A high temperature superconducting, HTS, magnet system. The HTS magnet system comprises an HTS field coil, a temperature control system, a power supply, and a controller. The HTS field coil comprises a plurality of turns comprising HTS material; and a resistive material electrically connecting the t
A high temperature superconducting, HTS, magnet system. The HTS magnet system comprises an HTS field coil, a temperature control system, a power supply, and a controller. The HTS field coil comprises a plurality of turns comprising HTS material; and a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material. The temperature control system is configured to control the temperature of the coil, the temperature control system comprising at least a cryogenic cool system configured to keep the coil below a self-field critical temperature of the HTS material. The power supply is configured to supply current to the HTS field coil. The controller is configured to cause the power supply to provide a current greater than a critical current of all of the HTS material.
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1. A high temperature superconducting, HTS, magnet system comprising: an HTS field coil comprising: a plurality of turns comprising HTS material;a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material;a temperature con
1. A high temperature superconducting, HTS, magnet system comprising: an HTS field coil comprising: a plurality of turns comprising HTS material;a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material;a temperature control system configured to control the temperature of the coil, the temperature control system comprising at least a cryogenic cool system configured to keep the coil below a self-field critical temperature of the HTS material;a power supply configured to supply current to the HTS field coil;a controller configured to: cause the power supply to provide a current greater than a critical current of all of the HTS material. 2. An HTS magnet system according to claim 1, and comprising: a sensor configured to measure a temperature of the coil and/or a magnetic field produced by the coil;wherein the controller is further conf3igured to adjust the magnetic field strength of the coil by: monitoring readings from the sensor in order to determine a magnetic field strength of the coil;causing the temperature control system to lower the temperature of the coil in the case that the measured magnetic field strength of the coil is less than a desired magnetic field strength of the coil, and to raise the temperature of the coil in the case that the measured magnetic field strength of the coil is greater than the desired magnetic field strength of the coil. 3. An HTS magnet system according to claim 2, wherein the temperature control system comprises the power supply, and is configured to increase the temperature of the HTS field coil by increasing the current supplied to the HTS field coil, and to decrease the temperature of the HTS field coil by decreasing the current supplied to the HTS field coil, such that the supplied current remains greater than the critical current of all of the HTS material. 4. An HTS magnet system according to claim 2, wherein the temperature control system comprises a heater in thermal contact with the HTS field coil. 5. A method of operating a high temperature superconducting, HTS, field coil, the HTS field coil comprising a plurality of turns comprising HTS material, and a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material; the method comprising: supplying current to the HTS field coil such that a transport current of the HTS field coil is greater than a critical current of all of the HTS material;controlling the temperature of the HTS field coil. 6. A method according to claim 5, further comprising; monitoring one of: a temperature of the HTS field coil;a magnetic field produced by the HTS field coil;controlling the magnetic field strength of the HTS field coil by: determining a magnetic field strength of the coil from results of said monitoring;decreasing the temperature of the coil when the measured magnetic field strength is less than a desired field strength of the HTS coil;increasing the temperature of the coil when the measured magnetic field strength is greater than a desired field strength of the HTS coil. 7. A method according to claim 6, wherein increasing the temperature of the HTS field coil comprises one or more of: increasing power supplied to a heater in thermal contact with the HTS field coil;decreasing cooling provided by a cooling system of the HTS field coil; andincreasing the current supplied to the HTS field coil. 8. A method according to claim 6, wherein decreasing the temperature of the HTS field coil comprises one or more of: decreasing power supplied to a heater in thermal contact with the HTS field coil;increasing cooling provided by a cooling system of the HTS field coil; anddecreasing the current supplied to the HTS field coil, such that the current remains greater than the critical current of the HTS material in all of the HTS material. 9. An HTS magnet system comprising: an HTS field coil comprising: a plurality of turns of HTS material separated by a resistive material which is sufficiently electrically conductive to allow radial sharing of current between the turns;a temperature control system comprising a cooling system configured to keep the temperature of the HTS field coil below a self-field critical temperature of the HTS material;a power supply configured to supply current to the HTS field coil; anda controller configured to: cause the power supply to provide current sufficiently high to saturate the HTS material in the coil so that it all operates at its critical current;reduce the magnetic field generated by the HTS field coil by increasing the current supplied by the power supply, and increase the magnetic field generated by the HTS field coil by decreasing the current supplied by the power supply. 10. A high temperature superconducting, HTS, magnet system comprising: a plurality of HTS field coils, each comprising: a plurality of turns comprising HTS material;a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material;a temperature control system configured to control the temperature of each coil, the temperature control system comprising at least a cryogenic cool system configured to keep each coil below a self-field critical temperature of the HTS material;a power supply configured to supply current to the HTS field coil;a controller configured to: cause the power supply to provide a current to each field coil greater than a critical current of all of the HTS material in the HTS field coils;cause the temperature control system to adjust the temperature of each HTS coil and thereby adjust the contribution of each HTS coil to the magnetic field. 11. A magnet system according to claim 10, and comprising a magnetic field sensor array configured to measure a magnetic field produced by the plurality of HTS field coils; wherein the controller is further configured to: determine a magnetic field profile of the HTS magnet system from the measured magnetic field;cause the temperature control system to adjust the temperature of each HTS coil in order to achieve a desired magnetic field profile. 12. A magnet system according to claim 10, wherein the power supply is configured to supply the same current to each HTS field coil, and wherein the controller is configured to adjust the temperature of all of the coils by adjusting the power supply current, while keeping the current greater than the critical current of all of the HTS material in all of the HTS field coils. 13. A magnet system according to claim 10, wherein the temperature control system comprises a heater for each HTS field coil, and wherein the temperature control system is configured to adjust the temperature of each of the HTS field coils individually by controlling the heat provided to the respective coil by each heater. 14. A method of operating a high temperature superconducting, HTS, magnet system, the HTS magnet system comprising a plurality of HTS field coils, each comprising a plurality of turns comprising HTS material and a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material, the method comprising: supplying current to each of the HTS field coils such that a transport current of the HTS field coil is greater than a critical current of all of the HTS material;controlling the HTS magnet system by controlling the temperature of each of the HTS field coils, 15. A method according to claim 14, and comprising: monitoring a magnetic field produced by the HTS magnet system;adjusting the temperature of each HTS field coil in order to achieve a desired magnetic field profile. 16. A method according to claim 14, wherein the same current is supplied to all of the HTS field coils, and controlling the temperature of each of the HTS field coils comprises adjusting the temperature of all of the HTS field coils by adjusting the supplied current. 17. A method according to claim 14, wherein controlling the temperature of each of the HTS field coils comprises controlling power supplied to a respective heater in thermal contact with each HTS field coil. 18. A method of determining the critical surface of a high temperature superconducting, HTS, conductor, the method comprising: forming the HTS conductor into an HTS field coil comprising: a plurality of turns comprising the HTS conductor;a resistive material electrically connecting the turns, such that current can be shared radially between turns via the resistive material;operating the HTS field coil with a transport current which is greater than the critical current of all of the HTS conductor;measuring a temperature of one or more points on the HTS field coil;measuring a magnetic field produced by the field coil;determining the critical surface of the HTS conductor from said measurements. 19. A method according to claim 18, and comprising determining the critical current of a sample of the HTS field coil, and using said determined critical current to set the transport current. 20. A method according to claim 18, wherein the transport current is set to a value greater than an expected peak critical current of the HTS tape. 21. A method according to claim 18, wherein the transport current is ramped up until a monotonic relationship between the measured temperature and magnetic field strength is observed, and the transport current at that point is determined to the greater than the critical current of all of the HTS tape.
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