Tuning and Pre-Beam Checkout of 805 MHz Side-Coupled Proton Linac Structures

Swain, G.R.; Jameson, Robert; Knapp, E.A.; Liska, D.J.; Potter, J. M.; Wallace, J.D.

doi:10.1109/tns.1971.4326129

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…50, this parameter is not critical for linac operation. Errors up to ±10% can be accepted without affecting significantly the beam dynamics, provided that the average tank fields, which are determined by the RF power level, are within ±1% of the correct value.…”

Section: Figures Of Merit Of the Field Distributionmentioning

confidence: 99%

High Frequency Linacs for Hadrontherapy

Amaldi¹,

Braccini

Puggioni³

2009

Rev. Accl. Sci. Tech.

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The use of radiofrequency linacs for hadrontherapy was proposed about 20 years ago, but only recently has it been understood that the high repetition rate together with the possibility of very rapid energy variations offers an optimal solution to the present challenge of hadrontherapy: "paint" a moving tumor target in three dimensions with a pencil beam. Moreover, the fact that the energy, and thus the particle range, can be electronically adjusted implies that no absorber-based energy selection system is needed, which, in the case of cyclotron-based centers, is the cause of material activation. On the other side, a linac consumes less power than a synchrotron. The first part of this article describes the main advantages of high frequency linacs in hadrontherapy, the early design studies, and the construction and test of the first high-gradient prototype which accelerated protons. The second part illustrates some technical issues relevant to the design of copper standing wave accelerators, the present developments, and two designs of linac-based proton and carbon ion facilities. Superconductive linacs are not discussed, since nanoampere currents are sufficient for therapy. In the last two sections, a comparison with circular accelerators and an overview of future projects are presented.

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Section: Figures Of Merit Of the Field Distributionmentioning

confidence: 99%

High Frequency Linacs for Hadrontherapy

Amaldi¹,

Braccini

Puggioni³

2009

Rev. Accl. Sci. Tech.

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“…3). This permitted some evaluation of the tuning techniques, the module cooling system and the rf control systems (Jameson and Wallace et al 1 1 J 7 O, .Jameson and Swain et al 1970, Swain et al 1971. The initial development of the computerized beadpull measurement of field distribution also was done during this time.…”

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confidence: 99%

LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation

Swain¹

1979

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In the course of construction of the 805-MH;; linac, it was necessary to set 10 000 resonant cavities to precise frequencies and to check, and in some cases, to adjust the field distribution along the beam axis of the 104 rf tanks composing the linac. Since this was the first proton linac of the side-coupled type ever built, it was necessary to develop new techniques and instrumentation for structure tuning. An outline of the fabrication and installation process is given, showing how the tuning operations were interwoven with the fabrication steps and indicating the relation of tuning to other installation and check-out activities. The steps of the tuning procedure are then examined in detail. Tools for tuning by dinging, nose-stretching, and septum bending are described. Techniques for frequency measurements and for beadpull measurements of field distribution are discussed. The section on field distribution measurement includes results of research on measurement procedure and theory and observations confirming the low-power stability of field distributions for a three-year period. Selected results from the theory of chains of coupled resonators are given. Coupled resonator model parameters and various measured parameters for the 305-MHz linac are tabulated. *i n/^ rn'xJ* f r ,-Ci«ity frrrj 800 BO? MM/. 8 l«'jm»nll t.-om«..ti lilrf! nnj) .liejd< bta/«d on K E. O R. l«vi I-•-~-fj>j 4. Machine ni>»« on Î _i!l^ J U>«i latht 1 I incttMS* half gjp I j 1 MM/ or 1-H l~-1 All d.irr>'.hflti Y "'!l"" : ni tin-. ty|i** X ' " AJI wijrncnu lor on* tdnk / M^rjunf fnt giv»;n half g'J I«JI M^yf (Jmu'/iijuns rf? 800 807 MM/ 8 N'umlx'r and itarnp arrow, witli Ui»CPf Uthe

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Status Report on LAMPF

Knapp

1971

IEEE Trans. Nucl. Sci.

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Tuning and Pre-Beam Checkout of 805 MHz Side-Coupled Proton Linac Structures

Cited by 4 publications

References 6 publications

High Frequency Linacs for Hadrontherapy

High Frequency Linacs for Hadrontherapy

LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation

Status Report on LAMPF

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