Contents
V
Introduction
vi
Personnel
Publications and Reports
viii
Research Projects
I.
Physical Electronics
A. Electron Emission Problems
1. Thermionic Emission from Sintered Cathode of Thoria
and Tungsten Mixture
2. Studies on Oxide-Coated Cathodes. Correlation of
Pulsed and D-C Emission and Decay of Pulsed Emission
3. Work Functions and Conductivity of Oxide-Coated
Cathodes
4. Thermionic Emission from Oxide-Coated Cathodes under
Retarding and Accelerating Fields
Determination of the Thermionic Emission Properties of
5.
Single Tungsten Crystals by a Photometric Method
B. Gas Discharges
Langmuir Probe Measurements in the Mercury trc
1.
Operating in the Transition Range between Low and
High Pressures
C. Experimental Techniques
1. Spectral Emissivity of Tungsten
Ionization Gauge
2.
1
1
1
2
2
2
3
3
3
4
4
6
7
II.
Microwave Gaseous Discharges
III.
Solid State Physics
A. Properties of Matter at Low Temperatures
1. Helium Liquefiers
2. Surface Impedance of Tin
3. Resistivity of Normal Conductors
4. Investigation of Second Sound in Liquid Helium II
5. Mechanical Excitation of Second Sound in Liquid Helium
6. Theory of Liquid Helium
B. Pronerties of Matter at Ultrasonic Frequencies
C. Phase Transitions
D. Ultrasonic Absorption in Liquids
13
13
13
13
15
16
27
27
28
28
29
IV.
Radio-Frequency Spectroscopy
A. Molecular-Beam Research
Nuclear Quadrupole Moments
1. Hyper-fine Structures a
of the Halogens, and Na
2. The Generation and Detection of a Beam of Aluminum
Atoms
3. The Third Molecular-Beam Apparatus
4. Theory of Nuclear Effects in Microwave Spectra
B.
Magnetic Nuclear Resonance
1.
Measurements of Nuclear Magnetic Moments
2.
Studies of Phase Transitions by Means of Magnetic
Nuclear Resonance Phenomena
3. Circuit Improvement
C. Paramagnetic and Ferromagnetic Resonance Absorption
D. Microwave Spectroscopy
30
30
V.
The Linear Accelerator Program
30
30
30
31
32
32
34
39
39
40
C~_II__
I^_^~_
CI_
_____~I _ I1_/__
__I
______I___1~^~n~---^.ll ..LII~_
-i-l^_ii-L^._T^--~-_LI_1^
VI.
VII.
II-I. .-_I._C-.-..I
LI-IXI11
----11
. I__...
.I_
~L~-ll
--I-_~III~I^(.
Magnetron Development
A. Ten Megawatt Magnetron
B. Ceramic Windows
C. Thoria Cathodes
1. Physical Research
2. Design
D. Mode Stability
E. Noise Generation in the Pre-oscillating Magnetron
F . Static Space-Charge in the Plane Magnetron and Cylindrical 1Magnetron
44
46
47
47
47
47
47
51
Traveling-Wave Tubes
A. Three-Cm Traveling-Wave Amplifier Tubes
B. Seven-CM Traveling-Wave Oscillator
53
53
54
52
VIII. Communications Research
A. Multipath Transmission
1. Speech and Music
2. Broadbanding of the Bradley Detector
3. Television
B. Microwave Modulation Techniques
C. Statistical Theory of Communication
Electronic Correlator
1. Autocorrelation Function:
2. Probability of Distributions
a. Random Noise
b. Instantaneous Amplitude Distributions of a
Continous Time Function in the Frequency Range
between 50 and 10,000 Cycles/sec
c. Amplitude and Conditional Probability Distributions of a Quantized Time Function
3. Optimum Prediction
4. Theory of Transmission of Information
5. Pulse Modulation Studies
6. Effects of Transit Angle on Shot Noise in Vacuum
Tubes
D. Transient Problems
1. Envelope Studies
2. Transient Theories
3. Theory of the Synthesis of Networks for a Specific
Transient Response
4. Response of Networks to Frequency Transients
E. Active Networks
1. General Theory
2. Broadbanding of Amplifiers by the Use of Active
Elements in the Interstage
F. Higher Mode Problems
1. Steady-State Propagation of Electromagnetic Waves
along Cylindrical Structures
2. Transmission through Large Metallic Waveguides
G. Locking Phenomena in Microwave Oscillators
55
55
55
58
58
59
59
60
63
63
IX.
80
80
82
84
84
85
85
86
86
Miscellaneous Problems
A. Electronic Differential Analyzer
B. An Impedance Function Analyzer
C. Proton-Velocity Meter
D. Electronic Potential Mapping
E. Physical Limitations of R-F Radiating Systems
F. Mathematical Problems c,"44
G. Scattering of Electronic Waves. Matrix Methods
H. A D-C Amplifier
1
65
65
68
70
70
71
73
73
74
74
74
75
75
75
76
76
79
79