5SHX0845F0001 3BHL000385P0101 Semiconductor Device

5SHX0845F0001 3BHL000385P0101 Semiconductor Device

This paper presents the development and characterization of a fully controllable solid-state on-off switch based on Integrated Gate Commutated Thyristor (IGCT) technology. The switch is specifically designed for applications in linear particle beam accelerators, notably in driving long-pulse Klystron Modulators. The key specifications and features of the described switch are detailed below:

1. IGCT-Technology: The switch utilizes Integrated Gate Commutated Thyristor (IGCT) technology, a type of thyristor with integrated gate control for efficient switching.
2. Application: The switch is commonly employed in linear particle beam accelerators and has demonstrated successful operation in various Institutes and National Laboratories.
3. Performance Ratings:
   • Voltage Rating: 4.4 kVdc
   • Peak Current: 1850 A
   • Pulse Duration: 2 ms
   • Repetition Rate: 2 Hz
   • Fault Conditions: Can turn off 3700 A

5SHX0845F0001 3BHL000385P0101 Semiconductor Device

SWITCH SPECIFICATIONS

The described solid-state switch was specifically designed and optimized for a crucial application in a long-pulse klystron modulator utilized in a linear beam accelerator at CERN in Geneva, Switzerland. The following specifications outline the key characteristics of the IGCT switch:

1. Application:
   • The switch is designed for continuous use in a Klystron modulator for a linear particle beam accelerator, specifically driving two Klystrons in parallel.
2. Turn-Off Safety:
   • Ensures safe turn-off in case of arcing in the tube, addressing the critical aspect of operation.
3. Design Choice:
   • To address the need for a safe turn-off without the complexity of a high-voltage solid-state switch, the end user opted for an optimized solution.
   • The chosen solution involves a medium voltage switch and a step-up pulse transformer.
4. Table 1 – Main Switch Data:
   • Charge Voltage (Vdc): 4.4 kV
   • Max. Peak Voltage: 9.0 kV
   • Rated Turn-Off Current: 1850 A
   • Max. Turn-Off Current: 3700 A
   • Pulse Width (Typical): 2 ms
   • Pulse Width (Maximum): 2.3 ms
   • Pulse Repetition Rate: 2 Hz
   • Max. Stray Inductance: 3 µH
   • Ambient Temperature Range: 5 … 40°C
   • Cooling Method: Convection Air
5. Operating Conditions:
   • The switch is intended for continuous operation in an ambient temperature range of 5 to 40°C.
6. Cooling Method:
   • Convection air cooling is employed, allowing for efficient heat dissipation during operation.

5SHX0845F0001 3BHL000385P0101 Semiconductor Device

The described specifications highlight the tailored design of the solid-state switch to meet the specific requirements of the linear particle beam accelerator at CERN. The emphasis on safety, turn-off reliability, and the chosen design approach underscore the thoughtful consideration given to the unique demands of the application.