Design of CEPC superconducting RF system

2019 ◽  
Vol 34 (13n14) ◽  
pp. 1940006 ◽  
Author(s):  
Jiyuan Zhai ◽  
Dianjun Gong ◽  
Hongjuan Zheng ◽  
Peng Sha ◽  
Qiang Ma ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Rf System ◽  
Production Threshold ◽  
Center Of Mass Energy ◽  
Double Ring ◽  
Beam Loading ◽  
Electron Positron ◽  
Wide Range ◽  
Superconducting Rf ◽  
Conceptual Design Report

CEPC is a 100-km double-ring circular electron–positron collider operating at 90–240 GeV center-of-mass energy of Z-pole, WW-pair production threshold and Higgs resonance. The conceptual design report (CDR) of CEPC has been published as an important step to move the project forward. The superconducting RF (SRF) system is one of the most important and challenging accelerator systems due to the wide range of beam energy and current. In this paper, the layout, parameters and configuration of the superconducting RF system for the CEPC collider ring will be introduced. Issues of beam cavity interactions including transient beam loading and coupled-bunch instabilities of accelerating mode are discussed.

RF parameters design for a Circular Electron–Positron Collider

2021 ◽  
pp. 2142004
Author(s):  
Dianjun Gong ◽  
Jie Gao ◽  
Jiyuan Zhai
Keyword(s):  
System Design ◽  
Double Ring ◽  
Beam Loading ◽  
Electron Positron ◽  
Loading Effects ◽  
Analytical Formulas ◽  
Preliminary Study ◽  
First Time ◽  
Conceptual Design Report ◽  
General Method

Radio frequency (RF) parameters design is an important part in RF system design. In this paper we will introduce a general method of choosing appropriate RF parameters for a circular [Formula: see text] collider. The RF parameters are determined with several analytical formulas. With this method, the RF parameters of the Circular Electron–Positron Collider (CEPC) for Conceptual Design Report (CDR) are verified. A new set of RF parameters for the CEPC with 1-cell LG Nb cavities is also designed. Besides, the RF parameters of the CEPC Advanced Partial Double Ring (APDR) and the CEPC Damping Ring (DR) are designed for the first time, and a preliminary study of the beam loading effects of APDR and DR is also carried out.

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

scholarly journals Prospects for rare and forbidden hyperon decays at BESIII

2017 ◽  
Vol 12 (5) ◽  
Author(s):  
Hai-Bo Li
Keyword(s):  
Rare Decays ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Final States ◽  
Electron Spectrometer ◽  
Mass Energy ◽  
Measurement Sensitivity ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
Hyperon Decays

Abstract The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of J/ψ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron–Positron Collider II. About 106–108 hyperons, i.e., Λ, Σ, Ξ, and Ω, will be produced in the J/ψ and ψ(2S) decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of 10−5–10−8. In addition, with the known center-of-mass energy and “tag technique”, rare decays and decays with invisible final states can be probed.

Hadron Production by Electron-Positron Annihilation at 4-GeV Center-of-Mass Energy

1973 ◽  
Vol 30 (23) ◽  
pp. 1189-1192 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

scholarly journals Future Circular Colliders

2019 ◽  
Vol 69 (1) ◽  
pp. 389-415 ◽  
Author(s):  
M. Benedikt ◽  
A. Blondel ◽  
P. Janot ◽  
M. Klein ◽  
M. Mangano ◽  
...  
Keyword(s):  
Particle Physics ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Heavy Ion ◽  
New Physics ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Physics Program ◽  
Electron Positron

After 10 years of physics at the Large Hadron Collider (LHC), the particle physics landscape has greatly evolved. Today, a staged Future Circular Collider (FCC), consisting of a luminosity-frontier highest-energy electron–positron collider (FCC-ee) followed by an energy-frontier hadron collider (FCC-hh), promises the most far-reaching physics program for the post-LHC era. FCC-ee will be a precision instrument used to study the Z, W, Higgs, and top particles, and will offer unprecedented sensitivity to signs of new physics. Most of the FCC-ee infrastructure could be reused for FCC-hh, which will provide proton–proton collisions at a center-of-mass energy of 100 TeV and could directly produce new particles with masses of up to several tens of TeV. This collider will also measure the Higgs self-coupling and explore the dynamics of electroweak symmetry breaking. Thermal dark matter candidates will be either discovered or conclusively ruled out by FCC-hh. Heavy-ion and electron–proton collisions (FCC-eh) will further contribute to the breadth of the overall FCC program. The integrated FCC infrastructure will serve the particle physics community through the end of the twenty-first century. This review combines key contents from the first three volumes of the FCC Conceptual Design Report.

scholarly journals PROGRESS WITH THE JLC/NLC X-BAND LINEAR COLLIDER DESIGN

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1193-1196
Author(s):  
T. O. Raubenheimer
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
Cost Savings ◽  
Significant Cost ◽  
Center Of Mass Energy ◽  
Physics Program ◽  
Electron Positron ◽  
X Band ◽  
Beam Delivery ◽  
Beam Delivery System

An electron/positron linear collider with a center-of-mass energy between 0.5 and 1 TeV would be an important complement to the physics program of the LHC in the next decade. The Next Linear Collider (NLC) is being designed by a US collaboration (FNAL, LBNL, LLNL, and SLAC) which is working closely with the Japanese collaboration that is designing the Japanese Linear Collider (JLC). This paper will discuss the technical difficulties encountered as well as the changes that have been made to the NLC design over the last year. These changes include improvements to the X-band rf system as well as modifications to the beam delivery system. The net effect has been to reduce the length of the collider from about 32 km to 25 km and to reduce the number of klystrons and modulators by a factor of two. Together these lead to significant cost savings.

Hadron Production by Electron-Positron Annihilation at 4-GeV Center- of-Mass Energy.

1973 ◽  
Vol 30 (26) ◽  
pp. 1349-1349 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Linear Colliders

2014 ◽  
Vol 07 ◽  
pp. 115-136
Author(s):  
Akira Yamamoto ◽  
Kaoru Yokoya
Keyword(s):  
Linear Collider ◽  
International Linear Collider ◽  
Electron Positron ◽  
Linear Colliders ◽  
Technical Design Report ◽  
Superconducting Rf ◽  
Technical Features ◽  
Energy Frontier ◽  
Conceptual Design Report

An overview of linear collider programs is given. The history and technical challenges are described and the pioneering electron–positron linear collider, the SLC, is first introduced. For future energy frontier linear collider projects, the International Linear Collider (ILC) and the Compact Linear Collider (CLIC) are introduced and their technical features are discussed. The ILC is based on superconducting RF technology and the CLIC is based on two-beam acceleration technology. The ILC collaboration completed the Technical Design Report in 2013, and has come to the stage of "Design to Reality." The CLIC collaboration published the Conceptual Design Report in 2012, and the key technology demonstration is in progress. The prospects for further advanced acceleration technology are briefly discussed for possible long-term future linear colliders.

Hadron Production by Electron - Positron Annihilation at 5 GeV Center - of Mass Energy

1974 ◽  
Vol 32 (8) ◽  
pp. 432-435 ◽  
Author(s):  
G. Tarnopolsky ◽  
J. Eshelman ◽  
M. E. Law ◽  
J. Leong ◽  
H. Newman ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron
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