Author: Mutti, P.
Paper Title Page
WEPGF083 Single Neutron Counting Using CCD and CMOS Cameras 889
 
  • P. Mutti, M. Plaz, E. Ruiz-Martinez, P. Van Esch
    ILL, Grenoble, France
  • M. Crisanti
    Università degli di Perugia, Perugia, Italy
  
  Neu­tron de­tec­tion tra­di­tion­ally takes place with de­tec­tors based upon par­ti­cle de­tec­tion tech­nolo­gies like gas or scin­til­la­tion de­tec­tions. These de­tec­tors have a high dy­namic range, and are very per­form­ing at low count­ing rates and fast tim­ing (time of flight) ap­pli­ca­tions. At high count­ing rates how­ever, con­tin­u­ous imag­ing de­tec­tors such as CCD or CMOS cam­era's op­ti­cally linked to scin­til­la­tors, can have very good per­for­mances con­cern­ing lin­ear­ity and spa­tial res­o­lu­tion but the dy­namic range of these sys­tems is lim­ited by noise and gamma back­ground. We ex­plore a tech­nique that al­lows us to use imag­ing de­tec­tors as count­ing de­tec­tors at lower count­ing rates, and tran­sits smoothly to con­tin­u­ous imag­ing at higher rates. Neu­tron de­tec­tion in­volves re­ac­tions re­leas­ing en­er­gies of the order of the MeV, while X-ray de­tec­tion re­leases en­er­gies of the order of the pho­ton en­ergy, (10 KeV range). This 100-fold higher en­ergy al­lows the in­di­vid­ual neu­tron de­tec­tion light sig­nal to be sig­nif­i­cantly above the noise level, as such al­low­ing for dis­crim­i­na­tion and in­di­vid­ual count­ing. The the­ory is next con­fronted with ex­per­i­men­tal mea­sure­ments on CCD and CMOS type com­mer­cial cam­eras.  
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WEPGF084 New Digitisers for Position Sensitive 3He Proportional Counters 893
 
  • P. Mutti, M. Plaz, E. Ruiz-Martinez, P. Van Esch
    ILL, Grenoble, France
  
  3He gas-filled de­tec­tors are a clas­si­cal choice for the de­tec­tion of ther­mal and cold neu­trons. The in­ci­dent neu­trons are cap­tured by the 3He pro­duc­ing a tri­tium and an hy­dro­gen which are shar­ing the 765 keV of en­ergy gen­er­ated in the re­ac­tion. The clas­si­cal geom­e­try of a charge-di­vi­sion neu­tron de­tec­tor con­sists of a cylin­dri­cal vol­ume hous­ing a re­sis­tive anode. Elec­tri­cal sig­nals are ex­tracted at both ends of the tube and the in­for­ma­tion about the in­ter­ac­tion point along the tube can be de­rived from the ratio of the col­lected charged at both ends. The clas­si­cal ana­log ap­proach for the charge read­out con­sists of a shap­ing am­pli­fier cou­pled with a peak sens­ing ADC. The de­vel­op­ment of a new dig­i­tal front-end elec­tron­ics based on 64 chan­nels, 62.5 Msam­ple/s and 12 bit digi­tis­ers, is re­ported on. Ex­cel­lent re­sults have been ob­tained in terms of po­si­tion res­o­lu­tion and sig­nal to noise ratio when adopt­ing a con­tin­u­ous dig­i­tal fil­ter­ing and gauss­ian shap­ing.  
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THHB3O02 Real-Time Data Reduction Integrated into Instrument Control Software 1115
 
  • P. Mutti, F. Cecillon, C. Cocho, A. Elaazzouzi, Y. Le Goc, J. Locatelli, H. Ortiz
    ILL, Grenoble, France
  
  The in­creas­ing com­plex­ity of the ex­per­i­men­tal ac­tiv­ity and the grow­ing raw dataset col­lected dur­ing the mea­sure­ments pushed the in­te­gra­tion of the data re­duc­tion soft­ware within the in­stru­ment con­trol. On-line raw data re­duc­tion al­lows users to take in­stant de­ci­sions based on the phys­i­cal quan­ti­ties they are look­ing for. In such a way, beam time is op­ti­mised avoid­ing over­sam­pling. More­over, the datasets are more con­sis­tent and the re­duc­tion pro­ce­dure, be­com­ing now part of the se­quencer work­flow, is well doc­u­mented and can be saved for fu­ture use. A server and a client API that al­lows start­ing and mon­i­tor­ing the re­duc­tion pro­ce­dures on re­mote ma­chines and fi­nally get their re­sults, was de­signed. The im­ple­men­ta­tion of the on-line data re­duc­tion on sev­eral in­stru­ments at the ILL as well as on the ob­tained per­for­mances, will be re­ported in this paper.  
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