594 research outputs found
Stephane Mallarme: A synthesis of romanticism and parnassianism, 1970
No full textThe purpose of this paper is to analyse works of Stephane Mallarme, father of Symbolism, pointing out romantic and parnassian elements. Symbolism, like Romanticism, attempted to express the interior thoughts of man. The symbolist movement then, was not only a revolt against Parnassianism but also a return to Romanticism. On the other hand, one would not be incorrect in saying that Romanticism reached its culmination in the works of the symbolists poets. For this reason, an attempt will be made to show that the works of Mallarme, father of Symbolism, can be considered as a synthesis of Romanticism and Parnassianism. This thesis contains three chapters. The first chapter is devoted to a discussion of Romanticism and of Parnassianism. Special attention is given to the origin, development, characteristics and influences of each school. The relationship of one School with the other is also pointed out. The second chapter consists of a biographical sketch of Stephane Mallarme. Special emphasis is placed on factors and events in his life which may have influenced or determined the elements of Romanticism and Parnassianism in his poetry. The third chapter is devoted to an analysis of some of the poems of Stephane Mallarme", "Les Fenetres," V Apparition," "L'Azur," "Toast Funebre," "Le Vierge," "L'Apres-Midi d'un Faune." In these analyses special attention is given to the romantic and parnassian tendencies of the poems. Since these romantic-parnaassian elements occur frequently throughout his works, it has been concluded that Mallarme's poetry can be considered as a synthesis of the two poetic schools
Obama's visit to Korea : an unwavering US-ROC alliance amidst regional tensions
No full textFor more about the East-West Center, see http://www.eastwestcenter.org/Stephane Mot, Independent Author and Blogger living in Seoul, explains that "Obama's visit did not change the opinion of the vast majority of South Koreans who consider the US-ROK alliance to be unequal, but it did further confirm the importance of South Korea for US engagement towards Asia.
The Right Optics Concept for the Right Dimension of the High Luminosity LHC Project
No full textWhile the LHC optics is approaching its limit in terms of beta*, not only bounded, somehow in relative, by the aperture of the existing inner triplets, but also, in absolute, by the match-ability, the flexibility and, at some point (not yet reached) the chromatic aberrations of the corresponding collision optics, the High Luminosity LHC project requests to triple or even quadruple this effort in order to meet the challenging performance target of 250 1/fb per year. This exigency, or even only half of it, cannot be satisfied without a complete change of point of view in the way low-beta* optics are thought and realized. After a long introduction presenting the main objectives and strategies of the HL-LHC project, this article will summarize the standard squeezing optics techniques and chromatic correction strategy presently used in the LHC, and will remind the main optics limitations resulting in this context. Identified a few years ago in the framework of the former upgrade project, these limitations then led to the establishment of the Achromatic Telescopic Squeezing scheme as a key solution to the various issues, which has been a formidable background for the overall HiLumi Design Study, and stays an in-built feature of the baseline HL-LHC configuration and of any of its possible variants
Impact and possible mitigation measures in case of failure of lattice sextupole and octupole circuits in Run 3
No full textDepending on the machine configuration which is used in operation, the failure of some lattice sextupole and octupole circuits might have a substantial impact on the machine performance (β∗ and beam brightness limitations). This paper analyzes the overall situation and gives some guidelines for Run 3 in case of un- availability of some of the above-mentioned corrector circuits
Optimal LHC optics phasing conditions for long-range beam-beam compensation and flat optics
No full textThis note describes a new possible phasing configuration for the (HL-)LHC optics, in order to further reduce the minimum allowed distance of beam-beam wire compensators with respect to the beam. Some functional target specifications for these wires are also derived in terms of diameter, current, and minimum position with respect to the beam
Long-range beam-beam mitigation for round optics
No full textWhen colliding high intensity bunch trains at low beta*, a sufficiently large crossing angle needs to be imposed at the interaction point (IP) in order to separate the two beams before and after the collision, and mitigate the so-called long-range beam-beam (BBLR) effect, which otherwise can be very detrimental to the beam lifetime. This, in turn, can impact severely the performance of the collider, unless crab-cavities for restoring the geometric overlap of the bunches at the collision point are part of the design (which is the strategic choice made by the HL-LHC project), and/or active beam-beam compensation schemes are put in place. The grail of such a scheme is based on DC current wires (one per beam per IP side), which should be ideally inserted at a rather small normalized transverse distance from the beam, which scales with the targeted normalized crossing angle, typically 8 beam sigma (for one of the two wires) when the targeted normalized crossing angle is 9.5 sigma. This ideal distance is however, deeper or much deeper, than the LHC or HL-LHC settings planned for the tertiary collimators (TCT). Since its early proposal in [1], the wire option was therefore known to be very challenging, if not incompatible, with the machine protection and collimation hierarchy. Purely numerical studies [2], however, recently showed that very good compromises could be found with quite relaxed wire settings, at least for round optics (i.e. with same beta* values in both transverse plane), and provided a net increase of the wire current. In this framework, this paper will elaborate a systematic and semi-analytical analysis of the pros and cons of this compromise, together with its limits and sensitivity to other optics parameters such as the beta-function aspect ratio at the wire location. One output of this study is the maximum allowed normalised gap for the TCTs (for round optics), such that the wires are not exposed to the tertiary halo while warranting their functionality in aggressive beam and optics conditions (preservation of the dynamic aperture at the level of 5.5 sigma up to a bunch population of 2.2e11 p/b with a normalised crossing angle as low as 9.5 sigma). The alternative of using pure octupole magnets, which would be installed near Q4, at sufficiently large beta-function and at an optimal beta-function aspect ratio, will also be discussed. While this option would strictly decouple the long-range beam-beam mitigation scheme from the collimation and machine protection sub-systems, it is shown to be less performing than the wire option for preserving the dynamic aperture with aggressive beam and optics parameters
Installation Strategy for the LHC Main Dipoles
No full textAll positions in the LHC machine are not equivalent in terms of beam requirements on the geometry and the field quality of the main dipoles. In the presence of slightly or strongly out-of tolerance magnets, a well-defined installation strategy will therefore contribute to preserve or even optimize the performance of the machine. Based on the present status of the production, we have anticipated a list of potential issues (geometry, transfer function, field direction and random b3) which, combined by order of priority, have been taken into account to define a simple but efficient installation algorithm for the LHC main dipoles. Its output is a prescription for installing the available dipoles in sequence while reducing to an absolute minimum the number of holes required by geometry or FQ issues
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