Title :
The DAΦNE Main Ring Vacuum System
Author :
Chimenti, V. ; Clozza, A. ; Hsieh, H. ; Raffone, G. ; Vaccarezza, C.
Author_Institution :
Istituto Nazionale di Fisica Nucl., Rome, Italy
Abstract :
The DAΦNE Main Ring Vacuum System is designed for an mean operating pressure of 1 nTorr with a circulating current of about 5 A/beam. Finite elements calculations have been carried out to check the maximum possible deformation for the bending quadrant vacuum chamber that will be made of Al 5083-11321. Water cooled copper absorbers are employed to cope with the Synchrotron Radiation, (SR), produced in the wigglers and dipoles. The total gas load due to SR is Q≈2.6×10 -5 Torr 1/s per arc for CO, with a photodesorption rate η≈1×10-6 molec/ph, (after ≈40 Ahr of commissioning), as measured at NSLS-BNL. Nine sputter ion pumps and nine titanium sublimation pumps are located in each arc to provide, respectively, the 15% and the 85% of the required pumping speed
Keywords :
finite element analysis; ion pumps; storage rings; vacuum apparatus; 1*10-9 torr; Al; Cu; DAΦNE; DAONE; Main Ring Vacuum System; bending quadrant vacuum chamber; dipoles; photodesorption; sputter ion pumps; sublimation pumps; synchrotron radiation; wigglers; Copper; Finite element methods; Pumps; Stress; Strontium; Structural beams; Synchrotron radiation; Titanium; Undulators; Vacuum systems;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309841
