RF systems for the NLCTA

Wang, J.W.; Adolphsen, C.; Atkinson, Robert D.; Baumgartner, W.; Eichner, J.; Fuller, R.; Gold, S.; Hanna, S.M.; Holmes, S.; Koontz, R.F.; Lavine, T. L.; Loewen, R.J.; Miller, R.H.; Nantista, C.; Pope, R.; Rifkin, J.; Ruth, Relinda; Tantawi, Sami; Vlieks, A.E.; Wilson, P.B.; Wilson, Z.; Yeremian, A.D.

doi:10.1109/pac.1997.753102

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Independent phase and amplitude control is available for each of the RF components in the injector [4]. According to simulation predictions a gap voltage of 8 and 30 KV is required in the first and second X-band prebunchers respectively for optimum bunching.…”

Section: Beamline Setupmentioning

confidence: 99%

“…The magic-T type phase-shifter/attenuator for the prebunchers [4] currently do not operate in an orthogonal fashion, because the prebunchers are overcoupled and are not matched to their respective magic-T. This makes it very difficult to tune the bunching parameters of the beam.…”

Section: Vacuum Valvementioning

confidence: 99%

“…Bunch to bunch energy and energy spread variations are measured at the end of the machine close to the final dump using a pulsed bend magnet with a ramped current to sweep the bunch train vertically for the duration of the pulse, while a DC bend magnet bends the bunches in the horizontal plane allowing the measurement of the energy spread, from the head to the tail of the train [5]. A bunch length monitor [4,9] after the first accelerator section is used to set the power and phase of the two prebunchers with respect to the first accelerator section for optimum bunching. The bunch length is not measured directly but is inferred from the minimum energy spread achievable as seen on the dispersion screen in the chicane and at the end of the linac.…”

Section: Vacuum Valvementioning

confidence: 99%

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NLCTA injector experimental results

Yeremian

Adolphsen

Miller

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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The purpose of the Next Linear Collider Test Accelerator (NLCTA) at SLAC is to integrate the new technologies of X-band accelerator structures and RF systems for the Next Linear Collider (NLC), demonstrate multibunch beam-loading energy compensation and suppression of higher-order deflecting modes, measure the transverse components of the accelerating field, and measure the dark current generated by RF field emission in the accelerator [1]. For beam loading R&D, an average current of about 1 A in a 120 ns long bunch train is required. The initial commissioning of the NLCTA injector, as well as the rest of the accelerator have been progressing very well. The initial beam parameters are very close to the requirement and we expect that injector will meet the specified requirements by the end of this summer.

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Section: Beamline Setupmentioning

confidence: 99%

Section: Vacuum Valvementioning

confidence: 99%

Section: Vacuum Valvementioning

confidence: 99%

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NLCTA injector experimental results

Yeremian

Adolphsen

Miller

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Beam loading compensation in the NLCTA

Adolphsen

Lavine²,

Nantista³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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In the design of the Next Linear Collider (NLC), multibunch operation is employed to improve efficiency at the cost of substantial beam loading. The RF pulse that powers the accelerator structures will be shaped to compensate for the effect of the transient loading along the bunch train. This scheme has been implemented in the Next Linear Collider Test Accelerator (NLCTA), a facility built to test the key accelerator technology of the NLC. In this paper we describe the compensation method, the techniques used to measure the energy variation along the bunch train, and results from tests with NLC-like beam currents.

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Radiation protection in the NLC test accelerator at SLAC

Lavine

Vylet²

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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This report describes the ionizing radiation protection and safety issues in the design of the Next Linear Collider Test Accelerator (NLCTA), a high-gradient, 1-GeV, Xband linac at SLAC. INTRODUCTIONThe Next Linear Collider Test Accelerator (NLCTA) is a high-gradient, X-band linac at SLAC designed to validate 2.6-cm microwave linear accelerator technology for a future high-energy linear collider (the Next Linear Collider).' This report describes the ionizing radiation protection and safety issues in the design of the NLCTA, including power limits, shielding, and safety systems.* The NLCTA beam line ( Fig. 1) consists of an injector, chicane, linac, and spectrometer. The injector contains a 3-A, 1 50-kV, pulsed thermionic-cathode gun and two 0.9-m-long X-band accelerator ~ections.~ The sections are energized by a single 50-MW klystron, and boost the beam energy by up to 90 MeV (50 MV/m). The gun pulse has 0.125-ps duration. The repetition rate is

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RF systems for the NLCTA

Cited by 3 publications

References 5 publications

NLCTA injector experimental results

NLCTA injector experimental results

Beam loading compensation in the NLCTA

Radiation protection in the NLC test accelerator at SLAC

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