diagnostic equipment of high-current pulsed ion beams
DESCRIPTION
Action mechanism of ion beam HPIB Melt region Ion range 1-2 mkm Ablation plasma Stress wave 108-109 К/с 1-5 J/cm2TRANSCRIPT
Diagnostic Equipment of High-current Pulsed Ion Beams
A. Pushkarev Tomsk Polytechnic University, Russia Faraday cup
Time-of-flight diagnostics Thomson Parabola spectrometer Thermal
imaging diagnostics of powerful ion beams Acoustic diagnostics
Pin-diode Measurement of ion beam divergence Analysis of
correctness of diagnostic of high current pulsed ionbeam by ion
current density Action mechanism of ion beam
HPIB Melt region Ion range 1-2 mkm Ablation plasma Stress wave /
1-5 J/cm2 Z.H. Dong, C. Liu, X.G. Han, M.K. Lei Induced stress wave
on the materials surface irradiated by high-intensity pulsed ion
beam // Surface & Coatings Technology 201 (2007) 50545058 A
schematic drawing of the device for dynamical measurement of stress
wave. The waveforms of measured induced stress in pure Ti
irradiated by HIPIB at an ion current density of 350 A/cm2.
Schematic diagram of PVDF detecting system
Xiaoyun Le, Xiaoping Zhou, Sha Yan, Zhijian Liu, Weijiang Zhao.
Detection of Shocks Generated by the Irradiation of Nanosecond
Intense Pulsed Ion Beam and Electron Beam // 15 International
Symposium on High Current Electronics: Proceedings. Tomsk:
Publishing house of the IAO SB RAS, pp. Schematic diagram of PVDF
detecting system Shock signal induced by IPIB of TEMP II Xiaoyun
Le, Sha Yan, Zhijian Liu, Weijiang Zhao Detection of shocks
generated by intense pulsed ion beam irradiation // Surface &
Coatings Technology 01/2007; 201(9): X. P. Zhu, F. G. Zhang, Y.
Tang, J. P. Xin, M. K
X.P. Zhu, F.G. Zhang, Y. Tang, J.P. Xin, M.K. Lei Dynamic response
of metals under high-intensity pulsed ion beam irradiation for
surface modification // Nuclear Instruments and Methods in Physics
Research B 272 (2012) 454457 Illustration of spacetime diagram for
the processes of stress wave generation and propagation in titanium
target under HIPIB irradiation. Stress waves for the titanium
targets of 3 mm thickness irradiated at the different ion current
densities of 200400 A/cm2, respectively. Scheme of generation and
recording of acoustic waves
The acoustic diagnostics of a pulse ion beam ion beam sensor 5 m
Scheme of generation and recording of acoustic waves zoom in
Waveforms of the signal measured by PZT Pushkarev A.I., Isakova
Yu.I., Xiao Yu, Khailov I.P. Characterization of intense ion beam
energy density and beam induced pressure on the target with
acoustic diagnostics // Review of Scientific Instruments, 2013,
vol. 84, iss. 8, (2013) The delay of the acoustic signal
The delay of the acoustic signal in the copper tavern length of 5
meters. At a delay of 1.36 ms of the acoustic signal in the tavern
5 meters velocity of propagation of acoustic waves is equal to 3680
m / sec. 2.7 . 0.77 2.7 3510 /. /. The shape of the acoustic
signal
The signal from the piezoelectric transducer. Tavern 2 5 mm, length
2.7 meters. Two pulses. The signal from the piezoelectric
transducer. Two pulses with IIP and 2 pulse without IIP (diode
closed screen). Calibration of the piezosensor on energy
density
Thermal imprint of the beam on the target (a) placed behind the
strip and the cross sectional distribution of the beam energy
density (b) in vertical (1) and horizontal (2) cross section A
piezosensor signal while ion beam radiation with the different
energy density Results of calibration
melting Cu 1356 K J= 2J/cm2 The calibration dependence of the PZT
signal amplitude on the ion energy density The temperature
distribution in copper target irradiated with C+ ions at different
times after interception with the beam The simulation was made
using the Comsol Multiphysics program for the following parameters:
pulse duration of 100 ns and ion beam energy density of 2 J/cm2.
Phase transformation was not taken into account. The results of
statistical analysis
Shot-to-shot variation in the energy density for 35 shots with a
120 second time interval between shots (a), with a 10 sec interval
using acoustic diagnostics (b) The results of statistical analysis
of the beam energy density reproducibility in a self-magnetically
insulated ion diode showed that the standard deviation of the
energy density at a high repetition rate (time interval between
measurements of 10 sec) does not exceed 11%, Calibration of the
piezosensor by the drop calibration method
In a quantitative sense, a piezoeffect is characterized by a
piezomodulus d: where q is an occurring charge, F is a modulus of a
force, C is a piezosensor capacity, U(t) is a recorded potential
difference in the piezosensor electrodes Then, a force is connected
with a recorded voltage by the relation: k is a coefficient of the
piezosensor sensitivity, N/V The coefficient of the piezosensor
sensitivity is equal to:
where a is the acceleration, m is a lading weight, v is the lading
velocity change for time t. With the piezosensor calibration lading
hung on a hair, falls down from the height h, hitting on the
transducer end surface. At this time the lading velocity changes
from maximum to zero, and this velocity change is equal to the
lading velocity in the lowest point. It can be determined with the
help of the energy conservation law. There after, we can get: In
general, with the velocity change, influencing on the piezosensor
(and correspondingly recorded voltage): A piezosensor signal while
the calibration by lading with the mass of 50 grams, with the
lading lifting on 12 mm (1), 50 mm (2), 80 mm (3). In the course of
calibration we rated the integral of the second positive signal
half-wave, coming from the piezosensor, like in the course of
getting calibration piezosensor signal amplitude dependence on PIB
energy density. The value of the piezosensor sensitivity for the
series of 10 measurements 447 kN/V. With PIB absorption in the
target an increased pressure zone appears
With PIB absorption in the target an increased pressure zone
appears. This zone forms acoustic oscillations. A pressure value is
equal to: where S is the area of the copper wire radiation by an
ion beam, equal to 750 mm2. Dependence of maximum pressure in the
zone of PIB absorption on the energy density Target Ti. Ion beam
350 keV, 200-400 A/cm2, 150 ns, H+.
Dependence of maximum beam generated pressure in the target on the
input energy density Target Al. Ion beam (660 keV, 120 ns),
containing C+ ions (40%) and protons. Target Ti. Ion beam 350 keV,
A/cm2, 150 ns, H+. Target Cu. Ion beam (660 keV, 120 ns),
containing C+ ions (40%) and protons. Pushkarev A.I., Isakova
Yu.I., Xiao Yu, Khailov I.P. Characterization of intense ion beam
energy density and beam induced pressure on the target with
acoustic diagnostics // Review of Scientific Instruments, 2013,
vol. 84, iss. 8, (2013) Investigation of energy density
distribution over cross-section
ion beam distance =3600 m/s t The comparison of the form of PZT
signal (2) with that of the energy density distribution over the
cross section measured using infrared imaging diagnostics (1)
Scheme measuring sound waves generated by the IPI signal from the
piezoelectric transducer and the two pulse. Shank portion is closed
with tape. Acoustic diagnostics of a pulsed electron beam
Oscillograms for different beam profiles:1 - without absorber;2 -
with the absorber. Scheme screening the central part of the beam
Diagnostic Equipment of High-current Pulsed Ion Beams
A. Pushkarev Tomsk Polytechnic University, Russia Faraday cup
Time-of-flight diagnostics Thomson Parabola spectrometer Thermal
imaging diagnostics of powerful ion beams Acoustic diagnostics
Pin-diode Measurement of ion beam divergence Analysis of
correctness of diagnostic of high current pulsed ionbeam by ion
current density 5. Pin-diode Electrical circuit of the PIN-diode
diagnostics Spiral ion diode Photo of the diode chamber, waveform
of the power supplied to the diode, and a signal from the pin-diode
Photo of the diode chamber, waveform of the power supplied to the
diode, and a signal from the pin-diode