ILC damping ring consists of very low emittance electron and positron storage rings. It is necessary for ILC damping ring to study electron cloud effects in such low emittance positron ring. We propose a low emittance operation of KEKB to study the effects.

We have constructed a new laser-Compton-scattering facility, called the LEPS2 beamline, at 8-GeV electron storage ring, SPring-8. This facility provides linearly polarized photon beam in tagged energy range of 1.3--2.4 GeV. Thanks to small divergence low-emittance storage-ring electrons, has size (sigma) suppressed about 4 mm even after it travels 130 m experimental building that is independent...

Rings are common in disk galaxies. These rings are either indistinguishable from a pair of tightly wound spirals, or themselves are a part of the spiral structure. Furthermore, their occurrence is seen coincident with a bar in the center. In this paper, we interpret this spiral-ring structure as density waves resonantly excited by a rotating bar potential. The theory gives excellent agreement f...

Particle loss due to the emission of single energetic beamstrahlung photons in beam collisions is shown to impose a fundamental limit on storage-ring luminosities at energies greater than 2E0 ∼ 140GeV for head-on collisions and 2E0 ∼ 40GeV for crab-waist collisions. Above these threshold energies, the suppression factor due to beamstrahlung scales as 1/E 0 , and for a fixed power of synchrotron...

In this paper, we analyze electric deflection fields for polar molecules in terms of a multipole expansion and derive a simple but rather insightful expression for the force on the molecules. Ideally, a deflection field exerts a strong, constant force in one direction, while the force in the other directions is zero. We show how, by a proper choice of the expansion coefficients, this ideal can ...

We investigate the isomerization enthalpy of the Dihydroazulene/Vinylheptafulvene (DHA/VHF) molecular photoswitch system derivatives using electronic structure calculation methods including Density Functional Theory (DFT), Quantum Monte Carlo (QMC) and Coupled Cluster (CCSD(T)). Recent efforts have focused on tuning the isomerization enthalpy of the photoswitch for solar thermal energy storage ...

DORIS first came into operation in 1973 as a double ring. Later on it was rebuilt as a single ring, and the maximum energy was increased from 3.5 GeV to 5.6 GeV. The experience with the double ring is briefly described, and that with the single ring in more detail. Emphasis is put on those topics which are important for the design of future storage ring colliders, DORIS II is also operating as ...