DOCSLIB.ORG

Review of Microwave Guns

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Review of Microwave Guns Particle Accelerators, 1991, Vol. 36, pp.33-74 © 1991 Gordon & Breach Science Publishers, S.A. Reprints available directly from the publisher Printed in the United Kingdom. Photocopying permitted by license only REVIEW OF MICROWAVE GUNS C. TRAVIER Laboratoire de I'Accelerateur Lineaire, IN2P3-CNRS et Universite de Paris-Sud, 91405 Orsay, Cedex, France (Received 15 October 1990; in final form 30 July 1991) Free Electron Lasers and future high energy linear colliders require very bright electron beams. Since conven­ tional injectors made of DC guns and RF bunchers have intrinsic limitations, an important R&D endeavour has been undertaken worldwide to develop a new type of bright electron source: the microwave or RF gun. After describing briefly the conventional injector and its limitations, the basic principles of RF gun are pre­ sented showing that there exist three types of gun. The technology state of the art is then shortly addressed. The thirty currently on-going RF gun projects are reviewed. Their specific characteristics are outlined and their nominal performances are given. Finally, the basic ideas of RF gun design are exposed. 1. INTRODUCTION The advent of free electron lasers and the perspective of high energy linear colliders boosted the development of high-brightness electron sources. During the last decade, the arrival of RF guns and photocathodes have offered a promise to reach the expected performances. In 1984, G.A. Westenskow and 1.M.l. Madey put a thermionic cathode directly in an RF cavity. 48 This new type of gun was named "RF gun" or "microwave gun". Meanwhile, Lee et al. reported that very high current densities could be obtained from semiconductor photocathodes. 75 Then, 1.S. Fraser and R.L. Sheffield experimented the use of such photocathodes in an RF gun. 74,78 In 1988, the "first demonstration of a FEL driven by electrons from a laser irradiated photocathode" was made at Stanford. 52 Since that time, many laboratories have begun to study both thermionic and laser­ driven RF guns. Almost thirty projects are identified in this review showing the strong interest manifested for this new bright electron source. Fig. 1 shows the exponential evolution of the number of projects over the past 8 years. It also shows the increasing preponderance of photoinjectors. From Fig. 2, it can be seen that half of the RF guns are developed for FEL purposes. After a brief summary of the beam quality requirements for the different applications, the basic principles of conventional injectors and RF guns are described and their merits are compared. A review of the different projects is then presented including a short description of the most advanced ones. The last part deals with the present understanding of RF gun design and introduces some novel ideas recently proposed. Previous bright 33 P.A.-B 34 c. TRAVIER 35 ......-----------.-........I""""P""'..................,......... _ THERMIONIC RF GUNS en 30 ~ LASER-DRIVEN RF GUNS b w 25 o FIELD EMISSION RF GUNS ~ t-----...----...-........-----,....---....--.I a.. 20 LL o 15 a: w co 10 ~ :::> z 5 83 84 85 86 87 88 89 90 YEAR FIGURE 1 Current number of RF gun projects. • FEL ~ OTHER PURPOSES o~~~-...­ 83 84 85 86 87 88 89 90 YEAR FIGURE 2 Projects purpose. REVIEW OF MICROWAVE GUNS 35 ... .... TM : macropulse length fM : macropulse repetition frequency Tm : micropulse length f m : micropulse repetition frequency FIGURE 3 Pulse format. injector reviews can be found in references. 6,7, 8, 9, 10, 11 2. HIGH QUALITY BEAM REQUIREMENTS 2.1. Some definitions Many parameters are used to characterize the quality of an electron beam produced by an electron source or injector. The most important are: • the pulse format: the beam is made of pulses of a certain length (micropulse length) repeated at a given frequency (micropulse repetition rate) and with some timing jitter. This train of pulses has a certain duration (macropulse length) and is also repeated (macropulse repetition rate). An example of pulse format is shown in Fig. 3. • the peak current defined as the current in the micropulse. • the energy spread: the dispersion in energy within a micropulse. It can be ex­ pressed either in relative or absolute values. • the emittance which is a measure of the distribution of the beam in the phase space. There are several definitions of emittance. 1 In order to be consistent and unless otherwise mentioned, all the emittances quoted in this paper are r.m.s. transverse normalized emittances 2, 3 defined as: where x is the coordinate of a particle in the beam, Px is the particle's momentum component in the x direction and < > indicates averaging over the electron 36 C. TRAVIER TABLE 1 FEL beam requirements. IR Visible XUV X-RAY Wavelength (I£m) 1 - 500 0.1 - 1 0.01 - 0.1 < 0.01 Energy (MeV) 10- 100 100 - 200 200 - 500 > 500 Micropulse length (ps) 1 - 20 1 - 20 1 - 20 1 - 20 Micro. repetition (MHz) 10 - 100 10 - 100 10 - 100 10 - 100 Jitter (ps) <: pulse length Peak current (A) > 20 > 50 > 100 > 200 Norm. emit. (1r mm mrad) 60 - 500 20 - 60 3 - 20 <3 Energy spread (%) < 0.5 < 0.2 < 0.1 < 0.1 Macropulse length (I£S) > 10 > 10 > 10 > 10 distribution. This emittance is equal to the phase space area for a Kapchinskij­ Vladimirskij distribution 4 or to the area of the phase space ellipse which contains around 90% of the particles ("20" emittance") of a beam which distribution is gaussian in each coordinate (x, Px, y, py). The unit is 'IT mm mrad (e.g.: En = 10 'IT mm mrad = 31.4 mm mrad). • the normalized peak brightness defined as B n == 21/(ExnEyn ) where 1 is the peak current and Exn , Eyn are the normalized emittances in both transverse directions. 2.2. Beam requirements Over the recent years, the demand for high-brightness injectors producing very short micropulses has increased. Essentially two types of accelerators require such injectors: linear accelerators for free-electron lasers (FEL) and future high energy linear colliders. 2.2.1. FEL beam requirements Since the first FEL 12 ever "lased" in 1976, there has been a constant growing interest for this new instrument among the scientific community. The performances of an FEL being closely related to those of its driving accelerator, the necessity of very bright electron sources quickly appeared. In this paper, Free Electron Lasers will be classified into four categories according to their wavelength, as shown in Table 1. So far, linac driven FEL have only been operated in infra-red and visible light regimes. It is very difficult to explicit general beam requirements for FEL since these require­ ments depend on the specific design of the electron beam transport system, the undulator and the optical cavity. They also depend on the operating mode of the FEL (eg: oscillator or amplifier). General guidelines can though be given but they have only an indicative value. REVIEW OF MICROWAVE GUNS 37 • The electron beam energy is determined by the laser wavelength in relation with the undulator characteristics. • The micropulse length should be the same as the desired laser pulse length. • The micropulse repetition period needs to be a multiple of the round-trip time in the optical cavity. • The timing jitter between micropulses should be much less than the micropulse length in order to preserve a good synchronism between electron bunches and optical pulses. • The macropulse length is imposed by the time necessary to build-up the oscillations. • The macropulse repetition rate is related to the FEL output power. • High peak current is needed to obtain a high gain and a good extraction efficiency. • The relative energy spread should be less than 1/4N where N is the number of periods of the undulator, in order to assure a good extraction efficiency. An optical gain close to maximum is obtained when there is a spatial overlap of the optical beam and the electron beam through the interaction region. This constraint is fulfilled when the unnormalized transverse emittance is less than the optical wavelength A; this can be written as Cxn,yn :S A{31, where {3 == v / c is the particle velocity and 1 == (1 - (32)-1/2. Crude estimations of the electron beam requirements for the different categories of FEL are given in Table 1. Except for the total energy and the relative energy spread, all these requirements are mainly applying to the injector part of the linac. This statement assumes that emittance is preserved during acceeration in the linac which might not always be absolutely true, especially for high currents. A more detailed description of FEL beam requirements can be found in references. 13, 14, 15, 16, 17 2.2.2. Linear colliders beam requirements Electron-positron colliders with energies much higher than LEP (Large Electron-Positron Collider at CERN) will have to be linear. Therefore a lot of R&D work is underway to find new acceleration schemes. 18 Whatever scheme will require very bright injectors. In the two-beam accelerator proposed by CERN, 19 the drive-linac also needs an injector capable to generate very short intense bunches. 20 For the collider linac, all the requirements at the collision point come from the neces­ sity to obtain a very high luminosity. If such requirements could be met by an electron source, the need for a damping ring could be suppressed. For the drive linac, a very high current is needed to produce the RF power for the collider; the pulse format is determined by the collider operating frequency and filling time. A tentative list of parameters is given in Table 2, for both the collider linac and the drive linac.
Load more

Recommended publications
  • 00307399.Pdf
    + ASI&’rrrativc ActioIs/Eq51dS&MtSUdtyErrqsbyer < This work was supported by the National Cancer Institute, Division of Research Resources and Centers, Department of Health, Education, and Welfare. Edited by Ixruise Taylor, AT Division. DISCLAMER This report was prepared as an account of work sponsored by assagency of the Uruted States &rvcrrrment. Neither the United States Ciovernanerstnor any agency thereof, nor asryof their employru, makes any *anty, express or irnpfied, or assumesany legal liability or responsibility for the accuracy, completeness, or usefulnessof arsyirsfornsation, apparatus, product, or processdisclosed, or represents that its use would not infringe privately owned rights. References herein to any specitlc comnserciat product. process, or aer+ce by trade name, trademark, rnamafacmrer, or otherwise, does not necessady constitute or imply ita errdorsement, recommendation, or favoring by the Urdted States Government or any agency thersof. llte view and opinions of authors expressed herein do not nemsas-ity stare or reflect those of the United States Government or any agency thereof. LA-9144-MS UC-28 and UC-48 Issued: February 1982 . ● / A Linear Accelerator for Radioisotope Production L.D. Hansborough R. W. Harem J. E. Stovall i !-=-—- ‘ - I I . -.... J“’”’ .“ Los Alamos National Laboratory ~~~~la~~s Lo.Alamo.,New.exi..875.~ A LINEAR ACCELERATOR FOR RADIOISOTOPE PRODUCTION by L. D. Hansborough, R. W. Harem, and J. E. Stovall ABSTRACT A 200- to 500-uA source of 70- to 90-MeV protons would be a valuable asset to the nuclear medicine program. A linear accelerator (linac) can achieve this performance, and it can be extended to even higher energies and currents. Variable energy and current options are available.
    [Show full text]
  • Introduction to Accelerators
    Introduction to Accelerators Lecture 4 Basic Properties of Particle Beams William A. Barletta Director, United States Particle Accelerator School Dept. of Physics, MIT US Particle Accelerator School Homework item US Particle Accelerator School From the last lecture US Particle Accelerator School We computed the B-field from current loop with I = constant By the Biot-Savart law we found that on the z-axis I 2 2IR2 B = Rsin d zˆ = zˆ cr2 2 2 3/2 0 cR()+ z What happens if we drive the current to have a time variation? r R US Particle Accelerator School The far field B-field has a static dipole form Importantly the ring of current does not radiate US Particle Accelerator School Question to ponder: What is the field from this situation? r R We’ll return to this question in the second half of the course US Particle Accelerator School Is this really paradoxical? Let’s look at Maxwell’s equations Take the curl of xE Hence US Particle Accelerator School The dipole radiation field: note the similarity to the static dipole US Particle Accelerator School Now on to beams US Particle Accelerator School Beams: particle bunches with directed velocity Ions - either missing electrons (+) or with extra electrons (-) Electrons or positrons Plasma - ions plus electrons Source techniques depend on type of beam & on application US Particle Accelerator School Electron sources - thermionic Heated metals Some electrons have energies above potential barrier Cannot escape + HV Enough energy to escape # of electrons Work function = Electrons in a metal
    [Show full text]
  • Tutorial on Accelerator-Based Light Sources∗
    TUOAS1 Proceedings of 2011 Particle Accelerator Conference, New York, NY, USA A TUTORIAL ON ACCELERATOR-BASED LIGHT SOURCES∗ M. Borland† , ANL, Argonne, IL 60439, USA Abstract light compared to protons, electrons are far easier to ac- celerate to relativistic energies, and hence are preferred Accelerator-based light sources are some of the largest for radiation generation. The first accelerator-generated and most successful scientific user facilities in existence, x-rays were created by the rapid deflection and decel- serving tens of thousands of users each year. These im- eration electrons experience when hitting a metal target portant facilities enable research in diverse fields, includ- (bremsstrahlung radiation). A more controlled technique ing biology, pharmaceuticals, energy conservation and pro- uses a magnetic field to deflect the particle trajectory in a duction, data storage, and archaeology. In this tutorial, circular arc, which produces acceleration at right angles to we briefly review the history of accelerator-based light the direction of motion. sources. We present an overview of the different types of accelerator-based light sources, including a description of For circulating electrons with β 1, radiation is emit- their various operating principles, as well as a discussion of ted in a broad angular pattern at the revolution frequency. measures of performance. Technical challenges of current Radiation is emitted most strongly in the forward and back- and future light sources are also reviewed. ward directions, for which a distant observer sees the great- est acceleration. However, when β ≈ 1 the emitting elec- tron follows closely behind the forward-directed radiation, INTRODUCTION which has β =1.
    [Show full text]
  • A Brief History and Review of Accelerators
    A BRIEF HISTORY AND REVIEW OF ACCELERATORS P.J. Bryant CERN, Geneva, Switzerland ABSTRACT The history of accelerators is traced from three separate roots, through a rapid development to the present day. The well-known Livingston chart is used to illustrate how spectacular this development has been with, on average, an increase of one and a half orders of magnitude in energy per decade, since the early thirties. Several present-day accelerators are reviewed along with plans and hopes for the future. 1 . INTRODUCTION High-energy physics research has always been the driving force behind the development of particle accelerators. They started life in physics research laboratories in glass envelopes sealed with varnish and putty with shining electrodes and frequent discharges, but they have long since outgrown this environment to become large-scale facilities offering services to large communities. Although the particle physics community is still the main group, they have been joined by others of whom the synchrotron light users are the largest and fastest growing. There is also an increasing interest in radiation therapy in the medical world and industry has been a long-time user of ion implantation and many other applications. Consequently accelerators now constitute a field of activity in their own right with professional physicists and engineers dedicated to their study, construction and operation. This paper will describe the early history of accelerators, review the important milestones in their development up to the present day and take a preview of future plans and hopes. 2 . HISTORICAL ROOTS The early history of accelerators can be traced from three separate roots.
    [Show full text]
  • Concept of an Accelerator-Driven Advanced Nuclear Energy System
    Article Concept of an Accelerator-Driven Advanced Nuclear Energy System Xuesong Yan, Lei Yang *, Xunchao Zhang and Wenlong Zhan Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; [email protected] (X.Y.); [email protected] (X.Z.); [email protected] (W.Z.) * Correspondence: [email protected]; Tel.: +86-931-4969-187 Academic Editor: Hiroshi Sekimoto Received: 24 March 2017; Accepted: 10 May 2017; Published: 7 July 2017 Abstract: The utilization of clean energy is a matter of primary importance for sustainable development as well as a vital approach for solving worldwide energy-related issues. If the low utilization rate of nuclear fuel, nuclear proliferation, and insufficient nuclear safety can be solved, nuclear fission energy could be used as a sustainable and low-carbon clean energy form for thousands of years, providing steady and base-load electrical resources. To address these challenges, we propose an accelerator-driven advanced nuclear energy system (ADANES), consisting of a burner system and a fuel recycle system. In ADANES, the ideal utilization rate of nuclear fuel will be >95%, and the final disposal of nuclear waste will be minimized. The design of a high-temperature ceramic reactor makes the burner system safer. Part of fission products (FPs) are removed during the simple reprocessing in the fuel recycle system, significantly reducing the risks of nuclear proliferation of nuclear technology and materials. The ADANES concept integrates nuclear waste transmutation, nuclear fuel breeding, and safety power production, with an ideal closed loop operation of nuclear fission energy, constituting a major innovation of great potential interest for future energy applications.
    [Show full text]
  • Particle Accelerators
    Particle Accelerators By Stephen Lucas The subatomic Shakespeare of St.Neots Purposes of this presentation… To be able to explain how different particle accelerators work. To be able to explain the role of magnetic fields in particle accelerators. How the magnetic force provides the centripetal force in particle accelerators. Why have particle accelerators? They enable similarly charged particles to get close to each other - e.g. Rutherford blasted alpha particles at a thin piece of gold foil, in order to get the positively charged alpha particle near to the nucleus of a gold atom, high energies were needed to overcome the electrostatic force of repulsion. The more energy given to particles, the shorter their de Broglie wavelength (λ = h/mv), therefore the greater the detail that can be investigated using them as a probe e.g. – at the Stanford Linear Accelerator, electrons were accelerated to high energies and smashed into protons and neutrons revealing charge concentrated at three points – quarks. Colliding particles together, the energy is re-distributed producing new particles. The higher the collision energy the larger the mass of the particles that can be produced. E = mc2 The types of particle accelerator Linear Accelerators or a LINAC Cyclotron Synchrotron Basic Principles All accelerators are based on the same principle. A charged particle accelerates between a gap between two electrodes when there is a potential difference between them. Energy transferred, Ek = Charge, C x p.d, V Joules (J) Coulombs (C) Volts (V) Ek = QV Converting to electron volts 1 eV is the energy transferred to an electron when it moves through a potential difference of 1V.
    [Show full text]
  • Particle Accelerator Products for Advanced Research and High-Precision Radiation Therapy Equipment Using Accelerator Technology
    Mitsubishi Heavy Industries Technical Review Vol. 51 No. 3 (September 2014) 54 Particle Accelerator Products for Advanced Research and High-precision Radiation Therapy Equipment using Accelerator Technology Advanced Mechanical Systems Sales & Marketing Group Business Development Department Business Strategy Division Machinery, Equipment & Infrastructure Particle accelerators, which are used for advanced research in fields such as high energy physics and radiation physics, accelerate charged particles (e.g., electrons and protons) to nearly the speed of light at which particles possess high energy. Mitsubishi Heavy Industries, Ltd. (MHI) has provided domestic and overseas research institutions with several types of accelerating cavities or structures, which are the heart of an accelerator. We are also internally developing state-of-the-art accelerator manufacturing technologies. The ultra-compact accelerating structure we have thus developed is mounted on our Vero4DRT high-precision radiation therapy equipment (marketed under the MHI-TM2000 Linear Accelerator System brand name). This report introduces our superconducting accelerating cavities, normal-conducting accelerating structures and radiation therapy equipment as applied products thereof. |1. Superconducting accelerating cavities 1.1 Features Superconducting accelerating cavities can lower electrical resistance to nearly zero by cooling the niobium constituting the cavities down to an extremely low temperature by using of refrigerants such as liquid helium and thereby achieving superconductivity.
    [Show full text]
  • Linear Accelerator for Radioisotope Production
    LA-9144-MS LA-—9144-MS UC-28 and UC-48 Issued: February 1982 DE82 00 9551 A Linear Accelerator for Radioisotope Production L. D. Hansborough R. W. Hamm J. E. Stovail t Los Alamos National Laboratory Los Alamos, New Mexico 87545 A LINEAR ACCELERATOR FOR RADIOISOTOPE PRODUCTION by L. D. Hansborough, P.. W. Harnm, and J. E. Stovall ABSTRACT A 200- to 500-MA source of 70- to 90-MeV protons would be a valuable asset to the nuclear medicine program. A linear accelerator (linac) can achieve this performance, and it can be extended to even higher energies and currents. Variable energy and current options are available. A 70-MeV linac is described, based on recent innovations in linear accelerator technology; it would be 27.3 m long and cost ~?6 million. By operating the radio-frequency (rf) power system at a level necess.-.ry to produce a 500-uA bedm current, the cost of power deposited in the radioisotope- production target is comparable with existing cyclotrons. If the rf-power system is operated at full power, the same accelerator is capable of producing an 1140-uA beam, and the cost per beam watt on the target is less than half that of comparable cyclotrons. I. MEDICAL RADIOISOTOPE PRODUCTION Nuclear medicine is a major medical specialty that provides noninvasive, cost-effective, dynamic-function information that is clinically useful in diag¬ nosing human diseases. Reactors have produced radioactive isotopes of practi¬ cally every element. Clever techniques have been developed for recovering the high specific-activity products from uranium fission (Mo, I, and ^Xe) and from fast-neutron-induced (n,p) and (n,a) reactions ( K, Mn, Co, Cu, 132 Cs, etc.).
    [Show full text]
  • Evidence Report: Risk of Acute and Late Central Nervous System
    Risk of Acute (In-flight) or Late Central Nervous System Effects from Radiation Exposure Evidence Report: Risk of Acute and Late Central Nervous System Effects from Radiation Exposure Human Research Program Space Radiation Program Element Approved for Public Release: April 6, 2016 National Aeronautics and Space Administration Lyndon B. Johnson Space Center Houston, Texas 1 Risk of Acute (In-flight) or Late Central Nervous System Effects from Radiation Exposure CURRENT CONTRIBUTING AUTHORS: Gregory A. Nelson Loma Linda University/ NASA IPA NASA Johnson Space Center, Houston, TX Lisa Simonsen NASA Langley Research Center, Hampton, VA Janice L. Huff Universities Space Research Association, Houston, TX PREVIOUS CONTRIBUTING AUTHORS: Francis A. Cucinotta NASA Johnson Space Center, Houston, TX Janice L. Huff Universities Space Research Association, Houston, TX Myung-Hee Y. Kim Universities Space Research Association, Houston, TX Janapriya Saha Universities Space Research Association, Houston, TX Minli Wang Universities Space Research Association, Houston, TX Frank M. Sulzman Universities Space Research Association, Houston, TX Reference for original report: Human Health and Performance Risks of Space Exploration Missions, (Jancy C. McPhee and John B. Charles, editors), NASA SP-2009- 3405, 2009. Slack KJ, Shea C, Leveton LB, Whitmire AM, Schmidt LL (2009) Risk of Behavioral and Psychiatric Conditions In: McPhee JC, Charles JB (eds) Human Health and Performance Risks of Space Exploration Missions, NASA SP-2009-3405 2 Risk of Acute (In-flight) or Late Central Nervous System Effects from Radiation Exposure TABLE OF CONTENTS: I. PRD RISK TITLE: RISK OF ACUTE (IN-FLIGHT) AND LATE CENTRAL NERVOUS SYSTEM EFFECTS FROM RADIATION EXPOSURE ........................... 5 II. EXECUTIVE SUMMARY ................................................................................................
    [Show full text]
  • An Introduction to an Introduction to Particle Accelerators
    An Introduction to Particle Accelerators Erik Adli,, University of Oslo/CERN November, 2007 [email protected] v1.32 References • Bibliograp hy: – CAS 1992, Fifth General Accelerator Physics Course, Proceedings, 7-18 September 1992 – LHC Design Report [online] – K. Wille, The Physics of Particle Accelerators, 2000 • Other references – USPAS resource site, A. Chao, USPAS January 2007 – CAS 2005, Proceedings (in-print), J. Le Duff, B, Holzer et al. – O. Brüning: CERN student summer lectures – N. Pichoff: Transverse Beam Dynamics in Accelerators, JUAS January 2004 – U. Am aldi, presentation on Hadron therapy at CERN 2006 – Various CLIC and ILC presentations – Several figures in this presentation have been borrowed from the above references, thanks to all! Part 1 Introduction Particle accelerators for HEP •LHC:theworld: the world biggest accelerator, both in energy and size ((gas big as LEP) •Under construction at CERN today •End of magnet installation in 2007 •First collisions expected summer 2008 Particle accelerators for HEP The next big thing. After LHC, a Linear Collider of over 30 km lengg,th, will probably be needed (why?) Others accelerators • Histor ica lly: t he ma in dr iv ing force o f acce lerator deve lopment was collision of particles for high-energy physics experiments • However, today there are estimated to be around 17 000 particle accelerators in the world, and only a fraction is used in HEP • Over half of them used in medicine • Accelerator physics: a disipline in itself, growing field • Some examples: Medical applications • Therapy – The last decades: electron accelerators (converted to X-ray via a target) are used very successfully for cancer therapy) – Todayyp's research: proton accelerators instead (hadron therapy): energy deposition can be controlled better, but huge technical challenges • Imaging – Isotope production for PET scanners Advantages of proton / ion-therapy (() Slide borrowed from U.
    [Show full text]
  • Accelerator Physics for Health Physicist by D. Cossairt
    Accelerator Physics for Health Physicists J. Donald Cossairt Ph.D., C.H.P. Applied Scientist III Fermi National Accelerator Laboratory 1 Introduction • Goal is to improve knowledge and appreciation of the art of particle accelerator physics • Accelerator health physicists should understand how the machines work. • Accelerators have unique operational characteristics of importance to radiation protection. – For their own understanding – To promote communication with accelerator physicists, operators, and experimenters • This course will not make you an accelerator PHYSICIST! – Limitations of both time and level prescript that. – For those who want to learn more, academic courses and the U. S. Particle Accelerator School provide much comprehensive opportunities. • Much of the material is found in several of the references. – Particularly clear or unique descriptions are cited among these. 2 A word about notation • Vector notation will be used extensively. – Vectors are printed in italic boldface (e.g., E) – Their corresponding magnitudes are shown in italics (e.g., E). • Variable names generally will follow the published literature. • Consistency has not been achieved. – This author cannot fix that by himself! – Chose to remain close to the literature – Watch the context! 3 Summary of relativistic relationships including Maxwell’s equations • Special theory of relativity is important. • Accelerators work because of Maxwell’s equations. •Therest energy of a particle Wo is connected to its rest mass mo by the speed of light c: 2 Wmcoo= (1) • Total energy W of a particle moving with velocity v is 2 22mco W 1 Wmc== =γ mco γ == , (2) 2 2 1− β , with Wo 1− β β = v/c, m is the relativistic mass, and γ is the relativistic parameter.
    [Show full text]
  • Development of Accelerator Driven Advanced Nuclear Energy And
    10th Int. Particle Accelerator Conf. IPAC2019, Melbourne, Australia JACoW Publishing ISBN: 978-3-95450-208-0 doi:10.18429/JACoW-IPAC2019-TUYPLS2 DEVELOPMENT OF ACCELERATOR DRIVEN ADVANCED NUCLEAR ENERGY (ADANES) AND NUCLEAR FUEL RECYCLE* Yuan He†, Zhiguang Wang, Zhi Qin, Hushan Xu††, Lei Yang, Zhijun Wang, Junhui Zhang, Xueying Zhang, Long Gu, Wenlong Zhan1 Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou, China 1 also at Chinese Academy of Sciences (CAS), Beijing, China Abstract Uranium become the key issues on the way of the sustain- able development of fission nuclear. The accelerator driven The proposed Accelerator Driven Advanced Nuclear En- sub-critical reactor (ADS) and the fast reactor system (FR) ergy System (ADANES) is a new closed nuclear energy were proposed to transmute the minor actinides. The parti- cycle system, aimed at improving the utilization rate of nu- tion-transmutation strategy was known as the most effi- clear fuels, enhancing nuclear safety, reducing the nuclear cient way to reduce the radiotoxicity of nuclear spent fuel proliferation, and at becoming a sustainable and low-car- (NSF). It was reported by NEA/OECD in 2002 that the bon energy supply for thousands of years. The ADANES ADS is advantage that it can burn pure minor actinides system consists of fuel burner like the Accelerator Driven while avoiding a deterioration of the core safety character- System (ADS), used nuclear fuel processing and recycle istics [2]. In Europe, an ADS project MYRRHA as in system. Several prototypes have been made as the devel- Multi-purpose hYbrid Research Reactor for High-tech Ap- opment of key technology R&D.
    [Show full text]