CGC RFG50CF User Manual

Radio frequency generator for driving electrodynamic multipoles

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RFG50CF, Rev.3-15

Radio Frequency Generator for Driving

Electrodynamic Multipoles

Version 3-15CF

User Manual

Document version A, created on Apr-04-2023

CGC Instruments

Hübschmannstr. 18 | D–09112 Chemnitz

Tel.: +49 (371) 355 098–55

Fax: +49 (371) 355 098–60

internet: www.cgc-instruments.com

e–mail: info@cgc-instruments.com

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Page 1 Page: 1/23 RFG50CF, Rev.3-15 Radio Frequency Generator for Driving Electrodynamic Multipoles Version 3-15CF User Manual Document version A, created on Apr-04-2023 CGC Instruments Tel.: +49 (371) 355 098–55 internet: www.cgc-instruments.com Hübschmannstr. 18 | D–09112 Chemnitz Fax: +49 (371) 355 098–60...
Page 2: Table Of Contents
Page: 2/23 RFG50CF, Rev.3-15 Contents Safety Information ............4 Technical Data..............5 Characteristics ................5 Mains Supply................. 5 RF Power Supply ................5 RF Output..................5 Security ..................5 Fan Control ................... 6 Bias Voltage .................. 6 Monitoring ..................6 Device State.................. 6 General ..................
Page 3 Page: 3/23 RFG50CF, Rev.3-15 Figure List Fig. 1. The front panel of the RF generator........ 10 Fig. 2. Simplified circuit diagram of the generator...... 11 Fig. 3. View of the generator's RF terminals and the vacuum flange DN100CF with the electrical feedthroughs.... 16 Fig.
Page 4: Safety Information
Page: 4/23 User Manual RFG50CF, Rev.3-15: Safety Information Safety Information • The device may be installed and used by authorized and instructed personnel only. Read this manual carefully before installing and us- ing the device. Always follow the safety notes and warnings in this manual.
Page 5: Technical Data
Page: 5/23 User Manual RFG50CF, Rev.3-15: Technical Data Technical Data Characteristics • compact radio frequency (RF) generator • symmetrical output voltage with DC bias • digital enable control • analog RF voltage control • metallic case for DN100CF flange mount •...
Page 6: Fan Control
Page: 6/23 User Manual RFG50CF, Rev.3-15: Technical Data • over- and undertemperature protection: temperature sensor at generator's heat sink overtemperature threshold: +60°C undertemperature threshold: +10°C Fan Control • linear temperature regulation • minimum speed: below +30°C • maximum speed: above +55°C Bias Voltage •...
Page 7: Shipment Contents
Page: 7/23 User Manual RFG50CF, Rev.3-15: Technical Data • forced cooling: two 120 mm fans with air filters on the top and bottom panels two 120 mm air outlets with air filters on the side panels temperature-dependent control monitored fan operation, warning in the event of a fan failure •...
Page 8: Quick Setup Guide
Page: 8/23 User Manual RFG50CF, Rev.3-15: Quick Setup Guide Quick Setup Guide Warning: The generator can produce lethal voltages, please note the following before powering it on: • The device must be properly grounded before the mains voltage is applied. The device is intended to be mounted on a flange of a vac- uum apparatus and grounded to it.
Page 9 Page: 9/23 User Manual RFG50CF, Rev.3-15: Quick Setup Guide the outputs. Short the BNC socket DC Bias with a 50 Ω terminator, connect the mains and turn the device on. Open the short circuit at the BNC socket Enable and verify that the LED Driver Power lights up green.
Page 10: Description
Page: 10/23 User Manual RFG50CF, Rev.3-15: Description Description General The device is a radio frequency (RF) generator with an external power supply unit for its power stage. It produces two harmonic signals phase-shifted by 180°. It is self-tuning, i.e. it automatically runs at the optimum working frequency close to the resonance frequency of the output circuitry.
Page 11: Device Function
Page: 11/23 User Manual RFG50CF, Rev.3-15: Description Fig. 1. Device Function The design of the device is based on the concept from reference [1], but the circuit diagram has been significantly improved to obtain better parameters and stable RF signals. This third generation of the RF generators uses a field programmable gate array (FPGA) to integrate all control and supervision functionality.
Page 12 Page: 12/23 User Manual RFG50CF, Rev.3-15: Description frequency. The capacitance consists of the capacitance of the exter- nal load including the connection cable and of the internal capaci- tance. The latter is made up of the capacitors Co1/2 and Ca1/2 as well as the capacitance of the transformer TR and the internal stray capacitance.
Page 13: Terminals
Page: 13/23 User Manual RFG50CF, Rev.3-15: Description The device monitors the temperature of the heat sink onto which the MOSFETs are mounted via the sensor T-Sens. If the measured tem- perature exceeds a certain value, the device is disabled to prevent additional heating.
Page 14 Page: 14/23 User Manual RFG50CF, Rev.3-15: Description cord and open the fuse holder. Insert the new fuse(s), close the fuse holder, and connect the line cord back to the IEC inlet. For supplying the power stage, i.e. for adjusting the output amplitude, an adjustable DC power supply unit should be connected to the ba- nana safety sockets RF Power + and RF Power –.
Page 15 Page: 15/23 User Manual RFG50CF, Rev.3-15: Description vice is disabled and no RF is generated. Note that a common 50 Ω BNC terminator can be used for shorting. The terminals Monitor 1 and Monitor 2 are BNC sockets that provide output signals attenuated by the specified ratio.
Page 16: Installation And Operation
Page: 16/23 User Manual RFG50CF, Rev.3-15: Installation And Operation Installation And Operation Before powering on the device, read the user manual thoroughly. The device is intended to be mounted on a flange of a vacuum appa- ratus. It requires a space of at least 27 × 27 × 30 cm³ (width × height ×...
Page 17 Page: 17/23 User Manual RFG50CF, Rev.3-15: Installation And Operation remove dust from the filters and the fans in the device housing. Large dust layers substantially lower the cooling power (the device may overheat if the air filters are extremely dirty). The lifetime of dirty fans can also be significantly shorter.
Page 18 Page: 18/23 User Manual RFG50CF, Rev.3-15: Installation And Operation quire conductors with a large surface to minimize losses and prevent heating by the RF. To power the device, a power mains socket with proper grounding is required. Check the voltage rating on the front panel before connect- ing the line cord and powering on the device.
Page 19: Troubleshooting
Page: 19/23 User Manual RFG50CF, Rev.3-15: Troubleshooting Troubleshooting If the LED indicator Driver Power does not light up, check the line connection and the fuses integrated in the IEC inlet Line Input on the front panel (see Fig. 1). If the fuses are broken, check the voltage rat- ing of the device and the applied line voltage.
Page 20 Page: 20/23 User Manual RFG50CF, Rev.3-15: Troubleshooting respective cover plate. The fans are mounted on the top and bottom cover plates which can be removed by unfastening the four M3 screws fixing the respective plate (two on the front and two on the rear panel).
Page 21 Page: 21/23 User Manual RFG50CF, Rev.3-15: Troubleshooting = 1 / 2π L·C , where L is the inductance and C the capacitance of the circuit. From this, the following difference formula can be derived: ΔC / C = –2 Δf This implies that for a 1% increase of the frequency, the capacitance has to be decreased by about 2%.
Page 22 Page: 22/23 User Manual RFG50CF, Rev.3-15: Troubleshooting charges may occur at high output amplitudes that may destroy the printed circuit board. CGC Instruments Tel.: +49 (371) 355 098–55 internet: www.cgc-instruments.com Hübschmannstr. 18 | D–09112 Chemnitz Fax: +49 (371) 355 098–60...
Page 23: References
Page: 23/23 User Manual RFG50CF, Rev.3-15: References: References: 1 Cermak, I., 'Compact radio-frequency power supply for ion and par- ticle guides and traps', Rev. Sci. Instrum. 76, 063302 (2005). 2 Dawson, P. H. (ed.) 'Quadrupole Mass Spectrometry and Its Appli- cations', AIP Press, Woodbury, New York, NY (1995).