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TEXONO: Status and Plans Nov 2002

TEXONO: Status and Plans Nov 2002. KS Period I Analysis 4514/1224 hours of ON/OFF data Magnetic moment analysis completed (LHB) Electron neutrino flux(completed) + analysis(50%) (XB) Inclusive analysis on anomalous neutrino interactions --discussions so far …… (LST ….)

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TEXONO: Status and Plans Nov 2002

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  1. TEXONO: Status and Plans Nov 2002 KS Period I Analysis 4514/1224 hours of ON/OFF data Magnetic moment analysis completed (LHB) Electron neutrino flux(completed) + analysis(50%) (XB) Inclusive analysis on anomalous neutrino interactions --discussions so far …… (LST ….) Nuclear interaction searches – data preparation (LST …..) KS Period II Preparation 186 kg of CsI(Tl) in place (VS) Improved HPGe with shieldings completed (LJ,…….) Electronics upgrade modules completed (NJ) New DAQ+Trigger being installed (LHB,CKC….) New offline software framework being developed (LDZ,LHB…..) Goals : improved HPGe mn, CsI: SM s(ne) WTK Nov 2002

  2. KS/P1 Analysis • HPGe :exploit the low threshold data • Established Problem: mn and Gn for ne via : ne + e nx + e • Speculative Analysis: ※study ne flux from reactor  due to neutron excitation producing e.g. 51Cr, 55Fe [distinct energy & timing …..]  studymn & Gn for ne ※anomalous Neutrino Interactions in Matter e.g.anomalous energy deposition X (>eV) ne + N  nx + N + X [similar analysis as accelerator nm] ※study possible nuclear transitions e.g.73Ge* decays by 2g’s separated by t1/2=4.6 ms CsI(Tl) :TechnicalRun • Event Reconstruction • Background Studies • Optimize for P2

  3. Kuo Sheng Reactor Neutrino Laboratory Front Gate Front View (cosmic vetos, shieldings, control room …..) Inner Target Volume

  4. KS Expt. : Period I Configuration Period I : June 01 – April 02 (60 days OFF) Shielding & Veto [one side] ULB-HPGe + Anti-Comptons CsI(Tl) Array (46 kg)

  5. KS Expt: Period I Detectors ULB-HPGe [1 kg] CsI(Tl) [46 kg] FADC Readout [16 ch., 20 MHz, 8 bit] Multi-Disks Array [600 Gb]

  6. Selected Photos – Period II Installation – HPGe

  7. Selected Photos – Period II Installation – CsI(Tl) Array

  8. CsI(Tl) Event Reconstruction • Making progress, single module [E,Z] OK (LDZ,….) • Amp=255 pulse reconstruction : algorithms completed, applied to real event (YQ,LDZ….) • Feedback to PMT/threshold optimization (LDZ, LFS….) • R&D Projects • LEPS/SPring8 FADC upgrade completed [40 MHz, 10 bits, 32 channels, +FPGA]; next: integrate to TEXONO system (AS) • Studying “Low Energy HPGe”, 5 g mass, aim 200-300 eV threshold, possible nN coherent scatterings (AS) • Prepare AMS run for K-40 in CsI/liquid scin. measurements in 2003 (CIAE) • Initate project on Sono-Luminescence (AS)

  9. FADC Upgrade for SPring8KS • 40 MHz ; 12 bit ; 32 ch/module @ 9 U VME [ c/f KS FADC : 20 MHz ; 8 bit ; 16 ch/module ] • On-board processing with FPGA • 1000 channels to be used in TPC in LEPS Expt. @ SPring8 by End 2002. TPC for LEPS @ SPring8 Mixed signal FADC Adapter Board • 40 MHz sampling rate. • 10 bits resolution with 2Vp-p dynamic range. • Clock distribution with Phase Lock Loop circuit. • On Board digital signal delay and • Real-Time ZERO-Suppression. • High capacity First In First Out Memory. • Easy to use with high density connector. Prototype Measurements :

  10. Reactor Neutrino Interaction Cross-Sections P2: SM (ne) > 2 MeV P1: MM (ne) 1-100 keV P3+: Coh. (nN) < 1 keV

  11. Publications • CsI(Tl) prototype paper, appears in NIM (LY…) • Dark Matter neutron measurement, appears in PLB (WMZ…) • Magnetic moment results, completed and submit soon to PRL (LHB,……) • Saturated event correction, in prep. for NIM (YQ……) • Low energy PSD, in prep. for NIM (WCS,YQ…) • reactor ne flux & P1 constraints, for PLB or PRL (XB …..) • Collaborators • Li HB : Ph.D. , July 02 [P1 magnet moment analysis] • Chen CP : Associate Prof. at Peking U., Sept 02 • Lin ST : join as grad. student, NTU, Sept 02 • Yue Q : Ph.D., expect Jan 03 [Dark Matter etc…] • Xin B : Ph.D., expect July 03 [reactor ne flux, P1 data] NEED to identify/prepare new students !!

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