A Møller polarimeter for high energy electron beams

Band, H. R.; Mitchell, G. S.; Prepost, R.; Wright, T.

doi:10.1016/s0168-9002(97)00984-4

Cited by 30 publications

(15 citation statements)

References 11 publications

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“…(3) Møller (or for positron beams Bhabha) scattering [79] , i.e., scattering off the electrons in a target, used from a few 100 MeV to GeV energies in fixed target experiments at SLAC [80][81][82][83] and JLab [84] , but also at ELSA [85] and MAMI [86] . Precisions down to 0.5% can be reached [87] .…”

Section: Electron Polarimetrymentioning

confidence: 99%

Generation of polarized particle beams at relativistic laser intensities

Büscher

Hützen

et al. 2020

High Pow Laser Sci Eng

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The acceleration of polarized electrons, positrons, protons and ions in strong laser and plasma fields is a very attractive option for obtaining polarized beams in the multi-mega-electron volt range. Recently, there has been substantial progress in the understanding of the dominant mechanisms leading to high degrees of polarization, in the numerical modeling of these processes and in their experimental implementation. This review paper presents an overview on the current state of the field, and on the concepts of polarized laser–plasma accelerators and of beam polarimetry.

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Section: Electron Polarimetrymentioning

confidence: 99%

Generation of polarized particle beams at relativistic laser intensities

Büscher

Hützen

et al. 2020

High Pow Laser Sci Eng

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“…The MCA was calibrated using Cs-137 which has two internal conversion electron peaks at 624 keV and 655 keV which were detected in a 300 µm thick Silicon detector, thus 1 with threshold voltage of 50 mV and amplifier gain of 20 Schematic for characterization of detector prototype Response of prototype diamond detector assigning an energy value to each channel number of the MCA. Thereafter, the position of the Sr-90 peak in the diamond detector was identified to correspond to 8858 electrons per MIP (Figure 3.9).…”

Section: Characterizationmentioning

confidence: 99%

“…These include dead-time due to the hold off period in the DAQ that was introduced to match the shaping time of the readout electronics, the pseudo tracking algorithm used to identify electron tracks through the set of four detector planes and the trigger formation. Attempts were made to directly measure the inefficiency using the traditional method of varying 1 for opposite helicities …”

Section: Modelsim Simulation Of the Compton Daqmentioning

confidence: 99%

Determination of electron beam polarization using electron detector in Compton polarimeter with less than 1% statistical and systematic uncertainty

Narayan¹

2015

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Title of Study: Determination of electron beam polarization using electron detector inCompton polarimeter with less than 1% statistical and systematic uncertainty Pages of Study: 250Candidate for Degree of Doctor of PhilosophyThe Q-weak experiment aims to measure the weak charge of proton with a precision of 4.2%. The proposed precision on weak charge required a 2.5% measurement of the parity violating asymmetry in elastic electron -proton scattering. Polarimetry was the largest experimental contribution to this uncertainty and a new Compton polarimeter was installed in Hall C at Jefferson Lab to make the goal achievable.In this polarimeter the electron beam collides with green laser light in a low gain FabryPerot Cavity; the scattered electrons are detected in 4 planes of a novel diamond micro strip detector while the back scattered photons are detected in lead tungstate crystals. This diamond micro-strip detector is the first such device to be used as a tracking detector in a nuclear and particle physics experiment. The diamond detectors are read out using custom built electronic modules that include a preamplifier, a pulse shaping amplifier and a discriminator for each detector micro-strip. We use field programmable gate array based general purpose logic modules for event selection and histogramming. Extensive Monte Carlo simulations and data acquisition simulations were performed to estimate the systematic uncertainties. Additionally, the Moller and Compton polarimeters were cross calibrated at low electron beam currents using a series of interleaved measurements. In this dissertation, we describe all the subsystems of the Compton polarimeter with emphasis on the electron detector. We focus on the FPGA based data acquisition system built by the author and the data analysis methods implemented by the author. The simulations of the data acquisition and the polarimeter that helped rigorously establish the systematic uncertainties of the polarimeter are also elaborated, resulting in the first sub 1% measurement of low energy (∼1 GeV) electron beam polarization with a Compton electron detector. We have demonstrated that diamond based micro-strip detectors can be used for tracking in a high radiation environment and it has enabled us to achieve the desired precision in the measurement of the electron beam polarization which in turn has allowed the most precise determination of the weak charge of the proton.

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“…Møller polarimeters are widely used, e.g. in SLAC fixed target experiments and at the VEPP-3 storage ring (gas target) [8][9][10][11][12].…”

Section: Bhabha/møller Polarimetermentioning

confidence: 99%

Study on low-energy positron polarimetry

et al. 2007

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For the design of the International Linear Collider (ILC) a polarised positron source based on a helical undulator system has been proposed. In order to optimise the positron beam, i.e. to ensure high intensity as well as high degree of polarisation, a measurement of the polarisation close to the positron creation point is envisaged. In this contribution methods to determine the positron polarisation at low energies are investigated. These studies are based on simulations with an extended version of GEANT4, which allows the tracking of polarised particles taking into account the spin effects.

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A Møller polarimeter for high energy electron beams

Cited by 30 publications

References 11 publications

Generation of polarized particle beams at relativistic laser intensities

Generation of polarized particle beams at relativistic laser intensities

Determination of electron beam polarization using electron detector in Compton polarimeter with less than 1% statistical and systematic uncertainty

Study on low-energy positron polarimetry

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