Accelerator physics design in the interaction region for CEPC double ring scheme

2019 ◽  
Vol 34 (13n14) ◽  
pp. 1940002 ◽  
Author(s):  
Sha Bai ◽  
Chenghui Yu ◽  
Yiwei Wang ◽  
Yingshun Zhu ◽  
Jie Gao
Keyword(s):  
Radiation Power ◽  
Critical Energy ◽  
Small Region ◽  
Research Area ◽  
Interaction Region ◽  
Design Parameters ◽  
Accelerator Physics ◽  
High Luminosity ◽  
Double Ring ◽  
Electron Positron

With the discovery of the Higgs boson at around 125 GeV, a circular Higgs factory design with high luminosity [Formula: see text] is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron–positron colliders, especially in CEPC; it is one of the criteria to measure the accelerator and detector design performance. Because of the limited space available in the designed tunnel, many equipment including magnets, beam diagnostic instruments, masks, vacuum pumps, and components of the detector must coexist in a very small region. In this paper, some important MDI issues will be reported for the Interaction Region (IR) design, e.g. the final doublet quadrupoles physics design parameters, beam-stay-clear region and beam pipe, synchrotron radiation power and critical energy are also calculated.

Heat load in IR from synchrotron radiation and beam loss for CEPC double ring scheme

2021 ◽  
pp. 2142012
Author(s):  
Sha Bai ◽  
Chenghui Yu ◽  
Yiwei Wang ◽  
Jie Gao
Keyword(s):  
Synchrotron Radiation ◽  
Temperature Rise ◽  
Load Distribution ◽  
Heat Load ◽  
Superconducting Magnet ◽  
Research Area ◽  
Interaction Region ◽  
Beam Loss ◽  
Double Ring ◽  
Electron Positron

With the discovery of the Higgs boson at around 125 GeV, a circular Higgs factory design with high luminosity [Formula: see text] is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron–positron colliders, especially in CEPC, since the synchrotron radiation (SR) photons can contribute to the heat load of the beam pipe and radiation dose may damage the components. And the heat load can cause the temperature rise in some part, and if the temperature rise is too high, the beryllium pipe in the interaction region will melt and the superconducting magnet may quench. Thus, the heat load distribution from synchrotron radiation and beam loss in the interaction region are analyzed carefully and results are given in this paper.

Superconducting quadrupole magnet R&D in the interaction region of CEPC

2021 ◽  
pp. 2142007
Author(s):  
Chuang Shen ◽  
Yingshun Zhu ◽  
Xiangchen Yang ◽  
Ran Liang ◽  
Fusan Chen
Keyword(s):  
Magnetic Field ◽  
Interaction Region ◽  
High Luminosity ◽  
Design Study ◽  
Interaction Point ◽  
High Gradient ◽  
Quadrupole Magnet ◽  
Electron Positron ◽  
Magnetic Length ◽  
Design And Manufacture

To obtain high luminosity, compact high gradient quadrupole magnets QD0 and QF1 are required on both sides of the interaction points of the proposed Circular Electron Positron Collider (CEPC). QD0 is a double aperture superconducting quadrupole closest to the interaction point with a crossing angle between two aperture centerlines of 33 mrad. Magnetic field crosstalk between two apertures of QD0 is negligible using iron yoke, and the 3D coil end is optimized by ROXIE. In the design study, both NbTi conductor and HTS conductor are taken into account. The first step of the R&D is to design and manufacture a QD0 short model magnet with a magnetic length of 0.5 m. In this paper, the R&D status of QD0 short model magnet is described, and the design study of quadrupole magnet including NbTi technology and HTS Bi-2212 technology is presented.

CEPC partial double ring lattice design and SPPC lattice design

2016 ◽  
Vol 31 (33) ◽  
pp. 1644017 ◽  
Author(s):  
Feng Su ◽  
Jie Gao ◽  
Dou Wang ◽  
Yiwei Wang ◽  
Jingyu Tang ◽  
...  
Keyword(s):  
High Luminosity ◽  
Proton Proton ◽  
Baseline Design ◽  
Lower Power ◽  
Single Beam ◽  
Double Ring ◽  
Lattice Design ◽  
Beam Pipe ◽  
Electron Positron ◽  
Dynamic Aperture

In this paper, we introduce the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring scheme and the lattice design of Super-Proton-Proton-Collider (SPPC). The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme and it is not suitable to serve as a high luminosity [Formula: see text] factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity [Formula: see text] factory. In this paper, we discuss the details of CEPC partial double ring lattice design and show the dynamic aperture study and optimization. We also show the first version of SPPC lattice although it needs lots of work to do and to be optimized.

Synchrotron radiation in terms of accelerator for CEPC MDI

2020 ◽  
Vol 35 (15n16) ◽  
pp. 2041004
Author(s):  
Sha Bai ◽  
Chenghui Yu ◽  
Yiwei Wang ◽  
Jie Gao
Keyword(s):  
Magnetic Field ◽  
Higgs Boson ◽  
Synchrotron Radiation ◽  
Field Component ◽  
Research Area ◽  
Transverse Magnetic ◽  
Influential Factor ◽  
High Luminosity ◽  
Interaction Point ◽  
Electron Positron

With the discovery of the Higgs boson at around 125 GeV, a circular Higgs factory design with high luminosity [Formula: see text] is becoming more popular in the accelerator world. The Circular Electron and Positron Collider (CEPC) project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron–positron colliders, especially in CEPC. Since the [Formula: see text] beams collide at the Interaction Point (IP) with a horizontal angle of 33 mrad, the horizontal trajectory will couple to the vertical. Due to the solenoid and anti-solenoid combined field strength quite high, the maximum could be up to 4.2 T, the transverse magnetic field component is also quite high. Thus synchrotron radiation (SR) from vertical trajectory in combined field should be taken into account. And also synchrotron radiation is an important influential factor in the collimator design of CEPC MDI. These two effects are analyzed in this paper.

scholarly journals Development of a Novel Double-Ring Deployable Mesh Antenna

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Yan Xu ◽  
Fuling Guan ◽  
Xian Xu ◽  
Hongjian Wang ◽  
Yao Zheng
Keyword(s):  
Low Frequency ◽  
Design Concept ◽  
Design Parameters ◽  
Accuracy Measurement ◽  
Double Ring ◽  
Reflective Surface ◽  
Final Design ◽  
Geometric Relationship ◽  
Relationship Of ◽  
Adjustment Test

This paper addresses a type of deployable mesh antenna consisting of the double-ring deployable truss edge frame and the cable net reflector. The structural design concept of the deployable antennas is presented. The deployable truss is designed and the geometric relationship of each strut length is formulated. Two types of radial truss elements are described and compared. The joint pattern and the active cables of the final design concept are determined. The pattern of the cable net is the three-orientation grid. Two connection schemes between the reflector and the deployable edge frame are investigated. The design parameters and the shape adjustment mechanism of this cable net are determined. The measurement test technologies of the antennas on the ground including test facilities, deployment test, and measurement and adjustment test are proposed. The antenna patterns are analyzed based on the real surfaces of the reflector obtained by the reflective surface accuracy measurement. The tests and analytic results indicated that the accuracy of the reflective surface is high and is suitable for low-frequency communication.

scholarly journals The High Luminosity LHC interaction region magnets towards series production

2021 ◽  
Author(s):  
Ezio Todesco ◽  
Hugo Bajas ◽  
Marta Bajko ◽  
Amalia Ballarino ◽  
Susana Izquierdo Bermudez ◽  
...  
Keyword(s):  
Interaction Region ◽  
Series Production ◽  
High Luminosity

scholarly journals Bounds on dipole moments of tau-neutrino from single photon searches in SU(4)L × U(1)X model at CLIC and ILC energies

2019 ◽  
Vol 34 (11) ◽  
pp. 1950062 ◽  
Author(s):  
D. T. Binh ◽  
Vo Van On ◽  
H. N. Long
Keyword(s):  
Dipole Moment ◽  
Single Photon ◽  
Dipole Moments ◽  
High Energy ◽  
Linear Electron ◽  
High Luminosity ◽  
Electric Dipole Moments ◽  
Tau Neutrino ◽  
Electron Positron ◽  
Text Model

We investigate the dipole moments of the tau-neutrino at high-energy and high luminosity at linear electron–positron colliders, such as CLIC or ILC through the analysis of the reaction [Formula: see text] in the framework of the [Formula: see text] model. The limits on dipole moment were obtained for integrated luminosity of [Formula: see text] and mass ranging from 0.25 to 1.0 TeV. The estimated limits for the tau-neutrino magnetic and electric dipole moments at 95% of confidence level are [Formula: see text] and [Formula: see text] improved by 2–3 orders of magnitude compared to L3 and complement previous studies on the dipole moments.

scholarly journals Pair Production in AGN

1989 ◽  
Vol 134 ◽  
pp. 194-196
Author(s):  
C. Done ◽  
A. C. Fabian
Keyword(s):  
Pair Production ◽  
Compton Scattering ◽  
Energy Flux ◽  
Large Fraction ◽  
Small Region ◽  
X Rays ◽  
X Ray ◽  
Electron Positron ◽  
Γ Rays ◽  
Radiant Power

The X-ray luminosity and variability of many AGN are sufficiently extreme that any hard γ-rays produced in the source will collide with the X-rays and create electron-positron pairs, rather than escape. A small region where vast amounts of energy are produced, such as an AGN, is an ideal place to accelerate particles to relativistic energies and so produce γ-rays by Compton scattering. The observed X-ray spectra of AGN are hard and indicate that most of the luminosity is at the highest energies so that absorption of the γ-rays represents a large fraction of the energy flux, which can then be re-radiated at lower energies. Pairs can thus effectively reprocess much of the radiant power in an AGN.

Planar integrated plasmonic mid-IR spectrometer

2013 ◽  
Vol 1510 ◽  
Author(s):  
Farnood K. Rezaie ◽  
Chris J. Fredericksen ◽  
Walter R. Buchwald ◽  
Justin W. Cleary ◽  
Evan M. Smith ◽  
...  
Keyword(s):  
Molecular Interaction ◽  
Broad Band ◽  
Interaction Region ◽  
Silicon On Insulator ◽  
Optical Methods ◽  
Ring Resonators ◽  
Design Parameters ◽  
Dynamic Simulations ◽  
Waveguide Modes ◽  
Resonator Design

ABSTRACTA compact spectrometer-on-a-chip featuring a plasmonic molecular interaction region has been conceived, designed, modeled, and partially fabricated. The silicon-on-insulator (SOI) system is the chosen platform for the integration. The low loss of both silicon and SiO2 between 3 and 4 μm wavelengths enables silicon waveguides on SiO2 as the basis for molecular sensors at these wavelengths. Important characteristic molecular vibrations occur in this range, namely the bond stretching modes C-H (Alkynes), O-H (monomeric alcohols, phenols) and N-H (Amines), as well as CO double bonds, NH2, and CN. The device consists of a broad-band infrared LED, photonic waveguides, photon-to-plasmon transformers, a molecular interaction region, dispersive structures, and detectors. Photonic waveguide modes are adiabatically converted into SPPs on a neighboring metal surface by a tapered waveguide. The plasmonic interaction region enhances optical intensity, which allows a reduction of the overall device size without a reduction of the interaction length, in comparison to ordinary optical methods. After the SPPs propagate through the interaction region, they are converted back into photonic waveguide modes by a second taper. The dispersing region consists of a series of micro-ring resonators with photodetectors coupled to each resonator. Design parameters were optimized via electro-dynamic simulations. Fabrication was performed using a combination of photo- and electron-beam-lithography together with standard silicon processing techniques.

scholarly journals Z′Resonance and AssociatedZhProduction at Future Higgs Boson Factory: ILC and CLIC

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
A. Gutiérrez-Rodríguez ◽  
M. A. Hernández-Ruíz
Keyword(s):  
Higgs Boson ◽  
Total Cross Section ◽  
Cross Section ◽  
Center Of Mass ◽  
High Energy ◽  
Precision Measurements ◽  
Linear Electron ◽  
High Luminosity ◽  
Electron Positron

We study the prospects of theB-Lmodel with an additionalZ′boson to be a Higgs boson factory at high-energy and high-luminosity linear electron positron colliders, such as the ILC and CLIC, through the Higgs-strahlung processe+e-→(Z,Z′)→Zh, including both the resonant and the nonresonant effects. We evaluate the total cross section ofZhand we calculate the total number of events for integrated luminosities of 500–2000 fb−1and center of mass energies between 500 and 3000 GeV. We find that the total number of expectedZhevents can reach 106, which is a very optimistic scenario and it would be possible to perform precision measurements for bothZ′and Higgs boson in future high-energye+e-colliders experiments.

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