Fast Transverse Beam Instability Caused By Electron Cloud Trapped In Combined Function Magnets - Antipov Sergey A. | Libro Springer 11/2018 - HOEPLI.it


home libri books ebook dvd e film top ten sconti 0 Carrello


Torna Indietro

antipov sergey a. - fast transverse beam instability caused by electron cloud trapped in combined function magnets

Fast Transverse Beam Instability Caused by Electron Cloud Trapped in Combined Function Magnets




Disponibilità: Normalmente disponibile in 15 giorni


PREZZO
114,98 €
NICEPRICE
97,73 €
SCONTO
15%



Questo prodotto usufruisce delle SPEDIZIONI GRATIS
selezionando l'opzione Corriere Veloce in fase di ordine.


Pagabile anche con App18 Bonus Cultura e Carta Docenti


Facebook Twitter Aggiungi commento


Spese Gratis

Dettagli

Genere:Libro
Lingua: Inglese
Editore:

Springer

Pubblicazione: 11/2018
Edizione: 1st ed. 2018





Sommario

LIST OF FIGURES ......................................................................................................................................... iii
LIST OF TABLES ........................................................................................................................................... vi
ACKNOWLEDGEMENTS ......................................................................................................................... vii
ABSTRACT ....................................................................................................................................................... ix
1 ELECTRON CLOUD IN PARTICLE ACCELERATORS ................................................................. 1
1.1 Electron cloud build-up .......................................................................................................................... 3
1.2 Electron cloud instabilities ................................................................................................................... 12
1.3 Electron cloud tune shift ...................................................................................................................... 15
1.4 Beampipe conditioning ......................................................................................................................... 17
2 BEAM DYNAMICS MEASUREMENTS OF THE FAST INSTABILITY ................................... 20
2.1 Beam manipulation and diagnostics ................................................................................................... 20
2.2 Dynamics of the unstable beam .......................................................................................................... 26
2.3 Beam stabilization by a clearing bunch .............................................................................................. 35
3 MICROWAVE MEASUREMENT OF THE CLOUD DENSITY .................................................. 43
3.1 Experimental setup ............................................................................................................................... 44
3.2 Schottky noise ........................................................................................................................................ 50
3.3 Measured electron cloud density ......................................................................................................... 56
4 NUMERICAL SIMULATION ................................................................................................................. 59
4.1 Electron cloud trapping in a combined function magnet ............................................................... 60
4.2 Numerical model ................................................................................................................................... 65
4.3 Electron cloud build-up ........................................................................................................................ 68
4.4 Electron cloud instability ...................................................................................................................... 81
5 ANALYTICAL MODEL OF THE ELECTRON CLOUD INSTABILITY .................................. 87
5.1 Model of the beam-cloud interaction ................................................................................................. 87
5.2 Fast instability in Recycler .................................................................................................................... 92
5.3 Instability at higher intensities ............................................................................................................. 96
5.4 Landau damping of the fast instability using octupoles ................................................................... 97
6 CONCLUSION ......................................................................................................................................... 102
REFERENCES.............................................................................................................................................. 105




Trama

This thesis presents profound insights into the origins and dynamics of beam instabilities using both experimental observations and numerical simulations. When the Recycler Ring, a high-intensity proton beam accelerator at Fermi National Accelerator Laboratory, was commissioned, it became evident that the Recycler beam experiences a very fast instability of unknown nature. This instability was so fast that the existing dampers were ineffective at suppressing it. The nature of this phenomenon, alongside several other poorly understood features of the beam, became one of the biggest puzzles in the accelerator community.

The author investigated a hypothesis that the instability arises from an interaction with a dense cloud of electrons accompanying the proton beam. He studied the phenomena experimentally by comparing the dynamics of stable and unstable beams, by numerically simulating the build-up of the electron cloud and its interaction with the beam, and by constructing an analytical model of an electron cloud-driven instability with the electrons trapped in combined-function dipole magnets. He has devised a method to stabilize the beam by a clearing bunch, which conclusively revealed that the instability is caused by the electron cloud, trapped in a strong magnetic field. Finally, he conducted measurements of the microwave propagation through a single dipole magnet. These measurements have confirmed the presence of the electron cloud in combined-function magnets.





Autore

Sergey Antipov received his PhD from the University of Chicago in 2017 where his doctoral research earned him the 2018 Outstanding Doctoral Thesis Research in Beam Physics Award from the American Physical Society Division of the Physics of Beams. He is currently a Postdoctoral Fellow at CERN.







Altre Informazioni

ISBN:

9783030024079

Condizione: Nuovo
Collana: Springer Theses
Dimensioni: 235 x 155 mm Ø 325 gr
Formato: Copertina rigida
Illustration Notes:14 Illustrations, black and white
Pagine Arabe: 88
Pagine Romane: xi






Utilizziamo i cookie di profilazione, anche di terze parti, per migliorare la navigazione, per fornire servizi e proporti pubblicità in linea con le tue preferenze. Se vuoi saperne di più o negare il consenso a tutti o ad alcuni cookie clicca qui. Chiudendo questo banner o proseguendo nella navigazione acconsenti all’uso dei cookie.

X