481 research outputs found

    How to Commission, Operate and Maintain a Large Future Accelerator Complex from Far Remote

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    A study on future large accelerators [1] has considered a facility, which is designed, built and operated by a worldwide collaboration of equal partner institutions, and which is remote from most of these institutions. The full range of operation was considered including commi-ssioning, machine development, maintenance, trouble shooting and repair. Experience from existing accele-rators confirms that most of these activities are already performed 'remotely'. The large high-energy physics ex-periments and astronomy projects, already involve inter-national collaborations of distant institutions. Based on this experience, the prospects for a machine operated remotely from far sites are encouraging. Experts from each laboratory would remain at their home institution but continue to participate in the operation of the machine after construction. Experts are required to be on site only during initial commissioning and for par-ticularly difficult problems. Repairs require an on-site non-expert maintenance crew. Most of the interventions can be made without an expert and many of the rest resolved with remote assistance. There appears to be no technical obstacle to controlling an accelerator from a distance. The major challenge is to solve the complex management and communication problems.Comment: ICALEPCS 2001 abstract ID No. FRBI001 invited talk submitting author F. Willeke 5 pages, 1 figur

    CLIC e+e- Linear Collider Studies

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    This document provides input from the CLIC e+e- linear collider studies to the update process of the European Strategy for Particle Physics. It is submitted on behalf of the CLIC/CTF3 collaboration and the CLIC physics and detector study. It describes the exploration of fundamental questions in particle physics at the energy frontier with a future TeV-scale e+e- linear collider based on the Compact Linear Collider (CLIC) two-beam acceleration technique. A high-luminosity high-energy e+e- collider allows for the exploration of Standard Model physics, such as precise measurements of the Higgs, top and gauge sectors, as well as for a multitude of searches for New Physics, either through direct discovery or indirectly, via high-precision observables. Given the current state of knowledge, following the observation of a \sim125 GeV Higgs-like particle at the LHC, and pending further LHC results at 8 TeV and 14 TeV, a linear e+e- collider built and operated in centre-of-mass energy stages from a few-hundred GeV up to a few TeV will be an ideal physics exploration tool, complementing the LHC. Two example scenarios are presented for a CLIC accelerator built in three main stages of 500 GeV, 1.4 (1.5) TeV, and 3 TeV, together with the layout and performance of the experiments and accompanied by cost estimates. The resulting CLIC physics potential and measurement precisions are illustrated through detector simulations under realistic beam conditions.Comment: Submitted to the European Strategy Preparatory Grou

    The CLIC Programme: Towards a Staged e+e- Linear Collider Exploring the Terascale : CLIC Conceptual Design Report

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    This report describes the exploration of fundamental questions in particle physics at the energy frontier with a future TeV-scale e+e- linear collider based on the Compact Linear Collider (CLIC) two-beam acceleration technology. A high-luminosity high-energy e+e- collider allows for the exploration of Standard Model physics, such as precise measurements of the Higgs, top and gauge sectors, as well as for a multitude of searches for New Physics, either through direct discovery or indirectly, via high-precision observables. Given the current state of knowledge, following the observation of a 125 GeV Higgs-like particle at the LHC, and pending further LHC results at 8 TeV and 14 TeV, a linear e+e- collider built and operated in centre-of-mass energy stages from a few-hundred GeV up to a few TeV will be an ideal physics exploration tool, complementing the LHC. In this document, an overview of the physics potential of CLIC is given. Two example scenarios are presented for a CLIC accelerator built in three main stages of 500 GeV, 1.4 (1.5) TeV, and 3 TeV, together with operating schemes that will make full use of the machine capacity to explore the physics. The accelerator design, construction, and performance are presented, as well as the layout and performance of the experiments. The proposed staging example is accompanied by cost estimates of the accelerator and detectors and by estimates of operating parameters, such as power consumption. The resulting physics potential and measurement precisions are illustrated through detector simulations under realistic beam conditions.Comment: 84 pages, published as CERN Yellow Report https://cdsweb.cern.ch/record/147522

    Hepatoprotective Effect of the Aqueous Leaf Extract of Andrographis paniculata Nees Against Carbon Tetrachloride – Induced Hepatotoxicity in Rats

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    Hepatoprotective effect of the aqueous leaf extract of Andrographis paniculata was investigated against CCl4 – induced hepatic injury in rats. Significant (P<0.05) increase of serum levels of alanine aminotransferase (ALT), aspartate amino transferase (AST), alkaline phosphatase (ALP), total bilirubin (TBL), direct bilirubin (DBL), total cholesterol (CHL),  triglycerides (TG), low density lipoprotein (LDL), very low density lipoprotein (VLDL) and malondialdehyde (MDA) in CCl4 intoxicated rats were restored to normal levels when treated with the extract and CCl4. Significant (P<0.05) decrease of serum levels of total protein (TP), albumin (ALB), high density lipoprotein (HDL) and reduced glutathione (GSH) in CCl4 intoxicated rats were restored to normal levels when treated with the extract and CCl4. The LD50 of the leaf extract was greater than 3000 mg/kg. The study demonstrated that A. paniculata possesses significant hepatoprotective effects and may be the source of lead compound in the management of liver diseases.Key words: Hepatoprotective, Andrographis paniculata, Carbon Tetrachloride, Liver Disease

    値分布論と複素力学系を応用した函数方程式の研究

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    本課題は当初の研究計画に沿って遂行され、各計画課題を分担した研究者が得た実績の概要は以下である:・藤解は、ある形の複素微分方程式あるいは函数方程式等の解で与えられる平面上の有理型函数の値分布に関する既知の評価を精密化すると共に、そうした解の存在性について新しい知見を得た。また観測された現象が他分野とどのように関連しているかについて調べ、今後の更なる研究への着想を得た。・谷口は、整函数の力学系、特に構造有限な整函数の力学系を中心に調べ、粗み合わせ幾何学的な記述に成功した。またベル表現空欄や構造有限な整関数の変形空間の構造を明らかにし、さらに関連する被覆構造や力学系的構造について研究した。・下村は、Painleve超越関数についてその解の函数静的性質に関する研究を行ない、増大度を上からと下からそれぞれ精密に評価した。またPainleve超越函数PIVについてはsmall functionsに関する値分布を調べた。・諸澤は、既知の定義を一般化して半双曲型超越整函数や複素誤差函数を考察し、その力学系、特にジュリア集合、遊走領域およびベーカー領域の性質に関して新たな知見を得た。また、ある超越関数に広義一時収束する多項式列のファトウ集合の収束性に関する結果を得た。・石崎は、複素数平面上で有理型な函数を解として持つ様々な函数方程式について考察した。特に、線型差分方程式・q-差分方程式の有理型函数解の存在と、その増大度を中心に調べ精密な評価を導いた。その過程で、更なる応用が期待される新しい手法を開発した。・木坂は、整函数の力学系について研究し、Fatou成分が2重連結な遊走領域を持つような超越盤函数の例を、擬等角手術を用いて構成した。更に同様の手法により、任意の自然数nに対してn重連結な遊走領域をもつ超越整函数の例も構成し、未解決であった存在問題を解いた。This research project has been carried out as planned, and each researcher who took responsibility for part of this project has achieved satisfactory results as follows :(0)Tohge studied some complex differential or functional equations and their solutions given as meromorphic functions in the plane. A new knowledge for the existence of those solutions was obtained and known estimates on the value distribution of those functions were sharpened considerably. He also considered how the facts obtained in this research relate to other subjects and found a guide for further researches.(1)Taniguchi studied the complex dynamics of entire functions, especially those of structurally finite entire functions in detail and succeeded to geometrize them combinatorically. He also investigated the structures of the spaces of Bell representations and the modified spaces of structurally finite entire functions, and studied related covering structure and dynamical structure of those functions.(2)Shimomur a studied function theoretic properties of the Painleve transcendents and gave the sharp estimates for the growth orders in both directions. He also observed the value distribution of fourth Painleve PIV concerning its moving targets.(3)Morosawa generalized the concept of semi-hyperbolic for rational functions into transcendental entire functions and also introduced the "complex" error function in order to investigate its dynamical properties at large and obtain new information on the figure of Julia sets, non-existence of wandering domains and Baker domains of those functions. He also obtained a result concerning the convergence of the sequence of Fatou sets of polynomials converging uniformly to a transcendental entire function.(4)Ishizaki studied various types of functional equations, which possess meromorphic solutions in the whole complex plane. Especially, he proved the existence of those solutions to linear difference equations and q-difference equations, as well as an exact estimate for their growth order. Then a new method, which seems to be applicable widely, was developed in the process.(5)Kisaka concentrated on the study of complex dynamics of entire functions, and succeeded to construct an example of transcendental functions, which possess a doubly-connected wandering domain by the method of quasi-conformal surgery. He also gave an example of those functions with a wandering domain of arbitrary assigned connectivity and settled this existence problem posed by I.N.Baker about 40 years ago.研究課題/領域番号:14540166, 研究期間(年度):2002-2003出典:「値分布論と複素力学系を応用した函数方程式の研究」研究成果報告書 課題番号14540166 (KAKEN:科学研究費助成事業データベース(国立情報学研究所))   本文データは著者版報告書より作
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