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Sheet1 Requirements for High Field 600 MHz Nuclear Magnetic Resonance Spectrometer
| # | Description |
| 1 | Spectrometer Console: all electronics except NMR probes |
| 1a | Transmitter |
| A minimum of 3 RF transmitter channels |
| Minimum of 12.5 ns timing resolution on each channel |
| Synchronicity on all channels within 12.5 ns |
| Frequency range for each channel of 15 to 600 MHz (41K to 1H) |
| 1 GB pulse sequencer waveform memory with specific minimum capabiliites of amplitude, phase, and frequency switching--see Table 1. |
| 4 trigger inputs with 12.5 ns resolution |
| 2 high frequency high power RF amplifiers for 1H and 19F observe and decoupling at 600 and 564 MHz respectively with minimum RF peak power of 500 W |
| 2 low frequency high power RF amplifiers for X observe and decoupling at 15 to 600 MHz with minimum RF peak power of 500 W |
| 1b | Receiver--Note that the RF channels may transmit and receive |
| Capable of digitizing signals in the frequency range of 10 to 600 MHz 15-242 MHz (41K to 31P) |
| Up to a 10 MHz spectral width and a digital resolution of 17 and 19 bits for SWH < 5 MHz and 1 MHz respectively |
| The gain within the receiver console must be controllable over a range greater than 60 dB in ≤6 dB steps. |
| The recovery time from end of blanked pulse to linear operation within the receiver console much be less than 3 ms. |
| Two high power high frequency RF preamplifiers for 1H and 19F observe, 1H and 19F decoupling and 19F lock operation featuring ~1.0 dB system noise figure, maximum 4 kW peak power RF capability, active transmit/receive switch and built-in RF power detector |
| Two high power high frequency RF preamplifiers for observe and decoupling of nuclei from 57Fe up to 19F with built-in 1H Stop RF filter featuring ~1 dB system noise figure, maximum 4 kW peak power RF capability, active transmit/receive switch |
| Preamplifier for observe and decoupling of nuclei from 57Fe up to 19F with built-in 1H Stop RF filter featuring ~1.4 dB system noise figure, maximum 500 W peak power RF capability, active transmit/receive switch |
| Preamplifier for 13C observe and decoupling operation featuring ~1.4 dB system noise figure, maximum 500 W peak power RF capability, active transmit/receive switch and built-in RF power detector |
| High power RF preamplifier for 2H observe, 2H decoupling and 2H lock operation featuring ~1.4 dB system noise figure, maximum 500 W peak power RF capability, active transmit/receive switch and built-in RF power detector |
| 1c | Hardware accessories |
| Gradient amplifier equipment compatible with solution NMR probe |
| Low temperature equipment including digital control unit to allow operation down to 77 K |
| High temperature equipment including digital control unit to allow operation up to 150 °C |
| Microprocessor based MAS pneumatic unit capable of maintaining spinning accuracy to < 0.1% over entire temperature operation range for all probes purchased. |
| Gas flow system to control sample insert/eject and variable temperatures within probes |
| Field lock equipment |
| RF filters necessary to achieve the full acquisition capabilities of the Spectrometer and the NMR probes, e.g., High pass RF filter with Pass Band 1H and Stop Band < 31P and 19F ; Low Pass RF filter with Pass Band < 31P and Stop Band 1H - 19F |
| 1d | Computer and software |
| A detailed description of the computer used to control the Spectrometer and the software requirements for processing and pulse programming are provided separately. |
| 2 | Superconducting Magnet |
| Standard Bore (SB) with 54 mm bore size |
| Very high field stability with a guaranteed drift rate of <10 ppb/hr |
| Low loss cryostat with 365-day (1-year) helium hold time under stabilized conditions (T=20 °C, p=1030 mbar) |
| Small fringe field in vertical and horizontal direction--5 Gauss line must be within 3 m in all directions |
| Cryogenically cooled high order shim system with 14 shim gradients |
| Room temperature shim system with 36 shim gradients, current sources, B0 coils, and temperature sensor |
| Magnet stand with damping system |
| Helium flow system with one-way check valve for safe operation |
| Helium level measurement system including alarm functions for low helium levels |
| Nitrogen level sensor with direct display function |
| Helium transfer line for standard ceiling height. |
| 3 | NMR probes |
| 3a | Solution NMR probe optimized for direct X-nuclei observation with 1H and/or 19F decoupling and for 1H observation (indirect detection). |
| X-nuclei frequency range 19F (564 MHz), 31P (243 MHz)-109Ag (28 MHz) excluding 171Yb (106 MHz)-9Be (84 MHz) |
| Designed for 1H and/or 19F decoupling |
| Minimum 19F background |
| Compatible with 2H lock |
| Incorporates Z-gradient with 5 G/A*cm when used with gradient amplifier equipment |
| Variable temperatue (VT) range: -150 °C to +150 °C |
| Automatic tuning and matching. |
| 3b | Double resonance X/F-H 0.7 mm CP-MAS probe for solid state NMR probe with maximum rotation frequency of 111 kHz |
| Maximum rotation frequency equal to 111 kHz or greater |
| X tuning range from 15N to (61 MHz) to 31P (243 MHz). |
| High power 1H or 19F decoupling |
| Active sample volume: 0.35 ul |
| Variable temperature range: 5 °C to 50 °C |
| Rotor test station for checking the spinning properties of 0.7 mm MAS rotors before NMR measurements--includes base station and module optimized for 0.7 mm rotors |
| 0.7 mm MAS ZrO2 Rotors and related tools |
| Stereo Microscope 40x magnification used to support packing of 0.7 mm MAS rotors |
| 4 | Installation and training |
| Included in the purchase cost, the contractor shall provide complete installation of the new spectrometer (with the exception of plumbing and electrical connection and/or any building modifications)—this includes all related expenses including shipping, magnet startup cryogens, and travel. The contract shall also dispose of the existing 500 MHz Varian spectrometer. |
Included in the purchase cost, the contractor will also provide at least two days of on-site training.
Department of the Navy