A Møller polarimeter for CW and pulsed intermediate energy electron beams

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

“…Two quadrupoles separated the scattered electrons from the beam. Elastic electron-electron scattering coincidences were used to determine the beam polarization, from the well-known double spin asymmetry [85]. The Møller measurements typically had a statistical uncertainty of 1% and a systematic uncertainty of ∼2-3% [11].…”

Moller polarimetry with atomic hydrogen targets

“…To keep the gas density constant, the losses have to be compensated by constantly feeding the cell with atomic hydrogen at a very moderate rate of . The balance condition is (4) where is the gas density. The parameter [see (2)] depends on the density.…”

“…Also, the dead time prevents running at high beam currents, along with target heating described above. It is difficult to use a ferromagnetic target thinner than [4][5] ; therefore, the counting rate can be reduced only by reducing the polarimeter acceptance. Unfortunately, this increases the error coming from the Levchuk effect.…”

“…The recombination rates are discussed quantitatively in Section II-D 3. Teflon has a relatively small sticking coefficient for hydrogen atoms 4. This parameter is called concentration, but we will use the word density in the text, since the mass of the gas is not important here 5.…”

A high-finesse Fabry–Perot cavity with a frequency-doubled green laser for precision Compton polarimetry at Jefferson Lab

“…A key part of the JLab physics program consists of highprecision parity violating electron scattering experiments [1][2][3] that require a fast and precise electron beam polarization measurement. Conventional polarimetry techniques such as Møller [4] and Mott [5] are destructive for the beam properties due to solid targets they use and cannot be operated simultaneously with the physics experiments. They can only be operated at low intensity (< 10 µA) and at low energy (< 5 MeV) respectively; therefore, the physics experiments have to assume that beam polarization remains constant when the intensity or the energy of the beam is several orders of magnitude higher.…”