Solid Magnet
Contents
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
| 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 | 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 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
