types of undulators to avoid girder deformation. Related simulation and laser tracker measurement were performed to find out the reason in this paper. Results and conclusion Results show that the base plate of C-frame undulators will collapse and deform under the action of magnetic force. Asymmetric sagged base plate is the main reason of girder deformation. Increasing the thickness of the base plate and increasing the number of feet can both reduce that deformation. Optimization of magnet girder deformation is one of the key points to ensure undulator magnetic field performance. To reduce magnet girder deformation, base plate, feet and strong back should be designed carefully.
PubDate: 2022-09-01
DOI: 10.1007/s41605-022-00348-y

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