Archives - Page 2

  • Linear Collider Sub-Systems
    No. 54 (2011)

    Issue Editor: J. Gao, Editor-in-Chief: W. Chou

    The editor of this issue is Prof. Jie Gao, a panel member and a senior scientist at IHEP, China. Jie collected a number of excellent review articles in the theme sections 2–4 on three important linear collider subsystems—the positron source, the damping rings and the final focus test facility. 
    In this issue, in contrast to No. 32, instead of focusing on accelerator structures, we present material on three key subsystems of the ILC: the polarized positron source, the damping rings and the final focus system (ATF2). These elements are challenged by the design goal requirements, for example, a highly polarized positron beam, and extreme low emittance and extreme small beam size at the IP. Thanks to the three ILC TDR subsystem chairpersons, we have been able to collect high level articles, reflecting the state of the art of the corresponding fields. In the remaining part of this issue, we provide laboratory reports from different accelerator laboratories, mainly from China this time.

     

  • Accelerator Activities in Russia
    No. 53 (2010)

    Issue Editors: S. Ivanov and Y. Shatunov, Editor-in-Chief: W. Chou

    The editors of this issue are Drs. Sergey Ivanov (IHEP, Russia) and Yuri Shatunov (BINP, Russia), both panel members. They took on the editing job at short notice as the original editor of this issue was unavailable. Sergey and Yuri did a great job and collected 20 articles in the theme section―Accelerator Activities in Russia. Russia has a remarkable history of important inventions and innovations in the accelerator field: RFQ, electron cooling, H–injection, Siberian snakes, gamma-gamma collider―to name but a few. These theme articles give a comprehensive review of a variety of accelerator projects and current activities in that country.

  • Current Beam-Beam Problems
    No. 52 (2010)

    Issue Editor: W. Fischer, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Wolfram Fischer, a panel member and an accelerator scientist at Brookhaven National Laboratory, USA. Wolfram collected 16 well-written articles in the theme section―Current Beam-Beam Problems. These articles give a comprehensive review of this important and challenging beam dynamics problem.

  • Accelerator Science and Technology in the UK
    No. 51 (2010)

    Issue Editor: S. Chattopadhyay, Editor-in-Chief: W. Chou

    The editor of this issue is Prof. Swapan Chattopadhyay, a panel member and director of the Cockcroft Institute, UK. Swapan collected 29 excellent articles in the theme section―Accelerator Science and Technology in the UK. These articles give a comprehensive review of a variety of accelerator projects and activities in that country, covering a wide spectrum including particle and nuclear physics, photon science, neutron science, test facilities and accelerator systems R&D, advanced accelerator R&D and new initiatives, applications to energy, health and security, and industrial engagement.

  • ILC R&D Status
    No. 50 (2009)

    Issue Editor: J. Urakawa, Editor-in-Chief: W. Chou

    The editor of this issue is Prof. Junji Urakawa, a panel member and senior physicist from KEK. Junji is the leader of the ATF Project of KEK. He chose ILC R&D Status as the theme of this newsletter and collected 10 excellent articles in the theme section. They give a comprehensive review of the status and future plans of the ILC, a leading candidate for the next large particle collider.

  • Accelerator Driven Sub-Critical Assemblies (ADS) and its challenge to accelerators
    No. 49 (2009)

    Issue Editor: J. Wang, Editor-in-Chief: W. Chou

    The editor of this issue is Prof. Jiuqing Wang, a panel member and Deputy Director of IHEP, China. Jiuqing chose Accelerator Driven Sub-Critical Assemblies (ADS) as the theme of this newsletter. This is a topic that could have a deep impact on the future of our society. As we all know, developing clean energy and protecting the environment are two top priorities in countries around the world. ADS is an accelerator-based technology that may provide a viable solution to these major problems. Jiuqing collected 6 excellent articles in the newsletter theme section. They give a comprehensive review of this important accelerator field, including valuable lessons.
    learned from the past. 

  • e+e- Colliders
    No. 48 (2009)

    Issue Editor: M.E. Biagini, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Marica Biagini, a panel member and a senior scientist from LNF-INFN, Italy. Marica collected 27 excellent articles in the theme section “e+ e− Colliders: Past and Present Experiences and Future Frontiers.” These articles give a comprehensive review of this very important accelerator field by experts from all over the world. It will no doubt serve as a valuable reference for every accelerator physicist who works or plans to work on e+ e− colliders. The total number of pages in this issue approaches 300, a record number for this newsletter. This is a reflection of strong interest and vigorous activity in the lepton energy frontier.

  • Control Systems
    No. 47 (2008)

     Editor-in-Chief: W. Chou, Issue Editor: I.S. Ko

    The editor of this issue is Prof. In Soo Ko, a panel member and a senior scientist from POSTECH, South Korea. In Soo collected 10 excellent articles in the theme section “Control Systems.” As In Soo pointed out, control systems are often neglected or ignored by accelerator physicists because it is a highly specialised field. These articles, all written by leading experts in this field, can serve as an introductory text to accelerator control systems.

  • Electron Guns
    No. 46 (2008)

    Editor-in-Chief: W. Chou, Issue Editor: M.A. Furman

    The editor of this issue is Dr. Miguel Furman, a panel member and a scientist from LBL, U.S.A. Dr. Furman collected 10 comprehensive and well-written articles in the theme section “Electron guns.” There is also a nice article on the Super-B factory, an HEP project of high priority in Europe as well as in Asia. This newsletter has over 200 pages and contains valuable scientific information. Miguel spent a significant amount of time on editing.

  • Wakefields and Instabilities
    No. 45 (2008)

    Issue Editor: R. Wanzenberg, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Rainer Wanzenberg, a panel member and a scientist from DESY, Germany. Dr. Wanzenberg collected a number of fine articles for this issue. Among them, the ten articles under the theme of “wakefields and instabilities” are well-prepared and valuable contributions to our field.

  • Linear Optics from Closed Orbits
    No. 44 (2007)

    Issue Editor: A. Ghodke, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Ajay Ghodke, a panel member and a senior scientist from the Raja Ramanna Centre for Advanced Technology (RRCAT) in Indore, India. Dr. Ghodke collected a number of very interesting articles for this issue. The total page count reaches 230 making this the largest single volume of this newsletter that has been assembled.

  • FFAG Accelerators
    No. 43 (2007)

    Issue Editor: C.R. Prior, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Chris Prior, a panel member and a senior scientist from the Rutherford Appleton Laboratory, England. Dr. Prior has assembled 14 excellent articles on FFAGs. This is a record number for the theme section of this newsletter.

  • Free Electron Lasers
    No. 42 (2007)

    Issue Editor: Y. Cai, Editor-in-Chief: W. Chou

    The editor of this issue is Dr. Yunhai Cai, a panel member and a scientist from
    SLAC.

  • Benchmarking of Simulation Codes
    No. 41 (2006)

    Issue Editor: I. Hofmann, Editor-in-Chief: W. Chou

    The Editor of this issue is Prof. Ingo Hofmann, a panel member from the GSI, Germany. He is an internationally well-known expert in the study of collective effects and has collected a number of well-written articles in the theme section of Recent Work on Benchmarking of Simulation Codes. 

  • Accelerators in Asia
    No. 40 (2006)

    Issue Editor: J. Wang, Editor in Chief: W. Chou

    To choose the theme of this issue, I consulted with Weiren Chou. We decided to focus on accelerators in Asia, since interest there is high and progress is rapid. Thanks to the enthusiasm of the contact persons, I received 9 papers from countries including Australia, China, India, Japan, Korea and Singapore. They are arranged in sequence: e+e− high luminosity factories, light sources, proton and heavy ion accelerators. I had expected more articles in this theme issue, but some of the potential authors were too busy and may submit papers to future issues. And also I noticed that some new projects in this area have already been reported in recent BD newsletter issues. However, I hope that papers collected here can be representative and somewhat reflect the flourishing activities on accelerator based scientific research in Asia.

    This issue contains a section dedicated to the International Linear Collider (ILC). This includes an article from Barry Barish, Director of the GDE, a report on the international accelerator school for linear colliders held 19–27 May in Hayama, Japan, and a report on ILC accelerator related R&D activities in IHEP, Beijing.

    I have received three workshop and conference reports: one about the 37th ICFA Beam Dynamics Workshop on Future Light Sources, one about the mini-workshop on CSNS (Chinese Spallation Neutron Source) accelerator Engineering Design and one about the OCPA (Overseas Chinese Physics Association) accelerator school.

    I appreciate very much the high quality of the papers from all the contributors. Finally, I want to thank Ms. Shan Liu, secretary of the accelerator division of IHEP, for her professional editing of the whole issue.

  • Pushing the limits of RF superconductivity
    No. 39 (2006)

    Issue Editor: K. J. Kim, Editor-in-Chief: W. Chou

    The theme papers in this issue are from the Workshop on Pushing the Limits of RF Superconductivity held at Argonne National Laboratory on September 22–24, 2004. The workshop was special because, although it was planned well before, it took place just a few days after the International Technology Review Panel made its historic recommendation that the superconducting RF technology be the basis of the International Linear Collider (ILC).

    The interest in SCRF goes beyond the ILC—the technology is the basis for other major accelerator projects such as the Spallation Neutron Source and the Rare Isotope Accelerator, and future light sources such as energy recovery linacs and x-ray free-electron lasers. Pushing the limits in accelerating gradient and Q is critically important for all these accelerators in reducing their size, construction cost, and operating budgets—in short, in making them affordable.

    I believe that it is worthwhile to collect these papers by leading experts in the theme section of this Newsletter due to the importance of the topic and because the proceedings of the Workshop containing the original versions of these papers was not widely circulated. In addition, a majority of the papers here have been revised to incorporate further developments since the Workshop at Argonne. I thank the authors of these papers for their additional efforts in updating their papers.

  • Bunch compressors, important parts of the linac-based free electron laser (FEL) and the International Linear Collider (ILC)
    No. 38 (2005)

    Issue Editor: I. S. Ko, Editor-in-Chief: W. Chou

    1. In this Newsletter, there is a special session dedicated to the electron bunch compression. This topic becomes very important in the field of linac-based free electron lasers and eventually ILC linac as well. Detailed mechanism of electron bunch length compression is covered by M. Dohlus and T. Limberg of DESY, and P. Emma of SLAC. Microbunching instability due to bunch compression which degrades FEL lasing is described by Z. Huang and J. Wu of SLAC, and T. Shaftan of BNL. I thank all authors for their contributions to this issue of Newsletter. I miss the third article on the bunch compression scheme for ILC that was not submitted on time. It will appear in the next issue of the Nesletter.

      In the ILC section, we have a detailed plan for ILC School scheduled on May 19-27, 2006 at Sokendai, Hayama, Japan.

      There are several activity reports including one from South Africa. We have an excellent and rare chance to hear voices from African physicists. One interesting issue is a suggestion of the creation of International Science Center including African Synchrotron Radiation Facility, which reminds me SESAME project.

  • Cyclotrons and polarization
    No. 37 (2005)

    Issue Editor: R. Wanzenberg, Editor-in-Chief: W. Chou

    First and foremost I would like to thank all the authors of the contributions to this issue of the newsletter. This newsletter begins with a letter to the Editor by S. A. Khan reflecting on anniversaries celebrated last year, and looking ahead to the extension of international collaboration on accelerators and beam physics as well as to new regional facilities.

    There is a dedicated section on recent activities related to the global effort towards a linear collider. The “Second ILC Accelerator Workshop” will be held in Snowmass, Colorado, August 14-27, 2005. Reports from that workshop are expected for the next issue of this newsletter in December.

    This issue contains two theme sections on cyclotrons and on polarized beams. Cyclotrons have not been in the focus in recent issues of the newsletter although many cyclotrons are operated worldwide for different purposes. These include medical applications, nuclear physics and the operation of a spallation neutron source. The contributions to this topic, received from different regions of the world, demonstrate that cyclotrons are interesting with respect to beam dynamics, which includes not only aspects of beam optics but also three-dimensional modeling of complicated accelerator structures and space charge dominated beams. I am particularly pleased by receiving an article by IJ. L. Conradie from South Africa, which reports new beam developments in the iThemba Labs (see Section 4.4).

    The section on polarization covers achievements with respect to polarized beams as well as recent progress in spin-orbit tracking codes. The Cooler Synchrotron COSY is accelerating polarized proton and deuteron beams up to a momentum of 3.7 GeV/c. The attainment and handling of spin polarization of electron and positron beams has a long tradition at DESY. Presently longitudinal polarized electrons of energy of 27.5 GeV are delivered to three HERA experiments. RHIC has shown an impressive increase in polarized proton (100 GeV) performance over the last few years.

    There are interesting and well-written activity reports on beam-beam effects, a longitudinal feedback system and on coherent synchrotron radiation effects in bunch compressors.

    There are several workshop and conference reports, including a well-prepared comprehensive report of the ERL2005.

    The forthcoming beam dynamics workshops can be found in section 8 of this newsletter.

    Last but not least I would like report that Dr. Anton Piwinski, one of the founders of this newsletter, has received the USPAS Prize for his achievements in accelerator physics and technology.

  • CLIC, ion sources, RFQ drift-tube proton linac, beam halo study, multi-turn extraction, stochastic slow extraction, proton therapy facility, RAL front end test stand and plane wave transformer linac, etc.
    No. 36 (2005)

    Issue Editor: A.M. Lombardi, Editor-in-Chief: W. Chou

    Issues linked to high intensity proton machines constitute the main theme of this beam dynamics newsletter. In particular, I have collected articles on the less-known mechanisms of intensity limitation as well as the most astute tricks to overcome them. This issue also contains a complete overview of particle sources. Sources, too often forgotten or taken for granted, are really the first stage of acceleration where the initial beam emittance and distribution of particles within the beam are determined. The theme section also contains a description of the beam dynamics in a new “mixed” structure (the Radio Frequency Quadrupole-Drift Tube Linac), a promising structure for the early stages of acceleration. Finally a report on an application of hadron acceleration to medical machines closes the section.

    This issue contains a section dedicated to linear collider with a message from Barry Barish, the newly appointed Director of the International Linear Collider Global Design Effort. In addition there is a report on the CLIC test facility.

    I have received two activity reports: a contribution on the upcoming test stand facility for the high intensity pulsed proton beam at Rutherford Laboratories and a preliminary report on the ever-expanding accelerator activities in India from our regular correspondent S. Krishnagopal.

    A comprehensive summary of the issues discussed at HB2004 together with the announcement of three upcoming ICFA workshops complete the issue.

  • Coherent synchrotron radiation (CSR)
    No. 35 (2004)

    Issue Editor: C. Biscari, Editor-in-Chief: W. Chou

    We have dedicated the special theme of this issue to the CSR in storage rings. Theory, simulations, experimental results, diagnostics and proposals for new facilities are presented, together with an interesting overview on the utilization of the CSR produced in BESSY.

    I have received with great pleasure Prof. Teng’s autobiography and his historical overview of half a century of the accelerator physics in which he has always played the leading role.

    Two young scientists participating to the SESAME synchrotron light source project have written a general report on their beam dynamics activities. SESAME is a wide scientific collaboration in the Asian Middle East area, born under UNESCO aegis, and leaded by Gaetano Vignola. It is now in the construction phase.

    Interesting is also the description of the small electron ring at Maryland University. This is an example of how this Newsletter can be used as communication means by the small and medium size facilities, where often new ideas and concepts can be easily produced and tested.

    I repeat here Weiren’s invitation to contribute to the newly founded Newsletter ILC section, and I present the first contribution related to the first official meeting of the entire Linear Collider community, held in November 2004 at KEK.

    Finally I want to thank Pina Possanza, secretary of the Divisione Acceleratori of LNF, for her professional editing of the whole issue.

  • Beam-beam interactions
    No. 34 (2004)

    Issue Editor: D. Rice, Editor-in-Chief: W. Chou

    The recent decision and widespread endorsement of the Linear Collider ITRP is a vitally important milestone in accelerator development, not only in paving the way for the next stages of R&D work, but also as an indicator of the level of interlaboratory and international cooperation. Included in this newsletter are comments from ICFA BDP Chair Weiren Chou (above), ILCSC Chair Maury Tigner, the Executive summary of the ITRP, and links to more detailed information.

    This issue of the ICFA Beam Dynamics Newsletter also has a special section on beam-beam interactions. Throughout the history of colliding beam machines the beam- beam interaction has been one of the most critical phenomena in determining machine performance, yet at the same time one of the least understood.

    Advances in computing power and program algorithms have played a large role in our increased understanding of the results of the beam-beam interaction. The simulations are supported by improvements in analytical treatment, both by providing a physical explanation for tracking and measurement results, and by making the tracking algorithms faster and more realistic.

    Several machines now operate with significant parasitic crossings - from two to 89. These parasitic crossings can easily limit performance, as has been found in CESR and the Tevetron (see paper by T. Sen). Some machines operate with strong sextupoles and wigglers, adding more lattice nonlinearities to be considered. Including these effects in tracking codes pushes again the need for faster and/or parallel machines (see paper by J. Qiang).

    I would like to thank the authors for their excellent work in research and preparation of the papers included in this newsletter.

    Following the beam-beam papers are reports from the Workshop on the Physics of Seeded FEL’s, the Workshop on XFEL Short Bunch Measurements and Timing, and a status report from the Working Group on Remote Experiments in Accelerator Physics.

  • Electron cloud effects and advanced and novel accelerators
    No. 33 (2004)

    Issue Editors: K.Ohmi and M. Furman, Editor-in-Chief: W. Chou

    In this issue of the ICFA Beam Dynamics Newsletter, we have a special section (Section 2) dedicated to electron cloud effects in accelerators. Electron cloud effects were first studied in proton rings. Ion trapping and fast ion instability came later. Photoelectron emission due to synchrotron radiation became an important issue in positron rings during the past 10 years or so. Secondary electrons and multipactoring became important with increasing beam intensities. In the present concept of the electron cloud, many electrons are produced at the chamber wall and are widely distributed inside the chamber. Recently, electron cloud studies returned to proton rings. By now, many studies have been done in many types of accelerators, namely in positron storage rings (B-factories and damping rings of the LC’s), high intensity neutron sources (PSR, SNS and J-PARC), and high-energy hadron machines (RHIC and LHC). The electron cloud causes various types of instabilities and other undesirable phenomena. There are still many aspects to be studied on electron cloud effects. We hope, as editors, that this issue helps readers understand electron cloud effects and their importance.

    Section 3 of this Newsletter contains a number of well written articles contributed by the ICFA Advanced and Novel Accelerators Panel. (Another set of articles from that Panel were published in the last issue, No. 32.)

  • Accelerating structures of linacs for future electron-positron linear colliders
    No. 32 (2003)

    Issue Editor: J. Gao, Editors-in-Chief: W. Chou and J.M. Jowett

    Since 1995 the newsletter has been published at a rather constant rhythm of three issues per year (there was a break in publication of about four years before the newsletter was revived by the editors of No. 7). Some recent issues have been quite a bit thicker and contained more detailed material than the earlier ones.

    Accelerating structures of linacs for future electron-positron linear colliders, which is one of the main axes of research efforts of international particle accelerator community, have been chosen as the main subject of this issue. Reports from TESLA, GLC, NLC and CLIC reflect their state-of-the-art technological advances and challenges. As contra-balance, we have invited ICFA Panel on Advanced and Novel Accelerators headed by Dr. W. Leemans to provide us information on the progresses of advanced and novel accelerating possibilities, which are not the simple extrapolations from the well known particle accelerating technologies (in this issue we publish the first part of the contributions, and the second part will be appeared in the next issue). As a pivot, we have collected reports from the workshops focused mainly on the problems in storage ring colliders, which represent the main powerful operational facilities for the particle physics researches of our community nowadays. It is with the above mentioned global view that authors are invited, contributions are structured and presented. Finally, I hope, as editor, that readers of this issue benefit not only from the single contribution effect, but also from the global collective effect of this issue.

  • High-Luminosity e+e- Colliders
    No. 31 (2003)

    Issue Editor: Y. Funakoshi, Editors-in-Chief: W. Chou and J.M. Jowett

    In this issue of the ICFA Beam Dynamics Newsletter, we have a special section on the high luminosity e+e– colliders. To focus discussions on common issues among the machines, we confined ourselves to issues of circular colliders. In this field, the Working Group on High Luminosity e+e– Colliders, chaired by C. Biscari at LNF, has been formed within the Beam Dynamics Panel and has been playing an important role. This issue aims at giving a reference or a basis for further discussions in future in this field. Also this issue includes some outcomes of the working group such as a database on machine parameters of each machine. A motivation of the editor of this issue consists in summing up our present knowledge of the most critical issues in these colliders from the viewpoint of beam dynamics, together with giving clear views of the present status of each machine and its future plan.

     

  • Electron-Ion Colliders
    No. 30 (2003)

    Issue Editors: Jie Wei and Lia Merminga, Editors-in-Chief: Weiren Chou and John M. Jowett

    This issue of the ICFA Beam Dynamics Newsletter has been edited in a collaboration between Dr Jie Wei of Brookhaven National Laboratory and Dr Lia Merminga of Jefferson Lab. They have chosen the special theme of Electron-Ion Colliders. Regular readers will have noticed a small change in our editorial policy. In view of the continually shifting composition of the editorial team, it no longer makes much sense to list a half-dozen or so editors on the front cover. From now on, only the editors who compiled the current issue will be listed, together with the editors-in-chief who maintain overall continuity. Any member of the Beam Dynamics Panel may edit an issue, possibly in collaboration with other colleagues. The next issue will be edited by Dr Y. Funakoshi of KEK and will feature the topic of High Luminosity e+e– colliders.

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