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Abstracts Brochure - CERN

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THPPA — Prize Presentations 29-Jun-06 14:00 - 15:30<br />

THPPA — Prize Presentations<br />

High-Gradient Superconducting Radiofrequency Cavities for Particle Acceleration<br />

The development of radiofrequency superconductivity<br />

for particle acceleration has L. Lilje (DESY)<br />

reached a level where many projects consider<br />

its use. One of the many attractive features of these accelerating structures is to achieve very high accelerating fields<br />

efficiently. The technology has been developped to a stage where accelerating gradients of more than 25 MV/m<br />

are being implemented in accelerator modules. In single-cell test resonators even higher gradients were already<br />

achieved. To operate cavities at these gradients efficiently their frequency needs to be kept stable to reduce the need<br />

for an overhead in radiofrequency power. Introducing active elements like piezoelectric actuators allows to achieve<br />

these goals.<br />

The First CW Accelerator in USSR and a Birth of Accelerating Field Focussing<br />

As CW linear accelerators became required,<br />

it appeared an absolute necessity to change V.A. Teplyakov (IHEP Protvino) R.A. Jameson (IAP)<br />

the initial part of the accelerator. The initial<br />

part should prepare bunches of charged particles for the further acceleration in the main part. The CW accelerator<br />

should also be economic and reliable. The problem was solved using the principles of adiabatic capture of particles<br />

and low energy injection with focusing by means of the RF field. The acceleration of bunches with non-increasing<br />

charge density was the basic idea. It allowed reduction of the injection energy without reducing the current. By 1972,<br />

initial testing in IHEP Protvino was accomplished, and the first accelerated beam was obtained in an RFQ. The URAL-<br />

30 proton linac was commissioned in 1977 in IHEP. It applies RFQ-focusing from injection up to the top energy of 30<br />

MeV. From 1985 until the present, this facility routinely operates as an injector to a booster proton synchrotron, this<br />

feeding the entire accelerator complex of ITEP. Development of the first RFQ in the Western world was started at Los<br />

Alamos in 1978 and performed a proof-of-principle test in 1980. After that there were many articles and reports and<br />

the RFQ became widely known in the world.<br />

Chair: N. Angert (GSI, Darmstadt) 379<br />

THPPA02<br />

THPPA03

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