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Old 08-15-2014, 05:47 AM
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Eric Dollardís Cosmic Ray Detector

Ericís Cosmic Ray Detector, deserves its own thread so all the information is located in one place rather than scattered, thus Iíve started a new thread for this topic.

The following are reposts of Ericís drawings and certain notes.
My efforts of construction and testing will follow when ready. Anyone is welcome to post their efforts regarding the Cosmic Ray Detector (CRD) or related information.

Original Circuit:


The OA4G has application as a radiant matter detector. The main circuit consists of a Western Electric Telephone Bell in series with the plate supply. The bell condenser should be connected in shunt to the bell windings. A contact should be fitted to the bell armature to break the cathode connection to the OA4G in order to reset the tube. See the Marconi Coherer detector.

(4) The cosmic anode lead connects to the trigger or grid lead of the OA4G. There must be NO DC leakage to ground. For cosmic anodes see Vassilatos "Vril Compendium", and the experiments of Luigi Galvani.

(5) As for detectors into the outer limits the common regenerative detector is the circuit of choice. It is a development of E.H. Armstrong, see "Empire of the Air". The Regenerative Detector is also developed in the Russian parametric paper, an important study. Radionic receivers here are possible, depending on the metallic-dielectric geometry used. Connection with a magnification transformer is possible.

Updated Circuit:


A capacitor has been added to charge the cathode to a negative high potential. This facilitates the tube being able to emit. The capacitor will be in one of two states, either charging (out of the circuit), or running (connected to the cathode)



The HV DC charging source must not be in the tube circuit. The smallest possible capacitance that still allows the tube to fire is desirable. A small capacitance won't have enough stored energy at low voltages however, so high voltage DC is required: 0-10 KV.

Different capacitor values at different voltages need to be tried, experimentation is required. Curves need to be drawn showing the minimum voltage at a given capacitance is required.

The HV DC charging source must not be in the tube circuit. The smallest possible capacitance that still allows the tube to fire is desirable. A small capacitance won't have enough stored energy at low voltages however, so high voltage DC is required: 0-10 KV.

Different capacitor values at different voltages need to be tried, experimentation is required. Curves need to be drawn showing the minimum voltage at a given capacitance is required.
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Old 08-15-2014, 05:49 AM
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Old 08-15-2014, 05:50 AM
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Old 08-20-2014, 06:42 AM
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Phototubes

Spectral Curves


Spectral Curve 930 Phototube (1P40)


RCA Phototubes:

http://www.tubebooks.org/Books/Atwoo...Phototubes.pdf

Progress on CRD, case and power supply operational, with CRD housing completed.

The components are being fitted, with the pulse forming network done, sockets for tubes, DPDT relay with silvered contacts for a substitute for the bell arrangement. (Because theyíre hard to find in good condition here and the delivery costs are excessive from the USA). Other components ready and I am configuring it in the 0A4G trigger test schematic [mode] to test its functionality.

There are two different Ďshapesí available regarding the 0A4G tube, I have both to try.

Phototube 930 = 1P40 (non hydroscopic base) which is the S-1 spectral curve. Notice there is a sharp peak in a particular UV frequency, otherwise this tube is said to be sensitive to red and near IR light. I am starting out with the 1P40 phototube.

The 929 is an S-4 Phototube which is sensitive to Blue light, cuts off the red.

Photos to follow later

Sputins.
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Old 08-22-2014, 03:36 AM
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Cosmic Ray Detector Ė Parts and construction, Part 1.

Minimalistic housing made from scratch, with the 0A4G tube mounted on top. All components are located and hidden on the underside. The Power Supply is separate. The Cosmic Detector (anode), a Phototube is yet to be connected, likely within its own housing. As it is experimental, various configurations may be trailed.


Cosmic Ray Detector housing



04AG Gas Triode, Cold Cathode, Starter Anode Type.

ďAn exceptionally useful tube, with many possible applications in the control of moderate amounts of current with medium voltage swing, is the type 0A4G glow- discharge relay tube, triode. The 0A4G is intended primarily for service as a relay tube and is designed especially for use in an electrical system for the remote tuning and control of line -operated radio receivers. Only a small amount of electrical energy is required to actuate the 0A4GĒ.


1P40 Phototubes, one is a RCA branded one, the other a General Electric version.

ďThe 1P40 is a fairly standard example of a cold cathode phototube. The tube contains a centrally located anode and a curved photosensitive cathode, most likely coated with Cesium to act as a getter. The tube is lightly pressurized with an argon fill gas to enhance conditions inside the tubeĒ.
ďThe 1P40 is sensitive to red and infrared light - an S1 spectral response. The similarly constructed, blue-sensitive 1P39 is the light sensing element used in the AN/ASH-4 Light & Time Recording Set, a light-sensing device used to determine the yield of a nuclear explosionĒ.

The Vintage Technology Association - Detection Tubes
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Last edited by Sputins; 08-22-2014 at 03:38 AM.
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Old 09-18-2014, 07:51 AM
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Underside

Progress slowed due to being interstate for one reason or another along with other impedances. New relay acquired which should serve better than the cheap one shown. Shouldnít be too long before the first tests begin. Still a fair bit to complete though.



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Old 09-25-2014, 07:20 AM
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CRD Construction, part 2.

HV capacitors:

These are tiny HV capacitors, two times [series] 2pF @ 5KV, to give 1pF @ 10KV. Six in parallel gives 6pF at 10KV. This is for the HV cap to assist the cathode of the 1P40 Phototube as per the circuit. Capacitors come with their own aluminium housing [shield]. (Extracted from old ICPMS instruments). Other caps to try if unsuitable or if capacity is too low.



Underside part2:

Circuit is based on both the 0A4G test fire circuit together with the updated Phototube detection circuit the Cosmic Ray Detector. (Both circuits in one)



There are inputs for up to 190V DC, 12VDC (relay coil and buzzer) and HV cap charging supply 0-10KV.

The test fire circuit is complete, with testing to begin very soon.

HV supply, Phototube detector housing and various arrangements to follow in part 3.

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Last edited by Sputins; 09-26-2014 at 01:18 AM.
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Old 01-16-2015, 04:04 AM
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Testing 1,2,3..

The HV DC (10Kv) section is not yet installed, however it is constructed and will be mounted in the power supply housing soon. Iím at the stage using the test fire circuit of determining the minimum amount of capacitance needed (at my 190v DC supply voltage) to trigger the 0A4G. Currently the 1uF cap isnít enough, (assuming my circuit is working correctly) but it does alter the corona slightly on the 0A4G when test button is pressed. So itís working it seems, but not quite there yet..

Pictures show the current overall setup, the power supply, the CRD main housing and circuit and the 1P40 Phototube. (The Phototube either mounted directly, or via an extension lead). Photo shows the 0A4G all a-glow, a lovely corona on it.







More work and likely further modifications are needed, but this version of the CRD is close to working, hopefullyÖ
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Old 03-05-2015, 08:43 AM
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Cosmic Ray Detector

I assume that the Cosmic Ray Detector is built so when someone builds the Cosmic Ray collector they can use the detector to make sure it is built right and really collecting Cosmic Ray?

I can not think of another reason for having one.

Where is the collector thread?

Mikey
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