E2V Technologies MG5125 Tunable S-Band Magnetron - Alphatron

E2V TechnologiesMG5125Tunable S-Band MagnetronThe data should be read in conjunction with the MagnetronPreamble and with British Standard BS9030 : 1971.ABRIDGED DATAMechanically tuned pulse magnetron intended primarily forlinear accelerators.Frequency range(cooling water 40 8C) . . . . . . 2993 to 3002 MHzPeak output power . . . . . . . . . . . . 2.0 MWMagnet . . . . . . . . . . . . . . separateOutput . . . . . . . . to no. 10 (WR284) waveguide(72.14 x 34.04 mm internal)Cooling . . . . . . . . . . . . . . . waterThe use of an isolator is recommended (see note 1)GENERAL DATAElectricalCathode . . . . . . . . . . . . indirectly heatedHeater voltage (see note 2) . . . . . . . 8.5 VHeater current . . . . . . . . . . . 9.0 APeak heater starting current,not to be exceeded . . . . . . . . 20 A maxCathode pre-heating time(minimum) . . . . . . . . . . . . 3.0 minMechanicalOverall dimensions . . . . . . . . . . . see outlineNet weight . . . . . . . . . . . . 8 kg approxTuner revolutions to cover frequency range(see note 3) . . . . . . . . . . . 4.75Mounting position (see note 4) . . . . . . . . . anyAccessoriesElectromagnet (see notes 5 and 6) . . . MG6061/MG6062Waveguide transition . . . . . . . . . . . M4152SCoolingThe magnetron is water cooled and has an integral waterjacket. The recommended water flow is 5 litres per minute ormore; a pressure of approximately 1.25 kg/cm 2 will benecessary to give this rate of flow. The outlet watertemperature must not exceed 50 8C.E2V Technologies Limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU England Telephone: +44 (0)1245 493493 Facsimile: +44 (0)1245 492492e-mail: enquiries@e2vtechnologies.com Internet: www.e2vtechnologies.com Holding Company: E2V Holdings LimitedE2V Technologies Inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY10523-1482 USA Telephone: (914) 592-6050 Facsimile: (914) 592-5148e-mail: enquiries@e2vtechnologies.us#E2V Technologies Limited 2002 A1A-MG5125 Issue 4, September 2002527/5584

10. The various parameters are related by the formula:Pi = i apk xv apk xDuwhere Pi = mean input power in wattsi apk = peak anode current in amperesv apk = peak anode voltage in voltsand Du = duty cycle.11. The maximum variation of mean output power when themagnetron is rotated through 3608 around any axis of themagnetron will not be greater than 6%.12. The frequency of the magnetron will vary after theapplication of anode voltage. Typically the frequency willbe 0.5 MHz high 20 seconds after switching on HT and0.1 MHz high 5 minutes after switching on.13. With a water flow rate of 5.0 litres per minute.14. The maximum variation of frequency when the magnetronis rotated through 3608 around any axis of the magnetronwill not be greater than 1.0 MHz.15. With the magnetron operating into a VSWR of 1.15:1.Pulses are defined as missing when the RF energy level isless than 70% of the normal energy level in a 0.5%frequency range. Missing pulses are expressed as apercentage of the number of input pulses applied duringthe period of observation after a period of 10 minutesoperation.16. Measured with heater voltage of 8.5 V and no anode inputpower, the heater current limits are 8.0 A minimum, 10.0 Amaximum.HEALTH AND SAFETY HAZARDSE2V Technologies magnetrons are safe to handle and operate,provided that the relevant precautions stated herein areobserved. E2V Technologies does not accept responsibility fordamage or injury resulting from the use of electronic devices itproduces. Equipment manufacturers and users must ensurethat adequate precautions are taken. Appropriate warninglabels and notices must be provided on equipmentsincorporating E2V Technologies devices and in operatingmanuals.High VoltageEquipment must be designed so that personnel cannot comeinto contact with high voltage circuits. All high voltage circuitsand terminals must be enclosed and fail-safe interlock switchesmust be fitted to disconnect the primary power supply anddischarge all high voltage capacitors and other stored chargesbefore allowing access. Interlock switches must not bebypassed to allow operation with access doors open.RF RadiationPersonnel must not be exposed to excessive RF radiation. AllRF connectors must be correctly fitted before operation so thatno leakage of RF energy can occur and the RF output must becoupled efficiently to the load. It is particularly dangerous tolook into open waveguide or coaxial feeders while the device isenergised. Screening of the cathode sidearm of high powermagnetrons may be necessary.X-Ray RadiationHigh voltage magnetrons emit a significant intensity of X-raysnot only from the cathode sidearm but also from the outputwaveguide. These rays can constitute a health hazard unlessadequate shielding for X-ray radiation is provided. This is acharacteristic of all magnetrons and the X-rays emittedcorrespond to a voltage much higher than that of the anode.#E2V Technologies MG5125, page 3

HEATER VOLTAGE REDUCTION SCHEDULE106526B864HEATER VOLTAGE (V)200 1.0 2.0 3.0 4.0MEAN INPUT POWER (kW)MG5125, page 4#E2V Technologies

RECOMMENDED PARAMETERS FOR VARIOUS POWER LEVELSMAGNETIC FIELD (mT)110 120 130 140 150 1552.56525A2.01.5NORMALOPERATINGCONDITIONSPEAK POWER (MW)1.00.525 30 35 40 45ANODE VOLTAGE (kV)60 70 80 90 100ANODE CURRENT (A)73 72 71 7 1 / 2 0FREQUENCY CHANGE (MHz)#E2V Technologies MG5125, page 5

OUTLINE (All dimensions without limits are nominal)6828A1ABHOLE 1FON AF PCD2 HOLES THREADED1 / 4 "-28 UNF-2B BY Z DEEP2282281X1H8 HOLES 1AAON AF PCDSEE NOTE 31ACHOLE 1YON AF PCDAEREFERENCEPLANE ‘A’REFERENCEPLANE ‘B’CSEE NOTE 1UVKJSEE NOTE 2T3 HOLES THREADED10-32 UNF-2B BY G DEEPEQUISPACED ON H PCDSEE NOTE 4A‘X’SQLWATER JACKETCONNECTIONSTHREADED 1 / 4 " BSPBC1NR1PFD1MSEE NOTE 51E8 HOLES 1AGEQUISPACED ON AH PCDSEE NOTE 3HOLE THREADEDM8 x 1.25-6HBY AJ DEEPScrap View in Direction ‘X’MG5125, page 6#E2V Technologies

RefMillimetresA 370.0B 135.5C 89.0D 3.2E 104.9F 35.0G 6.5H 19.05J 73.82 + 0.20K 25.0L 12.5 + 0.5M 133.5N 94.85P 91.82Q 5.55R 31.4S 191.5T 55.96 + 0.16U 6.35 + 0.10V 107.0 + 0.3W 51.0X 38.0Y 6.40 + 0.05Z 6.0 maxAA 8.0 + 0.1AB 152.25AC 19.0AD 8.00 + 0.05AE 107.0AF 139.7AG 6.4 + 0.1AH 120.65 + 0.13AJ 15.0 maxOutline Notes1. This surface is marked with the letter ’C’ to indicate thecathode terminal.2. The magnetron will fit between magnet poles 76.45 mmdiameter and 75.44 mm apart.3. Positional tolerance of holes 0.15 mm diameter.4. Positional tolerance of holes 0.05 mm diameter.5. Positional tolerance of flange 1.5 mm diameter with respectto reference planes A and B.Whilst E2V Technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any usethereof and also reserves the right to change the specification of goods without notice. E2V Technologies accepts no liability beyond that set out in its standardconditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.#E2V Technologies Printed in EnglandMG5125, page 7