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Rotary transformers for operation in high vacuum
Classified
abstracts
389-402 22 : 27
389. Some
data on mass-spectrometrical investigation of work mechanism of a halogen leak detector. (USSR) VI Karpov et al, Zh Tekh Fiz, 35 (9)) 1965,1662-1665, (in Russian). 22 : 24 390. Pressure bursts in bakeable ultrahigh vacuum valves during (USA) opening and closing.
The pressure increase produced by opening and closing bakeable ultrahigh-vacuum valves has been determined using mass spectrometric and other techniques. Two types of bellow sealed valves were tested: valves closed by a Conflat seal on a copper or silver gasket, and valves closed by a thin sheet of copper between a knife edge and a flat surface. The results of the investigation show that the pressure burst depends on the design and construction of the valve. The initial valve operation, following bakeout, shows an unusually large pressure burst, but subsequent operation gives very reproducible results for the gaskets as well as for the bellows. The gasket closing burst (3 x 10m9-8 >: lo-” torr) is less than the gasket opening burst (1 x 1O-8-3 x IO-” torr). The integrated effect of the bellows (5 x 1O-9-2 x IO-* torr) is of the same order of magnitude as that of the gasket closing and opening. The predominant gas evolved in the tested valves was hydrogen. Experiments at various system pressures indicate no particular dependence upon pressure for. the gasket closing and opening, but the bellows seem to be more pressure dependent. The effect which was determined is attributed to the cleavage and flow of the gasket material and to surface effects during the motion of the bellows. (Authors) R G Buser and J J Sullivan, Rep TR-ECOM-2638, US Army Electronics
Command,
Fort Monmouth,
NJ, Sept 1965.
391. Response of modified Redhead magnetron (USA) vacuum gauges aboard Explorer XVII.
22 : 34 and BayarSAlpert
The measurements of the density, pressure and temperature of the earth’s upper atmosphere are described. Two Redhead and two Bayard-Alpert gauges were used for this purpose in the satellite Explorer XVII. Gauge pressures from IO-* to lO-‘O torr were measured over the altitude range from 260 to 900 km. The gauges recorded during the spin period of 0.67 set pressure changes in the range from 3 x 10m9to 8 < 1O-8 torr. The independent gauge outputs yielded values in good agreement with kinetic theory piedictions. (Author) G P Newton, et al Rep AiASA-TN-D-214611964, Goddorrl Space Night
Center,
Greenbelt,
Md. 22
392. Gauge calibration
study in extreme high vacuum.
(USA)
Gauges were investigated for their performance at pressures below 1O~l’ torr. The gauges tested were: a normal magnetron gauge, an inverted magnetron, a nude modulated ion gauge and a suppressor grid gauge. The gauges were tested down to 3 >: lo-l3 torr, by using an advanced method of calibration. Possible variations in the output signal of an ion gauge according to the angle at which the beam of gas entered the grid structure were investigated. The sensitivity of the nude ion gauge did not appear to be directionally dependent. The rate at which an ion gauge would respond to rapid changes in gas density was also investigated. The response time was found to be 2.6 microseconds, a time comparable to that required for an ion to travel from the point of ionization within the grid structure to the collector. Thus in most practical cases the response time of an ion gauge would be determined by the rate of travel of the gas to the gauge. (Author) F Feakes et 4, Rep NASA-CR-167, National Res Carp, Cambridge, Mass,
F Bernhard 1965,31-37.
and H Hoffmann.
ExDt Tech Phvsik
I
,
1
I Jenal . 13 (1). _.
..-
22 396. A low-inertia
(USSR)
manganin pressure gauge.
A manganin pressure gauge for measuring and recircling pressures generated during the adiabatic compression of gases in a compression cycle lasting l-10 msec is described. D S Tsiklis and M D Borodina, Pribory (in Russian). 397. Characteristics, artificial ometers. (Czechoslovakia)
i Tekh Eksper,
2,196s.
ageing and quality of nitrogen
Study of the problem of artificial ageing of pressure-gauge B Han&k, Czech).
Jemnd
Mechanika
a Optika,
IO,
1965,
200, 22 therm-
systems.
209-214,
(in 22
398. Voltage I Japan)
dependence
of Bayard-Alpert
gauge
characteristics.
The dependence of the pumping speed and sensitivity of a BayardAlpert gauge on the electrode potential has been measured for He, Ar, Kr, at pressures of about lo-’ torr. For Ar and Kr it has been found that the pumping speed can be reduced with relatively small decrease in the sensitivity by lowering the electrode potential, though the accompanied decrease in the sensitivity is not small for He. The ionic pumping speed at the ion collector has been estimated to be about 2-3 orders of magnitude lower than the ionic pumping speed. K Ishikawa, Jap JApplPhys. 4 (6), 1965,461-465. 23. Plumbing 23 399. Rotary transformers
for operation
in high vacuum.
(USA)
A theoretical and experimental investigation of the feasibility of the rotary transformer to transmit power across a moving interface in high vacuum is presented. Since ordinary radiation is not sufficient to cool the transformer for higher power units, liquid nitrogen cooling was investigated and found to be technically feasible. The correlation between the major variables. the thermal radiation and temperature is shown on nomographs. Preliminary design criteria are discussed for a rotary transformer which can transmit power to a gimbal-mounted test vehicle in a space chamber at pressures of (Author) 10m5torr and lower. M K Kingery, Rep AEDC-TR-65-82, AD-464017, Center, Arnold Air Force Station, Term, May 1965.
Arnold
Eng Dev 23
400. Hard glass to stainless
steel sealing.
(Germany)
A method of making hard glass to stainless steel sealings is described. The technique used comprises a combination of Housekeeper seals with differential cooling, Some formulas and experimental results are given. The sealing of hard glass to stainless steel is shown to have the following advantages: the seal is non-magnetic and corrosion proof, has high mechanical strength and is vacuum-tight at high temperatures. (Czechoslovakia) V VokBlek, German).
Vakuum-Technik,
14
(8),
Dee
1965,
217-220, 23
401. Sliding electrical
contacts for ultrahigh vacuum.
(in
: 31
(USA)
the high vacuum in an MI-1305
A new sliding contact material has been developed for use in ultrahigh vacuum. F J Clauss, Rev Scient Instrum, 36 (8)) 1965, 1251-1252.
Pribory
402. Fibre optic vacuum window.
Feb 1965. 22
393. A simple method of improving mass spectrometer. (USSR) Yu I Selyaninov and K V Khomich, 174-l 75, (in Russian)
sensitivity (lo-l1 torr/l set) and high resolving ability (M/AM N 80 based on average half-width values) and is suitable for use as a leak detector in semiconductor and vacuum technology, and also as residual gas analyzer in high-vacuum processes.
: 33
23 i Tekh Eksper,
2, 1964,
22 33: 394. A controlled-pressure replicate-tube technique. (Great Britain) G D Anagnostopoulos and M Woodbine, Chet?z and Id, 42, 1965, 1761. 22 : 21 395. A small mass spectrometer as a sensitive leak detector and (East Germany) residual gas analyzer.
The construction, operation, performance and applications of a small size sensitive mass spectrometer is described. It has a high
: 42
A fibre optic window suitable for vacuum operations as high as lo-lo torr is now supplied by Materials Research Corp, Orangeburg, New York. Anon, Rev Scient Zmtrro,l,
36, Ott 1965, 1527.
24. Valves 24 : 22 Pressure bursts in bakeable ultrahigh-vacuum and closing. See abstract number 390.
valves during opening
153
abstracts
389-402 22 : 27
389. Some
data on mass-spectrometrical investigation of work mechanism of a halogen leak detector. (USSR) VI Karpov et al, Zh Tekh Fiz, 35 (9)) 1965,1662-1665, (in Russian). 22 : 24 390. Pressure bursts in bakeable ultrahigh vacuum valves during (USA) opening and closing.
The pressure increase produced by opening and closing bakeable ultrahigh-vacuum valves has been determined using mass spectrometric and other techniques. Two types of bellow sealed valves were tested: valves closed by a Conflat seal on a copper or silver gasket, and valves closed by a thin sheet of copper between a knife edge and a flat surface. The results of the investigation show that the pressure burst depends on the design and construction of the valve. The initial valve operation, following bakeout, shows an unusually large pressure burst, but subsequent operation gives very reproducible results for the gaskets as well as for the bellows. The gasket closing burst (3 x 10m9-8 >: lo-” torr) is less than the gasket opening burst (1 x 1O-8-3 x IO-” torr). The integrated effect of the bellows (5 x 1O-9-2 x IO-* torr) is of the same order of magnitude as that of the gasket closing and opening. The predominant gas evolved in the tested valves was hydrogen. Experiments at various system pressures indicate no particular dependence upon pressure for. the gasket closing and opening, but the bellows seem to be more pressure dependent. The effect which was determined is attributed to the cleavage and flow of the gasket material and to surface effects during the motion of the bellows. (Authors) R G Buser and J J Sullivan, Rep TR-ECOM-2638, US Army Electronics
Command,
Fort Monmouth,
NJ, Sept 1965.
391. Response of modified Redhead magnetron (USA) vacuum gauges aboard Explorer XVII.
22 : 34 and BayarSAlpert
The measurements of the density, pressure and temperature of the earth’s upper atmosphere are described. Two Redhead and two Bayard-Alpert gauges were used for this purpose in the satellite Explorer XVII. Gauge pressures from IO-* to lO-‘O torr were measured over the altitude range from 260 to 900 km. The gauges recorded during the spin period of 0.67 set pressure changes in the range from 3 x 10m9to 8 < 1O-8 torr. The independent gauge outputs yielded values in good agreement with kinetic theory piedictions. (Author) G P Newton, et al Rep AiASA-TN-D-214611964, Goddorrl Space Night
Center,
Greenbelt,
Md. 22
392. Gauge calibration
study in extreme high vacuum.
(USA)
Gauges were investigated for their performance at pressures below 1O~l’ torr. The gauges tested were: a normal magnetron gauge, an inverted magnetron, a nude modulated ion gauge and a suppressor grid gauge. The gauges were tested down to 3 >: lo-l3 torr, by using an advanced method of calibration. Possible variations in the output signal of an ion gauge according to the angle at which the beam of gas entered the grid structure were investigated. The sensitivity of the nude ion gauge did not appear to be directionally dependent. The rate at which an ion gauge would respond to rapid changes in gas density was also investigated. The response time was found to be 2.6 microseconds, a time comparable to that required for an ion to travel from the point of ionization within the grid structure to the collector. Thus in most practical cases the response time of an ion gauge would be determined by the rate of travel of the gas to the gauge. (Author) F Feakes et 4, Rep NASA-CR-167, National Res Carp, Cambridge, Mass,
F Bernhard 1965,31-37.
and H Hoffmann.
ExDt Tech Phvsik
I
,
1
I Jenal . 13 (1). _.
..-
22 396. A low-inertia
(USSR)
manganin pressure gauge.
A manganin pressure gauge for measuring and recircling pressures generated during the adiabatic compression of gases in a compression cycle lasting l-10 msec is described. D S Tsiklis and M D Borodina, Pribory (in Russian). 397. Characteristics, artificial ometers. (Czechoslovakia)
i Tekh Eksper,
2,196s.
ageing and quality of nitrogen
Study of the problem of artificial ageing of pressure-gauge B Han&k, Czech).
Jemnd
Mechanika
a Optika,
IO,
1965,
200, 22 therm-
systems.
209-214,
(in 22
398. Voltage I Japan)
dependence
of Bayard-Alpert
gauge
characteristics.
The dependence of the pumping speed and sensitivity of a BayardAlpert gauge on the electrode potential has been measured for He, Ar, Kr, at pressures of about lo-’ torr. For Ar and Kr it has been found that the pumping speed can be reduced with relatively small decrease in the sensitivity by lowering the electrode potential, though the accompanied decrease in the sensitivity is not small for He. The ionic pumping speed at the ion collector has been estimated to be about 2-3 orders of magnitude lower than the ionic pumping speed. K Ishikawa, Jap JApplPhys. 4 (6), 1965,461-465. 23. Plumbing 23 399. Rotary transformers
for operation
in high vacuum.
(USA)
A theoretical and experimental investigation of the feasibility of the rotary transformer to transmit power across a moving interface in high vacuum is presented. Since ordinary radiation is not sufficient to cool the transformer for higher power units, liquid nitrogen cooling was investigated and found to be technically feasible. The correlation between the major variables. the thermal radiation and temperature is shown on nomographs. Preliminary design criteria are discussed for a rotary transformer which can transmit power to a gimbal-mounted test vehicle in a space chamber at pressures of (Author) 10m5torr and lower. M K Kingery, Rep AEDC-TR-65-82, AD-464017, Center, Arnold Air Force Station, Term, May 1965.
Arnold
Eng Dev 23
400. Hard glass to stainless
steel sealing.
(Germany)
A method of making hard glass to stainless steel sealings is described. The technique used comprises a combination of Housekeeper seals with differential cooling, Some formulas and experimental results are given. The sealing of hard glass to stainless steel is shown to have the following advantages: the seal is non-magnetic and corrosion proof, has high mechanical strength and is vacuum-tight at high temperatures. (Czechoslovakia) V VokBlek, German).
Vakuum-Technik,
14
(8),
Dee
1965,
217-220, 23
401. Sliding electrical
contacts for ultrahigh vacuum.
(in
: 31
(USA)
the high vacuum in an MI-1305
A new sliding contact material has been developed for use in ultrahigh vacuum. F J Clauss, Rev Scient Instrum, 36 (8)) 1965, 1251-1252.
Pribory
402. Fibre optic vacuum window.
Feb 1965. 22
393. A simple method of improving mass spectrometer. (USSR) Yu I Selyaninov and K V Khomich, 174-l 75, (in Russian)
sensitivity (lo-l1 torr/l set) and high resolving ability (M/AM N 80 based on average half-width values) and is suitable for use as a leak detector in semiconductor and vacuum technology, and also as residual gas analyzer in high-vacuum processes.
: 33
23 i Tekh Eksper,
2, 1964,
22 33: 394. A controlled-pressure replicate-tube technique. (Great Britain) G D Anagnostopoulos and M Woodbine, Chet?z and Id, 42, 1965, 1761. 22 : 21 395. A small mass spectrometer as a sensitive leak detector and (East Germany) residual gas analyzer.
The construction, operation, performance and applications of a small size sensitive mass spectrometer is described. It has a high
: 42
A fibre optic window suitable for vacuum operations as high as lo-lo torr is now supplied by Materials Research Corp, Orangeburg, New York. Anon, Rev Scient Zmtrro,l,
36, Ott 1965, 1527.
24. Valves 24 : 22 Pressure bursts in bakeable ultrahigh-vacuum and closing. See abstract number 390.
valves during opening
153