▶ CIQTEK EPR Spectrometer Modernization and Upgrade Pathways
▶ Microwave Bridges
CW Microwave Bridge Features
X-band
• Microwave frequency range: 9.2 to 9.9 GHz
• Max output microwave power in leveled mode: 200 mW
• Microwave attenuator: 0 to 60 dB in 1 dB steps
• Support automated and manual tuning
• Modernizable to Q-band
• Size: 85 × 62 × 18 cm
Q-band
• Microwave frequency: 33.7 to 34.4 GHz
• Max output microwave power: 100 mW
• Microwave attenuator: 0 to 50 dB
• Size: 65 × 62 × 20 cm
Pulsed Microwave Amplifier Features
Solid-state amplifiers have the same linearity and intermodulation distortion as traveling-wave tube amplifiers. Still, they are smaller, have a longer life, and do not require high-voltage power supplies or periodic operation.
X-band
• Microwave amplifier power: 500 W
• Size: 43 X 35 X 15 cm
Q-band
• Solid-state power amplifier power: 200 W
• Size: 45 × 40 × 16 cm
▶ EPR Spectrometer Console & Magnetic Power Supply
CW Part Features
1. Magnetic Field Controller: Magnetic field stability in sample region: 10 mG/hour; Operating range: -0.1 to 1.8 T
2. Digital Lock-in Detection
3. Ultra Stable Magnet Power Supply
4. Modulation Frequency Range: 0.5 to 120 kHz
Pulsed Part Features
Data Acquisition Unit
• Number of channels: 2
• Sampling rate: 1 GHz
• Supports internal and external trigger modes
Pulse Generator
• 12 digital channels
• Time resolution: 0.05 ns
Resonators
▶ High-Q Resonator
1. Cavity resonance frequency: 9.5 to 9.9 GHz
2. Unloaded Q ≥ 16,000 (critically coupled)
3. Maximum modulation field amplitude: 20 Gauss
4. Compatible with the nitrogen and helium variable temperature system
5. Autotune available
Resonator width: 50 mm
Optical window: Ø 5 mm, compatible with optical fiber
Maximum sample access: Ø 10 mm
▶ Dual Mode Resonator
1. Cavity resonance frequency：9.6 to 10 GHz (perpendicular mode), 9.4 to 9.8 GHz (parallel mode)
2. Maximum modulation field amplitude: 10 Gauss
3. Compatible with the nitrogen and helium variable temperature system
Resonator width: 46 mm
Optical window： Ø 5 mm, compatible with optical fiber
Maximum sample access: Ø 10 mm
▶ PW-4201-DR Pulsed Resonator
1. Cavity resonant frequency: 9.4 to 9.8 GHz
2. Resonator bandwidth: 400 ± 40 MHz
3. Detection dead time: ≤ 100 ns
4. Compatible with the nitrogen and helium variable temperature system
Sample rod: 423 mm
Optical window: 5 × 12.5 mm
Flange: KF50
Available sample tube diameter: 3 mm or 4 mm OD
▶ ENDOR Pulsed Resonator
1. Cavity resonant frequency: 9.4 to 9.8 GHz
2. Resonator bandwidth: 400 ± 40 MHz
3. Detection dead time: ≤ 100 ns
4. Compatible with the nitrogen and helium variable temperature system
Sample rod: 423 mm
Optical window: 5 × 12.5 mm
Flange: KF50
Available sample tube diameter: 3 mm or 4 mm OD
Cryogenic Systems
▶ Liquid Helium Continuous-Flow Cryogenics System
Controllable Temperature Range (Sample Area): Standard: 4.4–300 K; Optional: 3.2–300 K
Temperature stability: ± 0.1 K (in liquid helium temperature zone)
Rapid cooling: cooling time < 30 minutes
Low liquid helium loss
Easy installation
▶ Liquid Helium-Free Dry Cryogenic System
Controllable temperature range of sample area: 4 to 300 K
Temperature stability: ± 0.1 K (in liquid helium temperature zone)
Wider temperature control range
Stable and easy operation
Rapid temperature recovery after sample change (<30 minutes)
Extremely low operating costs
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L-Type Cryostat
Compatible with the DR pulsed resonator and the ENDOR resonator.
Cavity ID: 45 mm (wet system); 43 mm (dry system)
▶ Liquid Nitrogen Variable Temperature System
Controllable temperature range of the sample area: 93 to 573 K
Temperature stability: ± 0.2 K
Rapid cooling: cooling time < 30 minutes
Compatible with high-temperature testing
