skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Progress on the Design of the Storage Ring Vacuum System for the Advanced Photon Source Upgrade Project

Abstract

Recent work on the design of the storage ring vacuum system for the Advanced Photon Source Upgrade project (APS-U) includes: revising the vacuum system design to accommodate a new lattice with reverse bend magnets, modifying the designs of vacuum chambers in the FODO sections for more intense incident synchrotron radiation power, modifying the design of rf-shielding bellows liners for better performance and reliability, modifying photon absorber designs to make better use of available space, and integrated planning of components needed in the injection, extraction and rf cavity straight sections. An overview of progress in these areas is presented.

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:
1389069
DOE Contract Number:
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 8th International Particle Accelerator Conference (IPAC 2017), 05/14/17 - 05/19/17, Copenhagen, DK
Country of Publication:
United States
Language:
English

Citation Formats

Stillwell, B., Billett, B., Brajuskovic, B., Carter, J., Kirkus, E., Lale, M., Lerch, J., Noonan, J., O'Neill, M., Rocke, B., Suthar, K., Walters, D., Wiemerslage, G., and Zientek, J. Progress on the Design of the Storage Ring Vacuum System for the Advanced Photon Source Upgrade Project. United States: N. p., 2017. Web.
Stillwell, B., Billett, B., Brajuskovic, B., Carter, J., Kirkus, E., Lale, M., Lerch, J., Noonan, J., O'Neill, M., Rocke, B., Suthar, K., Walters, D., Wiemerslage, G., & Zientek, J. Progress on the Design of the Storage Ring Vacuum System for the Advanced Photon Source Upgrade Project. United States.
Stillwell, B., Billett, B., Brajuskovic, B., Carter, J., Kirkus, E., Lale, M., Lerch, J., Noonan, J., O'Neill, M., Rocke, B., Suthar, K., Walters, D., Wiemerslage, G., and Zientek, J. Tue . "Progress on the Design of the Storage Ring Vacuum System for the Advanced Photon Source Upgrade Project". United States. doi:. https://www.osti.gov/servlets/purl/1389069.
@article{osti_1389069,
title = {Progress on the Design of the Storage Ring Vacuum System for the Advanced Photon Source Upgrade Project},
author = {Stillwell, B. and Billett, B. and Brajuskovic, B. and Carter, J. and Kirkus, E. and Lale, M. and Lerch, J. and Noonan, J. and O'Neill, M. and Rocke, B. and Suthar, K. and Walters, D. and Wiemerslage, G. and Zientek, J.},
abstractNote = {Recent work on the design of the storage ring vacuum system for the Advanced Photon Source Upgrade project (APS-U) includes: revising the vacuum system design to accommodate a new lattice with reverse bend magnets, modifying the designs of vacuum chambers in the FODO sections for more intense incident synchrotron radiation power, modifying the design of rf-shielding bellows liners for better performance and reliability, modifying photon absorber designs to make better use of available space, and integrated planning of components needed in the injection, extraction and rf cavity straight sections. An overview of progress in these areas is presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • The Advanced Photon Source (APS) Storage Ring Vacuum Chambers (SRVC) are constructed of aluminum. The chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an aluminum alloy 6063-T5 extruded chamber body. Vacuum connections to the aluminum Conflat chamber flanges are by means of 304 stainless steel Conflat flanges. To evaluate the Conflat seal assemblies relative to vacuum bake cycles, a Conflat Bake Test Assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature and 150{degrees}C on both stainless steel to aluminum Conflat assemblies and aluminum to aluminum Conflat assemblies. A Helicoflex Bake Test Assembly (HBTA) wasmore » similarly constructed to evaluate Helicoflex seals. Both Conflat and Helicoflex seals were studied in a SRVC Sector String Test arrangement of five SRVC sections. The CBTA, HBTA and SRVC tests and their results are reported. 3 refs., 2 figs., 2 tabs.« less
  • The status of the design and fabrication of a prototype sector of the storage ring vacuum system for the Advanced Photon Source is described. The 26.5-m-long prototype sector will be assembled within a full-scale magnet and tunnel mockup to study interspacial component relationships for maintenance, as well as the vacuum system operational performance. Each completed vacuum section is mounted as an integral part of the modular structure that contains the magnets and magnet power supplies on a common base. Unique automatic machine welding designs and techniques are employed in the fabrication of the aluminium vacuum chambers from extrusions. Special chambermore » bending procedures and measurements checks are used to maintain the required flatness of the insider chamber light gap surfaces. Photo-electron yields due to low-energy photons in the narrow channel gap of the vacuum chamber and their potential effects on the overall outgassing rate are found to be negligible. 9 refs., 5 figs.« less
  • Recent machine studies at the Advanced Photon Source (APS) showed that at a beam current of about 140 mA, the storage ring (SR) injection-area components experienced unacceptable elevated temperatures. Heating of these components is related to several factors, namely: aperture discontinuity, poor contact between the rf fingers and the solid sleeve liner, inadequate x-ray shielding, and nonuniform conductive coating on the kicker ceramic chambers. To address these deficiencies, we have developed design upgrades for the injection-area kicker magnets, vacuum chambers, transition absorbers, and bellows-liner assemblies. In this paper, we discuss important features of the new designs and their impact onmore » machine operation at high beam current.« less
  • From the start of operations of the Advanced Photon Source storage ring, we have observed small thermally related dipole sources appearing soon after filling. Because there are many like sources occurring at about the same time, it has been difficult to locate them. Some sources have recently been located with a specially configured orbit correction running while the vacuum chamber temperature is changed. Vacuum chamber motion, seen as an apparent orbit change, can also be estimated from the results.