The R 3 B CALIFA Endcap Design and expected performance Roman Gernhäuser Physik-Department E12, Technische Universität München CALIFA Working Group USC-IEM-UVigo GSI-TUM Chalmers JINR - NRC CFNUL EMMI-TUD Lund Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 1
FAIR Facility for Anti-proton and Ion Research SIS 100/300 S-FRS R 3 B Outline: • Introduction – R 3 B, CALIFA – (p,2p) scattering as an example • Phoswich detectors • iPhos technique • Expected performance Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 2
R 3 B Reactions with Relativistic, Radioactive Beams Wed 12:25 Roy Lemmon Thu 11:55 Konstanze Boretzky Thu 12:20 Anatoly Krivshich Fri 11:10 Thomas Aumann Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 3
Quasi-free scattering of exotic nuclei Experiment in inverse kinematics Nucleus excited fragment evaporated A p,n,d,t,... A-1 q photon(s ) ~700 AMeV bound proton 2 transfer momentum q interner Impuls Separationsenergie q p p p p S E * T ( T T T ) scattered protons : 0 A A 1 1 2 p A 1 2 A 1 • back-to-back • opening angle 80 ° 1 free target proton Requirements for CALIFA: • high dynamic range 100keV γ -rays – 700 AMeV charged particles • high efficiency • high granularity -> Doppler correction • particle identification Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 4
CALIFA Barrel & Forward Endcap Array CALorimeter for In Flight detection of g -rays and charged pArticles. 700 AMeV large solid angle maximum efficiency good resolution easy access to target area Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 5
The Combined Concept IPHOS Intrinsic Phoswich Detectors CEPA Califa Endcap Phoswich Array D E -> E separate reactions QFS @ 700AMeV eff. length limit 22cm: 15% • geometrical space, .. • light collection • crystal properties 50% • efficiency and cost Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 6
Segmentation and Doppler Broadening E P = 400 AMeV E P = 700 AMeV DQ ( ° ) DQ ( ° ) 6% 6% 2% 2% CEPA IPHOS Q ( ° ) Q ( ° ) balance : • doppler broadening • rate /mult. capability • intrinsic resolution • calorimetric properties • costs • ….. Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 7
CEPA - the Phoswich Part 2 scintillators 1 readout optical comp. • high rate capability • best resolution • high light yield • depth information redundant D E for particles • D E/E Light yield Decay Materials (% at 662 (photons/ λ emision time (ns) keV ) keV) LaBr 3 2.9 63 16 380 nm LaCl 3 3.8 49 28 350 nm 8 Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 8
CEPA4: a bigger phoswich array counts 60mm 40mm LaCl 3 LaBr 3 2 crystals with (I long -I short )/I long different light yield & different decay time with common readout VME CAEN Flash ADC (V1742) to digitize the signals total amplitude Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 9
Reconstruct Proton Energy CEPA4 (10cm) Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 10
IPHOS - CsI(Tl) CEPA IPHOS Intrinsic Phoswich array Particle identification in CsI(Tl) using digital pulse shape analysis – W. Skulski, M. Momayezi, NIM A 458, (2001) 759-771 Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 11
RPID particle identification t t' t' t t ' [F [F exp( ) S exp( )] )] U - - exp( ) dt ' ADC τ τ f s Pream 0 MWD Differentiation 1 t exp( ) - τ s S MWD F S M. Bendel, RG, EPJA 63, (2013) Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 12
p( 12 C,X) p‘ @ 80 AMeV (LNS, Catania, Italy) PID with CsI(Tl) Nf / Ns depends on the ionization density? Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 13
474 MeV Protons @ TRIUMF N red (a.u.) N f (a.u.) 150mm Beam Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 14
Select Reactions N red (a.u.) Protons @500MeV 50% reactions (25cm) large background low (p, 2p) efficiency N f (a.u.) Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 15
GSI FEBEX Readout FEBEX3B: • ADC, 16 ch, 14 Bit, 50 MHz • Lattice ECP3 150 FPGA • Timestamp synchronization • Programmable via GOSIP FAB_ Addon: • Digital to Analog converter for programmable baseline offset • 25 MHz Bessel Nyquist filter Preamp ADC Filter DAC FPGA Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 16
Add On Boards Digital Pulse Generator ADC channel • 210 MS/s, 14 bit DAC • 2-pole low-pass filter • 8 channel analog multiplexer • CsI(Tl) pulse form with adjustable PID • controlled via USB or GOSIP Time (20 ns) • generates DAQ trigger and SC event SCA Add-On Board DRS4 • Switched capacitor array Preamp ADC Filter (analog ringbuffer) • PSI DRS4: Up to 5 GHz sampling 33 MHz read out rate DAC FPGA FPGA Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 17
Photopeak Efficiency Endcap Califa Barrel + Endcap Sum all detectors ▲ Photon reconstruction corrected for geo acceptance Barrel coulex Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 18
Energy Resolution Barrel Endcap = 0.82, projectile frame perfect detectors 5% CsI(Tl) resolution 6% CsI(Tl) resolution @ 1MeV Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 19
g -ray Spectroscopy One Neutron Knockout from 23 O Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 20
18 O(p,2p) 17 N Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 21
Summary & Outlook • Very good efficiency up to 15MeV • 6% resolution above 1MeV • iPhos method for reconstruction of high energy particles proven • CEPA Demonstator successfully tested • TDR for the CALIFA Endcap handed in Nov. 2014 • start construction in 2015 • setup and commissioning 2017 • day-0 experiments in 2018 Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 22
Thank you very much for your attention CALIFA Working Group USC-IEM-UVigo GSI-TUM Chalmers JINR - NRC CFNUL EMMI-TUD Lund Roman Gernhäuser The CALIFA Endcap – NUSTAR week March 2015 – GSI 23
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