1 / 6

End-cap CALIFA Design

End-cap CALIFA Design. Trapezoidal Prisms. Different rings. Crystals in a ring. End-cap CALIFA. 1Phoswich crystal. GSI-R3B-13-16 April 2010. J.Sánchez del Río, C.Cruz,A.Perea,O.Tengblad. End-cap CALIFA Design. Triangular Prisms. 2.8 cm. 2 cm. Phoswich configuration. Q =2,5.

hector-hoffman
Télécharger la présentation

End-cap CALIFA Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. End-cap CALIFA Design Trapezoidal Prisms Different rings Crystals in a ring End-cap CALIFA 1Phoswich crystal GSI-R3B-13-16 April 2010 J.Sánchez del Río, C.Cruz,A.Perea,O.Tengblad

  2. End-cap CALIFA Design Triangular Prisms 2.8 cm 2 cm Phoswich configuration Q=2,5 End-cap CALIFA End-cap alveole 9 Phoswich crystals Characterisitcs of an alveole R=40 cm GSI-R3B-13-16 April 2010 J.Sánchez del Río, C.Cruz,A.Perea,O.Tengblad

  3. MPR16-B PA+bias with TEMP compensation for LAPD • 16 channel preamplifier with 16 channel individual bias supply. • The plug on bias module on MPR16 creates up to 600V individually regulated bias for avalanche Photo diodes or strip detectors. • A temperature sensor can be connected and allows the MPR16-B to compensate • the APD gain drift with temperature by adapting the bias voltage with temperature. • The temperature compensation slope can be adjusted positive or negative and within a wide range. • Temperature compensation • The sensor can be connected at the SubD25 input connector. • Sensor type: NTC thermistor, Epcos B57861-S502-F40 (5kOhm @ 25°C, B = 3988) • Offset slope adjustment (via RC): • Slope parameter = 0: voltage is decreased by 2.5V / °C • Slope parameter = 128: slope about 0 • Slope parameter = 255: voltage is increased by +2.5V / °C • So for the MPR16-B-P device (positive bias voltage) the theoretical slope parameter • setting for LAAPDs (0.7V/°C) is 128 + 36 = 164; GSI-R3B-13-16 April 2010 J.Sánchez del Río, C.Cruz,A.Perea,O.Tengblad

  4. Experimental set-up to evaluate the number of e-h pairs created by a LED pulse, related to a well-known Fe-55 source.

  5. LAAPD’s Dynamic range • The APD gain was kept at 50, where the S/N ratio is optimal. • The dynamic range is actually limited by the Mesytec preamp.

  6. How to cope with the huge Dynamic range Howtochain The Fast Signal output can be used to select the attenuation well before the analog signal arrives to the digitizer via the amplifier. Like this, one can get available the full range of the preamp (~2500), from small signals around 40 keV up to 100 MeV, keeping the APD gain @50

More Related