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ОбложкаBeam dynamics newsletter. 74. - [S. l.]: ICFA, 2018. - 212 p.: ill., tab.
Шифр: (И/В38-И34/74) 02

 

Место хранения: 02 | Отделение ГПНТБ СО РАН | Новосибирск

Оглавление / Contents
 
1    FOREWORD ................................................... 7
     From the Chair ............................................. 7
     From the Editor ............................................ 8

2    THE ELECTRON-ION COLLIDER (EIC) ........................... 10
2.1  The Electron Ion Collider Science ......................... 10
     2.1.1  Introduction ....................................... 10
     2.1.2  The Secrets of Nucleons and Nucleilntroduction ..... 11
     2.1.3  The Spin of the Nucleon ............................ 13
     2.1.4  Nucleons and Nuclei in 3-Dimensions ................ 15
     2.1.5  Physics at high Parton Densities ................... 17
     2.1.6  Summary and Conclusions ............................ 21
     2.1.7  References ......................................... 22
2.2  ERHIC ..................................................... 23
     2.2.1  Introduction ....................................... 23
     2.2.2  eRHIC Design Concept ............................... 28
     2.2.3  Beam Parameters and Luminosity ..................... 30
     2.2.4  Moderate Luminosity without Strong Hadron Cooling .. 34
     2.2.5  Beam-Beam Dynamics ................................. 37
     2.2.6  Layout of the Interaction Region ................... 38
     2.2.7  Spin Rotators ...................................... 44
     2.2.8  Electron Storage Ring .............................. 46
       2.2.8.1  Electron Storage Ring Overview ................. 46
       2.2.8.2  Maintaining Radiation Damping and Emittance
                Control for 5 GeV Electron Beams ............... 50
       2.2.8.3  Electron Spin Polarization in the Storage
                Ring ........................................... 57
       2.2.8.4  Polarization in the unperturbed ring ........... 54
       2.2.8.5  Polarization in presence of misalignments ...... 55
       2.2.8.6  Further considerations  м. ..................... 58
       2.2.8.7  Electron Storage Ring Dynamic Aperture ......... 58
       2.2.8.8  Collective Effects in the eRHIC Electron
                Storage Ring ................................... 61
     2.2.9  Hadron Ring ........................................ 64
       2.2.9.1  Lattice Design ................................. 64
       2.2.9.2  Keeping the Hadron Revolution Frequency
                Constant for all Beam Energies ................. 65
       2.2.9.3  Hadron Ring Dynamic Aperture ................... 65
       2.2.9.4  Electron Cloud Effects ......................... 66
       2.2.9.5  Intra-Beam Scattering .......................... 67
       2.2.9.6  Hadron Ring Strong Beam Cooling ................ 68
     2.2.10  Electron Injection Complex ........................ 70
       2.2.10.1  General Considerations ........................ 70
       2.2.10.2  Polarized Electron Source ..................... 71
       2.2.10.3  Rapid Cycling Synchroton ...................... 72
       2.2.10.4  Electron Injection ............................ 74
     2.2.11  Hardware Systems of the eRHIC EIC ................. 75
       2.2.11.1  Hadron RF Systems ............................. 75
       2.2.11.2  Hadron Injection Kicker ....................... 76
       2.2.11.3  Hadron Collimation ............................ 76
       2.2.11.4  Copper Coating of the RHIС Beam Pipe for
                 Hadrons ....................................... 76
       2.2.11.5  Electron Storage Ring Magnets ................. 76
       2.2.11.6  Vacuum System of the Electron Storage Ring .... 79
       2.2.11.7  RF System of Electron Storage Ring-Overview ... 82
       2.2.11.8  Superconducting RF Cavities ................... S3
       2.2.11.9  High Power RF Input Complex ................... 86
       2.2.11.10 Electron Storage Ring RF Power Supply ......... 87
       2.2.11.11 Crab Cavities ................................. 87
     2.2.12 Civil Construction and Infrastructure .............. 89
     2.2.13 Summary ............................................ 89
     2.2.14 References ......................................... 90
2.3  JLEIC - A Polarized Electron-Ion Collider at Jefferson
     Lab ....................................................... 92
     2.3.1  Introduction ....................................... 92
     2.3.2  JLEIC Design Overview .............................. 93
       2.3.2.1  JLEIC Baseline ................................. 93
       2.3.2.2  JLEIC Luminosity Concept ....................... 97
     2.3.3  Ion sources ........................................ 99
       2.3.3.1  Introduction ................................... 99
       2.3.3.2  Polarized Ion Source Technologiesons ........... 99
         2.3.3.2.1  Atomic Beam Polarized Ion Source (ABPIS) .. 100
         2.3.3.2.2  Operation ................................. 100
         2.3.3.2.3  Performance ............................... 101
         2.3.3.2.4  Prospects ................................. 102
       2.3.3.3  Optically-Pumped Polarized Ion Source
                (OPPIS) ....................................... 102
         2.3.3.3.1  Operation ................................. 103
         2.3.3.3.2  Performance ............................... 103
         2.3.3.3.3  Prospects ................................. 104
       2.3.3.4  Polarized 3He++ Source ........................ 104
       2.3.3.5  Summary ....................................... 104
       2.3.3.6  References .................................... 107
     2.3.4  Polarized Electron Source ......................... 105
       2.3.4.1 References ..................................... 104
     2.3.5  Electron Polarization with a Figure-8 Ring ........ 108
       2.3.5.1  Introduction .................................. 108
       2.3.5.2  Radiative Polarization Effects and Spin
                Matching ...................................... 108
       2.3.5.3  Universal Spin Rotator (USR) .................. 111
       2.3.5.4  Electron Polarization Design .................. 112
       2.3.5.5  Polarization Lifetime and Continuous
                Injection ..................................... 114
       2.3.5.6  Numerical A nalysis of Polarization Control
                Parameters .................................... 117
       2.3.5.7  References .................................... 119
     2.3.6  Ion Polarization in Figure-8 Ring ................. 121
       2.1.6.1  Requirements and challenges ................... 121
       2.3.6.2  The figure-8 scheme ........................... 122
       2.3.6.3  Acceleration ofpolarized proton and
                deuleron beams in the JLEIС ion collider
                ring .......................................... 122
       2.3.6.4  3D spin rotator and polarization control in
                the JLEIC ion collider ring ................... 126
       2.3.6.5  Spin flipping in the JLEIC ion collider ring .. 130
       2.3.6.6  References .................................... 131
     2.3.7  Electron Cooling and ERL Cooler ................... 132
       2.3.7.1  Multi-stage Cooling Scheme .................... 132
       2.3.7.2  Simulation for Proton Beam Cooling ............ 134
       2.3.7.3  Stacking and Pre-cooling in the Collider Ring . 134
       2.3.7.4  Cooling during collision ...................... 135
       2.3.7.5  Simulation for heavy ion beam cooling ......... 137
         2.3.7.5.1  DC Cooling for the heavy ion beam
                    injection in the booster ring ............. 137
         2.3.7.5.2  Stacking and pre-cooling in the collider
                    ring ...................................... 137
         2.3.7.5.3  Cooling during collision .................. 138
       2.3.7.6  Bunched Beam Cooler Design .................... 139
       2.3.7.7  References .................................... 143
     2.3.8  Interaction Region Design ......................... 144
       2.3.8.1  Introduction .................................. 144
       2.3.8.2  IR-Delector Integration ....................... 145
       2.3.8.3  Detector Regions .............................. 146
       2.3.8.4  Ion Interaction Region Optics ................. 148
       2.3.8.5  Forward Acceptance ............................ 149
       2.3.8.6  Electron beamline and far-forward electron
                detectors ..................................... 154
       2.3.8.7  Compensation of nonlinear beam dynamics
                effects of the interaction region ............. 156
       2.3.8.8  References .................................... 160
     2.3.9  Interaction Region Magnets ........................ 161
       2.3.9.1  Introduction .................................. 161
       2.3.9.2  Interaction Region Magnet Requirements and
                Designs ....................................... 161
       2.3.9.3  References .................................... 166
     2.3.10 Collective Effects ................................ 167
       2.3.10.1 Status of Impedance estimation ................ 167
       2.3.10.2 Single Bunch Instability ...................... 169
       2.3.10.3 Coupled Bunch Instabilities ................... 173
       2.3.10.4 Electron Cloud in the Ion Ring ................ 173
       2.3.10.5 Ion Effects in the Electron Ring .............. 173
       2.3.10.6 Conclusions ................................... 174
       2.3.10.7 References .................................... 175
     2.3.11 Beam-Beam Effects in JLEIC ........................ 176
       2.3.11.1 Introduction .................................. 176
       2.3.11.2 JLEIC parameter range and lattice design ...... 176
         2.3.11.2.1 Nominal lattice design .................... 176
         2.3.11.2.2 Kinematical ranges ........................ 176
         2.3.11.2.3 Beam-beam challenges ...................... 176
           2.3.11.2.3.1 Determination of the initial working
                        point 1 ............................... 176
           2.3.11.2.3.2 Strong longitudinal focusing and
                        synchrobetatron ....................... 176
           2.3.11.2.3.3 Search for an alternate working
                        point ................................. 178
         2.3.11.2.4 The effect of crabbing .................... 179
           2.3.11.2.4.1 Crabbing implementation ............... 179
           2.3.11.2.4.2 Initial studies and synchro-betatron
                        crabbing mode ......................... 179
           2.3.11.2.4.3 Luminosity after optimization ......... 180
         2.3.11.2.5 Beam synchronization and Gear Changing .... 181
         2.3.11.2.6 Initial results for gear changing ......... 181
       2.3.11.3 References .................................... 182

3    WORKSHOP AND CONFERENCE REPORTS .......................... 183
3.1  9th InternaAdvanced LinEar collider study GROup
     workshop 2018, ALEGRO2018 ................................ 183
3.2  future Circular Collider (FCC) Week 2018 ................. 185
3.3  International Particle Accelerator Conference, IPAC 18 ... 187
3.4  The 6th Electron-Cloud Workshop, ECL0UD'18 ............... 191
3.5  The 61st ICFA Advanced Beam Dynamics Workshop on High-
     Intensity and High-Brightness Hadron Beams, HB2018 ....... 194
3.6  Muon Collider Workshop 2018 .............................. 197

4    RECENT DOCTORIAL THESES .................................. 203
4.1  Circular Electron Positron Collider Booster Lattice
     Design and Nonlinear Beam Dynamics Optimization .......... 203
4.2  Coupling Impedance Measurement and Analysis of Critical
     Vacuum Chamber Components for the Advanced Photon
     Source (APS) Upgrade ..................................... 204

5    FORTHCOMING BEAM DYNAMICS EVENTS ......................... 205
5.1  Workshop on Accelerator Operations (WAO2018) ............. 205
5.2  DAFNE as Open Accelerator Test Facility in year 2020
     ICFA Mini- Workshop (DAFNE-TF) ........................... 207

6    ANNOUNCEMENTS OF THE BEAM DYNAMICS PANEL ................. 208
6.1  ICFA Beam Dynamics Newsletter ............................ 208
     6.1.1  Aim of the Newsletter ............................. 208
     6.1.2  Categories of Articles ............................ 208
     6.1.3  How to Prepare a Manuscript ....................... 208
     6.1.4  Distribution ...................................... 209
     6.1.5  Regular Correspondents ............................ 209
6.2  ICFA Beam Dynamics Panel Members ......................... 211


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