Continuous transmission line modeling for low and medium-energy linacs: DTL and RFQ. [DTL (Drift Tube Linac); RFQ (Radio Frequency Quadrupole)]
A continuous transmission line model is developed for the low and medium energy linacs. Drift Tube Linac is simulated as a waveguide that is operated at the TM[sub 010] mode. Radio Frequency Quadrupole has been treated as a waveguide that is operated at the TE[sub 210] mode. These waveguide are filled with a medium that is uniform, homogeneous, but not isotropic. The DTL can be seen as a cylindrical resonator filled with an electrically uniaxial medium with the optic axis along the accelerating axis. The RFQ can be treated as a cylindrical resonator filled with a magnetically uniaxial medium with its optic axis along the accelerating axis. The RFQ and the DTL have no explicit boundaries between cells and all cells are strongly coupled together. Unlike the coupled resonator model, this model considers the whole long linac tank as a uniform cylindrical resonator. Instead of separated resonators, all individual cells having the same resonant frequency are combined in a transmission line. To simulate a DTL, stems supporting the drift-tubes in the outer tank are treated as shunt inductances that have no effect on the constant current structure and little effect on the current ramp structure. An L-C circuit simulating the straight post coupler shows that the sensitivity to the perturbations can be reduced and accelerating fields can be stabilized in a constant field DTL. To stabilize fields in a ramped gradient DTL (RGDTL), bent posts are needed. These bent posts can be modeled by as their equivalent circuits. Ignoring the wall loss, there is a good agreement between the results obtained and the experimental results of J.H. Billen carrying in Los Alamos National Laboratory. Beam loading in DTL and RFQ can be dealt with by the use of resistive elements in transmission line representations. Feeding has been simulated by current sources with a shunt conductances.
- Research Organization:
- Polytechnic Univ., Brooklyn, NY (United States)
- OSTI ID:
- 7158425
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
Ta
43 PARTICLE ACCELERATORS
LINEAR ACCELERATORS
SIMULATION
WAVEGUIDES
POWER TRANSMISSION
DRIFT TUBES
QUADRUPOLE LINACS
RADIOWAVE RADIATION
RESONATORS
ACCELERATORS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
RADIATIONS
661220* - Particle Beam Production & Handling
Targets- (1992-)
430000 - Particle Accelerators