Author: Arthur Malcolm VetterPublisher:
ISBN:
Category : Electron beams
Languages : en
Pages : 306
Book Description
Regenerative Beam Breakup in Multi-pass Electron Accelerators
Author: Arthur Malcolm VetterPublisher:
ISBN:
Category : Electron beams
Languages : en
Pages : 306
Book Description
Multipass Beam Breakup in Recirculating Linacs
Author: Joseph J. BisognanoRegenerative Multi-pass Beam Breakup in Two Dimensions
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In this paper, a formula, describing a threshold of the regenerative multi-pass Beam Breakup (BBU) for a single dipole higher order mode with arbitrary polarization in a two-pass accelerator with a general-form, 4x4 recirculation matrix, is derived. Also a new two-dimensional BBU code is introduced. To illustrate specifics of the BBU in two dimensions, the formula is used to calculate the threshold in several cases including two-dimensional uncoupled optics, reflecting optics, and rotating optics. The analytical results are compared to results of simulation obtained with the new code. At the end of the paper, a mathematical relation between transfer matrices between cavities of the accelerating structure and recirculation matrices for each cavity, which must be satisfied in order to successfully suppress the BBU by reflection or rotation in several cavities, is presented.
Multipass Beam Breakup in the Continuous Electron Beam Accelerator Faility Superconducting Linac
Author: Joseph J. BisognanoMultipass Beam Breakup Study at Jefferson Lab for the 12 GeV CEBAF Upgrade
Author: Ilkyoung ShinSuppression of Multipass, Multibunch Beam Breakup in Two Pass Recirculating Accelerators
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Beam Breakup (BBU) occurs in all accelerators at sufficiently high currents. In recirculating accelerators, such as the energy recovery linacs used for high power FELs, the maximum current has historically been limited by multipass, multibunch BBU, a form that occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on one pass and then again on the second pass. This effect is of particular concern in the designs of modern high average current energy recovery accelerators utilizing superconducting technology. In such two pass machines rotation of the betatron planes by 90a, first proposed by Smith and Rand in 1980 [1], should significantly increase the threshold current of the multibunch BBU. Using a newly developed two-dimensional tracking code, we study the effect of optical suppression techniques on the threshold current of the JLAB FEL Upgrade. We examine several optical rotator schemes and evaluate their performance in terms of the instability threshold current increase.
Two Dimensional Simulations of Multipass Beam Breakup
Author: G. A. KrafftRecirculating Electron Accelerators
Author: Roy Edward RandPublisher: Routledge
ISBN:
Category : Recirculating electron accelerators
Languages : en
Pages : 264
Book Description
Two Dimensional Simulations of Multipass Beam Breakup
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 2060
Book Description
A vectorized two dimensional beam breakup code, TDBBU, is used to simulate bunch dynamics in recirculating accelerators. First, the code is briefly described, including effects needed to accurately model the CEBAF accelerator. Next, various code test are sketched. Finally, the multipass beam breakup threshold current is determined to be from 10-20 mA for the CEBAF accelerator, a result in agreement with other calculations of the threshold current.
Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In recirculating accelerators, and in particular energy recovery linacs (ERLs), the maximum current can be limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovering pass. This effect is of particular concern in the design of modern high average current energy recovery accelerators utilizing superconducting RF technology. Experimental characterization and observations of the instability at the Jefferson Laboratory 10 kW Free Electron Laser (FEL) are presented. Measurements of the threshold current for the instability are made under a variety of beam conditions and compared to the predictions of several BBU simulation codes. This represents the first time in which the codes have been experimentally benchmarked. With BBU posing a threat to high current beam operation in the FEL Driver, several suppression schemes were developed.