Difference between revisions of "Solid Magnet"

Revision as of 15:45, 17 March 2011

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Genearal

Integral to the SoLID spectrometer design is a large solenoid. Several existing solenoids are under consideration by the collaboration. These include the magnets from Babar, Cleo, CDF and ZEUS

	Babar	CLEO	CDF	ZEUS
Cryostat Inner Radius	150 cm	150 cm	150 cm	86 cm
Length	345 cm	350 cm	500 cm	245 cm
Central Field	1.49 T	1.5 T	1.47 T	1.8 T
Compact Flux Return	Yes	Yes	No	No
Current density variation	Up and Downstream ends (25%) of coil have 2x current of central 50%	Up and Downstream ends (25%) of coil have 1.04x current of central 50%	No	25% more current at ends
Magnet Map Update Date	7 Feb 2011		4 Feb 2011	4 Feb 2011
Poisson input deck	BABARv3.am		CDFv3.am	ZEUSv1.am
Poisson SF7 output on 1 cm grid	BABARv3.sf7		CDFv3.sf7	ZEUSv1.sf7
PDVIS target Location	z=0		z=+50	z=0
plot by Possion
plot by SF7toGEMCmap.C
Notes: (1) the center of the magnet is taken as the orgin. The target offset for the CDF magnet makes up for the fact that the magnet is longer than the Babar magnet. (2) The upstream pole pieces of the CDF and ZEUS magnets can be angles for SIDIS acceptance needs
Excel File to help make poisson input magnets.xlsx

talk and note

SoLID Magnet Options (and unstudied calorimeter thoughts)(Paul Reimer)

How to produce the filed map

• use program "Possion Superfish" from LANL http://laacg1.lanl.gov/laacg/services/download_sf.phtml or local copy [1]

It's a windows program and need installation, it can run with wine in linux or winXP, but not win7

see manuals for detailed help, especially for the postprocessor program SF7.EXE

• produce mesh by AUTOMESH.EXE with input from a ".am" file, output file will be ".T35" with only geometry and material
• then run POISSON.EXE with the ".T35" file which will be added with field.
• use WSFPLOT.EXE to view the ".T35" file
• then run SF7.EXE on the ".T35" file, do the field extrapolation for a line, arc or grid, the result is in a txt file "OUTSF7.TXT"
• a ".TBL" filed file may be produced also which can be directly viewed by TABLPLOT.EXE

Field map input files

all files are at svn "database_io/halla12/solid/field/"

• "babar_transv_3_4.am" BaBar_magnet from_Eugene with center of solenoid at 600cm
• "solenoid_BaBar.am" BaBar magnet files created by Zhiwen, based on Eugene's file but moved to the center of solenoid to origin
• "BABARv3.am" BaBar magnet by Paul
• "CDFv3.am" CDF magnet by Paul
• "ZUESv1.am" ZUES magnet by Paul

Field map output files

located at Solid website http://hallaweb.jlab.org/12GeV/SoLID/download/

• sf7 files are direct output from possion program
• dat files are conversion from sf7 to GEMC format

refer to Magnetic_Field_Map

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