[g2p_ana] abstract to the GRC

[Jixie Zhang]

Hi,
  Attached is a revised version. Thanks so much to Vince for his quick feed
back.


On Thu, Aug 2, 2012 at 12:35 PM, Jixie Zhang <jixie at jlab.org> wrote:

> Hi,
>   I am going to submit my abstract to the GRC. I pasted the tex text
> here and also attached the pdf file.  I will send my poster a little bit
> later.
> Feel free to give comments. Thanks.
>
>
>
> The G2P (E08-027) and GEP (E08-007) was recently completed at Hall A
> Jefferson Lab.
>
> The goal of the G2P experiment was to study the spin-denpendent structure
> function $g_{2}$
>
> for the proton at resonance region with low momentum transfer ($0.02 <
> Q^{2} < 0.2 GeV^{2}$).
>
> The GEP experiement was to meausure the proton elastic form factor ratio
> at the same
>
> low $Q^{2}$ region. These 2 experiments shared the same dynamic nuclear
> polarized (DNP)
>
> NH3 target except the orientation of the superconducting helmoholtz
> magnetic. G2P required
>
> running the target magnetic field pointing to 90 degrees(pointing to
> horizontal left if looking downstream
>
> along the beam line) with 2.5 or 5.01 Tesla while GEP required that the
> target field stays at 6 degrees
>
> with 5.01 Tesla. Several beam energies ranged from 1.1 to 3.3 GeV have
> been used.
>
> G2P experiment are the first Hall A experiments that a transver target
> field is used. In order
>
> to compensate the vertical bending of the incident electron beam while
> travel through the target field,
>
> a magnetic chicane was placed upstream from the target and a local dump
> were newly built and placed
>
> at 79 cm downstream. In order to reach low $Q^{2}$, a pair of septum
> magnetics was placed at 157 cm
>
> downstream, which will bend the 5.65 degrees elelctron rays to 12.5
> degrees so that they can
>
> reach the High Resolution Spectrommeter of Hall A. A recoil proton
> detector, the 3rd arm, was also
>
> built to monitor the beam and target polalrization. A Gean4 Monte-Carlo
> program was
>
> developed for these two experiments to simulate the beam line, target and
> septum field, the local dump,
>
> the 3rd arm and HRS detector acceptance. These simulation results will be
> present.
>
>
> --
> Best Regards,
> Jixie Zhang
> Jefferson Lab - Hall A - A112,
> 757-269-5352
> _______________________________________________
>



-- 
Best Regards,
Jixie Zhang
Jefferson Lab - Hall A - A112,
757-269-5352
_______________________________________________
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