[Halld-tagger] Analysis of tagger field map Configuration 2

[Timothy Whitlatch]

Hi Dan, 

We recalibrated the Hall probes yesterday. All except probe 4 look basically the same. 4 has changed by as much as 27 Gauss at 1.7T decreasing to no change at 500 Gauss. This may have been drifting during the past 10 days since the previous calibration. 
The good news is....I broke probe 4 and we are replacing it. 

We will recalibrate before each configuration in the future. 
Attached is the updated calibration sheet. 

We have changed the setup to configuration 6 and it will be fiducialized this afternoon. We should map config 6 Monday. 


Tim Whitlatch 
Hall D Engineer 
Jefferson Lab 
12050 Jefferson Ave ste 402 
Newport News, Va 23606 
757-269-5087 

----- Original Message -----

From: "Daniel Sober" <sober at cua.edu> 
To: "Timothy Whitlatch" <whitey at jlab.org> 
Cc: "Natalie Walford" <natalie at jlab.org>, "Alexander Somov" <somov at jlab.org>, "Giles Brown" <giles at jlab.org>, "Eugene Chudakov" <gen at jlab.org>, "Franz Klein" <KLEINF at cua.edu>, "Hall D beam working group" <halld-tagger at jlab.org> 
Sent: Thursday, January 16, 2014 7:42:15 PM 
Subject: Analysis of tagger field map Configuration 2 

Plots of the tagger dipole field maps for Configuration 2 at 1.7 T, 1.5 T and 0.75 T have been added to the web page: 
http:/faculty.cua.edu/sober/HallD/mapping 


Everything looks good at the level of a few gauss. There is an interesting small structure in the fringe field plotted vs Y with a period of about 70 cm. Any ideas what it might be due to? (coil clamps?, mapping frame?) In any case, it is too small to be worrisome. 

Dan 
-- 
Daniel Sober 
Professor 
Physics Department 
The Catholic University of America 
Washington, DC 20064 
Phone: (202) 319-5856, -5315 
E-mail: sober at cua.edu 

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