particles

Helium-3 ions Maximum energy (Mev) 730 460 910 1140 Energy spread (Mev) 55       Beam intensity         Average current (μa) 0.75 0.75 0.25   Peak current (μa) 120 120 40   Beam radius, maximum (in.) 82 82 82 82 Time required for acceleration (msec) 6 4.5 4.5   Number of revolutions during acceleration 75,000 60,000 60,000   Distance traveled during acceleration (miles) 450 360 360   Velocity at maximum energy (% of speed of light) 82 60 60 69 Mass increase at maximum energy (% of rest mass) 75 25 25 40 Range of full-energy particles (in. of aluminum) 37 12 7  

External Beams

	Physics cave			Meson cave
	Protons	Neutrons	π+	π+		π-
Energy (Mev)	730		310	100	250	100	300
Energy spread (Mev)	14			10	20	10	30
Beam area (cm2)	25		40	100	100	100	100
Flux (particles/cm2-sec)	2×1010	5×105	5×104	1000	100	1500	1000

Acceleration chamber (vacuum tank)

Size
length (ft)	25
width (ft)	20
height (ft)	4
Material: mild steel
Operating pressure (mm Hg)	10-5
Vacuum pumps: six 20-in. oil-diffusion pumps with 8-in. boosters: one Beach-Russ 750-cfm; one Kinney 300-cfm; two Kinney 105-cfm.
Pumping speed of oil-diffusion pumps (liters/sec)	20,000

Magnet

Core diameter (in.)	184
Pole-tip diameter (in.)	188.75
Pole gap at center (in.)	14
Magnetic field strength (gauss)
at center	23,400
at radius of 82.2 in., where n = 0.2	22,275
Weight of steel (tons)	4,000

Magnet coils	Main coils	Auxiliary coils
material	solid copper (1/4 × 4 in.)	hollow copper (1-3/16 × 1-1/16 in.)
weight of copper (tons)	300	40
number of turns (total)	2,600	425
ampere turns	1.9 × 106	1.1 × 106
current (amp)	1600	2800
voltage (v)	550	560
power (kw)	900	1600
coolant	oil	water

Radiofrequency system

Dee system

number of dees	1
size
length (in.)	126
width (in.)	180
height (in.)	48
material: 1/64-in.-thick copper, stretched over a stainless steel frame
dee aperture (in.)	4-3/16

Oscillator

type: self-excited grounded-grid	10
tube: one Machlett ML5681
dc input, operating condition (kw)	10
dee bias, maximum dc (v)	2000

	Protons	Deuterons	Alpha particles
rf duty cycle (%)	38	28	28
dee-to-ground voltage, peak (kv)	9	6	6

Frequency-modulation system

type: vibrating-reed (tuning-fork) capacitor

number of units: two (two blades each)

blades
size
width (in.)	45
length (in.)	32
thickness: tapered from 1.4 to 0.06 in.
weight (lb)	500
vibrational frequency (cps)	64
electrical capacitance (μμf)	300 to 6,500
peak-to-peak excursion (in.)	1
minimum separation of blade and