Design and study of an enhanced Faraday cup detector

Naieni, Ali Kashefian; Bahrami, Flora; Yasrebi, Navid; Rashidian, Bizhan

doi:10.1016/j.vacuum.2009.01.005

Cited by 28 publications

(12 citation statements)

References 7 publications

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“…Moreover, one can see that the highest energy at which C 5+ (A/Z ≈ 2.4) is still separated from its adjacent O 7+ (A/Z ≈ 2.29) track is ≈6 MeV/nucleon, which agrees well with the formula for (A/Z) given in Eq. (6). Similarly, the energy at which Au 40+ is still separated from the next charge state of Au (i.e., Au 41+ ), corresponding to (A/Z) = 0.12, is ≈1.5 MeV/nucleon.…”

Section: Increasing Species Separationmentioning

confidence: 94%

“…Diagnosing and characterising spectra of individual ion species is key to understanding the underlying acceleration mechanisms, such as TNSA, RPA, BOA, etc., which are currently the object of extensive experimental investigations. Among ion diagnostics routinely used in such experiments, such as Radiochromic film stack detectors, 4 nuclear activation techniques 5 and Faraday cups, 6 Thomson Parabola Spectrometers (TPS) are particularly useful as different ion species are dispersed in energy and mass-to-charge (A/Z) ratio by means of static electric and magnetic fields. [7][8][9] Implementation of the diagnostic and data analysis are also relatively simple and straightforward.…”

Section: Introductionmentioning

confidence: 99%

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Modified Thomson spectrometer design for high energy, multi-species ion sources

Gwynne

Kar

Doria

et al. 2014

Review of Scientific Instruments

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A modification to the standard Thomson parabola spectrometer is discussed, which is designed to measure high energy (tens of MeV/nucleon), broad bandwidth spectra of multi-species ions accelerated by intense laser plasma interactions. It is proposed to implement a pair of extended, trapezoidal shaped electric plates, which will not only resolve ion traces at high energies, but will also retain the lower energy part of the spectrum. While a longer (along the axis of the undeflected ion beam direction) electric plate design provides effective charge state separation at the high energy end of the spectrum, the proposed new trapezoidal shape will enable the low energy ions to reach the detector, which would have been clipped or blocked by simply extending the rectangular plates to enhance the electrostatic deflection.

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Section: Increasing Species Separationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Modified Thomson spectrometer design for high energy, multi-species ion sources

Gwynne

Kar

Doria

et al. 2014

Review of Scientific Instruments

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“…It must be designed to stop the beam, suppress secondary electron emission and recapture back scattered electrons. The shape and the material of the FC may differ depending on the beam conditions and applications [19][20][21][22] and can be optimized by simulating the beam interaction with the stopper [23,24].…”

Section: Charge Measurement Systemmentioning

confidence: 99%

Beam characterization at the KAERI UED beamline

Setiniyaz

Kim

Baek

et al. 2016

Journal of the Korean Physical Society

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The UED (ultrafast electron diffraction) beamline of the KAERI's (the Korea Atomic Energy Research Institute's) WCI (World Class Institute) Center has been successfully commissioned. We have measured the beam emittance by using the quadrupole scan technique and the charge by using a novel measurement system we have developed. In the quadrupole scan, a larger drift distance between the quadrupole and the screen is preferred because it gives a better thin-lens approximation.A high bunch-charge beam, however, will undergo emittance growth in the long drift caused by the space-charge force. We present a method that mitigates this growth by introducing a quadrupole scan with a short drift and without using the thin-lens approximation. The quadrupole in this method is treated as a thick lens, and the emittance is extracted by using the thick-lens equations.Apart from being precise, our method can be readily applied without making any change to the beamline and has no need for a big drift space. For charge measurement, we have developed a system consisting of an in-air Faraday cup (FC) and a preamplifier. Tests performed utilizing 3.3-MeV electrons show that the system was able to measure bunches with pulse durations of tens of femtoseconds at 10 fC sensitivity.

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“…It should be mentioned that in bevelled and semi-cylindrical FC, a lower suppressor voltage is needed to suppress ejected electrons Table 1 Backscatter electron loss reduction techniques in FC (Refs. [1,4] [14]. Cone structure type is the fourth FC design in this category.…”

Section: Structure Optimization and Final Designmentioning

confidence: 99%