The stabilization system of 400-750 Kv pulsed accelerating voltage
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| Дата: | 1999 |
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| Формат: | Стаття |
| Мова: | English |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
1999
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| Назва видання: | Вопросы атомной науки и техники |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/81370 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | The stabilization system of 400-750 Kv pulsed accelerating voltage / V.N. Zubetz, V.I. Derbilov, S.K. Esin, E.S. Nikulin, O.T. Florov, V.P. Yakushev // Вопросы атомной науки и техники. — 1999. — № 3. — С. 52-54. — Бібліогр.: 3 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-813702015-05-15T03:02:27Z The stabilization system of 400-750 Kv pulsed accelerating voltage Zubetz, V.N. Derbilov, V.I. Esin, S.K. Nikulin, E.S. Florov, O.T. Yakushev, V.P. 1999 Article The stabilization system of 400-750 Kv pulsed accelerating voltage / V.N. Zubetz, V.I. Derbilov, S.K. Esin, E.S. Nikulin, O.T. Florov, V.P. Yakushev // Вопросы атомной науки и техники. — 1999. — № 3. — С. 52-54. — Бібліогр.: 3 назв. — англ. 1562-6016 http://dspace.nbuv.gov.ua/handle/123456789/81370 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| format |
Article |
| author |
Zubetz, V.N. Derbilov, V.I. Esin, S.K. Nikulin, E.S. Florov, O.T. Yakushev, V.P. |
| spellingShingle |
Zubetz, V.N. Derbilov, V.I. Esin, S.K. Nikulin, E.S. Florov, O.T. Yakushev, V.P. The stabilization system of 400-750 Kv pulsed accelerating voltage Вопросы атомной науки и техники |
| author_facet |
Zubetz, V.N. Derbilov, V.I. Esin, S.K. Nikulin, E.S. Florov, O.T. Yakushev, V.P. |
| author_sort |
Zubetz, V.N. |
| title |
The stabilization system of 400-750 Kv pulsed accelerating voltage |
| title_short |
The stabilization system of 400-750 Kv pulsed accelerating voltage |
| title_full |
The stabilization system of 400-750 Kv pulsed accelerating voltage |
| title_fullStr |
The stabilization system of 400-750 Kv pulsed accelerating voltage |
| title_full_unstemmed |
The stabilization system of 400-750 Kv pulsed accelerating voltage |
| title_sort |
stabilization system of 400-750 kv pulsed accelerating voltage |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
1999 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/81370 |
| citation_txt |
The stabilization system of 400-750 Kv pulsed accelerating voltage / V.N. Zubetz, V.I. Derbilov, S.K. Esin, E.S. Nikulin, O.T. Florov, V.P. Yakushev // Вопросы атомной науки и техники. — 1999. — № 3. — С. 52-54. — Бібліогр.: 3 назв. — англ. |
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Вопросы атомной науки и техники |
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| fulltext |
THE STABILIZATION SYSTEM OF 400-750 KV PULSED
ACCELERATING VOLTAGE
V.N.Zubetz, V.I.Derbilov, S.K.Esin, E.S.Nikulin, O.T.Frolov, V.P.Yakushev
Institute for Nuclear Research, RAS, Moscow
The stabilization system of both pulsed
accelerating voltage with amplitudes up to 750kV and
duration up to 85mcsec, and 400kV pulses with
150mcsec duration runs at the proton injector of the
linac of the Moscow meson factory [1] and provides
stability of voltage during 750kV pulse not worse than ±
0,1 %, and from pulse to pulse not worse than ±0,04 %.
The structural scheme of the pulse high-voltage stable
amplitude generator is shown in Fig. 1.
- - - - - - - - - - - -
Fig. 1. The structural scheme of the pulse high-voltage
stable amplitude generator.
The stabilization represents a compensatory
stabilizer with an adjusting element connected in
sequence. The latter is the «additional voltage» power
source (AVPS) which develops a constant voltage from
0 up to 0.8kV, connected in sequence to 12kV and 25kV
voltage sources. 12kV (R12) and 25kV (R25) rectifiers
are fed from the 50Hz three-phase network through the
adjustable transformer (AT1) and step-up transformer
(BT). AVPS, R12 and R25 feed the high-voltage pulse
modulator (HPM). The output signal of the modulator is
supplied with amplitude up to 16kV to a primary
winding of pulse transformer (PT-750), the secondary
winding of which is loaded with currents: capacity-
diode stabilizer (CDS) [2]; beam of the accelerating
tube (AT); AT water divider. The main load for PT-750
is CDS; it suppresses oscillations originating in PT-750
during the formation of 750kV high-voltage impulse,
and also determines pulse amplitude, which is
proportional to R25 voltage.
Fig. 2. The relay stabilizer scheme.
For measuring the high-voltage pulse amplitude
the capacity-type high-voltage divider (HVD) is used.
U1 feedback signal from HVD with amplitude about
52V is applied at the input of the pulse top precision
meter (PTPM) and is compared with U2 constant
voltage developed by stabilized power source (SPS). As
a result we have a mismatching signal U3=U1-U2 with
the level of about 1.5V representing the cut of the upper
part of the U1 feedback signal. To control the U2
voltage the measuring device MD2 is used. The U3
pulse signal of mismatching is applied to the input of
the electronic stabilizer (ES), where it will be converted
by a peak voltmeter (PV) into the constant positive
voltage with the value proportional to the U3 amplitude
and monitored by measuring device MD1. The signal
from PV is applied to the input of the comparator device
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. №3.
Серия: Ядерно-физические исследования. (34), с. 52-54.
52
(CD); negative 1.5V voltage from the reference supply
source (RSS) is applied to the other CD input.
Fig. 3. The high-voltage pulse stabilizer scheme.
53
The difference signal is amplified: by the voltage
amplifier (VA); by the power amplifier (PA); by the
magnetic amplifier (MA). The MA load is AVPS. To
control MA output voltage the MD3 measuring device
is used. As U1 voltage is increased the U3 value is also
raises; this results in decrease of the «additional
voltage» and therefore in decrease of U1, and vise
versa. The transition to the new U1 stabilized value is
realized by U2 variation, and by AT1 regulation in case
the system has exceeded the bounds of the zone of
electronic stabilizing. AT1 regulation may be realized
both "manually"- through the manual control (MC), and
automatically - through the relay stabilizer (RS). The
2V-variation of UIPM reference voltage corresponds to
the greatest (200V) possible variation of MA output
signal - the whole range of electronic stabilizing. When
there are greater mismatches in the stabilization system,
RS performs a continuous AT1 output voltage variation
in the direction of reducing mismatch. When
approaching a zone of electronic stabilizing, RS
performs a pulsed AT1 voltage variation. The last RS
impulse sets AT1 voltage level approximately at the
center of the zone of electronic stabilizing. That is how
a smooth transition from the relay mode of stabilizing to
the electronic one is achieved.
The RS electric scheme is shown in Fig.2. PV
output signal serves as a driving signal for RS. C1 and
C2 comparators exercise a continuous control over
AT1; C3 and C4 comparators and the generator based
on C5 chip exercises pulse modulation of AT1
continuous control.
As a result, PHVG instability from pulse to pulse
is now not worse than ±0.04%.
The scheme of the stabilizer of high-voltage
pulses is shown in Fig. 3. PTPM is realized on M1 chip,
C1 capacitor and D3 diode. PV is based on M2 chip, D5
diode, C2 capacitor. M3 chip and T1 transistor produce
approximately 50% PV «step reduction» in the
beginning of each pulse. M4 and M5 chips serve for the
matching of PV output with MD1 and CD input. CD is
the voltage repeater based on M6 chip. Two signals are
applied to its non-inverting input: a positive signal from
PV and a negative signal from RSS. The difference
signal is applied to VA, which consists of the integrator
based on M7 chip and differentiator based on M8 chip.
The basic elements of PA are: M9 chip and T2 output
transistor loaded with MA which includes transformers
Tr1 and Tr2. AVPS includes the step-up transformer
Tr3 and the rectifying bridge.
The top of high-voltage pulse is controlled by
CDS, but due to current flow in CDS during pulse the
voltage increases sawtoothly by approximately 9kV.
The sawtoothly reducing voltage generator (SVG) with
the amplitude 9kVand duration 150mcsec was made in
1995. SVG has a manual amplitude adjustment and a
delayed-pulse generator triggering (PG1).
The sawtooth voltage is formed at grounding
resistor 0.3kOm which is connected with the low-
voltage CDS terminal when the capacitor C=36mcF
discharges through a thyristor and a pulse step-up
transformer. This facility allows to compensate the
irregularity of the amplitude on the top of high-voltage
pulse up to the level as low as ±0,1 %.
Time responses of the closed stabilization system
loop are shown in Fig.4 where the variations of CD
output mismatch signal are indicated at: a) two-step
network voltage variation; b) feedback loop disclosing
and closing. The transition period is 1.1s.
а)
0
20
40
60
80
100
0 0,5 1 1,5 2 2,5 3 3,5
t(sec)
U(mV)
b)
-100
0
100
200
300
400
-0,5 0,5 1,5 2,5 3,5 4,5
t(sec)
U(mV)
Fig.4. Time responses of mismatch signal variation
REFERENCES
1. 1.A.S.Belov et al. Proceedings of the XII
International Conference on Electrostatic
Accelerators. Obninsk (in Russian), 1997, p.199.
2. V.N.Zubetz et al. Operation of the 400-750kV
Pulse Voltage Multi-cascade Discriminator. //
Problems of Atomic Science and Techn. 1999. v. 3.
Issue: Nuclear Physics Researches. (35), p. 38.
3. A.V.Fateev. Raschet avtomaticheskih sistem.
Moskva, Visshaya shkola, (in Russian) 1973,
p. 205-211.
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