These are the dimensions used for the new target subsystem. I list various data and sources and the ones finally used. Items in [] are from Kelvin, and the ones with * were scaled by him from a TRIUMF drawing.

param definition values

ZDGSTG(1) length of BeO TN237: 15 or 16 X .975"; Kelvin: 15" PK: meas .975" [15x0.982"]: 1992,1994 runs, BeO thickness =15x14.73 cm =37.41 cm varies and not exactly flat. USE 37.41 CM

ZDGSTG(2) gap between BeO TN237: I calc 0.4 cm; Kelvin doesn't recall a gap and PbGl *[1/16"] = .159 cm Akira: black plastic light shield ~.3-.4 cm Takashi: 0 (sure) USE 0.3 CM -- AND MAKE IT PLASTIC

ZDGSTG(3) length of PbGl TN237: 10 cm; Kelvin: 4"=10.16 cm [4"] Akira: 10 cm as ordered from company USE 10.0 CM

ZDGSTG(4) gap between PbGl TN237: I calc .33 cm and B4 *[0.04"] = .102 cm Takashi: .33 cm about right USE 0.33 CM

ZGAPTG gap between B4 TN237: 0.0 cm; Kelvin: a little less than 1/4" and ends of IC *[1/8"] = .3175 cm USE 0.3 CM ????????????

RDGTG radius of PbGl TN237: 5.6 cm; Kelvin 4.212"=5.35 cm (also used for B4 and degr) [4.212"] = 10.7 cm/2=5.35 cm Akira: 10.7 cm, lightguide fm 10.8 to 12.9 cm part of lightguide is leadglass, part lucite PK: "radius" of B4: match TG, diam=12 cm Takashi: 5.35 cm. Is 5.6 cm at front USE 5.35 CM

ZXYHOD thickness of each TN237: .635 cm B4 plane [1/4"] PK: .25" = .635 cm USE 0.635 CM

WTAR RADIUS of target DWG: 5.95 cm; SQGEOM: 5.98 cm (IR of IC): close (=inner rad of IC) enough [2.375"] = 6.0325 cm USE 5.98 CM

WIHEXO Outer radius of IC SQGEOM: 6.683 cm. This makes IC .277" thick. (=inner rad of VC) Is this correct? [2.625"] 6.6675 cm USE 6.615 CM = 5.98 + .25"

RADOUT Outer radius of VC DWG: 7.06 cm; SQGEOM: 7.26 cm [2.842"] = 7.219 cm USE 7.091 CM = 6.615 + 3/16"

ZICTR Length of IC (which DWG: 25.37 cm = 9.99"; Jim: <9.5" everyone seems to agree are centered on z=0) [9.55"] = 24.257 cm USE 24.257 CM

ZSVETO z of start of VC DWG: 11.445 cm [4.5"] = 11.43 cm USE 11.43 CM

ZICOH overhang of IC beyond DWG = Kelvin = .25" = .635 cm end of target. USE 0.635 CM

DFIB size of main fiber DWG: .492 SQGEOM: scint+clad+wrap=.488, rest air USE 0.492 CM (no good way to treat air)

-- thickness of IC [1/4"] = .635 cm -- thickness of VC [3/16"] = .476 cm