Charge changing collisions between an energetic lithium ion beam and a hydrogen plasma
The cross section for charge changing collision between energetic lithium ions and protons was measured. The cross section for the final electron removal from lithium, {sigma}{sub p}{sup 23}, was determined for lithium impact energies in the 375 to 435 keV range. An ion beam was generated using a magnetically insulated racetrack diode energized by the Castor pulse power generator which supplied a 520 to 600 kV, 125 nsec fwhm pulse to the diode. The diode accelerated the lithium ions as Li{sup +}. Lithium chloride was used as a flashover source to produce ion beams which, when vacuum baked at 300C and cleaned with a 30 W pure argon glow discharge, contained approximately 60% Li, 30% Cl and 10% H. These ions were passed through an energy analyzer and then directed along the axis of a theta pinch which contained a hydrogen plasma. The theta pinch machine had a coil that was 71 cm long and 10.5 cm in diameter which was energized by a 25 kJ main capacitor bank at 150 kHz and preionized with a 1.5 kJ bank at 400 kHz. The plasma line integrated density, as determined by holographic interferometry, was between 3 and 12 {times} 10{sup 17} cm{sup {minus}2} and the plasma electron temperature, as determined from spectroscopic observations, was between 15 and 25 eV. After exciting the plasma the ion change states were analyzed with a Thomson spectrometer. Cross sections were determined by comparing the measured ratios of lithium charge states to the results of a Monte Carlo code which used theoretical calculations for {sigma}{sub p}{sup 23}. It was determined that the theoretical cross sections needed to be scaled by a factor of 1.51 {plus minus} .75 to best match the data indicating a general agreement with theory. The measured cross sections had a value of 2.64 {plus minus} 1.31 {times} 10{sup {minus}18} cm{sup 2} for {sigma}{sub p}{sup 23} at a lithium impact energy of 406 {plus minus} 23 keV.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- OSTI ID:
- 5655551
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
EXPERIMENTS ON CHARGE-CHANGING COLLISIONS OF LITHIUM IONIC AND ATOMIC BEAMS
THE Li(p,n)Be REACTION AND THE FUNDAMENTAL STRUCTURE OF THE Be$sup 6$ NUCLEUS
Related Subjects
HYDROGEN IONS
ION-ION COLLISIONS
LITHIUM IONS
CHARGE EXCHANGE
CHARGE STATES
CROSS SECTIONS
DATA
INTERFEROMETRY
ION BEAMS
KEV RANGE 100-1000
MONTE CARLO METHOD
PLASMA
PROTONS
BARYONS
BEAMS
CHARGED PARTICLES
COLLISIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
INFORMATION
ION COLLISIONS
IONS
KEV RANGE
NUCLEONS
700380* - Elementary & Classical Processes in Plasmas- (1992-)