Title :
Status of the PEP-II low-energy ring vacuum system
Author :
Cheng, D. ; Hunt, D. ; Hsieh, H. ; Meneghetti, J. ; Kennedy, K. ; Stevens, T. ; Jones, G. ; Miller, T. ; Colomb, D. ; Bertolini, L. ; Belser, C. ; Kerns, J. ; Daly, E.
Author_Institution :
Lawrence Berkeley Lab., CA, USA
Abstract :
The PEP-II B Factory Low-Energy Ring (LER) will operate at 3.1 GeV with 2.1 A; design specifications are based on 3.5 GeV at 3 A. The vacuum system, 2200 m long, consists of 6 arcs and 6 straights. The arc vacuum system is based on an aluminum antechamber pumped by titanium sublimators located directly under discrete photon stops, supplemented by 110 1/s ion pumps near the end of each dipole. The straight sections serve various utility functions, including emittance control with a wiggler, injection, and an interaction region (IR). Vacuum chambers in most of the straight sections are circular stainless steel pipe with external copper plating to facilitate heat transfer to cooling tubes brazed to the outside wall. The wiggler chicane vacuum system uses both aluminum and stainless steel technology, along with a 24 m long distributed copper photon dump. The IR vacuum system is mainly based on copper extrusions. LER vacuum system components are either in the late stage of prototyping or already in full production
Keywords :
colliding beam accelerators; electron accelerators; storage rings; vacuum apparatus; 2.1 A; 3 A; 3.1 GeV; 3.5 GeV; PEP-II B Factory Low-Energy Ring; PEP-II low-energy ring vacuum system; aluminum antechamber; arc vacuum system; discrete photon stops; emittance control; external copper plating; heat transfer; injection; interaction region; titanium sublimators; wiggler; wiggler chicane vacuum system; Aluminum; Cooling; Copper; Heat transfer; Production facilities; Steel; Titanium; Undulators; Vacuum arcs; Vacuum systems;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753293
