DATASHEET . a/sec 9 10 (Note 11) 5 6.3 (Minimum Minutes) (Note 12) @ Er = 6.3Vac (Aac)@ Er = 6.3Vac 5.5 Nominal (Vac) @ Ef = 6.3Vac, (Aac)@ Ef = 6.3Vac, 12.5 A TYPICAL OPERATING CONDITION A TYPICAL OPERATING Ir, Nom. Reservoir Heater Current Ir, Time Warm-Up tk, Tube epy, Peak Forward Voltageepy, ib, Peak Forward Anode Currenttp, Anode Current Pulse Duration Pulse Repetition RatePrr, 10 kv Anode CurrentIb, Average CurrentIp, RMS Average ka 1.0 0.5 µsec. Pb, Anode Dissipation Factor (V x A x pps) Maximum Anode Current Rise Ratetr, 4,000 Hz 2.0 Adc 1x10 45 Aac 45x10 GENERAL ELECTRICAL DATA (Vac)Ef, Heater If, Nom. Cathode Heater Current Reservoir Heater Voltage, Er, 6.3 ± 5% Imaging Telecom a/sec 9 11 5 ka .1 ib 20 kV 10 µsec. 47.5 Aac 25 kv www.perkinelmer.com/opto Thyratrons Lighting (Notes 1, 2 & 3) (Note 8) (Note 5) (Note 7) (Notes 4, 5 & 6) (MAXIMUMS)(NONSIMULTANEOUS) (Note 9)

tr, Maximum Anode Current Rise Ratetr, 1X10 epy, Peak Forward Anode Voltage epy, ABSOLUTE RATINGS SPECIFICATIONS Description thyratron. The hydro- The HY-3002 is a hydrogen-filled, at a moderately-high gen gas fill facilitates reliable operation when compared to voltage and very high pulse repetition rates pulse currents are similar deuterium-filled thyratrons. High convection cooling. The achievable using only free or forced air in any position. tube may be mounted by its mounting flange ibx, Peak Reverse Anode Current epx, Peak Reverse Anode Voltage epy Min., Minimum Anode Supply Voltagetp, Anode Current Pulse Duration Anode CurrentIb, Average Current Ip, RMS Average 1 kV DC Pb, Anode Dissipation Factor (V x A x pps)(Note 10) 2.2 Adc 50x10

ib, Peak Forward Anode Current HY-3002 Thyratron Hydrogen TRIGGERING REQUIREMENTS 8. The reverse anode voltage shown applies for a previously non- MIN. TYP. MAX. conducting tube. Exclusive only of a spike not longer than 25 egy, Peak Open Circuit Trigger nanoseconds, the peak reverse anode voltage must not exceed 1 kv Voltage (Forward) (V) 500 750 1500 during the first 50 microseconds after conduction. Zg, Driver Circuit Output Impedance (Ohms) --- 100 400 9. Ip is the true root mean square (RMS) current. For relatively Driver Pulse Rise Time (ns) --- 100 150 rectangular shaped current pulses without a reverse current, the Driver Pulse Width (µs) 1 2 --- RMS anode current may be approximated as the square root of the Peak Reverse Grid Voltage (V) ------400 product of the peak current and the average current. Bias Voltage (Negative) (V) ------300 10. Forced air or liquid immersion cooling should always be used TRIGGERING CHARACTERISTICS in any situation where cooling by natural convection is insufficient MIN. TYP. MAX. to keep the temperature of the tube's envelope below 200°C. Anode Delay Time (nS)(Notes 13 & 14) ------500 Typically, a room temperature air flow of 50 to 150 cfm directed Anode Delay Time Drift (nS)(Note 14)------150 into the anode cup will be sufficient. When the tube is cooled by Time Jitter (nS)(Note 14) ------5 immersion in a force-circulated liquid coolant, the anode dissipa- tion factor may be tripled provided that the envelope temperature NOTES does not exceed 200°C.

1. The dwell time at the peak anode voltage should be minimized 11. Typical, simultaneous operating conditions other than the in order to minimize prefiring. For operation at the rated epy, the example shown in this data sheet might also be acceptable. The dwell time must not exceed 10 milliseconds. conditions shown herein produce a discharge current waveform of the peak forward anode current shown and no current reversal. 2. After thyratron anode current stops flowing and before voltage The pulse width is measured at the half peak current level. The is reapplied to the anode, the anode voltage must stay between 0 RMS current is approximated using the relationship shown in note and -500 for at least 10 µS to allow the gas to deionize. 9. The average current is the product of the stored charge (in the pfn being switched by the thyratron) and the pulse repetition rate. 3. This tube may be operated in air at up to 25 kv. Some of the more important derating factors that determine the safe operating 12. The optimum reservoir heater voltage is that which provides voltage in air are the cleanliness of the tube's ceramic insulators, the best overall compromise among anode heating, anode voltage the rate of rise of anode voltage, the dwell time at the operating holdoff and holdoff recovery, anode current rise rate, and the tube's peak anode voltage, the pulse repetition rate, and ambient pressure, overall triggering characteristics. For most applications, the opti- temperature, humidity and contaminant level. This tube may also mum reservoir heater voltage lies between 90% and 110% of the be operated while immersed in an insulating gas or liquid. nominal value. Operation at below 90% of nominal can result in permanent damage from anode overheating; operation at 4. The peak current capability of 5 ka applies to, short pulse high reservoir heater voltages degrades anode holdoff and holdoff (tp < 0.3 µs) duration applications. recovery, and can permanently damage the reservoir itself.

5. The pulse width is measured on the discharge current waveform 13. The anode delay time is measured from the 25% point on the at the half peak current level. rise of the unloaded grid voltage pulse to the 10% point on the rise of the anode current pulse. 6. For anode current pulse widths greater than 0.3 microseconds but less than 10 microseconds, a useful formula for estimating the 14. Delay time, delay time drift and time jitter may be simultane- allowable peak current is ib = ib0 (3/tp)1/2 amps, where tp is the ously minimized by applying the maximum grid drive voltage pulse width in microseconds, and ib0, the peak current rating at tp (egy) at a high rate of rise of voltage from a source of low imped- = 3 microseconds, is 1,500 amps for this tube. ance (Zg).

7. This tube is not designed to conduct current in the reverse 15. All data and specifications are subject to change without direction. The tube will have a tendency to cut-off conduction in notice. the reverse direction but may not be able to stop reverse conduc- tion if the reverse voltage across the thyratron is high enough. In 16. Data sheet origination date is shown on the front page. This the case where there is conduction in the reverse direction, the data sheet becomes obsolete when more recent revisions are pub- absolute value of the reverse peak current must be limited to no lished. more than 10% of the peak value of the previous positive half cycle of the thyratron current waveform. ANODE CONNECTION STUD

RESERVOIR HEATER LEAD T (RED)

CATHODE HEATER LEAD (YELLOW)

CATHODE CONNECTION THYRATRON MOUNTING FLANGE

TUBE SCHEMATIC SYMBOL

DIMENSIONS IN INCHES 1/4 DIA. DIA. NOM. 3 9/32 1 DIA. MAX. ANODE CONNECTION STUD PROJECTION 1/4-20 UNC 3 NOM. 5/8 MIN. THREAD LENGTH 3 1/16 STUD DOES NOT MAX PROTRUDE ABOVE 4 25/32 MAX. DIM.

.030 CONTROL GRID GRID 4.165 NOM. TAB TAB 4 1/4 MAX.

.040 CATHODE CONNECTION THYRATRON MOUNTING FLANGE

10 NOM. 1.150 NOM. 1 1/4 MAX. HEATER 2 FEED-THROUGHS 9 MIN. 11 MAX. LEADS TYP. RESERVOIR HEATER LEAD 3 NOM RED MATES WITH #10 STUD 3 1/16 CATHODE HEATER LEAD MAX YELLOW MATES WITH 1/4 STUD TUBULATION PROTECTOR A A

BOTTOM VIEW HY-3002 .27

FULL RADIUS TYPICAL

.219 DETAIL "A" 45 SLOTTED HOLE DIM. 4

5/8 TYP. 4.500 DIA. NOM. SLOTTED MOUNTING HOLES 3 4 9/16 DIA. MAX. 1PAIR TYPICAL DETAIL "A" FOR HOLE SIZE

1.9 TY

TUBULATION R TR PROTECTOR

7/32 DIA. LEAD ATTACHMENT HOLE TYP. 856 TYPICAL TYP. .219

VIEW A-A BOTTOM VIEW NOTES 1 DO NOT APPLY MORE THAN 35 INCH-POUNDS OF TORQUE TO THE ANODE CONNECTION STUD WHEN ATTACHING OR REMOVING THE ANODE LEAD. 2 CONTACT PERKINELMER APPLICATION ENGINEERING BEFORE DOING ANYTHING WITH THE SCREWS IN THE HEATER FEED-THROUGHS. THE TUBE HERMETIC SEAL MAY BECOME COMPROMISED IF EXCESSIVE TORQUE OR OTHER LOADS ARE APPLIED TO THE FEED-THROUGHS. PERKINELMER WILL GIVE YOU A PROCEDURE FOR REMOVING AND/OR REPLACING THE LEADS. 3 THERE ARE 4 PAIRS OF SLOTTED MOUNTING HOLES THAT ARE EQUALLY SPACED AROUND THE THYRATRON MOUNTING FLANGE AS SHOWN IN THE BOTTOM VIEW. DETAIL "A" GIVES THE DIMENSIONS OF EACH SLOTTED HOLE. 4 THE ANGULAR ORIENTATION OF THE TUBULATION, HEATER FEED-THROUGHS, AND GRID TAB WITH RESPECT TO THE SLOTTED MOUNTING HOLES IS AS SHOWN IN THE BOTTOM VIEW. THE ANGULAR ORIENTATION OF EACH OF THOSE ITEMS WITH RESPECT TO THE SLOTTED MOUNTING HOLES IS HELD TO WITHIN 10 DEGREES. THE ANGULAR ATTACHMENT OF THE HEATER LEADS IS ARBITRARY.

For more information email us at [email protected] or visit our web site at www.perkinelmer.com/opto Note: All specifications subject to change without notice.

USA: PerkinElmer Optoelectronics 35 Congress St. Salem, MA 01970 P: (978) 745-3200 F: (978) 745-0894 .

© 2001 PerkinElmer, Inc. All rights reserved. DS-198 Rev A 0901

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