Nonevaporable getter (NEG) coating is widely required in the new generation of light sources and circular <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup></a:math> colliders for small vacuum pipes to improve level, which, however, also enhances high-frequency resistive-wall impedance often generates a resonator-like peak terahertz frequency region. In this paper, we will use...

Hybrid multibend achromat (MBA) lattice with a pair of dispersion bumps separated by <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo>−</a:mo><a:mi>I</a:mi></a:mrow></a:math> transformation is used in some diffraction-limited storage ring (DLSR) designs, which can obtain relatively large dynamic apertures. However, the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mo>−</c:mo><c:mi>I</c:mi></c:math> also largely restricts...

A compact damping ring with a limited circumference of about 160 m is proposed for producing kilowatt-level coherent EUV radiation. The electron bunch in the storage modulated by 257 nm wavelength seed laser help angular-dispersion-induced micro-bunching method (Feng and Zhao Sci Rep 7:4724, 2017), radiation at 13.5 an average power 2.5 kW can be achieved state-of-the-art accelerator technologies.

Dynamic aperture (DA) is an important nonlinear property of a storage ring lattice, which has dominant effect on beam injection efficiency and lifetime. Generally, minimizing both resonance driving terms (RDTs) amplitude dependent tune shifts essential condition for enlarging the DA. In this paper, we study correlation between fluctuation RDTs along longitudinal position DA area with double-bend multibend achromat lattices. The one RDT quantitatively represented by average at positions...

Due to scattering, particles in a ring may have large momentum deviations, which will change their dynamics, potentially resulting particle losses. Optimization of off-momentum nonlinear dynamics is, therefore, important for increasing beam lifetime. When analyzing using the approach resonance driving terms (RDTs), chromatic RDTs are usually used, denote deviations from on-momentum dynamics. In this paper, instead RDTs, we propose analyze is more direct way. As case include and...

In our previous study of bunch lengthening for the planned Hefei Advanced Light Facility (HALF) storage ring, a periodic transient beam loading effect was found in presence passive harmonic cavities some cases, which can dramatically affect as well stability [T. L. He et al., Bunch HALF ring cavities, Proceedings IPAC2021, Campinas, SP (JACoW, SP, Brazil, 2021), pp. 2082--2085, TUPAB265]. this paper, we continue to use an example, via both tracking simulation and semianalytical calculation,...

We propose a novel scheme for the calculation of bunch profiles and synchronous phase shifts arbitrary fill patterns in electron storage rings considering both effects passive harmonic cavity short range wakefield. This treats as charge distribution rather than point with form factor, divides voltage induced into two groups: that by previous passages present passage, where latter is integrated wakefield from all other vacuum components. An iteration loop computing profiles, including subloop...

We propose a novel algorithm to deal with the interaction of beam-cavity, which is convenient be implemented on platform matlab supporting graphics process unit operations and can significantly improve computational efficiency. Actually, this has been corresponding code named stable, used study longitudinal beam dynamics arbitrary filled bunches in electron storage rings. In paper, stable mainly evaluate bunch lengthening produced by passive higher harmonic cavity. first carry out efficiency...

The passive superconducting harmonic cavity (PSHC) scheme is adopted by several existing and future synchrotron light source storage rings, as it has a relatively smaller <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>R</a:mi><a:mo>/</a:mo><a:mi>Q</a:mi></a:math> larger quality factor (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>Q</c:mi></c:math>), which can effectively reduce the beam-loading effect suppress mode-one instability....

Abstract Diffraction-limited storage rings (DLSRs) have restricted dynamic apertures (DAs) due to their ultralow emittances and very strong nonlinearity. Off-energy multipole kicker injection (MKI) scheme, in which off-energy beam is injected onto the corresponding orbit, can reduce requirement of DAs. However, it requires relatively large energy acceptance high dispersion bumps. For a DLSR lattice with off-momentum DAs, be into DA but an additional offset from closed orbit increase total...

The combination of reversible angular dispersion-induced microbunching (ADM) and the rapid damping storage ring provides a storage-ring-based light source with capability to produce longitudinal coherent radiation high repetition rate. This paper presents prototype design for test facility based on study by Jiang et al. [ Sci. Rep. (2022), 12 , 3325]. modulation–demodulation section is inserted into long straight instead bypass line, which poses great challenges optimization nonlinear...

Abstract Generally, for a hybrid multi-bend-achromat (MBA) lattice with fixed linear optics, there is little potential to further optimize the nonlinear dynamics due limited free knobs. To obtain MBA better performance, it consider some indicators of as objective functions in designing optics using an optimization algorithm. In this paper, integral strengths sextupoles and natural chromaticities are used indicators, different methods both or either two carried out compared. As example, 7BA...

A higher harmonic cavity (HHC) is popularly employed in synchrotron light storage rings to enhance the machine performance, which requires its fundamental mode resonant frequency be tuned above radio-frequency harmonic. However, this detuning likely cause Robinson instability. In paper, we focus on a mode-zero instability driven by of passive superconducting (PSHC). This oscillates slightly below PSHC and was recently observed tracking simulations or experiments for several sources, but...

The hybrid multibend achromat (HMBA) lattice concept is adopted in some diffraction-limited storage ring designs, which can permit relatively large on-momentum dynamic aperture and weak sextupoles. In a typical HMBA lattice, the main arc section constrained by transverse phase advances making $\ensuremath{-}I$ transformation for sextupole cancellation. this paper, new with cancellation across straight proposed, where made between adjacent dispersion bumps of two cells. This makes free...

Abstract An interleaved sextupole scheme using a cross-cell betatron phase cancellation technique is adopted as candidate for future upgrade to the NSLS-II lattice. The upgraded lattice will use many installed magnets possible, including 30 dipoles, which create triple bend achromat configuration. A 300 pm-rad horizontal beam emittance has already been achieved with current can be further reduced around 200 damping wigglers. Some new design concepts used in modern 4 th -generation light...