نتایج جستجو برای: beta beam
تعداد نتایج: 299514 فیلتر نتایج به سال:
DESIGN OF A FREQUENCY-DOUBLED 423 nm LASER FOR USE IN A CALCIUM INTERFEROMETER Jeremiah Birrell Department of Physics and Astronomy Bachelor of Science In this thesis I determine the optimal parameters for maximizing second harmonic generation of 423 nm light for use in an atom interferometer. The analysis is done using the nonlinear crystal Beta Barium Borate. Both critical and noncritical pha...
The efficient production of short pulses of radioactive ion beams is a key point of the long term CERN betabeam project. A strong R&D effort in the field of ion sources is required to reach this challenging objective. A summary of the pulsed beta-beam ion source specification is proposed. A discussion follows on the ion source technologies suitable for this demanding project. The proposed solut...
The distributionof reactive and resistive components of the transverse impedance around the circumference of LEP has been obtained by exciting the beam and measuring the variationsof phase advance and of closed orbit displacements with beam current. Tune shifts with current and instability thresholds were determined for two machine lattices with different beta functions and momentum compaction ...
Beam energy deposited in Higher-Order-Modes may affect both beam stability and cryo power requirements of superconducting proton linacs like those which are objective of the CERN SPL study. We report on numerical studies of the high-beta cavity type, analyzing it's HOM spectrum. These especially include Q-factor estimations based on scattering spectra calculations and an improved pole-fitting a...
امروزه شهرها به عنوان یک سامانه، نیازمند مدیریت می باشند که به تعیین اهداف و برنامه پرداخته و فعالیت عناصر مختلف شهری را هماهنگ نماید. از این رو هدف اصلی در این پژوهش تعیین وضعیت مدیریت شهری در ساماندهی خدمات شهری منطقه 5 شهر کرمانشاه می باشد. روش پژوهش توصیفی- تحلیلی است و نحوه جمع آوری اطلاعات به صورت پیمایشی و استفاده از پرسشنامه محقق ساخته بوده که براساس فرمول کوکران حجم نمونه 320 نفر محاسب...
The ionization of residual gas by an electron beam in an accelerator generates ions that can resonantly couple to the beam through a wave propagating in the beam-ion system. The original theory of the Fast Ion Instability [1, 2] was developed assuming both a constant external focusing and the beam size. The theory predicts an instability in which an initial perturbation grows as ∼ exp(α√t). In ...
Parameters have been studied for a high luminosity e+ecollider operating at the Upsilon 4S that would deliver a luminosity of 1 to 4 x 10/cm/s. This collider, called a Super-B Factory, would use a combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in lowemittance damping rings similar to those designed for a Linear Collider...
There is currently interest in simple models for molecular-beam epitaxy (MBE) which mimic the effect of thermal mobility by allowing immediate incorporation of deposited atoms at kink sites within a distance l of the deposition site. Scaling of the interface width, W, with mean film height, [h], of the form W approximately [h]beta, is analysed. Studies for a solid-on-solid geometry in d = 1 + 1...
The lattice for the present design of the TESLA Linear Collider with integrated X-Ray Laser Facility is basically a FODO structure with constant beta-function. There are more than 800 individually powered superconducting quadrupoles to focus the beam in the two main linear accelerators (each with a length of 15 km). For the availability of the beams it is important that a power supply failure o...
The next generation of long baseline neutrino experiments will aim at determining the value of the unknown mixing angle, θ13, the type of neutrino mass hierarchy and the presence of CPviolation in the lepton sector. Beta-beams and electron capture experiments have been studied as viable candidates for long baseline experiments. They use a very clean electron neutrino beam from the β-decays or e...
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