125862664
Dynamical Breaking of Supersymmetry and Its Restoration at High Temperatures
The dynamical breaking of the supersymmetric Higgs model is discussed without adding the Fayet—Iliopoulos term to the Lagrangian. It is shown, in terms of the Nambu—Jona-Lasinio mechanism, that the supersymmetry breaking can be realized dynamically in the supersymmetric Higgs model. The supersymmetry behavior at finite temperatures is also investigated and it is shown that the supersymmetry broken dynamically at zero temperature can be restored at finite temperatures.
123979917
A QCD Model Using Generalized Yang–Mills Theory
Generalized Yang–Mills theory has a covariant derivative, which contains both vector and scalar gauge bosons. Based on this theory, we construct a strong interaction model by using the group U(4). By using this U(4) generalized Yang–Mills model, we also obtain a gauge potential solution, which can be used to explain the asymptotic behavior and color confinement.
115467192
Dynamical breaking of supergauge symmetry and its restoration at high temperatures
The dynamical breaking of the supersymmetric Higgs model is discussed without adding the Fayet—Iliopoulos term to the Lagrangian. It is shown, in terms of the Nambu—Jona-Lasinio mechanism, that the supersymmetry breaking can be realized dynamically in the supersymmetric Higgs model. The supersymmetry behavior at finite temperatures is also investigated and it is shown that the supersymmetry broken dynamically at zero temperature can be restored at finite temperatures.
31915228
Diagnostics for the MLI Model 1.2-400 synchrotron light source
The MLI Model 1.2-400 synchrotron light source was designed for operation at 1.2 GeV at a beam current of 400 mA. An integrated set of diagnostics that meets the need of all stages of commissioning is required for this commercially produced storage ring. A diagnostics plan is included relating key system performance parameters to specific beam measurements, and to the particular diagnostic element for performing this measurement. The authors describe the design specifications of individual diagnostics in the transport line and storage ring and show how these designs are governed by the requirements established. Proceeding from the diagnostic plan, these diagnostics are sufficient for commissioning with minimal frills. A detailed description of the beam button position monitor electronics system in the ring is given.<<ETX>>
17295428
Influences of the magnetic coupling process on the spectrum of a disk covered by the corona
Context. Recently, much attention has been paid to the magnetic coupling (MC) process, which is supported by the very high emissivity indexes observed in Seyfert 1 galaxy MCG-6-30-15 and GBHC XTE J1650-500. But the rotational energy transferred from a black hole is simply assumed to be radiated away from the surrounding accretion disk in the black-body spectrum, which is obviously not consistent with the observed hard power-law X-ray spectra. Aims. We introduce a corona into the MC model to make it more compatible with observations. Methods. We describe the model and the procedure of a simplified Monte Carlo simulation, compare the output spectra in the cases with and without the MC effects, and discuss the influences of the three parameters involved in the MC process on the output spectra. Results. It is shown that the MC process augments radiation fluxes in the UV or X-ray band. The emergent spectrum is affected by the BH spin and magnetic field strength at the BH horizon, while it is almost unaffected by the radial profile of the magnetic field at the disk. Conclusions. Introducing corona into the MC model will improve the fitting of the output spectra from AGNs and GBHCs.
18270897
Beam Physics Highlights of the FERMI@ELETTRA Project
The electron beam dynamics in the Fermi Linac has been studied in the framework of the design of a singlepass free electron laser (FEL) based on a seeded harmonic cascade. The wakefields of some accelerating sections represent a challenge for the preservation of a small beam emittance and for achieving a small final energy spread. Various analytical techniques and tracking codes have been employed in order to minimize the quadratic and the cubic energy chirps in the longitudinal phase space, since they may cause a degradation of the fel bandwidth. As for the transverse motion, the beam breakup (BBU) instability has been recognized as the main source of emittance dilution; the simulations show the validity of local and non-local correction methods in order to counteract the typical “banana” shape distortion of the beam caused by the instability.
55642268
Simulation of magnetized beams
The angular momentums of particles in a bunch of beam are of importance in many applications. Usually the angular momentums are related to the end field of solenoids. In electron cooling facilities the solenoid fields are widely used as they are found very helpful not only in focusing and guiding the charge particle beams but also in enhancing the cooling rates. The RHIC electron cooler is a challenging project because it requires a high performance facility including a solenoid with high quality strong field (1 tesla). Issues caused by the end fields of the solenoid have been studied to minimize the extra temperature and coherent motions. In this paper we report recent results in simulating the angular momentums of the electron beam and its application on the RHIC electron cooler
54869476
OPTIMAL RF SYSTEMS FOR LIGHTLY LOADED SUPERCONDUCTING STRUCTURES
one meter cavity would therefore need to supply only 300 W to meet these demands. Recent developments in the field of RF accelerators have created a demand for power amplifiers that can support very high accelerating gradients, 15-25 MV/m, in superconducting structures with extremely low losses. Free electron lasers with modest beam current, I<10 uA, or those based on energy recovery linacs may have intrinsic power demands of less than 1 kW/m. We present a design concept for an amplifier and external tuner system that will efficiently meet this requirement. A likely amplifier for this application is the Inductive Output Tube (IOT) which offers high AC/RF efficiency, flexible power output and switching capability without the need for external modulation. The use of solid state amplifiers is also considered. The external tuner circuit makes use of low loss RF components, include waveguide, circulators and ferrite phase shifters to create a moderate quality standing wave between the amplifier and the superconducting cavity. The potential effective Qext exceeds 3×10 7 .