Effect of electron beam cooling on transversal and longitudinal emittance of an external proton beam

2018 ◽  
Vol 880 ◽  
pp. 15-21
Author(s):  
K. Kilian ◽  
H. Machner ◽  
A. Magiera ◽  
D. Prasuhn ◽  
P. von Rossen ◽  
...  
Keyword(s):  
Electron Beam ◽  
Proton Beam ◽  
Beam Cooling

scholarly journals Searches for the Anomalous FCNC Top-Higgs Couplings with Polarized Electron Beam at the LHeC

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
XiaoJuan Wang ◽  
Hao Sun ◽  
Xuan Luo
Keyword(s):  
Multivariate Analysis ◽  
Electron Beam ◽  
Proton Beam ◽  
Beam Energy ◽  
Branching Ratio ◽  
Beam Polarization ◽  
Electron Beam Energy ◽  
Associated Production ◽  
Single Top

We study the single top and Higgs associated productione-p→νet-→νehq-(h→bb-)in the top-Higgs FCNC couplings at the LHeC with the electron beam energy ofEe=60 GeV andEe=120 GeV and combination of a 7 TeV and 50 TeV proton beam. With the possibility ofe-beam polarization (pe=0,±0.6), we distinct the cut-based method and the multivariate analysis- (MVA-) based method and compare with the current experimental and theoretical limits. It is shown that the branching ratioBr(t→uh)can be probed to 0.113 (0.093%), 0.071 (0.057%), 0.030 (0.022%), and 0.024 (0.019%) with the cut-based (MVA-based) analysis at (Ep,Ee) = (7 TeV, 60 GeV), (Ep,Ee) = (7 TeV, 120 GeV), (Ep,Ee) = (50 TeV, 60 GeV), and (Ep,Ee) = (50 TeV, 120 GeV) beam energy and 1σlevel. With the possibility ofe-beam polarization, the expected limits can be probed down to 0.090 (0.073%), 0.056 (0.045%), 0.024 (0.018%), and 0.019 (0.015%), respectively.

scholarly journals Acquired resistance of B16 tumor cells to protons after prolonged fractional electron irradiation

2020 ◽  
Vol 29 (4) ◽  
pp. 69-83
Author(s):  
E.E. Beketov ◽  
◽  
E.V. Isaeva ◽  
N.V. Nasedkina ◽  
I.A. Zamulaeva ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Electron Beam ◽  
Total Dose ◽  
Tumor Cells ◽  
Proton Beam ◽  
Phase Distribution ◽  
Clonogenic Assay ◽  
Treatment Plan ◽  
Cycle Phase ◽  
Fractionated Irradiation

Cancer radiotherapy effectiveness largely depends on tumor cells radiosensitivity. Inherent or acquired radioresistance of tumor cells is important challenge in radiation therapy. Response of tumor cells to fractionated radiation therapy has been investigated by many research groups. At present time the use of protons for cancer research and treatment has expanded rapidly. In this connection research on sensitivity of tumor cells to proton beam therapy is an urgent task. The aim of the study was to assess sensitivity of irradiated with electrons or protons B16 melanoma cells to the next electron beam or proton beam irradiation at comparable total doses. Studies with the use of stable tumor cell lines with acquired radioresistance may be useful for the develop-ment of effective treatment plan tailored to the patients with relapses or metastases that have oc-curred after prior unsuccessful radiotherapy with standard types of radiation. Protons were pro-vided by Prometeus installation scanning beam and the electron beam of the accelerator Novac-11. Cells radiosensitivity was measured by clonogenic assay. The resistance of cells first irradiat-ed with protons and electrons to the next irradiation with protons and electrons was estimated by clonogenic assay. DNA damages, cell size, proliferative activity and cell cycle phase distribution were also evaluated. The study demonstrated that fractionated irradiation of B16 cells with elec-trons at the total dose of 60 Gy causes significant reduction of cells radiosensitivity to the next ir-radiation with protons, radiosensitivity of irradiated cells to the second irradiation with electrons remains the same. In contrast, the first fractionated irradiation of cells with protons at the total dose of 50 Gy does not affect the radiosensitivity of the cells to the next irradiation with electrons or protons.

HERA+LC-BASED γp COLLIDER: LUMINOSITY AND PHYSICS

1996 ◽  
Vol 11 (11) ◽  
pp. 2019-2044 ◽  
Author(s):  
Z.Z. AYDIN ◽  
A.T. ALAN ◽  
S. ATAĞ ◽  
O. ÇAKIR ◽  
A. ÇELIKEL ◽  
...  
Keyword(s):  
Electron Beam ◽  
Heavy Quark ◽  
Proton Beam ◽  
Research Program ◽  
Linear Accelerator ◽  
High Energy ◽  
Hadron Colliders ◽  
Collision Point ◽  
Laser Photon ◽  
Compton Backscattering

We discuss the possibility of constructing a linac ring type ep collider and a γp collider based on it at DESY, namely the HERA+LC proposal. Using the parameters of the proton ring of HERA and those of the proposed linear e+e− collider (LC), we expect a luminosity of Lγp=1–2×1031 cm−2s−1, due to reasonable improvement of the proton beam. In a γp collider, the high energy γ beam is produced by the Compton backscattering of laser photons off the electron beam from the linear accelerator. In the case of the opposite choice of laser photon and electron beam helicities, the luminosity of γp collisions still exceeds 1031 cm−2s−1 up to a distance of 12 m between the conversion region and the collision point. We examine the physics research program for the HERA+LC γp collider proposal. The search for supersymmetric partners, leptoquark production and heavy quark investigations are considered in detail. The capacity of HERA+LC surpasses that of HERA and is comparable with the LC. Polarization facilities of the gamma and proton beams, and the clearer background compared to the hadron colliders, are stated as additional advantages of the proposed γp collider.

scholarly journals Electron beam cooling in intense focussed laser pulses

2017 ◽  
Author(s):  
Samuel R. Yoffe ◽  
Adam Noble ◽  
Alexander J. Macleod ◽  
Dino A. Jaroszynski
Keyword(s):  
Electron Beam ◽  
Laser Pulses ◽  
Beam Cooling
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