DEA and CPV Geometry

The information presented here is based on converstions with J. Dowd and H. Willutzki. They have used prints and P.O.'s from Bicron to reconstruct this information. The "outer box" is that depicted in C.O.'s drawings. The drawing below shows the entire DEA/CPV package. Details on individual components follows.

DEA

DEA is constructed in four sections. Each section consists of 18 layers of scintillator and 18 layers of Pb. The dimensions of the scintillator are:
• Short (side) sections: 21" x 15" x 5 mm
• Long (top/bottom) sections: 53.84" x 15" x 5 mm

The scintillator is Bicron BC 408. We are assuming that the Pb sheets are of identical height and width. The Pb sheets come in two thicknesses:

• First 12 sheets: 0.073" thick (1/3 radiation length)
• Last 6 sheets: 0.146" thick (2/3 radiation length)

The Pb sheets contain 6% Sb (Antimony). The total thickness is 1.752" of Pb (8 radiation lengths) plus 3.54" of scintillator for a total thickness of 5.292". Each section of the DEA is enclosed in an aluminum box. The boxes have 0.25" thick top and bottom walls, and 0.5" thick front, back, and sides, and are slightly oversized. The outside dimensions of the boxes are:

• Short (side) sections: 22.070" x 15.5" x 6.5"
• Long (top/bottom) sections: 55.070" x 15.820" x 6.5"

this leads to inner dimensions of:

• Short (side) sections: 21.070" x 15.0" x 5.5"
• Long (top/bottom) sections: 54.070" x 15.320" x 5.5"

The sizes and locations of the sensitive areas of DEA are thus as follows (assuming that the center of the hole is at (x,y) = (0,0):

Component	Size			Location (upper left corner)
	width (x)	height (y)	thickness (z)	x	y
Top	53.84"	15"	5.292"	-26.92"	+23.00"
Bottom	53.84"	15"	5.292"	-26.92"	-8.00"
Left	21"	15.88"	5.292"	-34.45"	+7.44"
Right	21"	15.88"	5.292"	+13.44"	+7.44"

CPVB

CPVB consists of a single sheet of scintillator, 17" x 27.5" x 1 cm. It is assumed that CPVB is centered on the whole in DEA. Locating this hole at (x,y) = (0,0) yields CPVB's upper left hand corner at (8.5",-13.75")

CPVC

CPVC is constructed in four sections that roughly mirror those of DEA. The dimensions of the scintillator are:
• Short (side) sections: 21" x 15.938" x 1 cm
• Long (top/bottom) sections: 54" x 15" x 1 cm

Assuming that the inner edges of the left and right sides of CPVC are aligned 0.5" from the edges of the hole in DEA (i.e. aligned with DEA scintillator), and that these side pieces are centered on the hole, yields the following positions for the elements:

Component	Size			Location (upper left corner)
	width (x)	height (y)	thickness (z)	x	y
Top	54"	15"	1 cm	-27.00"	+22.969"
Bottom	54"	15"	1 cm	-27.00"	-7.969"
Left	21"	15.938"	1 cm	-36.50"	+7.969"
Right	21"	15.938"	1 cm	+13.50"	+7.969"