| Paper |
Title |
Other Keywords |
Page |
| TUPSA015 |
Injector Complex of the NICA Facility
|
ion, linac, electron, proton |
71 |
| |
- A. O. Sidorin, A. V. Butenko, E. D. Donets, E. E. Donets, V. V. Fimushkin, A. Govorov, V. Kobets, I. N. Meshkov, V. Monchinsky, G. V. Trubnikov
JINR, Dubna, Moscow Region
- A. Belov
RAS/INR, Moscow
- O. K. Belyaev, Yu. A. Budanov, A. P. Maltsev, I. A. Zvonarev
IHEP Protvino, Protvino, Moscow Region
- V. V. Kapin
MEPhI, Moscow
| |
The injection complex of the NICA facility consists of existing Alvarez-type linac LU-20, new heavy ion linac HILac, polarized and heavy ion sources. The LU-20 is under modernization now, the HILac will be constructed during coming years. Parameters of the accelerators are presented.
|
|
|
|
| WEPSB009 |
Acceleration of Heavy Ions in Space Periodic Quadrupole RF Focusing Structure
|
acceleration, focusing, ion, quadrupole |
190 |
| |
- Yu. A. Budanov, O. K. Belyaev, A. Maltsev, I. A. Zvonarev
IHEP Protvino, Protvino, Moscow Region
| |
On the basis of the structures with a longitudinal magnetic field resonators it is possible to apply a system of space periodic RF quadrupole focusing (RFQ DTL) for acceleration of heavy ions. Essential RFQ DTL feature is dependence of focusing properties of the channel on a phase of a high-frequency field. Thus, the bunches of particles after preliminary acceleration in RFQ should have small phase size. However at acceleration of heavy ions the phase size of bunch changes slowly and it remains rather big after RFQ. The developed matching device, consisting of buncher and quadrupole lenses, allows to solve the given problem and, in general, to improve the matching on all six phase variables. Numerical calculations are carried out by the example of ions of gold in RFQ DTL at working frequency of 74 MHz, input energy 0.4 MeV/n and output energy 2 MeV/n.
|
|
|
|
| WEPSB015 |
Simulation of Carbon Ion Extraction and Low Energy Beam Transport System for RFQ at the Linac I-100
|
ion, extraction, plasma, emittance |
201 |
| |
- B. A. Frolov
IHEP Protvino, Protvino, Moscow Region
| |
For the carbon ion injection into the radio frequency quadrupole, a laser ion source and a low energy beam transport system (LEBT) has to deliver 20 mA C+5 ion beam with 80 keV at the entrance of RFQ within normalized emittance of 0.4Pi mm mrad. An extraction system and a low energy transport line should be optimized to reduce the beam emittance as far as possible. The results of computer simulation are presented for extraction and LEBT systems: combinations of a tetrode extraction system and an electrostatic focusing lens consisting of three electrodes with negative voltage of a middle grid electrode.
|
|
|
|
| THPSC003 |
Development of Wire-Meshed Electrostatic Lenses for Proton Linac
|
focusing, proton, linac, ion |
325 |
| |
- V. V. Kapin, B. Y. Bogdanovich, A. Nesterovich, V. V. Yanenko
MEPhI, Moscow
| |
The 2-MeV 150-MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI). Its output beam-line contains doublet of the electrostatic focusing lenses with a novel design featured by the two-dimensional electric field and wire-meshed beam apertures. Every lens provides a transverse focusing effect only in one plane, while does not affect on the beam in a perpendicular plane. In this report, the analytical and numerical analysis of this lens is presented. The optics of output beam-line including these lenses is evaluated with TRACE-3D code. The experimental construction of the lens doublet is presented.
|
|
|
|
| THPSC014 |
One Aspect of Thermal Stability for 4-vane RFQ Operation with High Heat Loading
|
linac, coupling, controls, simulation |
352 |
| |
- V. V. Paramonov
RAS/INR, Moscow
| |
Due to dispersion properties, 4-vane RFQ cavity without resonant coupling is a thermally unstable structure. With deterioration of balance for local detuning, especially near cavity ends, there is a possibility for runaway in the field distribution and related thermal-stress effects. It can, in principle, finish with irreversible plastic deformations and cavity frequency shift. Both the increment and the threshold of instability are proportional to the average dissipated RF power. This possibility increases for long RFQ cavities. Also particularities for the cavity ends design are important. Some general features of this effect are discussed and illustrated with simulations.
|
|
|
|