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COMPTON POLARIMETER

PRELIMINARY MAGNET DESIGN

06/03/08 Christopher Vidal, Senior Mechanical DesignerErnie Ihloff , P.E., Engineering Group Leader EE

Jan Van Der Laan, PHD. PHYS.

Massachusetts Institute of TechnologyLaboratory for Nuclear Science

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PRELIMINARY LAYOUT

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LAYOUT DETAIL

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MAGNET ASSEMBLY

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MAGNET DESIGN

SPEFICATIONSOVERALL LENGTH----------------------------------------------------141.64 CM (55.76 IN)EFFECTIVE LENGTH------------------------------------------------- 125.00 CM (49.21 IN)STEEL LENGTH-------------------------------------------------------- 121.48 CM (47.82 IN) OVERALL HEIGHT------------------------------------------------------ 60.34 CM (23.76 IN)STEEL HEIGHT-----------------------------------------------------------45.72 CM (18.00 IN)OVERALL WIDTH-------------------------------------------------------- 62.23 CM (24.50 IN)STEEL WIDTH-------------------------------------------------------------62.23 CM (24.50 IN)WEIGHT------------------------------------------------------------1294.75 KG (2854.44 LBS)POLE GAP---------------------------------------------------------------------3.00 CM (1.18 IN)TURNS PER COIL-------------------------------------------------------------------------------64FIELD STRENGTH-------------------------------------5.58 KG @ 1.165 GeV, 10.3 Deg. 12.14 KG @11.023 GeV, 2.4 Deg.

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12 kG Transverse profile

0.0

2.0

4.0

6.0

8.0

10.0

12.0

-150 -100 -50 0 50 100 150x [mm]

By

[kG

]

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12 kG Transverse

-4.0E-04

-2.0E-04

0.0E+00

2.0E-04

-50 -40 -30 -20 -10 0 10 20 30 40 50

x [mm]

DB

y/B

y

No Shim

Shim added

Optimized shim

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Longitudinal

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2.5

5.0

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-250 0 250 500x [mm]

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[kG

]

5.58 kG

12.14 kG

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(0)eff yy

L B dlB

Leff ( 5.58 kG) = L + 17.58 mm

Leff (12.14 kG) = L + 17.52 mm

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SAMPLE DETAIL DRAWINGS

1: Detail drawings for the magnets have been sent to “New England Techni-Coil Inc.” In Wolfboro NH. A cost quote and lead time are pending.

2: Detail drawings for stands in process. Stands can be constructed at Bates.

3: Detail drawings for vacuum chambers in process. Chambers can be constructed at Bates.

4:Additional fabrication sources will be considered upon request.

DRAWING SHOWN IN PRESENTATION MAY NOT BE LASTEST REV. ASDESIGNS MAY STILL BE IN PROGRESS

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SUPPORT STANDS1: Welded tubular steel construction.2: Course height and level adjustments made via 4 leveling pads.3: Fine positional adjustment made via 6 struts mounted to a removable plate.4: Stands are designed to place center of magnet poles 57CM below beam height.5: Different heights will be addressed with pedestals of similar construction.

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VACUUM CHAMBER

Chamber is constructed from 304 stainless steel with internal welds, where possible,0r full penetration external welds where internal is not possible.The round flange uses a copper conflat gasket, and the rectangular flange uses anAll metal “VAT” seal.

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RECTANGULAR “VAT” SEAL

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VACUUM CHAMBER DEFLECTION

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REMAINING DETAILS

• Final design drawings for the stands and connecting vacuum chambers will be completed upon approval of the preliminary magnet design.

• Trim coil design in progress.• Strain relief for power and cooling connections needs to be

designed• Layout and designs could change pending a discussion regarding

magnet poles which are parallel to the beam or poles with equal entrance and exit angles.

• Secondary pole tips need to be detailed to machine drawings for 12kG configuration.