Time-of-Flight Cheat Sheet

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TOF I

• WBS 1.5.2.3.1

• number of layers: 2
• horizontal and vertical orientation
• if no special modules, would be 42 counters per layer
• special modules take up 4 standard module spaces per layer
• two standard spaces: half-width modules
• two standard spaces: half-length modules
• dimensions (centimeters)
• standard: 2.54 x 6.00 x 252.00
• half-width: 2.54 x 3.00 x 252.00
• half-length (full-width): 2.54 x 6.00 x 120
• count per layer
• standard modules: 38
• half-width modules: 4
• half-length modules: 4
• totals (both layers)
• standard modules: 76
• half-width modules: 8
• half-length modules: 8
• sum of all modules: 92
• PMT's
• all modules have two PMT's except half-length modules which have one
• count is 2×(92-8) + 8 = 176
• high rate counters
• inner two standard counters on both sides, both layers = 8
• all of the half-width counters = 8
• all of the half-length counters = 8
• PMT count for these = 2×(8 + 8) + 8 = 40
• Standard PMT count would be 176 - 40 = 136

TOF II

• number of layers: 2
• horizontal and vertical orientation
• if no special modules, would be 42 counters per layer
• special modules take up 8 standard module spaces per layer
• two standard spaces: half-width modules
• three standard spaces: three-quarter-width modules
• three standard spaces: half-length modules
• dimensions (centimeters)
• standard: 2.54 x 6.00 x 252.00
• three-quarter-width: 2.54 x 4.50 x 252.00
• half-width: 2.54 x 3.00 x 252.00
• half-length (three-quarter-width): 2.54 x 4.50 x 117.00
• count per layer
• standard modules: 34
• three-quarter-width modules: 4
• half-width modules: 4
• half-length modules: 8
• totals (both layers)
• standard modules: 68 (Δ = −8)
• three-quarter-width modules: 8 (Δ = +8)
• half-width modules: 8 (Δ = 0)
• half-length (full-width) modules: 0 (Δ = −8)
• half-length (three-quarter-width) modules: 16 (Δ = +16)
• sum of all modules: 100 (Δ = +8)
• PMT's
• all modules have two PMT's except half-length modules which have one
• count is 2×(100-16) + 16 = 184 (Δ = +8)