Beam current measuring instrument and beam current measuring...

Radiant energy – With charged particle beam deflection or focussing – With detector

Reexamination Certificate

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C250S492210, C324S11700H

Reexamination Certificate

active

07619223

ABSTRACT:
The invention provides a nondestructive measuring method and measuring apparatus that assures a high noise immunity and is capable of performing high-accuracy beam current measurements. The inventive beam current measuring apparatus includes a magnetism shielding part for shielding an external magnetic field and a magnetic field sensor arranged in the shielding space generated by said magnetism shielding part, said beam current measuring apparatus measuring, by using said magnetic field sensor, a magnetic field where a beam current to be measured is generated, characterized in that said magnetic field sensor has a magnetic flux/feedback current conversion coefficient of 8×10−15Wb/A or above.

REFERENCES:
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patent: 6320369 (2001-11-01), Hidaka et al.
patent: 2001-91611 (2001-04-01), None
patent: 2003-21670 (2003-01-01), None
patent: 2003-31176 (2003-01-01), None
Grohmann et al., “A Cryodevice for Induction Monitoring of DC Electron or Ion Beams with Nano-Ampere Resolution”, Physikalisch-Technische Bundesanstalt, Berlin, Germany.
Hao et al., “Design and Performance of an HTS Current comparator for Charged-Particle-Beam Measurements”, IEE Transactions of Applied Superconductivity, vol. 11, No. 1, Mar. 2001.
Peters et al., “Review of the Experimental Results with a Cryogenic Current Comparator”, University of Jena, Germany.
Kuchnir et al., “Squid Based Beam Current Meter”, IEE Transactions on Magnetics, vol. MAG-21, No. 2, Mar. 1985.
Tanabe, “A Cryogenic Current-Measuring Device with Nano-Ampere Resolution at the Storage Ring TARN II”, Sep. 1998, pp. 455-464.
Hao et al., “HTS Flux Concentrator For Non-Invasive Sensing Of Charges Particle Beams”, Jun. 2001, pp. 469-470.

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