Latest revision as of 15:39, 7 December 2020

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magnet candidate

CLEO-II

• www CLEO wikipedia, CLEO detector, coil, cryo pic

• publication NIM CLEO II detector(local copy) and IEEE paper focusing the magnet system (local copy)

• photos, documents and drawings
  • Some direct links operation manual, all parts numbered 1,all parts numbered 2, coil collar

BaBar

• www BaBar wikipedia, BaBar detector, magnet(SLAC main),magnet(RAL mirror) magnet TDR

• publication NIM BaBar detector(local copy), NIM fringe field study, Nuc.Phy.B coil

• photos, documents and drawings,
  • some direct links field mapping, field simulation talk

talk and note

there are more talks at collaboration meeting page

study from 2016

Jay Benesch's note

https://solid.jlab.org/cgi-bin/private/ShowDocument?docid=2

study by 2012

• Zhiwen's update on base on Eugen's study. it leads to CLEOv8 pptx pdf

• Eugene's study of CLEO-II adaption for SoLID

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

SoLID magnet design

Comparing Magnet

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	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	2012/7/27	2011/4/6	2011/2/4	2011/6/21
Poisson input deck	BABARv4.am	CLEOv8.am CLEOv8.fce	CDFv4.am	ZEUSv1.am	SolCustv1.am
Poisson SF7 output	BABARv4.sf7	CLEOv8.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 -600, Rmax 500 Zmax 600, R and Z increments: 500 1200	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=+10	z=+10	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 older version

version history

CLEOv8 update with realistic CLEO-II design and same magnet for both PVDIS and SIDIS

CLEOv6_PVDIS and CLEOv6_SIDIS update with CLEO separated yoke

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.

BABARv4 has SIDIS endcap, PVDIS can fit but not optimized because the endcap nose doesn't extend long enough to the coil region.

Field Integrals for Baffles

Fields at fixed radius

Field integrals and ratios for the various magnets are shown above. The integrals assume a trajectory of 28° beginning at the center of the target. The efficiencies for the baffle designs scale with the field integral shown here.

Poisson Superfish Howto

How to produce the filed map

use program "Poisson Superfish" from LANL (home page), get it from  direct link or local copy      

• It's a windows program and need installation, it can run with wine in linux or winXP/win7
• see including manuals and examples for detailed help.
• We have been using v7.18, the latest v7.19 came out in 2013, but the change doesn't affect the program we are using, refer to changelog

Here is a quick summary of howto.

• input file ".am" is a text file with regions defined by ploycons.
• produce mesh by AUTOMESH.EXE with input from a ".am" file, output file will be ".T35" with only geometry and material
• use WSFPLOT.EXE to view the ".T35" file to verify the setup.
• then run POISSON.EXE with the ".T35" file which will be added with field.
• use WSFPLOT.EXE to view the ".T35" file with field
• then run SF7.EXE on the ".T35" file, do the field extrapolation for grid with desired ranges and steps, the result is in a txt file "OUTSF7.TXT" which includes a 2D field map.
• run SF7.EXE on the ".T35" file, do the field extrapolation for a line, arc or curve, besides "OUTSF7.TXT", a ".TBL" file is produced and can be directly viewed by TABLPLOT.EXE
• run FORCE.exe with input ".fce" which gives points in a region, the resulting "OUTFOR.TXT" gives the force on the region.

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
• "CLEOv*.am" CLEO magnet
• "CDFv*.am" CDF magnet
• "ZEUSv*.am" ZEUS magnet

Field map output files

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

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

refer to Magnetic_Field_Map

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