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

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.

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

International Journal of Modern Physics A ◽

10.1142/s0217751x19400025 ◽

2019 ◽

Vol 34 (13n14) ◽

pp. 1940002 ◽

Cited By ~ 2

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.

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Synchrotron radiation in terms of accelerator for CEPC MDI

International Journal of Modern Physics A ◽

10.1142/s0217751x20410043 ◽

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.

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