| Paper |
Title |
Page |
| MOPKF077 |
Reducing the Synchrotron Radiation on RF Cavity Surfaces in an Energy-recovery Linac
|
494 |
| |
- G. Hoffstaetter, M. Liepe, T. Tanabe
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
|
|
| |
In Energy Recovery Linac (ERL) light sources, a high energy, high current beam has to be bend into a superconducting linac to be decelerated. The synchrotron radiation produced in the last bending magnet before the linac shines into the superconducting structures if not collimated appropriately. Due to the length of the linac, the radiation cannot be completely guided through the superconducting structure, as in existing SRF storage rings. For the example of an ERL extension to the existing CESR storage ring at Cornell we estimate the magnitude of this problem by quantifying the heat load that can be accepted on a superconducting surface and by analyzing how much radiation is deposited on the cavity surfaces for different collimation schemes.
|
|
| WEODCH02 |
Interaction of Stored Ions with Electron Target in Low Energy Electrostatic Ring
|
162 |
| |
- E. Syresin
JINR, Dubna, Moscow Region
- K. Noda
NIRS, Chiba-shi
- T. Tanabe
KEK, Ibaraki
|
|
| |
The KEK electrostatic ring is used for investigations of molecular, bimolecular and DNA ions. The electron target installed in this ring has same construction as usual electron cooler. The interaction of stored ions with the electrons increases the ion lifetime at electron cooling caused by a suppression of the ion scattering on the residual gas atoms. The proton lifetime of 2 s was increased in the experiments by factor 2 at the electron cooling with the electron beam current of 0.2 mA, the proton energy of 20 keV and the residual gas pressure of 0.04 nTorr. However the electron-ion interaction can decrease the ion lifetime caused by an excitation of the transverse instability produced by an intensive electron beam. So in the KEK electrostatic ring the proton lifetime is reduced to 1.7 s at detuning of electron acceleration voltage from nominal cooler value on 0.4 V. The simulation of electron cooling and transverse instability of the light and DNA ions are discussed in this report.
|
|
|
Video of talk
|
|
Transparencies
|