Eugene,
It was a Sentron type 3M12-2-2 that I bought from GMW. Go to the GMW
web site and look at the 2.0 T 3d unit.
Ernie
Ernie Ihloff, P.E.
Engineering Group Leader- EE
MIT Bates Research & Engineering Center
Office 617-253-9503
Cell 781-760-9381
eihloff@mit.edu
On Jul 30, 2006, at 4:42 PM, Eugene J. Geis wrote:
> 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. | |
>> | - - - - - - - - - - - - | - - - - - - - - -|
>> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
>> | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
>> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
>> | 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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