hrs at small angles for e +/ e- pair for apex
DESCRIPTION
HRS at small angles for e +/ e- pair for APEX. Paul Brindza , Jefferson Lab. Septum magnets and radiation . APEX schematic. HRS view for PREX. Hall A RT Septum magnet. View downstream from the target Showing sieve slit. RT Septum as installed for PREX. Beam Line field shield for PREX. - PowerPoint PPT PresentationTRANSCRIPT
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HRS at small angles for e+/ e- pair for APEXPaul Brindza, Jefferson Lab
Septum magnets and radiation
APEXschematic
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HRS view for PREX
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Hall A RT Septum magnet
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View downstream from the targetShowing sieve slit
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RT Septum as installed for PREX
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Beam Line field shield for PREX
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PREX septa magnets 2010
Custom beam line for APEX June 2010
Magnetic field on beam line for e+e- configuration APEX Test Run
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RT Septum Modifications for APEX
•RT Septum in High field configuration ie. all three coil sets installed and parallel fields
•Improved beam line field shield for parallel field operation
•Use soft iron shield that is 2 cm thick on mid plane
•Field shield extends +/- 100 cm from RT septum center
•Preserve beam aperture 7.0 cm diameter
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RT septum model with coils spaced +/- 2 cm
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Model side view showing extended field shield
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Original PREX shield
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RT Septum with original length 1 cm thick shield
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Field on beam line for 2 cm thick long shield
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Saturation in the 2 cm shield at center
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Saturation in shield at yoke end and coil end
Edge of yoke End of coils
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Field in iron shield mid plane along “Z”
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Field details along beam line
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Integral BdL along gap center
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RT Septum across gap in magnet mid plane
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Cost and time impact of septum beam shield
• Iron shield needs to be 2 cm thick in mid plane and ~ 200 cm long. Current shield is length of yoke.
• RT septum will need coil spacers to fit the new coil spacing of +/- 1 cm.
• RT septum must be disassembled to install new beam shield and change coil spacing.
• Cost is about $20,000 plus at least two weeks for several Hall A techs.
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APEX Beam Shield Cost
•Iron 350 # annealed $ 3500•Boring 80 hr at 50$/hr $ 4000•Bellows and flanges $ 4000 •Welding & leak checking $ 2000•Use $20,000 for new shield
components plus Hall A labor
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Latest radiation budget
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Conclusions•RT Septum meets requirements for
APEX•APEX requires use of all three coils
sets (same as G2P) in parallel field mode
•RT Septum requires 2 DC supplies for high field 240 V 1100 A each
•Requires a thicker and longer beam field shield
•Modifications have reasonable cost and time impact