Difference between revisions of "Solid Magnet"

Revision as of 12:41, 2 April 2012

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General

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

After consideration of the details and availabilities of various coils, the CLEO solenoid was chosen. The NIM article on CLEO can be found at CLEO NIM

• CLEO Manual and pictures here

	Babar	CLEO	CDF	ZEUS	Custom
Cryostat Inner Radius	150 cm	150 cm	150 cm	86 cm	100 cm
Length	345 cm	350 cm	500 cm	245 cm	230 cm
Central Field	1.49 T	1.5 T	1.47 T	1.8 T	2.68 T
Compact Flux Return	Yes	Yes	No	No	Custom
Current density variation (current/length)	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	50% more current at ends
Magnet Map Update Date	2011/4/6	2011/8/26	2011/4/6	2011/2/4	2011/6/21
Poisson input deck	BABARv4.am	CLEOv5Wedge.am	CDFv4.am	ZEUSv1.am	SolCustv1.am
Poisson SF7 output	BABARv4.sf7	CLEOv5Wedge.sf7	CDFv4.sf7	ZEUSv1.sf7	SolCustv1.sf7
grid info	grid size: 1cm, Rmin 0 Zmin -400, Rmax 400 Zmax 600, R and Z increments: 400 1000	grid size: 1cm, Rmin 0 Zmin -400, Rmax 400 Zmax 600, R and Z increments: 400 1000	grid size: 1cm, Rmin 0 Zmin -400, Rmax 400 Zmax 600, R and Z increments: 400 1000	grid size: 1cm, Rmin 0 Zmin -300, Rmax 300 Zmax 475, R and Z increments: 300 775	grid size: 1cm, Rmin 0 Zmin -400, Rmax 400 Zmax 600, R and Z increments: 400 1000
PDVIS target "designed" Location	z=0	z=0	z=+50	z=0	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 older magnets.xlsx

version history

CLEOv5: The CLEO yoke has been updated with more shielding at front end cup for fringe field and tweak end cup with a triangle piece to minimize fields in end cup.

Field Integrals for Baffles

Field integrals for the various magnets are shown above. The different colored points are for different scattering angles spanning the acceptance. The spacing between baffles for all magnets is 30cm, except for Zeus, which is 20.6cm.

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/solid/field/"

• "babar_transv_3_4.am" BaBar_magnet from_Eugene with center of solenoid at 600cm
• "BaBar_zwzhao.am" BaBar magnet files created by Zhiwen, based on Eugene's file but moved to the center of solenoid to origin
• "BABARv*.am" BaBar magnet by Paul
• "CLEOv*.am" CLEO magnet by Paul
• "CDFv*.am" CDF magnet by Paul
• "ZEUSv*.am" ZEUS magnet by Paul

Field map output files

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

• 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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