Performance of a Ge-microstrip imaging detector and polarimeter

Abstract

Using 98% linearly polarized radiation at the European Synchrotron Radiation Facility in Grenoble, the performance of a prototype two-dimensional microstrip Ge(i) detector for x-ray imaging and as a Compton polarimeter has been evaluated. Using the energy and position sensitivity of the detector, the ability to obtain a complete reconstruction of the Compton event has been demonstrated. The modulation coefficient of the polarimeter is in good agreement with the theoretical limit of a perfect detector.

Hyperfine-induced effects on the linear polarization ofKα1emission from heliumlike ions

“…For electron-impact excited helium-like Sc 19+ ions, for example, the linear polarization of the characteristic Kα lines was found to be strongly affected by the hyperfine interaction and, hence, the nuclear properties [8][9][10]. Recent advances in x-ray detector techniques [11][12][13][14][15][16][17][18][19] suggest that high-precision polarization measurements of hyperfine transitions are possible in the near future and may provide a very promising route for probing the properties of stable and radioactive isotopes. When performed at ion storage rings, such measurements will become feasible not only for low-and medium-Z elements but also for heavy, few-electron ions [20][21][22].…”

Spin effects probed by Rayleigh X-ray scattering off hydrogenic ions

“…Hydrogenic atom irradiated by energetic light is considered in the ground state. Incident (scattered) photons have energies E γ 1(2) = ω 1(2) , propagation vectors k 1 (2) and polarization unit vectorŝ ǫ 1 (2) , where is the reduced Planck constant. For both, the incident and scattered photons,ǫ is assumed to be either linear (ǫ l χ ) or circular (ǫ c λ ).…”

“…Understanding the effects that spin induces to physical phenomena is of great importance in many branches of applied science and technology like quantum communications, astronomy, chemistry, electronics and so on. Owing to the recent advances in x-ray polarization sensitive detectors [1][2][3], tunable polarization and orbital angular momentum (OAM) free-electron lasers (FELs) [4][5][6][7] as well as synchrotron radiation sources [8], an increasing demand for accurate theoretical prediction on polarization-dependent atomic phenomena is arising. On the other hand, due to the recent progresses in storage rings and trapping techniques the scattering of light by ionic targets is of special interest nowadays since it allows us to obtain information about electron-photon interactions as well as atomic structures in the presence of strong Coulomb field.…”

Polarization reconstruction algorithm for a Compton polarimeter

“…These devices employ a detector technology that has been continuously improved over the last two decades [9,10,11]. In this report we will briefly present the technique of polarization measurements with such detectors and then focus on the present status of the analysis of possible systematic uncertainties introduced by our reconstruction method for the incident X-ray (linear) polarization.…”

“…[12]. Within the SPARC collaboration several double-sided segmented X-ray detectors were constructed as dedicated Compton polarimeters [10,11,13]. They provide good detection efficiency, energy and time resolution together with millimeter to submillimeter two-dimensional position resolution and a large detection area.…”