Does anyone know the manufacturer of the 3D Probe
used for the magnetic field measurements in the
target? I'd like to look at a few specs.
-eugene
Quoting Michael Kohl <kohlm@mit.edu>:
> Hi Eugene,
>
> here's my summary from May 30 including the two "nominal" angles to be
>
> used with Doug's averaged map.
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 30 May 2006 13:26:05 -0400 (EDT)
> From: Michael Kohl <kohlm@mit.edu>
> To: "[BLAST_ANAWARE]" <Blast_anaware@rocko.lns.mit.edu>
> Subject: Spin angle summary
>
> Hello:
>
> this is to summarize the final numbers for the target spin angle:
>
> We agreed to use the ed elastic tensor asymmetry to first determine the
> ed
> elastic yield-weighted average, and then deduce theta_nominal for the
> considered profile [theta_nominal = theta(z=0)].
>
> Doug's profile should be used. It is in cvs at
> exp/analysis/macros/target_spin_angle.C.
> It requires a global alignment given by "theta_nominal" which is the
> profile's value at z=0. While the same theta_nominal applies to all
> reaction analyses, each resulting yield-weighted average angle can
> vary individually. For use in DGen, I've added the 32 and 47 deg
> profiles
> with proper values for "theta_nominal" (see below) into kine.init just
> as a
> grid z:theta, uncomment the lines to activate. I've generated the lines
> in
> kine.init with the macro exp/analysis/macros/DPprofile_to_kineinit.C,
> find both
> in the latest cvs.
>
> Results:
> For the "32" degree setting, theta_nominal = 34.12 +- 0.43
> For the "47" degree setting, theta_nominal = 48.84 +- 0.45
> Chi recommends to generally quote an error of 0.5 degrees to be on
> "the conservative side and and to partially reflect the fact that
> there are conflicting results" [with ep elastic when it is used to
> determine the spin angle].
>
> In the table below, compare <th>_yield between "map" and "asym": it
> tells by how much a given map needs to be shifted to comply with the
> physics of tensor ed elastic. The error is given by the uncertainty
> with which the overall alignment can be determined from the ed elastic
> tensor asymmetry and is on the order of 0.5 degrees, while the error on
> the
> "shape" of the profile(s) is on the order of 0.1 deg or less and hence
>
> negligible.
>
> 32 degrees setting: ed elastic
> ==============================
> Ed-elastic yield-weighted average angle for original maps from survey:
> <th>_yield <dth>_yield theta_nominal(z=0) Comment
> 31.2(map) -2.89 34.09 original Jan2005 map
> 30.6(map) -2.75 33.35 original Jun2005 map
> "map" is the yield-weighted average angle for a given original map
> ----------------------------------------------------------------------
> Angle from tensor asymmetry analysis and resulting theta_nominal:
> <th>_yield <dth>_yield theta_nominal(z=0) Comment
> 31.3(asym) -2.89 34.19 shifted Jan2005 + 0.1
> -2.75 34.05 shifted Jun2005 + 0.7
> -2.82(av.) ->34.12 nominal angle for DH's profile
> 31.7(oldasym)
> "asym" is the yield-weighted average angle from asymmetry analysis
> (asym=v3_4_18, oldasym=online crunch version)
> ==> theta_nominal = 34.12 degrees
> Error on theta_nominal: statistical: 0.35
> tracking: 0.20
> false asym: 0.10
> theory: 0.10
> TOTAL: 0.43
>
===============================================================
=======
>
===============================================================
=======
>
> 47 degrees setting: ed elastic
> ==============================
> Ed-elastic yield-weighted average angle for original maps from survey:
> <th>_yield <dth>_yield theta_nominal(z=0)
> 47.0(map) -1.5 48.5 original Jul2004 map
> 46.7(map) -1.5 48.2 original Jan2005 map
> 46.2(map) -1.32 47.52 original Jun2005 map
> "map" is the yield-weighted average angle for a given original map
> ----------------------------------------------------------------------
> Angle from tensor asymmetry analysis and resulting theta_nominal:
> <th>_yield <dth>_yield theta_nominal(z=0)
> 47.4(asym) -1.5 48.9 shifted Jul2004 + 0.4
> -1.5 48.9 shifted Jan2005 + 0.7
> -1.32 48.72 shifted Jun2005 + 1.2
> -1.44(av.) ->48.84 nominal angle for DH's profile
> 47.8(oldasym)
> "asym" is the yield-weighted average angle from asymmetry analysis
> (asym=v3_4_19, oldasym=online crunch version)
> ==> theta_nominal = 48.84 degrees
> Error on theta_nominal: statistical: 0.45
> tracking: 0.12
> false asym: 0.01
> theory: 0.10
> TOTAL: 0.45
>
===============================================================
=======
>
===============================================================
=======
>
>
> Best regards,
>
> Michael
>
>
>
> +-------------------------------------+--------------------------+
> | Office: | Home: |
> |-------------------------------------|--------------------------|
> | Dr. Michael Kohl | Michael Kohl |
> | Laboratory for Nuclear Science | 5 Ibbetson Street |
> | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
> | Middleton, MA 01949 | U.S.A. |
> | U.S.A. | |
> | - - - - - - - - - - - - | - - - - - - - - -|
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> | http://blast.lns.mit.edu | |
> +-------------------------------------+--------------------------+
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
--------------------------------------------------------------------------
Eugene Geis
PhD Student, Physics Department, ASU
Research Affiliate, MIT-Bates Laboratory of Nuclear Science
eugene.geis@asu.edu
--------------------------------------------------------------------------
http://quickreaction.blogspot.com
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