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Electro-optical measurements of picosecond bunch length of a 45 MeV electron beam (2001)

Tsang, T. ; Castillo, V. ; Larsen, R. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 4921-4926

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: We have measured the temporal duration of 45 MeV picosecond electron beam bunches using a noninvasive electro-optical (EO) technique. The amplitude of the EO modulation was found to increase linearly with electron beam charge and decrease inversely with distance from the electron beam. The rise time of the temporal signal was limited by our detection system to ∼70 ps. The EO signal due to ionization caused by the electrons traversing the EO crystal was also observed. It has a distinctively long decay time constant and signal polarity opposite to that due to the field induced by the electron beam. The electro-optical technique may be ideal for the measurement of bunch length of femtosecond, relativistic, high energy, charged, particle beams. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1358322

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Parasagittal Solitary Fibrous Tumor of the Meninges. Case Report and Review of the Literature (1999)

Nikas, D. C. ; De Girolami, U. ; Folkerth, R. D. ; [et al.]

Springer

Acta neurochirurgica 141 (1999), S. 307-313

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ISSN: 0942-0940

Keywords: Keywords: Solitary fibrous tumor; CD 34; fibrous meningioma; spindle-cell neoplasm.

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The clinical, radiologic and pathologic features of a case of parasagittal solitary fibrous tumor of the meninges are reported. The patient was a 44 year-old male who presented with a complex partial seizure and a history of headaches and confusion. Radiological studies showed a large extra-axial dural-based mass in the right parietal region, predominantly isointense with gray matter and hypointense with respect to white matter on T1-weighted images, and hypointense with respect to gray matter on T2-weighted images. At surgery, the mass was very vascular, quite firm and very adherent to the convexity. Histologically the tumor was composed of spindle-shaped cells growing in fascicles within a collagenous matrix. Solitary fibrous tumor of the meninges is a newly described entity, which should be kept in mind in the clinical and radiological differential diagnosis of extra-axial brain tumors.