AVANCE TwoBay (or three) Cabinet optimized for solids

AQX

The acquisition control system AQX generates all digital control signals as specified by the user’s pulse program. The CCU runs as a "diskless UNIX" client and controls TCU, FCU’s, RCU and GCU. The TCU controls all timings and pulses. The FCU’s generate RF phases, frequencies, and control the RF amplitudes and modulation. Amplified, demodulated and digitized NMR signals are fed to the RCU which performs real time digital filtering. The optional GCU generates the gradient shapes for GRASP experiments. For fast data acquisition the fast digitizer (FADC) is coupled to the RCU.

AQR

The acquisition rack AQR contains all the RF/AF components for signal routing, transmitting and receiving purposes. The signal is mixed down from RF frequency by the SE451 to audio frequency and then digitized by the ADC. The LO frequency is generated on the SE451 which is controlled by the RXC. For broadband applications the SE451 is followed by the antialiasing filters FTLP/4M and the FADC. - The RF frequencies are shaped by the ASU’s, and routed to the appropriate RF transmitters. The RF transmitters are controlled by the ACB module. Routing and output power information is displayed on the BSMS keyboard. The 4-Phase Modulator performs fast phase adjustment for solids.

Synthesizer

The excitation signal for each channel is generated by combination of the appropriate FCU and synthesizer.

RF Transmitter

The linear RF transmitters generate both pulsed and CW frequencies for each channel with appropriate amplitudes.

SE451 Receiver Module

The SE451 is used as a frequency generation unit in conjunction with the synthesizer and FCU. It generates transmitter signals and contains the quadrature receiver. It uses an IF of 451 MHz. For wide line applications a fast n * 90 degrees phase shifting device is on board.

High Power Accessory

For experiments at kilowatt power levels, and for wide line applications, ultrafast 90 degree phase shifting and a high speed digitizer (FADC) are required.

Four manuals are available for this accessory: B-HPCU User Manual, High Power User Manual, Power Router Technical Manual, Power Filter RF Specifications.

BSMS

The BSMS unit provides NMR sample control (SLCB), shim (SCB) and H0 current (LCB) control, houses the digital lock (LTX, LRX), and also houses the optional gradient amplifier (GAB).

HPPR Preamplifier Module

The HPPR amplifies, filters and routes the NMR response signals from the probe to the SE451 receiver. It switches the output of the RF transmitter to the probe. - The HPPR can be equipped with the optional High Power module (HPHP).

Probes

General information common to most probes can be found here. See the appropriate NMR probe documentation for details.

Magnet

General handling and maintenance information for all magnets can be found here. Specific documents are supplied with each magnet.

GRASP (optional)

GRASP (Gradient accelerated spectroscopy) uses self screening gradient cools and allows for preemphasis compensation of residual Eddy Currents.

Sample Changer (optional)

Bruker Automated Sample Changer's (BACS) allow the user to easily and effectively perform automatic experiments.