Super Collider Seismometer
Model SP-500

This unique instrument has been developed for the US Department of Energy for use as a wide passband highly sensitive vibration sensor in the beam focusing system of linear super-colliders (very high energy particle accelerators). As such this sensor is radiation hardened and functions normally in extremely strong magnetic fields – up to 6 Tesla.

PMD/eentec electrochemical seismic sensors are the only ones among all known sensors that can adequately perform in such environments. The sensors were successfully tested in magnetic fields up to 1T at the Stanford Linear Accelerator Center (SLAC) and demonstrated complete immunity to the field.

Each seismometer has a single component sensor that can work as either horizontal or vertical with the sensitivity axis in the direction indicated by the arrow. The sensor is essentially isotropic – i.e. it will perform equally well in any random orientation. Its extremely small dimensions fully answer severe space limitations imposed by the linear colliders focusing systems.

The sensors are planned for use on the International Linear Collider (ILC).
PMD/eentec is working on further improvements of the SP-500 characteristics, in particular, increasing its sensitivity and extending frequency response toward very long periods.

  • Immune To Magnetic Fields
  • Passband 0.01 Hz to 50 Hz
  • Sub-nanometer Resolution
  • No Mass Centering or Mass Locks
  • 130dB Dynamic Range
  • Rugged
  • Maintenance Free
  • Insensitive To Tilts
  • Flat Frequency Response
Operating principle: Electrochemical motion transducer with high damping coefficient
Output signals: 1 channel, velocity-flat response
Output signal swing: ±10V (±20 V p-p differential)
Dynamic Range: 130 dB @ 1Hz
Bandwidth: 0.1 – 50 Hz; Optional: 0.0167 – 75 Hz
Sensitivity 0.2nm•rt Hz @ 1 Hz
Generator constant: Standard: 2000 V/m/s; Opt.: 350 – 20,000 V/m/s
Mass Centering: NONE REQUIRED
Maximum installation tilt Fully operational at any random orientation
Mechanical resonance >200 Hz
BasicSP-500 Configuration One channel configuration includes mating connector and calibration sheets
Extended Low Period

option -L (0167 Hz)

Extended Period option -H (75 Hz)
Generator Constant option -G (specify from 350 V/m/s to 20,000 V/m/s
Recorder Options DR-4000,
Supplies and Accessories Sensor Cable
General Spares None

S Printer Friendly Format For Specifications

Dimensions 50 x 100 x 150 mm
Weight (Aluminum housing) ~0.75 kg
Connector 14-pin circular or customized
Waterproof: Submersible (1m)
Temperature range: Standard: -12 to + 55 C
Power - Standard 10 – 15 Vdc; 12 Vdc nominal
Supply current 8 mA

1 Tesla testing

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