In-beam tests of an air-core superconducting-solenoid particle spectrometer
We have assembled and tested a moderately sized air-core superconducting solenoid spectrometer. The spectrometer solid angle is defined by one of five interchangeable apertures of various shapes and sizes and a small Faraday cup (..delta..theta = +-4/sup 0/), located inside the scattering chamber, which can be removed to include smaller angles. Initial testing was done using an ..cap alpha.. source with a solid state detector at the focal point. In-beam tests were subsequently performed at the ANL superconducting linac. One set of tests consisted of a series of exposures of ca. 8x8 cm plastic track detectors (CRONAR) located at the focal plane and centered on the mechanical axis. Small-angle elastic scattering of /sup 32/S+Au (E = 90 MeV) and /sup 16/O+Au (E = 76 MeV) was imaged on the detectors with various fields and entrance apertures, to study focusing properties and aberrations. The track detectors were suitably etched and the track density digitized using a CCD camera. The actual focal point is displaced lightly (approx. 1 cm) from the mechanical center, and there is an azimuthal dependence in the aberrations which is not completely understood. A more complete set of measurements was taken using an XY-..delta..E-E-TOF detector. This detector consisted of two separate 1 cm-thick charge-division proportional counters with 20 ..mu..m quartz-carbon wires oriented along the X and Y axes. These were backed (in gas) by a 100 ..mu..m thick, 600 mm/sup 2/ silicon surface-barrier (SiSB) detector for E and TOF. The beam was tuned for a pulse width less than or equal to 250 psec with 20 nsec between pulses. A fast time pickoff on the SiSB detector yielded particle TOF with a resolution approx. 450 psec, which was limited by the SiSB detector size and quality. Thus this system can, in principle, provide complete particle identification with a mass resolution approx. 1/100.
- Research Organization:
- Michigan Univ., Ann Arbor (USA). Dept. of Physics; Argonne National Lab., IL (USA); Notre Dame Univ., IN (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6022292
- Report Number(s):
- CONF-841005-3; ON: DE85004029
- Resource Relation:
- Conference: Instrumentation for heavy ion nuclear research conference, Oak Ridge, TN, USA, 22 Oct 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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