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Title: SEPTUM MAGNET DESIGN FOR THE APS-U

Abstract

The Advanced Photon Source is in the process of upgrading its storage ring from a double-bend to a multi-bend lattice as part of the APS Upgrade Project (APS-U). A swap-out injection scheme is planned for the APS-U to keep a constant beam current and to enable a small dynamic aperture. A septum magnet with a minimum thickness of 2 mm and an injection field of 1.06 T has been designed, delivering the required total deflecting angle is 89 mrad with a ring energy of 6 GeV. The stored beam chamber has an 8 mm x 6 mm super-ellipsoidal aperture. The magnet is straight; however, it is tilted in yaw, roll, and pitch from the stored beam chamber to meet the on axis swap out injection requirements for the APS-U lattice. In order to minimize the leakage field inside the stored beam chamber, four different techniques were utilized in the design. As a result, the horizontal deflecting angle of the stored beam was held to only 5 µrad, and the integrated skew quadrupole inside the stored beam chamber was held to 0.09 T. The detailed techniques that were applied to the design, field multipoles, and resulting trajectories of the injected andmore » stored beams are reported.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1394615
DOE Contract Number:
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2016 North American Particle Accelerator Conference, 10/09/16 - 10/14/16, Chicago, IL, US
Country of Publication:
United States
Language:
English

Citation Formats

Abliz, M., Jaski, M., Xiao, A., Wienands, U., Cease, H., Borland, M., Decker, G., and Kerby, J. SEPTUM MAGNET DESIGN FOR THE APS-U. United States: N. p., 2017. Web.
Abliz, M., Jaski, M., Xiao, A., Wienands, U., Cease, H., Borland, M., Decker, G., & Kerby, J. SEPTUM MAGNET DESIGN FOR THE APS-U. United States.
Abliz, M., Jaski, M., Xiao, A., Wienands, U., Cease, H., Borland, M., Decker, G., and Kerby, J. Sun . "SEPTUM MAGNET DESIGN FOR THE APS-U". United States. doi:. https://www.osti.gov/servlets/purl/1394615.
@article{osti_1394615,
title = {SEPTUM MAGNET DESIGN FOR THE APS-U},
author = {Abliz, M. and Jaski, M. and Xiao, A. and Wienands, U. and Cease, H. and Borland, M. and Decker, G. and Kerby, J.},
abstractNote = {The Advanced Photon Source is in the process of upgrading its storage ring from a double-bend to a multi-bend lattice as part of the APS Upgrade Project (APS-U). A swap-out injection scheme is planned for the APS-U to keep a constant beam current and to enable a small dynamic aperture. A septum magnet with a minimum thickness of 2 mm and an injection field of 1.06 T has been designed, delivering the required total deflecting angle is 89 mrad with a ring energy of 6 GeV. The stored beam chamber has an 8 mm x 6 mm super-ellipsoidal aperture. The magnet is straight; however, it is tilted in yaw, roll, and pitch from the stored beam chamber to meet the on axis swap out injection requirements for the APS-U lattice. In order to minimize the leakage field inside the stored beam chamber, four different techniques were utilized in the design. As a result, the horizontal deflecting angle of the stored beam was held to only 5 µrad, and the integrated skew quadrupole inside the stored beam chamber was held to 0.09 T. The detailed techniques that were applied to the design, field multipoles, and resulting trajectories of the injected and stored beams are reported.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 25 00:00:00 EDT 2017},
month = {Sun Jun 25 00:00:00 EDT 2017}
}

Conference:
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  • The Advanced Photon Source is in the process of developing an upgrade (APS-U) of the storage ring. The upgrade will be converting the current double bend achromat (DBA) lattice to a multi-bend achromat (MBA) lattice. In addition, the storage ring will be operated at 6 GeV and 200 mA with regular swap-out injection to keep the stored beam current constant [1]. The swap-out injection will take place with beamline shutters open. For radiation safety to ensure that no electrons can exit the storage ring, a passive method of protecting the beamline and containing the electrons inside the storage ring ismore » proposed. A clearing magnet will be located in all beamline front ends inside the storage ring tunnel. This article will discuss the features and design of the clearing magnet scheme for APS-U.« less
  • No abstract prepared.
  • The higher requirements for beam injection stability at the APS storage ring (SR) demand improvement of pulsed power supplies for the septum magnets. The new specification for the current repeatability is 1/2000. The upgrade will be performed in two stages. In the first stage we will implement a new voltage regulation circuit in the power supply with a new timing sequence that will provide better voltage regulation performance. A common design is made for all of the septum magnet power supplies (SMPSs) at the APS. The new regulation module has already been tested on both thin and thick SMPSs. Themore » test shows that the achieved voltage regulation is much better than 1/2000. Combined with a current feedback loop, it can provide a shot-to-shot current repeatability better than 1/2000. The second phase of the upgrade will develop the current feedback loop and control algorithm. This paper will describe the design and test results for the first phase only.« less
  • A pulsed septum magnet has been designed and constructed for beam injection and extraction in the Advanced Photon Source at Argonne National Laboratory. The magnets will be similar for the Positron Accumulator Ring (PAR), the Injector Synchrotron, and the Storage Ring. The septum itself is 2 mm thick and consists of 1-mm-thick copper and S1010 steel explosion-bonded together. The PAR magnet is driven by a 1500-Hz, 12-kA half sine wave current pulse. The core is made of 0.36-mm-thick laminations of silicon steel. The nearly uniform interior field is 0.75 T and the exterior field is 0.0004 T at the undisturbedmore » beam position and 0.0014 T at the bumped beam position. Testing of the magnet awaits the completion of the power supply.« less
  • The mechanical design, construction, and assembly procedure of six different septum magnet designs used in the Advanced Photon Source (APS) facility will be described. This will include a positron accumulator ring (PAR) AC septum magnet, a synchrotrons thin injection septum AC thin and thick extraction septa, and storage ring AC thick and thin injection septum magnets. Design parameters, material selection, assembly procedures, and operational results will be presented.