Title :
First operation of the superconducting electron cooler at the storage ring TARN II
Author :
Tanabe, T. ; Katayama, I. ; Ono, S. ; Chida, K. ; Watanabe, T. ; Arakaki, Y. ; Nod, K. ; Honma, T. ; Haruyama, Y. ; Saito, M. ; Odagiri, T. ; Hosono, K. ; Yosiyuki, T. ; Hosino, M. ; Watanabe, I.
Author_Institution :
Center for Nucl. Study, Tokyo Univ., Japan
Abstract :
A superconducting electron cooler with an adiabatic expansion factor of 100 was designed and constructed at the TARN II ring for high-precision experiments and high speed cooling. The gun solenoid is a liquid-helium-free superconducting magnet with a 20-cm room-temperature bore, which can produce a high magnetic field of up to 3.5 T. An electron beam is expanded from a diameter of 5 mm to 50 mm in a gradually decreasing solenoid field from 3.5 T to 0.035 T. With this cooler it can be expected to reach an electron temperature on the order of 1 meV. The cooler first came into operation in November, 1996. The spectrum of the dissociative recombination, 3HeH++e→3He+H, clearly showed a dramatic decrease in the electron-beam temperature compared with our previous data measured at an expansion factor of 10 with a normal-conducting solenoid
Keywords :
beam handling equipment; electron accelerators; magnetic fields; storage rings; 0.035 to 3.5 T; 1 meV; TARN II; adiabatic expansion factor; dissociative recombination; electron-beam temperature; magnetic field; solenoid field; storage ring; superconducting electron cooler; Atomic measurements; Cooling; Electron beams; Energy resolution; Magnetic fields; Solenoids; Storage rings; Superconducting coils; Superconducting magnets; Temperature;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750757
