SUPERCONDUCTING ROCK
MAGNETOMETER
CRYOGENIC SYSTEM
MANUAL

CONTENTS

A.         INTRODUCTION:

            A.1      Calibration data for specific system

            A.2      Summary Helium Transfer Procedure

            A.3      Suggested data recording

1.         SYSTEM EVACUATION AND COOLDOWN

            1.1       Checking Vacuum

            1.2       Pumping on the SRM Vacuum

            1.3       Pumping on the Helium Reservoir

            1.4       Leak Testing

            1.5       Cool Down with Cryocooler Precool

            1.6       Cool Down with Helium Transfer and Cryocooler

2.         LIQUID HELIUM REFILLS

            2.1       Preparation

            2.2       Begin Transfer

            2.3       Stop Transfer

            2.4       Using a Second Supply Dewar

            2.5       Concluding the Transfer

3.         INSTRUMENTATION

            3.1       Helium Level Gauges

            3.2       Thermometers

            3.3       Heaters

            3.4       Field Nulling Coils

            3.5       Switching the Superconducting Shield

4.         PLUGS IN FILL, VENT OR SAFETY

            4.1       Air Plug in Fill Line

            4.2       Air Plug in the Vent Line

            4.3       Pumping on the Plugged Line to Clear

            4.4       Clearing a Plug by Alternately Pumping and Pressurizing a Line

            4.5       Venting the SRM Through the Fill Port When the Vent  Port is Plugged

5.         CRYOCOOLER MAINTENANCE AND PROBLEMS

            5.1       Replacement of the adsorber

            5.2       Cold head sticking noises

            5.3       Cold head replacement

6.         HAZARDS OF SYSTEM EXPLOSION

7.        TELEPHONE, E-MAIL AND FAX CONTACTS FOR 2G ENTERPRISES

Back to top