Measurement of longitudinal phase space in an accelerated H− beam using a laser-induced neutralization method

Yuan, V. W.; Connolly, R.; Garcia, R.; Johnson, K.F.; Saadatmand, K.; Sander, O.R.; Sandoval, D.P.; Shinas, Michael A.

doi:10.1016/0168-9002(93)91273-p

Cited by 19 publications

(9 citation statements)

References 1 publication

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“…Phase spread of Hbeams can also be measured using cw mode-locked lasers (12). In this method, very short laser pulses, synchronized with the beam microstructure, are used to neutralize 20 ps temporal "slices" of the Hmicrobunches.…”

Section: Possible Experimental Layouts and Measurementsmentioning

confidence: 99%

Laser diagnostic for high current H[sup −] beams

Shafer

1998

AIP Conference Proceedings

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In the last 5 years, significant technology advances have been made in the performance, size, and cost of solid-state diode-pumped lasers. These developments enable the use of compact Q-switched Nd:YAG lasers as a beam diagnostic for high current Hbeams. Because the threshold for photodetachment is only 0.75 eV, and the maximum detachment cross section is 4 ˝ 10-17 cm 2 at 1.5 eV, A 50 mJ/pulse Q-switched Nd:YAG laser can neutralize a significant fraction of the beam in a single 10 ns wide pulse. The neutral beam maintains nearly identical parameters as the parent Hbeam, including size, divergence, energy, energy spread, and phase spread. A dipole magnet can separate the neutral beam from the Hbeam to allow diagnostics on the neutral beam without intercepting the high-current Hbeam. Such a laser system can also be used to extract a low current proton beam, or to induce fluorescence in partially stripped heavy ion beams. Possible beamline diagnostic systems will be reviewed, and the neutral beam yields will be calculated.

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Section: Possible Experimental Layouts and Measurementsmentioning

confidence: 99%

Laser diagnostic for high current H[sup −] beams

Shafer

1998

AIP Conference Proceedings

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“…One method that may be of use for SNS is what one might call a laser beam probe (18,19,20). This method uses a laser of sufficient power, wavelength, and focused size to photodetach one of the electrons from the H -ion.…”

Section: Other Less Applicable Profile Measurement Techniquesmentioning

confidence: 99%

Techniques for intense-proton-beam profile measurements

Gilpatrick¹

1998

AIP Conference Proceedings

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Abstract. In a collaborative effort with industry and several national laboratories, the Accelerator Production of Tritium (APT) facility and the Spallation Neutron Source (SNS) linac are presently being designed and developed at Los Alamos National Laboratory (LANL). The APT facility is planned to accelerate a 100 mA H + cw beam to 1.7 GeV and the SNS linac is planned to accelerate a 1 to 4 mA-average, H -, pulsed-beam to 1 GeV. With typical rms beam widths of 1 to 3 mm throughout much of these accelerators, the maximum average-power densities of these beams are expected to be approximately 30 and 1 MW-per-square millimeter, respectively. Such power densities are too large to use standard interceptive techniques typically used for acquisition of beam profile information. This paper will summarize the specific requirements for the beam profile measurements to be used in the APT, SNS, and the LowEnergy Development Accelerator (LEDA) -a facility to verify the operation of the first 20 MeV section of APT. This paper will also discuss the variety of profile measurement choices discussed at a recent high-average-current beam profile workshop held in Santa Fe, NM, and will present the present state of the design for the beam profile measurements planned for APT, SNS, and LEDA.

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“…Laserwire diagnostics for measuring an H − beam were originally built at Los Alamos National Laboratory [2,3], and subsequently developed at facilities including the Brookhaven National Laboratory LINAC [4], and the Spallation Neutron Source at Oak Ridge National Laboratory [5,6], and more recently considered for future applications such as the Front End Test Stand (FETS) at Rutherford Appleton Laboratory, UK [7,8].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a laserwire emittance scanner for hydrogen ion beams at CERN

Hofmann

Kruchinin

Bosco

et al. 2015

Phys. Rev. ST Accel. Beams

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A noninvasive, compact laserwire system has been developed to measure the transverse emittance of an H − beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fiber to collide with the H − beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H − beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method.

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Measurement of longitudinal phase space in an accelerated H− beam using a laser-induced neutralization method

Cited by 19 publications

References 1 publication

Laser diagnostic for high current H[sup −] beams

Laser diagnostic for high current H[sup −] beams

Techniques for intense-proton-beam profile measurements

Demonstration of a laserwire emittance scanner for hydrogen ion beams at CERN

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