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E3730A  OPERATING  INSTRUCTIONS

 

                                                                                                         

－  14  － 

and  can  result  in  blindness  or  other  injury.  Personnel  must  be  fully  protected  from  the  microwave  energy 
which radiates from this device. All input and output RF connections, waveguide flanges, and gaskets must 
be  RF  leak  proof  and  properly  engaged.  Never  operate  this  device  without  a  microwave-energy-absorbing 
load.  Personnel  must  be  prevented  from  looking  into  open  waveguide  or  antennas  while  this  device  is 
energized. Equipment must be designed to protect all the personnel from the hazards. The label and caution 
notices must be provided on the equipment and tin the manuals warning clearly of these hazards. 
 
5.3.4 Protecting instrument 
  The following protection interlock is necessary to protect the klystron tube from change of the power-supply 

voltage, breakdown of the focusing magnet and the cooling system, and unexpected abnormal circumstances. 

Item 

Protection action value 

Point of action 

Action Speed 

Cathode warm-up time 

Within specified time 

No application by high 

voltage 

－

 

Oil level   

Oil surface is under the specified surface 

level 

Beam high voltage 

application paused 

Medium 

Ion pump current 

More than a specified value

（

Regular 

operation value plus 2

μ

A

）

 

Beam high voltage 

application paused 

High 

Water-coolant Flow   

（

Collector and body

）

 

Less than minimum ratings 

Heater high voltage 

application paused 

Bean high voltage 

application paused 

Medium 

Inlet coolant Temperature 

Maximum rate more than

（

40

℃）

 

Heater high voltage 

application paused 

Beam high voltage 

application paused 

Medium 

Heater Voltage 

Out of the specified rate 

±

5% for each 

klystron 

Beam high voltage 

application paused 

Medium   

Heater Current 

Out of the specified rate 

±

5% for each 

klystron 

Beam high voltage 

application paused 

Medium 

Beam Voltage 

Exceed the normal value plus 5% or the 

maximum rating   

Beam high voltage 

application paused 

High 

Beam Current 

Exceed the normal value plus 10% or the 

maximum rating.   

Beam high voltage 

application paused 

High 

Beam Inverse Voltage 

Exceed the rated value

（

100kV

）

 

Beam high voltage 

application paused 

High 

Load Waveguide Arc   

Discharge within waveguide   

RF application paused 

High 

Focusing magnet current 

Out of the specified rate 

±

5% for each 

klystron 

Beam high voltage 

application paused 

High 

Focusing magnet voltage   

Out of the normal value 

±

10% 

Beam high voltage 

application paused 

High 

Water-coolant flow for focusing 

magnet 

Less than the specified value 

Beam high voltage 

application paused 

Power supply for 

magnet paused 

Medium 

Inlet coolant temperature for 

focusing magnet 

Less than the specified value 

Beam high voltage 

application paused 

Power supply for 

magnet paused 

Medium 

Load waveguide pressure

 

Out of rated value

 

RF application paused

 

High

 

Summary of Contents for E3730A

Page 1: ...rmation contained herein may be changed without prior notice It is therefore advisable to contact to CETD before processing with the design of equipment incorporating this product CANON ELECTRON TUBES DEVICES CO LTD Engineering Information EI No EE E3730A 2020 08 04 High Power Pulse Klystron E3730A Operating Instructions We are appreciating your purchase of our klystron product Please read careful...

Page 2: ...IONS 1 Contents 1 Safety Precautions 2 2 Each Part Name of Klystron Tube 7 3 Marking Labels 8 4 Structure and Theory of the Operation 9 5 Related Device and Notes 12 6 Explanation of Operation and Maintenance 15 7 Inquiries 19 ...

Page 3: ...electron tube is intended and designed for use in combination with amplifier for industrial devices and scientific equipment If this electron tube is to be used with equipment other than the above contact CANON ELECTRON TUBES DEVICES CO LTD CETD in advance CETD will not be held responsible for malfunction or damage caused by the use of this electron tube in applications other than those specified ...

Page 4: ...OFF the power switch and discharge all residual charge by touching each electrode of the electron tube with a ground rod Pay particular attention to the charge in the capacitor of the high voltage section Never disable the door switch when the cage is open At least two workers are required for replacement or maintenance work to ensure safety A person who has received training in cardiopulmonary re...

Page 5: ...y will be attracted by the magnetic field possibly resulting in personal injury or damage to the electron tube 3 Do not place magnetic cards hard disk drives etc near the electron tube CAUTION Handling Only qualified engineers or persons who have received the specialized training listed below are permitted to handle this electron tube The types of specialized training required are as follows 1 Hig...

Page 6: ... as follows Copper Stainless steel Malleable iron Nickel iron alloy Tungsten Molybdenum Alumina ceramics Note that no radioisotopes or beryllia porcelain are used 4 Lead is used for the X ray shield of this electron tube Do not abrade or melt the lead because lead powder or vapor is harmful if it comes into contact with the skin or is ingested For lead disposal consult with specialized disposal pe...

Page 7: ...an cause death or serious injury Warning Magnetic field The magnetic field of 0 13 tesla generated by the permanent magnet can cause to suck an iron product and scissors Danger High voltage Do not remove the safety cover and approach and touch this section Pulse voltage of 155 kV can cause death or serious injury Warning X ray radiation X rays are radiated from all aspects of the klystron There is...

Page 8: ...E3730A OPERATING INSTRUCTIONS 7 2 EACH PART NAME OF KLYSTRON TUBE Electron Gun Section Body Section Collector Section ...

Page 9: ...ution labels Collector side Dimension 125 x 95 mm Material Aluminum film 2 Caution label Terminal for the ion pump power supply Dimension 63 x 32 mm Material Aluminum film 3 Warning label Magnet of the ion pump Dimension 63 x 32 mm Material Aluminum film ...

Page 10: ...rated at the gap of the input cavity This voltage modulates the velocity of the electrons The electrons go forward in the drift tube and then density of the electrons is modulated by difference of the velocity Resonant frequency of the intermediate cavity is tuned to frequency of the density modulation The electrons reach next cavity and velocity is modulated further by voltage at the gap of the i...

Page 11: ... microwave source for a linear accelerator E3730A can deliver peak output power of 50 MW with a pulse width of 4 0 micro seconds at frequency of 2856MHz The focusing magnet of VT 68922 is available 4 3 1 Mechanical characteristics Dimensions See outline drawing Weight Approx 140 kg without the X ray shielding kit Mounting position Vertical cathode down Cooling Liquid water 4 3 2 Connections RF inp...

Page 12: ...V 325 Peak inverse beam voltage epx kV 100 Peak cathode current ik A 400 55 Peak drive power pd W 1000 Peak RF output power po MW 52 Average RF output power Po kW 10 5 Collector dissipation Pcol kW 35 Pulse width duration epy tp epy µs 6 7 Pulse width duration rf tp rf µs 4 0 Pulse repetition rate prr pps 50 Ion pump voltage V ip kV 3 9 3 1 Load VSWR σL VSWR 1 4 Coolant flow Collector Qw c L min 3...

Page 13: ...max direct current 16 5A No 6 Coil max voltage 10 0Vdc max direct current 10 0A Stability of current 2 max c Ion pump power supply Voltage 3 5 0 4 kV d Heater power supply Voltage 20 V max Current 20 A max e High voltage power supply Voltage of the High voltage power supply must be continuous from 100 kV to the rating voltage The accelerating electrode tube body must be connected to ground since a...

Page 14: ...r voltage If there is a risk of freezing drain the coolant Please follow the following ratings about cooling the klystron tube and the focusing magnet Cool the output waveguide if necessary Collector Waveguide Focusing magnet Coolant flow min 30 L min 2 L min 10 L min Coolant temperature max 40 degrees 40 degrees 40 degrees Coolant pressure max 0 98 MPa 0 98 MPa 0 98 MPa The coolant water requires...

Page 15: ...r coolant Flow Collector and body Less than minimum ratings Heater high voltage application paused Bean high voltage application paused Medium Inlet coolant Temperature Maximum rate more than 40 Heater high voltage application paused Beam high voltage application paused Medium Heater Voltage Out of the specified rate 5 for each klystron Beam high voltage application paused Medium Heater Current Ou...

Page 16: ...er gasket One VT 69064 X ray shield kit VT 69063 X ray shield kit is factory furnished One VT 69065 Lifting attachment Bolts described in this chapter One thermocouple monitoring for electromagnet 6 1 2 Unpacking the klystron First of all the klystron with its X ray shielding lead blocks is so heavy more than 280kg lifting or supporting the klystron by hands is dangerous and must be strictly forbi...

Page 17: ...l the klystron into the electromagnet Lift up the klystron with the lifting device in vertical position the electron gun should be in the bottom Be sure the klystron is not tilted and is located just on the center of the electromagnet when lifted Remove plastic cover of the electron gun seal Check the sealing elastic around the electron gun housing is properly employed in place Install the klystro...

Page 18: ...h inside the waveguide and the flanges Be sure the surfaces of the sealing edges of the waveguide flanges and the copper gasket are clean and free from scratches oxidation or corrosion When the waveguide is evacuated up to 1 3x10 6 Pa 10 8 torr or lower pressure it is recommended to check the vacuum leak with suitable devices such as Helium leak detector 6 1 3 7 Evacuate the waveguide The E3730A k...

Page 19: ...electromagnet electrical connection Connect a pair of wire to the terminal board on the side wall of the electromagnet Make the connections of the thermal interlock output 6 1 3 13 Electromagnet water piping Connect the cooling water piping The connectors mate with SP coupler size 4S for the inlet and 4P for the outlet of NITTO KOHKI COUPLER from NITTO KOHKI U S A INC 6 1 4 Checks 6 1 4 1 Ion pump...

Page 20: ...Check the regulation before using the power supply The resistance of the coils may increase between the application of the voltage and temperature stabilization Apply the voltage to the electromagnet and adjust the current to within 1 of the prescribed value Set the min and max protection relays for the current to the prescribed value minus 5 and plus 5 respectively Check the interlocks operate in...

Page 21: ...he output power is reflected backward to the klystron Interlock system to detect the backward power must be provided and must cut off the drive power or the HV by pulse to pulse basis If the waveguide material finishing cleaning and evacuating system are properly designed and successfully operated it is not so difficult to overcome the outgassing When the waveguide is well conditioned the klystron...

Page 22: ...ube has been used recently or when it has already been put through the conditioning period described in the preceding paragraph starting of the tube can be very fast even instantaneous The klystron can be operated after one hour of cathode heat up However gradual increase of the high voltage and drive power is recommended It is far better for the tube to keep the reliability especially for the kly...

Page 23: ...d dry nitrogen gas must be inlet to the waveguide before the waveguide is opened to air In case the klystron output waveguide is exposed to air for hours the protecting cover and sealing elastic must be fastened to the output waveguide and the air inside the waveguide must be replaced with clean and dry nitrogen gas The pressure inside the waveguide must not exceed 0 02MPa 0 2kgf cm2 by gauge to a...

Page 24: ...ge To be able to put the stored klystron into operation quickly the klystron ion pump shall be operated all the time It is mandatory that the ion pump current be verified every month When the stored tube comes back to operation the same conditioning operation as for a new tube must be applied The non observation of these storage instructions can cause the manufacturer s guarantee to become null an...

Page 25: ...les Technical Services please contact the following representative SUMITOMO DEUTSCHLAND GMBH SCHWANNSTRASSE 10 40476 DUSSELDORF FEDERAL REPUBLIC OF GERMANY PHONE 49 211 4570 0 FAX 49 211 4570 236 SUMITOMO CORPORATION OF AMERICAS 9500 W BRYN MAWR AVENUE SUITE 400 ROSEMONT IL 60018 U S A PHONE 1 847 384 5200 FAX 1 847 384 0560 CANON ELECTRON DEVICES MATERIALS TRADING SHANGHAI CO LTD CEMS RM1606 SH P...

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