Diamond Detectors for Compton Polarimetry

Martin, J. W.; Dutta, D.; Narayan, A.; Wang, P.
December 2009
AIP Conference Proceedings;12/17/2009, Vol. 1182 Issue 1, p623
Academic Journal
Parity-violating electron scattering experiments aim to test the standard model of particle physics through precise low-energy determinations of the weak mixing angle. These experiments require determination of the polarization of the incident electron beam to the 1% level or better. An example of this type of experiment is the Q-weak experiment, which will be conducted in Hall C at Jefferson Lab in 2010 and beyond. We are constructing a Compton polarimeter in Hall C to provide continuous monitoring of the polarization with the goal of 1% absolute polarization determination. In our Compton polarimeter, circularly polarized laser light will impinge upon the electron beam. Electrons scattered by the Compton process will be momentum-analyzed in a dipole magnet downstream of the interaction point. A diamond strip tracker will be placed further downstream of the dipole to sense the Compton-scattered electrons and determine their momenta. The design of the polarimeter, focusing on electron detection, and our progress in prototyping and constructing the diamond strip tracker, are discussed.


Related Articles

  • High Brightness and High Polarization Electron Source for Spin-LEEM. Nakanishi, T.; Yamamoto, N.; Mano, A.; Nakagawa, Y.; Konomi, T.; Yamamoto, M.; Okumi, S.; Jin, X.; Ujihara, T.; Takeda, Y.; Ohshima, T.; Kohashi, T.; Yasue, T.; Koshikawa, T.; Saka, T.; Kato, T. // AIP Conference Proceedings;8/4/2009, Vol. 1149 Issue 1, p1148 

    A point-like emission mechanism is required for a GaAs polarized electron source to produce an electron beam with high brightness. This is realized by changing the direction of injection laser from a front-side to a back-side of the photocathode. Based on this concept, a 20 keV gun (JPES-1) was...

  • Ultra Cold Photoelectron Beams for Ion Storage Rings. Orlov, D. A.; Krantz, C.; Shornikov, A.; Lestinsky, M.; Hoffmann, J.; Jaroshevich, A. S.; Kosolobov, S. N.; Terekhov, A. S.; Wolf, A. // AIP Conference Proceedings;8/4/2009, Vol. 1149 Issue 1, p1007 

    An ultra cold electron target with a cryogenic GaAs photocathode source, developed for the Heidelberg TSR, delivers electron currents up to a few mA with typical kinetic energies of few keV and provides unprecedented energy resolution below 1 meV for electron-ion recombination merged-beam...

  • A Real-Time Circular-Polarization Monitor For Magnetic Compton-Scattering Beamline. Kawata, H.; Adachi, H.; Matsumoto, I.; Warwick, T. // AIP Conference Proceedings;2004, Vol. 705 Issue 1, p549 

    A transmission-type circular polarimeter has been developed for the magnetic Compton-scattering experiment. With this device, it is possible to non-destructively monitor the approximate value of the degree of circular polarization of incident x rays during an experiment at intervals of, e.g., a...

  • A new approach to parton-density evolution. Goshtasbpour, Mehrdad; Ratcliffe, Philip G. // AIP Conference Proceedings;2001, Vol. 570 Issue 1, p879 

    Polarized p-p collisions at RHIC with 50<√s<500 GeV will provide us new information on the spin structure of the nucleon. Using the PHENIX detector, we plan to measure the double-longitudinal spin asymmetry (A[sub LL]) for the heavy-flavor production which is sensitive to the gluon...

  • Electron beam polarization with the Compton polarimeter at JLab. Pussieux, T. // AIP Conference Proceedings;2001, Vol. 570 Issue 1, p761 

    We built and operated a new kind of Compton polarimeter to measure the electron beam polarization of the Thomas Jefferson National Accelerator Facility (Virginia, USA) to 3% total error within an hour. The heart of this polarimeter is the coupling of a High Finesse monolithic Fabry-Pérot...

  • Spin polarizabilities of the nucleon from polarized low-energy Compton scattering. Hildebrandt, R. P.; Grieβhammer, H. W.; Hemmert, T. R. // European Physical Journal A -- Hadrons & Nuclei;May2004, Vol. 20 Issue 2, p329 

    As a guideline for forthcoming experiments, we present predictions from Chiral Effective Field Theory for polarized cross-sections in low-energy Compton scattering for photon energies below 170 MeV, both on the proton and on the neutron. Special interest is put on the role of the nucleon spin...

  • Scalar-meson production in nucleon-nucleon collisions near threshold. Rekalo, M. P.; Tomasi-Gustafsson, E. // European Physical Journal A -- Hadrons & Nuclei;Dec2003, Vol. 18 Issue 4, p697 

    We establish the model-independent spin structure of the matrix elements for the near-threshold scalar-meson production in pp and np collisions, when the final particles are emitted in S-state. Polarization phenomena are derived in a general form. The properties of the t-channel dynamics, which...

  • Covariant Methods for Calculating Differential Cross Sections and Polarization Characteristics of Reactions. Sikach, S. M. // Physics of Atomic Nuclei;Jun2005, Vol. 68 Issue 6, p1064 

    A covariant method for calculating reaction amplitudes in the diagonal spin basis is presented. In this basis, amplitudes represent the spin kinematics of the interacting particles in the simplest and most adequate manner. A matrix is obtained such that differential cross sections for polarized...

  • Study of X-ray Harmonics of the Polarized Inverse Compton Scattering Experiment at UCLA. Doyuran, A.; England, J.; Joshi, C.; Musumeci, P.; Rosenzweig, J.; Tochitsky, S.; Travish, G.; Williams, O. // AIP Conference Proceedings;2004, Vol. 737 Issue 1, p750 

    We propose an Inverse Compton Scattering (ICS) experiment, which will investigate nonlinear properties of the scattering utilizing the terawatt CO2 laser system with various polarizations in Neptune Laboratory at UCLA. When the normalized amplitude of the vector potential a0 is larger than unity...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics