Page:Design and Calibration of a New Apparatus to Measure the Specific Electronic Charge.pdf/33

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1000 volt sources operates the SRL-6 Klystron through a battery stabilized voltage regulator and supply. The reflector voltage for the SRL-6 is supplied by batteries. The circuit for the SBL-6 regulator and supply is shown in Fig. 16. The 8529 Klystrons have disc cathodes which are indirectly heated by bombardment with 1000 volt electrons. The other l000 Volt supply from the dynamotors mentioned above is used for this bombarder supply. The high voltage (4000 volts.) for the amplifier Klystrons is supplied by a 6000 volt generator which is part of the permanent equipment of the Bridge Laboratory. This generator is very large and heavy and is capable of supplying several amperes. As our load is relatively quite small (600 MA) the large rotational inertia of the machine insures a steady voltage. Both the oscillator and the amplifier Klystrons require forced air cooling. This is supplied by four blowers which operate on 28 volts D.C. and are operated in series on the 110 volt d.c. house line. In addition to the air cooling the anodes of the 8529's must be water cooled.

2.6 Protective Systems.

The complexity and value of many of the parts of the apparatus make it imperative to guard various components of the system from accidental damage. We have accordingly installed the following protective devices.

A possible water failure could, in the case of the vacuum system, deposit cracked pump oil throughout the apparatus. In the case of the Klystrons a water failure during operation would irreparably damage the tubes. We have therefore put interlocking water switches in the exhaust lines of the cooling water to both the oil pump and to the Klystrons. In the case of the oil pump this switch turns the pump power off in