Powerful switch based on CX1525A thyratron
Thyratrons of obsolete types TGI1-2500/50, TGI1-2500/35, TGI1-5000/50 are used in modulators of NSC KIPT of as a switch, their service life has expired. To update the modulator we selected thyratron СХ1525А of company EЕV, which technical parameters met the requirements: switched current 2.3 kA, ano...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2014
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| Цитувати: | Powerful switch based on CX1525A thyratron / I.A. Chertishev, M.V. Ivakhnenko, D.A. Kaplij, E.A. Khomyakov, A.I. Kosoi, V.Yu. Titov, Yu.D. Tur, V.A. Tsymbal, E.I. Zajtsev, I.N. Zajtsev // Вопросы атомной науки и техники. — 2014. — № 3. — С. 75-78. — Бібліогр.: 3 назв. — англ. |
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nasplib_isofts_kiev_ua-123456789-799892025-02-10T01:08:48Z Powerful switch based on CX1525A thyratron Коммутатор на основе тиратрона CX1525A Комутатор на основі тиратрона CX1525A Chertishev, I.A. Ivakhnenko, M.V. Kaplij, D.A. Khomyakov, E.A. Kosoi, A.I. Titov, V.Yu. Tur, Yu.D. Tsymbal, V.A. Zajtsev, E.I. Zajtsev, I.N. Теория и техника ускорения частиц Thyratrons of obsolete types TGI1-2500/50, TGI1-2500/35, TGI1-5000/50 are used in modulators of NSC KIPT of as a switch, their service life has expired. To update the modulator we selected thyratron СХ1525А of company EЕV, which technical parameters met the requirements: switched current 2.3 kA, anode voltage up to 40 kV, pulse frequency up to 300 Hz, pulse duration 5 μs. Thyratron switchboard based on СХ1525А was de-signed and constructed. The results of study the switch operation in mode of active accelerator are reported. В модуляторах ННЦ ХФТИ в качестве коммутатора используются тиратроны типа ТГИ1-2500/50, ТГИ1-2500/35, ТГИ1-5000/50, ресурс которых исчерпан. Для модификации модулятора выбран тиратрон СХ1525А производства фирмы EЕV, по техническим характеристикам удовлетворяющий параметрам: коммутируемый ток 2,3 кA; анодное напряжение до 40 кВ; частота посылок до 300 Гц; длительность импульса 5 мкс. Проведена разработка и изготовление тиратронной стойки на основе СХ1525А. Приведены результаты исследования работы коммутатора в режиме действующего ускорителя. У модуляторах ННЦ ХФТІ в якості комутатора використовуються тиратрони типу ТГІ1-2500/50, ТГІ1-2500/35, ТГИ1-5000/50, ресурс яких було вичерпано. Для модифікації модулятора було вибрано тиратрон СХ1525А виробництва фірми ЕЕV, який по технічним характеристикам відповідає параметрам: комутуємий струм 2,3 кА; анодна напруга до 40 кВ; частота посилок до 300 Гц, тривалість імпульсу 5 мкс. Проведена розробка та виготовлення тиратронної стойки на основі СХ1525А. Приведено результати дослідження роботи комутатора в режимі діючого прискорювача. 2014 Article Powerful switch based on CX1525A thyratron / I.A. Chertishev, M.V. Ivakhnenko, D.A. Kaplij, E.A. Khomyakov, A.I. Kosoi, V.Yu. Titov, Yu.D. Tur, V.A. Tsymbal, E.I. Zajtsev, I.N. Zajtsev // Вопросы атомной науки и техники. — 2014. — № 3. — С. 75-78. — Бібліогр.: 3 назв. — англ. 1562-6016 PACS: 29.17.+w https://nasplib.isofts.kiev.ua/handle/123456789/79989 en Вопросы атомной науки и техники application/pdf 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 |
| topic |
Теория и техника ускорения частиц Теория и техника ускорения частиц |
| spellingShingle |
Теория и техника ускорения частиц Теория и техника ускорения частиц Chertishev, I.A. Ivakhnenko, M.V. Kaplij, D.A. Khomyakov, E.A. Kosoi, A.I. Titov, V.Yu. Tur, Yu.D. Tsymbal, V.A. Zajtsev, E.I. Zajtsev, I.N. Powerful switch based on CX1525A thyratron Вопросы атомной науки и техники |
| description |
Thyratrons of obsolete types TGI1-2500/50, TGI1-2500/35, TGI1-5000/50 are used in modulators of NSC KIPT of as a switch, their service life has expired. To update the modulator we selected thyratron СХ1525А of company EЕV, which technical parameters met the requirements: switched current 2.3 kA, anode voltage up to 40 kV, pulse frequency up to 300 Hz, pulse duration 5 μs. Thyratron switchboard based on СХ1525А was de-signed and constructed. The results of study the switch operation in mode of active accelerator are reported. |
| format |
Article |
| author |
Chertishev, I.A. Ivakhnenko, M.V. Kaplij, D.A. Khomyakov, E.A. Kosoi, A.I. Titov, V.Yu. Tur, Yu.D. Tsymbal, V.A. Zajtsev, E.I. Zajtsev, I.N. |
| author_facet |
Chertishev, I.A. Ivakhnenko, M.V. Kaplij, D.A. Khomyakov, E.A. Kosoi, A.I. Titov, V.Yu. Tur, Yu.D. Tsymbal, V.A. Zajtsev, E.I. Zajtsev, I.N. |
| author_sort |
Chertishev, I.A. |
| title |
Powerful switch based on CX1525A thyratron |
| title_short |
Powerful switch based on CX1525A thyratron |
| title_full |
Powerful switch based on CX1525A thyratron |
| title_fullStr |
Powerful switch based on CX1525A thyratron |
| title_full_unstemmed |
Powerful switch based on CX1525A thyratron |
| title_sort |
powerful switch based on cx1525a thyratron |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2014 |
| topic_facet |
Теория и техника ускорения частиц |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/79989 |
| citation_txt |
Powerful switch based on CX1525A thyratron / I.A. Chertishev, M.V. Ivakhnenko, D.A. Kaplij, E.A. Khomyakov, A.I. Kosoi, V.Yu. Titov, Yu.D. Tur, V.A. Tsymbal, E.I. Zajtsev, I.N. Zajtsev // Вопросы атомной науки и техники. — 2014. — № 3. — С. 75-78. — Бібліогр.: 3 назв. — англ. |
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Вопросы атомной науки и техники |
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ISSN 1562-6016. ВАНТ. 2014. №3(91) 75
POWERFUL SWITCH BASED ON CX1525A THYRATRON
I.A. Chertishev, M.V. Ivakhnenko, D.A. Kaplij, E.A. Khomyakov, A.I. Kosoi, V.Yu. Titov,
Yu.D. Tur, V.A. Tsymbal, E.I. Zajtsev, I.N. Zajtsev
National Science Center “Kharkov Institute of Physics and Technology”, Kharkov, Ukraine
E-mail: ch.igor@kipt.kharkov.ua
Thyratrons of obsolete types TGI1-2500/50, TGI1-2500/35, TGI1-5000/50 are used in modulators of NSC KIPT
of as a switch, their service life has expired. To update the modulator we selected thyratron СХ1525А of company
EЕV, which technical parameters met the requirements: switched current 2.3 kA, anode voltage up to 40 kV, pulse
frequency up to 300 Hz, pulse duration 5 μs. Thyratron switchboard based on СХ1525А was de-signed and con-
structed. The results of study the switch operation in mode of active accelerator are reported.
PACS: 29.17.+w
INTRODUCTION
Hydrogen thyratrons intended for generation of high-
voltage short pulses at high load currents are used as a
switch in many plants. Hydrogen thyratron made of ce-
ramic and metal as a rule has a heated cathode and a con-
trol grid. Pulse typical parameters are: duration – units of
microsecond, anode voltage – kilovolt (up to 40 kV),
switched current – units of kiloampere. Pulses are gener-
ated by quick connection a load to energy storage system,
which is discharged completely in a time of pulse dura-
tion. The voltage in anode-cathode path becomes insuffi-
cient to maintain the discharge In the course of discharg-
ing the capacitor of the energy storage system through
thyratron and load resistance the voltage in anode-
cathode path becomes insufficient to maintain the dis-
charge. Electrons and ions diffuse to electrodes and vacu-
um shell walls, settle on their surfaces and recombine
among themselves – plasma medium “decays” and the
anode-cathode path restores its insulating properties.
Connection is realized by the thyratron when relatively
low-powered voltage pulse enters the control electrode.
Modulators on hydrogen thyratrons have a number of
advantages. They are simply constructed and have a
high efficiency.
The switch is an important part of this plant. A num-
ber of requirements regarding peak operating voltage,
peak switched current, average current etc. are imposed
to it. So performance reliability of the plant [1, 2] de-
pends on selection of a switch and its constituent parts.
EXPERIMENTAL SETUP
Modulators operated in NSC KIPT active accelera-
tors are performed according to linear circuit with gen-
erating line depletion, through a pulse transformer.
Simplified electric diagram of the plant is presented in
Fig. 1. The PFN is charged through charging choke and
diode from power supply. The PFN is discharged
through TGI switch to primary winding of pulse power
transformer of amplifying klystrons. In initial state be-
fore arrival of control voltage pulse the cathode is heat-
ed up to operating temperature and grid potential is zero
(as to cathode). Anode potential is high (kilovolts), but
it doesn't accelerate electrons emitted by the cathode
due to low penetration factor of the grid. Voltage pulse
of shape close to rectangular is generated on RL load as
a result of PFN discharge. Pulse peak can be adjusted
additionally by changing the parameters of generating
line cells [3].
Fig. 1. Simplified electric diagram of the plant
Ceramic hydrogen filled thyratrons of type TGI1-
2500/50, TGI1-5000/50 and TGI1-5к/45 were used as
switches. However, most of thyratrons used in accelera-
tors failed for some time past. Thyratron СХ1525A of
company ЕEV was selected to replace the exhausted
thyratrons, as well as to update the modulator. Switch
based on deuterium filled thyratron СХ1525A was de-
veloped and implemented.
SELECTION OF A THYRATRON
Selection of a thyratron was carried out on the prin-
ciple that to minimize a number of reconnections in
modulator circuit. So the selected thyratron should have
characteristics comparable to thyratrons used in the
plant previously. The main technical parameters of thy-
ratrons used in accelerator modulators before and pa-
rameters of thyratron СХ1525A are presented in the. As
seen in the Table the technical requirements for thyra-
tron operation were met and the main reason of thyra-
tron failure was the expiry of life. The main parameters
of the selected thyratron are comparable to parameters
previously used but the maximum switching frequency
is higher. Besides, deuterium thyratrons СХ1525A are
more stable compared to conventional lamps. Thus, the
new thyratron can be used in modulator circuit in case
of connection diagram and lockouts updating. Assembly
representation of thyratron СХ1525A is presented in
Fig. 2. The thyratron has two grids G1, G2, as well as
gradient grid for distribution of anode potential over the
surface. The thyratron has a ceramic case. The overall
length is 50 mm.
mailto:ch.igor@kipt.kharkov.ua
ISSN 1562-6016. ВАНТ. 2014. №3(91) 76
Parameter name,
units of measurement
СХ1525A TGI1-2500/50 TGI1-5000/50 TGI1-5к/45
Rating Actual Rating Actual Rating Actual Rating Actual
Filament voltage, V 6.3 6 6…6.6 6.3 6.66 5.5 6.5 6.3
Filament current, А 37 37 76…94 85 2.2 190 30 29
Pulse anode voltage, kV 50 10…50 45 10…50 45 5…40 40
Pulse anode current, A 5000 2300 2500 2000 5000 2000 2500 2500
Average anode
current, А
5 4 4 3 10 3 10 4
Pulse duration, µs 50 5 30 5 16 5 0.2…50 5
Frequency, Hz 5000 300 400 300 125 300 5000 300
Cooling Air 5 cube/min Water 3 l/min Water 15 l/min Air 5 cube/min
Diagram of thyratron grids connection is presented
in Fig. 3. Hydrogen thyratrons have a potential control
with two grids. Trigger unit, which ensures feeding of
pulses of voltage 600…2000 V and duration
0.5…2 µS to two grids, is required to activate the thyra-
tron. МА2709A trigger unit of company ЕEV is used to
activate the thyratron.
G
G2
G1
Fig. 2. Assembly representation of thyratron СХ1525A:
G1 – the first grid; G2 – the second grid;
G – gradient grid
Structurally it is fastened on the switchboard. Cables
connected to it are shielded. Signals from trigger unit
are applied to thyratron grids G1, G2 via load resistors
R1, R2. Suppressors are used to protect thyratron and
trigger unit from noise pickups.
Transmitting cables from the trigger unit to the thy-
ratron, as well as from the trigger unit to lockout moni-
toring system were roved through ferrite rings in order
to avoid noises on triggering pulse or minimize them to
the permissible value. Signals from trigger unit through
dividers Rд1, Rд2 are transmitted to lockout monitoring
system. Locking is performed so that the system will not
start if at least one grid signal does not enter the lockout
monitoring system. Locking of airflow (cooling) system
is executed in the same way. Isolating transformers are
installed on transmitting cables at the modulator output.
Galvanic isolation of thyratron grids and output circuits
of the trigger unit and lockout monitoring system are
involved.
Positive voltage of ~ 500 V is applied to the first
grid providing an auxiliary discharge between cathode
and the first grid. The first grid has low resistance rela-
tive to the second grid, electron flow between grid 1 and
grid 2 increases when a pilot spark burns on the fist
grid. A signal having a pulse height (amplitude) of
≈ 100 V, durability of ≈ 0.5 μs, delayed for ~ 0.5 μs in
relating to the first pulse is applied to the second grid.
Negative bias of ~ 150 V is applied to the second grid.
This diagram of thyratron connection ensures increasing
of cathode service life.
Fig. 3. Diagram of connection of thyratron grids
Fig. 4. Signals on thyratron grids: G1 – the first grid;
G2 – the second grid
Voltage pulses on grids at heated thyratron are pre-
sented in Fig. 4. The resistance of the first grid is ~
7 Ohm. The resistance of the second grid is ~ 50 Ohm.
Voltage pulse on the second grid is 500…600 V, it is
slightly weaker. Voltage pulse on the first grid has sharp
edge enough (~ 10 kV/µs), it ensures stable operation of
ISSN 1562-6016. ВАНТ. 2014. №3(91) 77
the switch. Voltage pulse on the second grid has nega-
tive shift and delay relative to the pulse from the first
grid. Thus, the required conditions for reliable actuating
of thyratrons are observed.
Diagram of the thyratron connection is presented in
Fig. 5. СХ1525A has two grids: G1 loaded on resistance
~ 5 Ohm, G2 loaded on resistance ~ 50 Ohm and a gradi-
ent grid. Gradient divider comprises resistance-
capacitance divider R1-C1 (R1= 500 Ohm, C1 ~ 600 nF)
and ohmic devider R2 (18 MOhm, with total dissipated
power of ~10 W), this divider is required for potential
distribution up to 40 kV over the thyratron surface (ex-
ternal and internal). It renders possible to avoid or min-
imize the probability of disruptive discharge over the
surface. C2, C3 are filtering capacities.
R1
VD
VD
R1
R2
R2
C1
C1
CX1525
Rg2
G2
Rg1
C2
C3
HR
HC
G1
Rh2
Rd1
Rd2
Rh1
M
A
2
7
0
9
R1
VD
VD
R1
R2
R2
C1
C1
CX1525
Rg2
G2
Rg1
C2
C3
HR
HC
G1
Rh2
Rd1
Rd2
Rh1
M
A
2
7
0
9
Fig. 5. Diagram of the thyratron connection
TRIGGERING OF THE SWITCH
After analysis and measurement of technical param-
eters of the thyratron and the trigger unit and study the
regulations for their connection the modulator of the
accelerator КUТ-1 was triggered in operation mode. For
this purpose the lockouts were manufactured or updated,
as well as noises were reduced to the level required for
reliable operation of the accelerator. Noises were sup-
pressed by shielding of components of the thyratron
switchboard. Transformer of hydrogen generator and
metering circuit were placed into the shield. Isolating
transformers were installed on transmitting cables as
they leave modulator. Cathode ground was insulated
from common ground.
Voltage and current pulses at modulator output, as
well as initiation pulse in accelerator operation mode after
elimination of the noise pickups were presented in Fig. 6.
The following mode was obtained: voltage
U = 200 kV, klystron current I m= 140 mA, frequency
F = 200 Hz.
Accelerator LU-10 was triggered on thyratrons
СХ1525A. Diagram thyratron connection was similar
except for trigger unit. Instead of factory installed trig-
ger unit we used two on hand trigger units connected via
delay circuit, which had been used earlier in modulators
when operated with single-grid thyratrons TGI1-
5000/50 and TGI1-2500/50. Diagram of connection of
trigger units and pulses at their outputs are presented in
Fig. 7.
Fig. 6. Voltage pulse (1) at modulator output, current
pulse (2) and initiation pulse (3) in operation mode.
After elimination of noise pickups
Fig. 7. Simplified block diagram of connection of thyra-
tron grids on LU-10 and pulses from trigger blocks
Amplitude from trigger units (BT1, BT2) had a val-
ue specified in thyratron technical requirements
(~ 1200 V).
Triggering signal was applied to the input of the first
trigger block SP1. This signal was applied to the grid 1
from the output of the first trigger block through resistor
27 Ohm and network decoupling transformer. Signal
ISSN 1562-6016. ВАНТ. 2014. №3(91) 78
from the output of lockout monitoring system of the
first trigger unit C1 was applied to the input of the sec-
ond trigger unit SP2 through the delay line DL. Delay
time was 0.5 μs. Signal from the output of the second
unit, as well as for the first trigger unit, was applied to
the second grid through resistance of 27 Ohm. The pulse
from the output of lockout monitoring system entered
the lockout system. When one of trigger units failed,
then monitoring pulse did not enter locking circuit pre-
venting modulator triggering in such away.
Fig. 8. Pulses from the output of trigger block:
1 – grid 1; 2 – grid 2 and pulses on grids
of thyratron 3 grid 1; 4 – grid 2
The following operation mode was obtained on the
accelerator LU-10: voltage U2 = 250 kV, klystron cur-
rent I m = 150 mA, frequency = 250 Hz.
Trigger unit for two-grid thyratron was performed
on basis of trigger unit МА2709A. The functions of
trigger unit were enlarged – monitoring of both signals
availability was added. Galvanic isolation of output cir-
cuits trigger block and grids СХ1525A was provided.
Pulses from trigger unit and pulses on thyratron grids
were presented in Fig. 8.
Modulator based on the new trigger unit was actuat-
ed in operation mode of the accelerator КUТ-1.
CONCLUSIONS
In the course of executed work:
Triggering of the modulator based on the thyratron
СХ1525A and МА2709А trigger unit was carried out.
Switch operation was analyzed, diagram and con-
struct of trigger unit were developed, design documenta-
tion was worked out and switchboards with trigger unit,
cooling system and high-voltage anode divider were
manufactured.
Switches on basis of thyratron СХ1525А were actu-
ated in operation mode of accelerators КUТ-1, EPOS,
LU-10. Parameters and technical requirements of the
thyratron were studied and thyratron and the trigger unit
operability were checked.
REFERENCES
1. V.D. Bochkov, Yu.D. Korolev. Pulse gas-discharge
switching devices // Encyclopaedia of low tempera-
ture plasma» release / V.E. Fortov, Book.4. М.:
“Nauka”. 2000, p. 446-459.
2. V.D. Bochkov, Yu.D. Dyagilev, Yu.D. Korolev.
Powerful switchboards of current with LP of gas //
DTE. 1998, №5, p. 91-95.
3. I.V. Kazarezov, А.А. Коrepanov. Matching of the
parameters of Pulse Forming Networks (PFN) and
pulse transformers in quantizer circuits for power
supply of high-power klystrons // PAST. 1999, №4,
p. 44-45.
Article received 25.03.2014
КОММУТАТОР НА ОСНОВЕ ТИРАТРОНА CX1525A
И.А. Чертищев, М.В. Ивахненко, Д.А. Каплий, Е.А. Хомяков, А.И. Косой, В.Ю. Титов, Ю.Д. Тур,
В.А. Цымбал, Е.И. Зайцев, И.Н. Зайцев
В модуляторах ННЦ ХФТИ в качестве коммутатора используются тиратроны типа ТГИ1-2500/50, ТГИ1-
2500/35, ТГИ1-5000/50, ресурс которых исчерпан. Для модификации модулятора выбран тиратрон СХ1525А
производства фирмы EЕV, по техническим характеристикам удовлетворяющий параметрам: коммутируе-
мый ток 2,3 кA; анодное напряжение до 40 кВ; частота посылок до 300 Гц; длительность импульса 5 мкс.
Проведена разработка и изготовление тиратронной стойки на основе СХ1525А. Приведены результаты ис-
следования работы коммутатора в режиме действующего ускорителя.
КОМУТАТОР НА ОСНОВІ ТИРАТРОНА СХ1525А
І.О. Чертіщев, М.В. Івахненко, Д.О. Каплій, Е.А. Хомяков, О.І. Косой, В.Ю. Тітов, Ю.Д. Тур,
В.А. Цимбал, Е.І. Зайцев, І.М. Зайцев
У модуляторах ННЦ ХФТІ в якості комутатора використовуються тиратрони типу ТГІ1-2500/50, ТГІ1-
2500/35, ТГИ1-5000/50, ресурс яких було вичерпано. Для модифікації модулятора було вибрано тиратрон
СХ1525А виробництва фірми ЕЕV, який по технічним характеристикам відповідає параметрам: комутуємий
струм 2,3 кА; анодна напруга до 40 кВ; частота посилок до 300 Гц, тривалість імпульсу 5 мкс. Проведена
розробка та виготовлення тиратронної стойки на основі СХ1525А. Приведено результати дослідження робо-
ти комутатора в режимі діючого прискорювача.
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