Status and perspectives of the LNS-FRIBS facility 1 19/05/2019 13:40 Status and perspectives of the LNS-FRIBS facility P. Russotto, INFN-LNS, Catania, Italy and NewCHIM collaborations 5/19/2019 1:40 PM

Fragmentation beams at INFN-LNS - Catania 19/05/2019 13:40 Reaction target and fragments detection Two 45° dipoles of the beam line for the fragments selection Movable production Target water cooled G. Cardella at HIB@LNS 2015

Tagging system: layout of the CHIMERA case DSSSD ~ 140 μm (32x32 pixels of 2*2 mm2) Micro Channel Plate as start detector Δt~200 ps Position sensitive PPAC or DSSSD to measure/test trajectory G. Cardella at HIB@LNS 2015

Tagging system: particle identification strip MCP MeV ns Same time = same v Br=mv/q  same m/q or for fully stripped ions Same m/Z m/Z=3 18O(55 AMeV) + 9Be(1500 um) Br=2.78Tm m/Z=2.66 16C 8Li 6He 9Li 12Be 15B 18C Beams produced available at https://www.lns.infn.it/it/acceleratori/fribs-lns.html Smaller time larger v  smaller m G. Cardella at HIB@LNS 2015

Beam diagnostics There are 13 diagnostic points to optimize the transport of the beam. Real time beam imaging based on fast acquisition system Spatial resolution 1-2 mm Plastic scintillator (BC408) optically coupled to a small PMT, working in pulse counting mode (good below 105 pps) G. Cosentino & E.V. Pagano at HIB@LNS 2015

G. Cardella (IWM-EC 2016) & N.S. Martorana (SiF 2016) PIGMY @ LNS G. Cardella (IWM-EC 2016) & N.S. Martorana (SiF 2016) 68Ni 67Ni 65Co 68Cu 69Cu 71Zn Obtained statistics: 2 ·10 9 events of 68Ni 6 ·10 9 total events 70Zn(40 AMeV) + 9Be In the previous proposal we required: 30 BTU ( 10 days) of beam in order to study the PDR on 68Ni 70Zn @ 40 MeV/nucleon with a power of 100 W ( 20 KHz of 68Ni)beam intensity of 700 nA 6 BTU for the calibration  p+12C and Kr beam 68Ni 67Ni Good identification also thanks to the cleaning effect of the fragment separator We actually obtained ( 25/11/2015- 9/12/2015): Just 400 nA of 70Zn Problems to maintain the source for a long period ( problems with the transport and the transmission of the beam) we actually had 15 BTU of 70Zn despite the renouncement of the Kr beam Proton calibration √ FARCOS detects and identify 68Ni with good energy resolution (stopped in the two silicon stages of the telescopes) G.Cardella IWMEC 2016

New exp CLIR in JUNE 2015: CHIMERA+FARCOS Clustering phenomena in exotic nuclei: structure MeV ns New exp CLIR in JUNE 2015: CHIMERA+FARCOS D. Dell’Aquila et al., PRC 93 024611 (2016)

The GREEN Experiment: Measure of the ISGMR in the 38S exotic nucleus Primary 40Ar beam @ 35 AMeV (100 W) on a 9Be production target 500 μm thick How… Deuteron inelastic scattering in inverse kinematics CD2 target 1 mg/cm2 thick Beam 38S @ 21 AMeV 38S excitation energy spectrum and angular distributions The recoiling deuteron is measured at small angles around 0° in MAGNEX Complete reconstruction of the deuteron momentum vector

Actual LNS Layout The proposed new FRIBs area con and pro: PRO It is outside from the accelerators room/vault; It is easier to shield this area; It is a completely new beam line (the pro is that the performance are optimized by the new design); The construction is quite independent by the usual activity of cyclotron; CON We lose 2 experimental tandem area, but may be 0ne will be recovered. The cost; MAGNEX CHIMERA CICLOPE A.D. Russo at SIF 2016

The FRIBs layout towards CHIMERA & MAGNEX The FRIBs layout to deliver radioactive beam to MAGNEX and CHIMERA rooms Output Slit The new FRIBs solution consists in: Degrader 2 - triplets 2 – doublets Bore ø 140 mm 2 - 70° dipoles 2 - 40° dipole R=2000 mm H=±200 mm V=±35 mm Target where fragmentation occurs A.D. Russo at SIF 2016

The FRIBs layout towards CICLOPE & SOLE The FRIBs layout to deliver radioactive Ion beam to CICLOPE area and SOLE spectrometer The line at the beginning is the same then previous; To build this line it is necessary to add Output Slit 2 – triplets 1 – doublet Bore ø 140 mm Degrader R=2000 mm H=±200 mm V=±35 mm 1 - 45° dipole It is necessary to add a -5° exit to the first 40° dipole Target where fragmentation occurs A.D. Russo at SIF 2016

A case study: 14Be production @55 AMev Pbeam= 2kW Projectile beam: 𝟏𝟖 𝑶 𝟖+ Target: 𝟗𝑩𝒆 1500 μm Fragment required 𝟏𝟒 𝑩𝒆 𝟒+ Output slit New and actual systems Comparison @ 100 W With and without slit comparison @ 2 kW 3.88E+03 3.78E+03 Out particle [pps] factor Actual 5.68E+01 New@100 W 1.94E+02 ≅4 New@2 kW 3.88E+03 ≅80 A.D. Russo at SIF 2016

Other issues: Beam tagging: see C. Nociforo talk at HIB@LNS 2015 Beam diagnostics: see E.V. Pagano talk at HIB@LNS 2015