| Paper |
Title |
Page |
| WEPKF003 |
Design of the End Magnets for the IFUSP Main Microtron
|
1591 |
| |
- M.L. Lopes, A.A. Malafronte, M.N. Martins, J. Takahashi
USP/LAL, Bairro Butantan
- K.-H. Kaiser
IKP, Mainz
|
|
| |
The Instituto de Física da Universidade de São Paulo (IFUSP) is building a two-stage 31 MeV continuous wave (cw) racetrack microtron. In this work we describe the characteristics of the end magnets for the IFUSP main microtron. The magnets are part of the main acceleration stage, which raises the energy from 4.9 to 31 MeV. We are studying the possibility of increasing the energy up to 38 MeV, so the magnets should have approximately 2x1 m2 region of useful field. The dipoles have a 0.1410 T magnetic field and 1 part in 1000 homogeneity without correcting devices. Using a 2D magnetic field code (FEMM), we illustrate the use of homogenizing gaps with different forms and non parallel pole faces to achieve the necessary homogeneity. The use of clamps to produce reverse fields to reduce the vertical defocusing strength on the beam is also described. In order to calculate the beam trajectories and to evaluate the magnetic field homogeneity within the useful region, a 3D magnetic field software (TOSCA) was used.
|
|
| WEPKF004 |
Magnetic Quadrupole Lenses for the IFUSP Microtron
|
1594 |
| |
- T.F. Silva, M.L. Lopes, A.A. Malafronte, M.N. Martins, P.B. Rios, J. Takahashi
USP/LAL, Bairro Butantan
|
|
| |
The Instituto de Física da Universidade de São Paulo (IFUSP) is building a two-stage 31 MeV continuous wave (cw) racetrack microtron. In this work, we describe the design of the magnetic quadrupole lenses for the IFUSP microtron. The design consists of a laminar structure divided in four equal pieces. Because each piece corresponds to an individual pole, it eases the assembling of the coils and the installation of the quadrupole on the beam transport line without breaking the vacuum. Due to the fact that the quadrupole is laminated along the longitudinal axis, it is possible to change the length of a given lens by adding or subtracting foils. We also present the magnetic field distribution calculated using the POISSON code. A prototype presented good mechanical rigidity and thermal performance, showing that a refrigeration system is not necessary. The magnetic measurements show that the field distribution within the region of interest agrees with the POISSON simulation.
|
|
| WEPKF005 |
Pressure Field Distribution in a Cylindrical Geometry with Arbitrary Cross Section
|
1597 |
| |
- F.T. Degasperi
FATEC-SP, Sao Paulo, SP
- M.N. Martins, J. Takahashi
USP/LAL, Bairro Butantan
- L.L. Verardi
IBILCE - UNESP, Sao Jose do Rio Preto, SP
|
|
| |
This work presents analytical and numerical results for the pressure field distribution along the axis of tubular geometries with arbitrary axisymmetric cross sections with an arbitrary time- and position-dependent gas source. Several areas of applied physics deal with problems in high-vacuum and ultra high-vacuum technology that present tubular form. In many cases one finds tubes with non uniform cross sections, like parts of particle accelerators, colliders, storage rings, gravitational antennas, and electron devices, like klystrons, electron microscopes, and also parts of vacuum systems in general, for instance, bellows, conical pipes and others. In this work one can get the detailed pressure distribution is not determined. This work presents and describes in detail the pressure field in tubes with arbitrary axisymetric cross sections. Details of the mathematical and physical formulations and modeling are given; specific conductance and specific throughput are defined; and a detailed discussion about the boundary conditions is given. These concepts and approach are applied to usual realistic cases, like conical tubes and bellows, with typical laboratory dimensions.
|
|