International Committee for Future Accelerators Sponsored by the Particles and Fields Commission of IUPAP Beam Dynamics Newsletter No. 47 Issue Editor: I. S. Ko Editor in Chief: W. Chou December 2008 3 Contents 1 FOREWORD........................................................................................................11 1.1 FROM THE CHAIR ....................................................................................................11 1.2 FROM THE EDITOR ..................................................................................................12 2 LETTERS TO THE EDITOR – IN MEMORY OF ROBERT H. SIEMANN14 2.1 ROBERT H. SIEMANN – ENCOUNTERS AND ESSAYS ................................................14 2.1.1 Introduction ..................................................................................................14 2.1.2 Numerous Encounters ..................................................................................14 2.1.3 Memorial Essays ..........................................................................................17 2.1.4 References ....................................................................................................17 2.2 REMEMBERING BOB SIEMANN AS AN EARLY MENTOR ...........................................18 2.3 BOB SIEMANN AND MESON PRODUCTION BY POLARIZED PHOTONS .......................19 2.3.1 Introduction ..................................................................................................19 2.3.2 Polarization Dependence of Meson Photoproduction ..................................20 2.3.3 Construction, Characterization, and Use of the SLAC Polarized Photon Beamline.......................................................................................................22 2.3.4 References ....................................................................................................22 2.4 MEMORIES OF A MENTOR AND FRIEND – ROBERT H. SIEMANN ..............................23 2.4.1 Introduction ..................................................................................................23 2.4.2 Cornell Years................................................................................................23 2.4.3 Fermilab Sabbatical ......................................................................................25 2.4.4 Lasting Mentor and Friend ...........................................................................25 2.5 ROBERT H. SIEMANN: A PERSONAL TRIBUTE .........................................................26 2.6 IN MEMORY OF ROBERT SIEMANN..........................................................................29 2.7 SLC DAYS AT SLAC ..............................................................................................30 2.8 ESSAY FOR ROBERT H. SIEMANN............................................................................32 2.9 ROBERT H. SIEMANN AS LEADER OF AARD...........................................................33 2.9.1 Introduction ..................................................................................................33 2.9.2 Scientist, Colleague, and Collaborator .........................................................34 2.9.3 Professor .......................................................................................................34 2.9.4 Mentor .. .......................................................................................................35 2.9.5 Administrator................................................................................................35 2.9.6 Hobbyist .......................................................................................................35 2.9.7 Conclusion....................................................................................................36 4 2.10 SIEMANN TRIBUTE ..................................................................................................36 References ..............................................................................................................37 2.11 BOB SIEMANN’S CONTRIBUTIONS TO ADVANCED ACCELERATORS – A PERSONAL PERSPECTIVE...........................................................................................................38 References ..............................................................................................................40 2.12 BOB SIEMANN AND THE SPALLATION NEUTRON SOURCE: A REMEMBRANCE.........40 2.13 BOB SIEMANN AND PRST-AB ................................................................................42 2.14 HANDS ACROSS THE ATLANTIC ...............................................................................44 3 INTERNATIONAL LINEAR COLLIDER (ILC)............................................46 3.1 THIRD INTERNATIONAL ACCELERATOR SCHOOL FOR LINEAR COLLIDERS..............46 4 THEME SECTION: CONTROL SYSTEMS....................................................49 4.1 ACCELERATOR CONTROL SYSTEMS – A PERSONAL RECOLLECTION .......................49 4.1.1 Introduction...................................................................................................49 4.1.2 The TRIUMF Years......................................................................................49 4.1.3 A Community ...............................................................................................50 4.1.4 Collaboration - EPICS ..................................................................................51 4.1.5 The SSC ........................................................................................................52 4.1.6 The SNS........................................................................................................53 4.1.7 Conclusions...................................................................................................55 4.2 EPICS – EXPERIMENTAL PHYSICS AND INDUSTRIAL CONTROL SYSTEM.................56 4.2.1 Brief History .................................................................................................56 4.2.2 Architecture ..................................................................................................56 4.2.3 Process Database ..........................................................................................58 4.2.3.1 Record Processing..........................................................................58 4.2.3.2 Hardware Support ..........................................................................58 4.2.4 Software Interfaces .......................................................................................59 4.2.4.1 Driver Layer Interface....................................................................59 4.2.4.2 Record Type Support ......................................................................59 4.2.4.3 Channel Access Client Interface.....................................................60 4.2.4.4 Hardware Platforms.......................................................................60 4.2.5 Channel Access Clients and Operator Tools ................................................60 4.2.5.1 Services: Archiving.........................................................................61 4.2.5.2 Services: Alarming .........................................................................61 4.2.5.3 Services: Logging ...........................................................................61 4.2.5.4 Operator Tools: X-Window/Motif Based Applications ..................61 4.2.5.5 Operator Tools: Java Based Applications......................................61 4.2.6 Applications & Their Requirements.............................................................61 4.2.7 Robustness and Reliability ...........................................................................62 4.2.7.1 Robustness ......................................................................................62 4.2.7.2 Reliability........................................................................................63 5 4.2.7.3 Redundancy ....................................................................................63 4.2.8 Current Plans ................................................................................................63 4.2.8.1 EPICS Core: Java IOC ..................................................................63 4.2.8.2 New Directions in Channel Access ................................................64 4.2.8.3 Operator Tools ...............................................................................64 4.2.8.4 Web Based Applications.................................................................64 4.2.8.5 Services...........................................................................................65 4.2.9 Industrial Support .........................................................................................65 4.2.10 The EPICS Collaboration...............................................................65 4.2.11 Conclusions ....................................................................................66 4.2.12 References ......................................................................................66 4.3 THE TANGO CONTROL SYSTEM.....................................................................66 4.3.1 History ..........................................................................................................66 4.3.2 TANGO Philosophy .....................................................................................67 4.3.3 CORBA ........................................................................................................67