PAC2013 - List of Authors (Sun, X.)

Paper	Title	Page
WEPSM06	Beam-Induced Heat Load Predictions and Measurements in the APS Superconducting Undulator	1055
	K.C. Harkay, L.E. Boon, M. Borland, Y.-C. Chae, R.J. Dejus, J.C. Dooling, C.L. Doose, L. Emery, Y. Ivanyushenkov, M.S. Jaski, M. Kasa, S.H. Kim, R. Kustom, V. Sajaev, Y. Shiroyanagi, X. Sun ANL, Argonne, USA L.E. Boon Purdue University, West Lafayette, Indiana, USA
	Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The first prototype superconducting undulator (SCU0) was successfully installed and commissioned at the Advanced Photon Source (APS) and is delivering photons for user science. The cryosystem was designed to handle a beam-induced heat load of up to 40 W. Prior to operations, detailed predictions of this heat load were made, including that produced by resistive wall heating by the image current, geometric wakefields, synchrotron radiation, electron cloud, and beam losses. The dominant cw source is the resistive wall heat load. The heat load predictions for standard 100 mA user operation were benchmarked using thermal sensors that measure temperatures at various locations in the SCU0 cryostat and along the electron beam chamber. Thermal analysis using the predicted heat loads from the electron beam, using three independent methods, agrees well with the observed measurements.

THPAC08	Modernization of the Bergoz Multiplexed BPM System for the APS Upgrade	1154
	X. Sun, H. Bui, G. Decker, R.T. Keane, R.M. Lill, B.X. Yang ANL, Argonne, USA
	Funding: * Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 The APS upgrade includes improvements to the Bergoz Multiplexed BPM system, which presently suffers from an aging data acquisition system. The upgrade leverages off the development of an eight-channel data acquisition system featuring modern FPGA flexibility that was designed for the monopulse BPM system. This upgrade also provides an external clock signal synchronized to the APS revolution clock that will eliminate the aliasing caused by the Bergoz asynchronous multiplexing interacting with different accelerator fill patterns. The upgrade will revitalize this system and demonstrate a cost-effective approach to improved beam stability, reliability, and enhanced postmortem capabilities. In this paper we will discuss the upgrade system specifications, design, and prototype test results.

Paper

Title

Page

Beam-Induced Heat Load Predictions and Measurements in the APS Superconducting Undulator

1055

K.C. Harkay, L.E. Boon, M. Borland, Y.-C. Chae, R.J. Dejus, J.C. Dooling, C.L. Doose, L. Emery, Y. Ivanyushenkov, M.S. Jaski, M. Kasa, S.H. Kim, R. Kustom, V. Sajaev, Y. Shiroyanagi, X. Sun
ANL, Argonne, USA
L.E. Boon
Purdue University, West Lafayette, Indiana, USA

Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The first prototype superconducting undulator (SCU0) was successfully installed and commissioned at the Advanced Photon Source (APS) and is delivering photons for user science. The cryosystem was designed to handle a beam-induced heat load of up to 40 W. Prior to operations, detailed predictions of this heat load were made, including that produced by resistive wall heating by the image current, geometric wakefields, synchrotron radiation, electron cloud, and beam losses. The dominant cw source is the resistive wall heat load. The heat load predictions for standard 100 mA user operation were benchmarked using thermal sensors that measure temperatures at various locations in the SCU0 cryostat and along the electron beam chamber. Thermal analysis using the predicted heat loads from the electron beam, using three independent methods, agrees well with the observed measurements.

THPAC08

Modernization of the Bergoz Multiplexed BPM System for the APS Upgrade

1154

X. Sun, H. Bui, G. Decker, R.T. Keane, R.M. Lill, B.X. Yang
ANL, Argonne, USA

Funding: * Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357
The APS upgrade includes improvements to the Bergoz Multiplexed BPM system, which presently suffers from an aging data acquisition system. The upgrade leverages off the development of an eight-channel data acquisition system featuring modern FPGA flexibility that was designed for the monopulse BPM system. This upgrade also provides an external clock signal synchronized to the APS revolution clock that will eliminate the aliasing caused by the Bergoz asynchronous multiplexing interacting with different accelerator fill patterns. The upgrade will revitalize this system and demonstrate a cost-effective approach to improved beam stability, reliability, and enhanced postmortem capabilities. In this paper we will discuss the upgrade system specifications, design, and prototype test results.