NEGs are ideal for pump down, stay down applications and can be used to boost the performance of an ion pump or as a standalone pump. They are ideal for UHV applications due to their compact size and high H2 pumping speed
High pumping speeds in a compact volume
Typical range base on the amount of material
without the need for power
to boost the performance of an ion pump
xxx
xxx
Pumping speed H2
Pumping speed CO
H2 sorption capacity
CO (25ºC) sorption capacity
CO Total sorption capacity
l/s
l/s
Torr l
Torr l
Torr l
N50
55
27
630
0.1
284
N100
106
51
1170
0.2
526
N200
208
94
2160
0.4
972
N300
312
125
2880
0.6
1296
N400
412
156
3600
0.8
1620
NEGs are reactive metals that have been pressed onto solid substrates or sintered into discs. The amount of material used controls the speed and capacity of the NEG pump, but typically ranges from 50 to 3,500 l/s of hydrogen. As NEGs become saturated with gases, they can be reactivated without venting to atmosphere. Their prime advantage is their ability to pump for extended periods without the need for power
NEGs are ideal for pump down, stay down applications and can be used to boost the performance of an ion pump or as a standalone pump. They are ideal for UHV applications due to their compact size and high H2 pumping speed. They are not suitable for applications that cycle up to atmospheric pressure regularly as this will saturate the surface and they can only be reactivated a finite number of times.
Product Features
LIQUID CRYOSHROUD
The liquid cryoshroud consists of a double walled, type 304L stainless steel cylinder with two liquid nitrogen feedthroughs (.375 in. diameter) with flare type fittings. It provides 1578 cm2 (245 in2 ) of liquid nitrogen cooled surface area that provides pumping speeds up to 12,000 ls-1 for hydrogen (see table). The shroud is mounted on an 8 in. CFF (DN160).
TSP FILAMENT CARTRIDGE
The filament cartridge is mounted on a 2- 3/4” CFF (DN40). The feedthrough supports three titanium-molybdenum filaments and a return path for ground isolation. Each filament contains 1.5 grams of usable titanium and averages 20 hours of operation.
AMBIENT SPUTTER SHIELD
The ambient sputter shield economically maximizes surface area when cooling is not practical or possible. It provides 827cm2 (128 in2 ) of ambient temperature surface area that provides pumping speeds up to 2200 ls-1 for hydrogen (see table). The shield is mounted on an 8 in. CFF (DN160) or a 6 in. CFF (DN100).
