Characterisation of the PXIE Allison-type emittance scanner

D’Arcy, Richard; Alvarez, M.; Gaynier, John; Prost, L.; Scarpine, V.; Shemyakin, A.

doi:10.1016/j.nima.2016.01.039

Cited by 9 publications

(12 citation statements)

References 5 publications

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“…Typically, Allison scanners are used for characterization of ion beams at energies of tens of keV (e.g. [7], [8]), which is also the case for the PIP2IT LEBT Allison scanner [9]. In the MeV-range, most ion accelerators to date use the so-called double-slit (e.g.…”

Section: Allison Scanner a Working Principlementioning

confidence: 99%

Measurements of a 2.1 MeV H− beam with an Allison scanner

Richard

Alvarez

Carneiro

et al. 2020

Review of Scientific Instruments

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Transverse 2D phase space distribution of a 2.1 MeV, 5 mA H − beam is measured at the PIPIT test accelerator at Fermilab with an Allison scanner. The paper describes the design, calibration, and performance of the scanner as well as the main results of the beam measurements. Analyses of the recorded phase portraits are performed primarily in action-phase coordinates; the stability of the action under linear optics makes it easier to compare measurements taken with different beamline conditions, e.g. in various locations. The intensity of a single measured point ("pixel") is proportional to the phase density in the corresponding portion of the beam. When the Twiss parameters are calculated using only the high-phase density part of the beam, the pixel intensity in the beam core is found to be decreasing exponentially with action and to be phase-independent. Outside of the core, the intensities decrease with action at a significantly slower rate than in the core. This 'tail' comprises 10-30% of the beam, with 0.1% of the total measured intensity extending beyond the action 10-20 times larger than the rms emittance. The transition from the core to the tail is accompanied by the appearance of a strong phase dependence, which is characterized in action-phase coordinates by two 'branches' extending beyond the core. A set of selected measurements shows, in part, that there is no measurable emittance dilution along the beam line in the main portion of the beam; the beam parameters are practically constant over a 0.5 ms pulse; and scraping in various parts of the beam line is an effective way to decrease the transverse tails by removing the branches.

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Section: Allison Scanner a Working Principlementioning

confidence: 99%

Measurements of a 2.1 MeV H− beam with an Allison scanner

Richard

Alvarez

Carneiro

et al. 2020

Review of Scientific Instruments

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“…Because of its accuracy and fast measurements, it is usually considered a preferable choice for ion beams at the lower energies typically in range of a few hundreds of kilo electron volts. Like the PIP2IT-LEBT where the Allison scanner [30] is used for a 30 keV Hion beam. To enable its use at 2.1 MeV, front slit plates, made of a molybdenum alloy TZM, are bolted to a stainless-steel water-cooled block with a graphite foil wedged between them.…”

Section: Transverse Beam Emittance Measurementmentioning

confidence: 99%

Beam tests of the PIP-II Injector Test Radio Frequency Quadrupole

Saini

Hanna

Huber

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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In modern high intensity ion-particle accelerators, a Radio Frequency Quadrupole (RFQ) is utilized to prepare a highquality beam for injection to the main accelerating section. Since an RFQ governs the initial beam parameters, characterization of the beam coming out from the RFQ is foremost step toward commissioning of an accelerator facility. It allows validating the RFQ design as well as attaining a better understanding of charged-particle beams. This paper describes the beam-performance of the Proton Improvement Plan-II Injector Test (PIP2IT) Continuous Wave (CW) four vane-type RFQ. It is designed to operate at a frequency of 162.5 MHz and accelerate a nominal Hbeam of 5 mA from 30 keV to 2.1 MeV. The paper details beam tests performed to validate the RFQ design specifications for transmission, beam kinetic energy and, RMS emittances. The paper also presents beam profile measurements and implication of the beam-jitters on the effective beam emittance at the RFQ exit.

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“…Therefore, to reduce the probability of single event upset in this system, the Verilog HDL (Hardware Description Language) and the design of the peripheral circuit for the FPGA have been continuously modified and optimized. The PXIe connector is used to transmit the FPGA's output data to the NI chassis with transmission speeds that can reach up to 2.5 Gb/s [1,3,14,15,16,17,18,19]. The connection circuit diagram of FPGA and PXIe is presented in Fig.…”

Section: Fpga and Pxie Connection Circuitmentioning

confidence: 99%

PXIe-based multi-channel data acquisition system of soft X-ray camera

Liu

et al. 2019

IEICE Electron. Express

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Soft X-ray cameras will be widely used in the ITER (International Thermonuclear Experimental Reactor) diagnostic system. To acquire their output data to display the signal changes on a computer, a PXIe (PCI Express eXtensions for Instrumentation)-based multi-channel data acquisition system for a soft X-ray camera has been designed and is presented in this paper. The Xilinx FPGA (Field-Programmable Gate Array) chip Kintex7-325T-900-2 is adopted as a controller in this system. The hardware's composition and the PXIe bus transmission of this system are presented and discussed. The acquisition and transmission of the soft X-ray camera's multi-channel data has been accomplished with subsequent processing. Currently, this system can collect signals within 1 MHz, and the system's signal resolution has achieved 0.122 mV.

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Characterisation of the PXIE Allison-type emittance scanner

Cited by 9 publications

References 5 publications

Measurements of a 2.1 MeV H− beam with an Allison scanner

Measurements of a 2.1 MeV H− beam with an Allison scanner

Beam tests of the PIP-II Injector Test Radio Frequency Quadrupole

PXIe-based multi-channel data acquisition system of soft X-ray camera

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