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.

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.

Magnetic structure of ionizing shock waves Part 3. Normal shocks

1972 ◽  
Vol 7 (1) ◽  
pp. 177-185 ◽  
Author(s):  
B. P. Leonard
Keyword(s):  
Magnetic Field ◽  
Shock Waves ◽  
Electric Field ◽  
Field Component ◽  
Magnetic Energy ◽  
Transverse Field ◽  
Transverse Magnetic ◽  
En Numbers ◽  
Magnetic Field Magnitude ◽  
Oblique Shocks

Normal ionizing shock waves are considered as a subclass of oblique shocks in which the upstream transverse magnetic field component is zero; i.e. the upstream field is normal to the plane of the shock. Non-trivial (switch-on) normal shocks involve a non-zero downstream transverse field component; magnetically trivial normal shocks are simply gas shocks with an imbedded constant normal magnetic field. As with oblique shocks, switch-on normal ionizing shock waves are plane- polarized, provided the conductivity is a scalar. Ohmic structures are discussed for several values of shock Alfv én number, treating the electric field as a free parameter, as usual. For Alfv én numbers extending from zero to two (for the infinite-Mach-number case), there is always a finite range of E field values. Above two, only the gas shock exists, and this requires a unique electric field value. Because the magnetic field magnitude increases through switch-on shocks, there is no mechanism available for converting magnetic energy into thermal energy, as is the case for oblique or skew shocks. Thus, there is no significant downstream heating above the viscous temperature; and, in some cases, slight downstream cooling may even occur. Expansion shocks are not possible in this geometry. Previous studies are reviewed in the light of structural requirements, and some erroneous results are clarified; in particular, it should be noted that MHD switchon solutions for the pre-ionized case are not imbedded in the family of ionizing switch-on solutions.

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.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document