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Alvarez-Type Accelerating Structure


Alvarez-Type Accelerating Structure for Room-Temperature Part of the CERN SPL Project

Tech Area / Field

  • PHY-PFA/Particles, Fields and Accelerator Physics/Physics

8 Project completed

Registration date

Completion date

Senior Project Manager
Malakhov Yu I

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • ITEF (ITEP), Russia, Moscow

Project summary

The project goals (main objectives) are:
- development of the Alvarez-type (DTL) accelerating structures for room-temperature part (Linac 4) of the CERN SPL project;
- creation of a pilot prototype of the 1st DTL section for energy range 3 – 10 MeV for “hot” tests;
- development and manufacture of the drift tube with electromagnetic quadrupoles;
- beam dynamics simulations for optimization of the Linac 4 “end-to-end” design.

State of the art

The ever-increasing flux of secondary particles requested by different physics experiments can only be met using higher power proton beams. Superconducting Proton Linac (SPL) delivering a mean beam power of 4 MW is being considered at CERN as a potential front end for the proton driver of a neutrino factory. SPL can also be used for upgrade of LHC and in EURISOL project for generation of radio-active ion beams. SPL will consist of H- ion source, RFQ up to 3 MeV, DTL part up to 40 MeV, CCDTL sections up to 120 – 160 MeV and superconducting part up to 2.2 GeV. The room-temperature part of SPL with beam output energy 40 MeV can replace existing Linac 2 and is named as Linac 4.

For obtaining of the Linac 4 project parameters the DTL part should provides effective acceleration of the proton beam with 30 mA current, small particles losses, effective cooling and stable long-term operation. The beam should be matched with the next CCDTL cavities.

Statement of work

The project contemplates experimental investigation, design and testing of a pilot technology installation, as well as optimization of technological regimes. The main tasks (milestones) to be addressed are:

1. Development of DTL part of Linac-4 to reach the beam project parameters.

2. Development of the drift tubes with magnetic quadrupole lenses for DTL with necessary gradients, cooling efficiency and feasibility of construction.

3. End-to end beam dynamics simulations in Linac 4 for obtaining detailed information about evolution of beam parameters along Linac 4 taking into account perturbations caused by mechanical tolerances, misalignments etc.

4. Design, fabrication and testing of the 1st DTL cavity prototype and a pilot drift tube with electromagnetic quadrupole.

5. Marketing of the developed accelerating structures and codes for different accelerating projects both in Russia and world-wide.

6. Preparation of publications and final report.

The competence of the project participants is based on a wealth of experience accumulated throughout extensive previous work in the area of the high current proton, electron and heavy ion accelerators.

ITEP, Moscow, Russia is a leading Russian institute in leaner accelerators. It was the leadership of most of the accelerating projects, which were realized in former USSR (I-2, I-100 (Protvino), MMF (Troitsk)). ITEP successful collaborates with GSI, INFN-LNL, ANL and BNL in development and commissioning of the Linacs. It has all necessity experimental facilities to provide realization of the project goals as well as a number of top level experts in the fields of Linear accelerators.

RFNC-VNIIEF, Sarov, has great experience in the analysis of constructions condition of the physical plants by finite elements method, particularly in the analysis of electrical and mechanical strength, mechanical stability and thermodynamic conditions in the installations. This method was successfully used as under government contracts in Russia as well under international collaborations (ALICE experiment at CERN). VNIIEF has specialists having experience in physics and techniques of the accelerators and several resonance leaner accelerators (Linacs LU-50, LU-10-20) were designed and built.

Expected results:

1. Detailed design of DTL part of Linac 4 for beam acceleration in energy range from 3 MeV to 40 MeV.
2. Design and prototype of a drift tube with electromagnetic quadrupoles.and with permanent magnet quadrupoles.
3. Pilot prototype of the 1st DTL section for energy range 3 – 10 MeV for high power test at CERN.
4. Results of optimization of the Linac 4 design on the base of beam dynamics simulations.

Application of the results expected is associated with the outlook for significant advance of the following industrial areas.

1. Transmutation of the nuclear waste.
2. Utilization of weapon-grade plutonium.
3. Nuclear power production.
4. High current electronics.

The project meets ISTC goals and objectives.

1. Scientists who have been involved in the development of nuclear weapons will be allowed the possibility to re-direct their experience and effort to solving scientific and technological problems of civilian applications.

2. These scientists will be afforded additional opportunity of being integrated into the world scientific and civilian technology community via exchange of research results, participation in international conferences, as well as holding workshops involving specialists of leading foreign research centers.

3. Support will be provided to basic research and development of new environmentally-friendly power production technology.

Total project effort is 7634 man-days.


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