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High-Effective Accelerating Modul

#A-758


The Prototype of the High-Effective Accelerating Module on the Base of Bicylindrical Cavity

Tech Area / Field

  • PHY-RAW/Radiofrequency Waves/Physics

Status
3 Approved without Funding

Registration date
26.06.2001

Leading Institute
A.I. Alikhanyan National Science Laboratory, Armenia, Yerevan

Collaborators

  • Brookhaven National Laboratory, USA, NY, Upton\nLos Alamos National Laboratory, USA, NM, Los-Alamos\nLawrence Berkeley National Laboratory, USA, CA, Berkeley

Project summary

The main goals of the Project are:

– development, construction and manufacturing of the bicylindrical cross-section cavity’s prototype and study its parameters as an accelerating module having high transformation ratio of the field strength (k >2);

– development of the calculation technique of bicylindrical cross-section disk-loaded travelling wave waveguide as an analogue of high-gradient accelerating section of electron linear accelerators and the optimization its cross-section’s form at maximum of transformation ratio for using in two-beam acceleration scheme.

Such statement of the problem is connected with the fact that presently two fundamental problems in the field of accelerator technique have to be solved: the increase of acceleration rate and the increase of accelerated particles intensity (current). Both problems directly determine the cost of new accelerators construction and operation.

Earlier we have developed a calculating-theoretical base for accelerating structures with high rate of acceleration and for high-power generators of coherent electromagnetic radiation. The obtained results of the investigations of such module ensured us in good perspectives of the module if used in both traditional and two-bunch acceleration schemes.

Preliminary experimental investigation of such module confirmed the correctness of our methods and calculation technique, as well as the reality of obtaining high coefficient of transformation. Thus, at big cylinder radius values r1=4.4952, for the small one – r2=4.0457 the distance between centers d=8.0914, the value of transformation coefficient was obtained as | k |=5.03 at the frequency equal to 2.7972 GHz (the working frequency of the YerPhI linacs). Such high experimental value of transformation coefficient calls forth the barest necessity of preparation and fulfillment of full-scale experimental study.

So, the main task of the Project is the creation of high-gradient accelerating module with high transformation ratio, which in our case, may be represented as a ratio of the maximum value of longitudinal component Ez2 on axis along the accelerating beam passage to the maximum value of the field towards the axis along the driver bunch motion, either the module of a strange generator is excited Ez1 (|k|=|Ez2| / Ez1|). High transformation ratio is realized at the use of spatially separated trajectories of driving and accelerated beams and an asymmetry of module cross-section.

At the certain ratio of the driving and accelerated beams` currents the efficiency of energy transfer from the radiating beam to accelerated one can be up to 85%.

Thus, in the development of the results obtained, we plan:

1. To design and make the prototype of bicylindrical cavity module with high transformation ratio (K~) in the range of 3 GHz.

2. To measure its electromagnetic features (first of all the transformation ratio, Q-factor, resonant frequency and the field distribution along the direct, joining axis of cylinders with radii r1 and r2) and also to measure fields on the first and second axes, at the module excitation by the beam of electron linac.

3. To apply the developed technique of calculation for bicylindrical cross section disk-loaded travelling wave waveguide as an analogue of high-gradient accelerating section of linear accelerators and optimization of its cross-section geometry (form and size) according to the maximum of field strength transformation ratio.

The proposed Project complies with requirements and corresponds to the status of ISTC and necessitated by creation of alternatives for scientists and engineers and technical personnel, previously worked in the USSR (1978-1990) in the military field of industry.


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