Experimental Physics Division (EPD) seminar
Title I: Proton-driven plasma wakefield acceleration (AWAKE), current status and future plans
Title II: Plasma beam dump-towards a compact future accelerator
Speaker: Dr. Guoxing Xia (the University of Manchester and the Cockroft Institute)
Time: 09:30, Friday 28th December 2018
Location: B326 main building
Indico: https://indico.ihep.ac.cn/event/9158/
Abstract I: Proton-driven plasma wakefield acceleration (AWAKE), current status and future plans
Plasma-based accelerators have achieved tremendous progress in the last three decades, thanks to the availability of ultrashort and high power lasers and relativistic electron beams. Nowadays, laser wakefield acceleration (LWFA) has routinely achieved GeV beam energy in centimeter long plasma channel. Electron beam driven plasma wakefield acceleration (PWFA) has achieved the energy doubling of a 42 GeV SLC electron beam at SLAC and proved the high efficiency acceleration for electrons and positrons, respectively. The new plasma-based acceleration experiment, so-called AWAKE at CERN has very recently demonstrated the successful acceleration of electrons to up to 2 GeV in a proton driven plasma wakefield. In this talk, I will introduce the basic principles and the development of proton-driven plasma wakefield acceleration scheme. The latest experimental results and its future plans.
References:
[1] AWAKE Collaboration, Acceleration of electrons in the plasma wakefield of a proton bunch, Nature 561, 363-367 (2018).
[2] AWAKE Collaboration, Experimental observation of proton bunch modulation in a plasma, at varying plasma densities, accepted to be published in Phys. Rev. Lett. (2018).
[3] AWAKE Collaboration, Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch, accepted to be published in Phys. Rev. Lett. (2018).
Abstract II: Plasma beam dump-towards a compact future accelerator
Plasma wakefield can be used to accelerate the particle bunch to high energies in relatively short distances. Meanwhile the plasma wakefield can also be utilized to decelerate the particle bunches more efficiently than the conventional beam dump facilities. Our recent studies show that a properly designed plasma beam dump can effectively absorb the beam energy in a much compact setup. The other advantage of plasma beam dump lies in the fact that the resultant products after beam dump have much less radioactive hazards, compared to conventional material based beam dumps. An international consortium has been initiated to study this plasma beam dump effect with the aims to achieving the compact future accelerator and the possibility to recycle the energy from plasma.
Reference:
[1] K. Hanahoe, G. Xia et al., Simulation study of a passive plasma beam dump using varying plasma density, Physics of Plasmas 24, 023120 (2017); https://doi.org/10.1063/1.4977449.
About the speaker:
夏國興博士，目前任職于英國曼徹斯特大學(xué)物理和天文學(xué)院和Cockcroft 加速器科學(xué)研究所研究員（永久職位）。1997 年畢業(yè)于蘭州大學(xué)現(xiàn)代物理學(xué)系原子核物理專業(yè)，2000 年蘭州大學(xué)現(xiàn)代物理系獲理學(xué)碩士學(xué)位（導(dǎo)師孫別和研究員），2003 年在中國科學(xué)院近代物理研究所獲加速器物理和工程博士學(xué)位（導(dǎo)師魏寶文院士和夏佳文院士）。2003-2005 年在北京大學(xué)物理學(xué)院做博士后研究（合作導(dǎo)師：陳佳洱院士，郭之虞教授）。2005 年起在德國電子同步加速器研究所DESY 做博士后研究（合作導(dǎo)師：Prof. Dr. Eckhard Elsen），主要參與國際直線對撞機的研發(fā)并負(fù)責(zé)阻尼環(huán)的束流動力學(xué)研究，期間因為工作出色獲得DESY 的所長研究獎。2008 年起在德國馬普物理研究所（Max Planck Institute for Physics）做研究科學(xué)家(合作導(dǎo)師：Prof. Dr. Allen Caldwell)，領(lǐng)導(dǎo)先進粒子加速器研究組 （包括質(zhì)子驅(qū)動等離子體尾場加速和Muon 子冷卻實驗組）。夏國興博士目前在領(lǐng)導(dǎo)曼徹斯特大學(xué)先進粒子加速器研究組，主要參與CERN 的AWAKE 國際合作實驗項目 （質(zhì)子驅(qū)動等離子尾場加速實驗），另外積極開展基于激光和相對論電子束驅(qū)動的等離子尾場加速和電介質(zhì)加速器研發(fā)以及先進材料在高能粒子加速器中的應(yīng)用等。夏博士是Cockcroft 加速器科學(xué)研究所主管研究生教育和培訓(xùn)的常務(wù)主任。負(fù)責(zé)博士研究生課程的規(guī)劃，教學(xué)和招生等。夏博士研究組主要研究領(lǐng)域包括：基于超短超強激光脈沖和相對論帶電粒子束流驅(qū)動的先進等離子體加速器，束流和激光驅(qū)動電介質(zhì)加速器的研發(fā)，加速器束流動力學(xué)，先進材料在加速器中的應(yīng)用和基于激光冷卻原子的超冷強流電子束等。夏博士目前已指導(dǎo)博士生 7 名，博士后3 名。夏博士已在各類期 刊發(fā)表論文150 余篇，文章被引用1100 多次，他也是國際期刊Physical Review Letters, Nuclear Instruments and Methods in Physics Research A, Physical Review Accelerators and Beams 等的審稿人。另外， 夏博士帶領(lǐng)的團隊還積極參與歐盟地平線Horizon 2020 資助的科研項目EuPRAXIA (是WP10 的召集人)和FCC (Future Circular Collider)。夏博士還是歐洲先進粒子加速器會議EAAC15 和 EAAC17 國際顧問委員會委員，也是英國等離子體加速器指導(dǎo)委員會核心成員。
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