摘要 :
The technical note presents an efficient method for determination of the polarimeter response function of the Advanced Stokes Polarimeter (ASP). The design of the calibration optics in the ASP and this calibration technique have e...
展开
The technical note presents an efficient method for determination of the polarimeter response function of the Advanced Stokes Polarimeter (ASP). The design of the calibration optics in the ASP and this calibration technique have evolved from those developed and used in two previous instruments, Stokes I and Stokes II (Baur, undated, 1975). The technique presented in those memoranda was modified in practice for the use of polymer linear polarizers instead of double tilted glass plates. The author's understanding of the later technique comes from familiarity with the FORTRAN calibration code resident with the Stokes I and II instruments. The basic similarity of the technique presented here to that used in Stokes I and II is the use of 'known' calibration optical elements placed in the beam ahead of the polarization analyzing optics. These optical elementsproduce predominantly + or - Q, + or - U, + or - V, unpolarized light and no light. Observations made in these configurations are then used to compute the response of the polarimeter to a given input Stokes vector.
收起
摘要 :
The RHIC polarimeter data have exhibited behavior suggesting that systematic effects are present at a level comparable to the statistical uncertainty per run, or(approx) 4 x 10(sup 4): in the physics asymmetries and somewhat large...
展开
The RHIC polarimeter data have exhibited behavior suggesting that systematic effects are present at a level comparable to the statistical uncertainty per run, or(approx) 4 x 10(sup 4): in the physics asymmetries and somewhat larger in the luminosity asymmetries. This corresponds to an error in the polarization of approximately(delta)P(approx)(+-) 0.03. Two effects are studied that might explain some of the observations, both based on detector rates. The results may explain the systematic effects in both the physics and the luminosity asymmetries. The first effect is caused by the presence of both a background and a good p+ C elastic scattering event in the same passage of a bunch through the polarimeter target. The second effect similarly depends on the presence of multiple p+ C elastic events from the same bunch. If these rate effects become large enough (or if(delta)P(approx)(+-) 0.03 continues and the beam polarization is less than 0.60) they could prevent determination of the beam polarization to(delta)P/P=(+-) 5% unless a correction can be determined to the measured asymmetries.
收起
摘要 :
The RHIC polarimeter data have exhibited behavior suggesting that systematic effects are present at a level comparable to the statistical uncertainty per run, or(approx) 4 x 10(sup 4): in the physics asymmetries and somewhat large...
展开
The RHIC polarimeter data have exhibited behavior suggesting that systematic effects are present at a level comparable to the statistical uncertainty per run, or(approx) 4 x 10(sup 4): in the physics asymmetries and somewhat larger in the luminosity asymmetries. This corresponds to an error in the polarization of approximately(delta)P(approx)(+-) 0.03. Two effects are studied that might explain some of the observations, both based on detector rates. The results may explain the systematic effects in both the physics and the luminosity asymmetries. The first effect is caused by the presence of both a background and a good p+ C elastic scattering event in the same passage of a bunch through the polarimeter target. The second effect similarly depends on the presence of multiple p+ C elastic events from the same bunch. If these rate effects become large enough (or if(delta)P(approx)(+-) 0.03 continues and the beam polarization is less than 0.60) they could prevent determination of the beam polarization to(delta)P/P=(+-) 5% unless a correction can be determined to the measured asymmetries.
收起
摘要 :
A review of data on the nucleon electro-weak form factors in the space-like region is presented. Recent results from experiments using polarized beams and either polarized targets or nucleon recoil polarimeters have yielded a sign...
展开
A review of data on the nucleon electro-weak form factors in the space-like region is presented. Recent results from experiments using polarized beams and either polarized targets or nucleon recoil polarimeters have yielded a significant improvement on the precision of the electromagnetic data obtained with the traditional Rosenbluth separation. An outlook is presented of planned experiments.
收起
摘要 :
There has been concern about the analyzing power of the p-Carbon polarimeter at the end of 200 MeV LINAC of BNL. A new polarimeter based on proton-deuteron scat- tering was installed and we have repeated the calibration of proton-...
展开
There has been concern about the analyzing power of the p-Carbon polarimeter at the end of 200 MeV LINAC of BNL. A new polarimeter based on proton-deuteron scat- tering was installed and we have repeated the calibration of proton-Carbon scattering at 12 degrees and 200 MeV against proton-deuteron scattering. The result is consistent with the value of A=O.62 now used to measure the beam polarization at the end of the LINAC.
收起
摘要 :
In this poster we describe progress in the development polarization sensitive superconducting, bolometric detector arrays targeted at Cosmic Microwave Background (CMB) studies.
摘要 :
The sections written by this author are: 2.7.1- Thomas - BMT equation; 2.2.2- Spinor Algebra; 2.7.3- Spin Rotators and Siberian Snakes; 2.7.4- Ring with Spin Rotator and Siberian Snakes; 2.7.5- Depolarizing Resonances and Spin Fli...
展开
The sections written by this author are: 2.7.1- Thomas - BMT equation; 2.2.2- Spinor Algebra; 2.7.3- Spin Rotators and Siberian Snakes; 2.7.4- Ring with Spin Rotator and Siberian Snakes; 2.7.5- Depolarizing Resonances and Spin Flippers; & 7.6.2- Proton Beam Polarimeters.
收起
摘要 :
The science of measuring the polarization state of light is called polarimetry. There are two type of polarmeters: (1) those that actively irradiate an object with light of known polarization and (2) those that passively record ra...
展开
The science of measuring the polarization state of light is called polarimetry. There are two type of polarmeters: (1) those that actively irradiate an object with light of known polarization and (2) those that passively record radiation emitted and/or reflected by objects. Polarimeters in the thermal infrared (midwave infrared (MWIR)) are just becoming available, and accuracy and calibration issues are yet to be determined experimentally. The polarization effects of the instrument that measures light must be fully known, as well as the intervening atmosphere or media. In each case, a Mueller matrix can be used to describe instrumental and other effects. In addition, the polarimeter must be able to determine all Stokes parameters of the radiation at the instrument's entrance pupil. Such a polarimeter is known as a 'complete' polarimeter. The subject of this report is the construction and experiments with a complete imaging polarimeter. Stokes parameters can be used to describe light that is partially polarized. The first Stokes parameter, typically labeled So, represents the total irradiance recorded from an instantaneous field of view. The second Stokes parameter, S1, represents the preference of the collected radiation for horizontal versus vertical polarization. A positive value of S1 indicate horizontal polarization. The third Stokes parameter, S2, represents the preference of the collected radiation for linear polarization oriented along 45degrees and 135degrees measured with respect to the horizontal direction. A positive value of S2 indicates 45degree linear polarization. The fourth Stokes parameter, S3 indicates right-circular polarization. Polarimeters can be also divided into two classes: (1) time-sequential or (2) snapshot. The time-sequential polarimeter measures Stokes parameters by employing one or more rotating polarization elements. A snapshot polarimeter measures Stokes parameters by aperture of amplitude division. All parameters are measured simultaneously. In this report, we describe a time-sequential imaging polarimeter that employs a rotating form-birefringent retarder element. The extension of polarimetry from the visible to the MWIR and long-wave infrared (LWIR) has been limited by the lack of IR polarizers and retarders. Also, in analogy to spectral imaging, the relatively recent availability of large-format MWIR imaging arrays is enabling an exploration of polarization's value in target and anomaly detection.
收起
