The basic concept for the NPS is a highly segmented EM calorimeter based on PbWO 4 preceded by a compact sweeping magnet

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1 The Neutral-Particle Spectrmeter (NPS) The NPS is envisined as a facility in Hall C, utilizing the well-understd HMS and the SHMS infrastructure, t allw fr precisin (cincidence) crss sectin measurements f neutral particles (g and p 0 ). The basic cncept fr the NPS is a highly segmented EM calrimeter based n PbWO 4 preceded by a cmpact sweeping magnet NPS cantelevered ff SHMS platfrm NPS n SHMS platfrm Magnet Detectr Detectr Magnet NPS angle range: degrees NPS angle range: degrees The NPS will be remtely rtatable ff the SHMS platfrm.

2 NPS Cllabratin 30 April 2015 I. Albayrak, J. R.M. Annand, A. Asaturyan, M. Ber, A. Camsnne, M. Carmigntt, D. Day, D. Dutta, R. Ent, M. Guidal, D.J. Hamiltn, N. Hlavin, T. Hrn, C. Hyde, H. Mkrtchyan, D. Keller, C. Keppel, F. Klein, A. Mkrtchyan, C. Munz-Camach, P. Nadel-Turnski, R. Paremuzyan, H. Rashad, J. Rche, O. Rndn, I. Sapkta, S. Sirca, V. Tadevsyan, B. Wjtsekhwski, S. Wd, S. Zhamkchyan, J. Zhang, C. Zrn A.I. Alikhanyan Natinal Science Labratry/Yerevan, Cathlic Univ. f America/USA, Institut de Physique Nucleaire d Orsay/France, Mississippi State Univ./USA, Jeffersn Labratry/USA, Ohi University/USA, Old Dminin Univ./USA, Univ. f Glasgw/Sctland, Univ. Ljubljana, Univ. f Virginia/USA

3 Overview Scientific Prgram 5 experiments apprved by PAC (40, 42) t date E : Measurement f Semi-inclusive p 0 prductin as Validatin f Factrizatin E Exclusive Deeply Virtual Cmptn and p 0 Crss Sectin Measurements in Hall C E Wide-angle Cmptn Scattering at 8 and 10 GeV Phtn Energies E Wide Angle Exclusive Phtprductin f p 0 Mesns E Initial State Helicity Crrelatin in Wide-Angle Cmptn Scattering 1 LOI and ne prpsal submitted t PAC43 LOI Timelike Cmptn Scattering with transverse target PR12-15-XXX Duble Plarizatin Observables in WACS at Phtn Energies up t 8 GeV Ideas exist fr future experiments and new scientific directins taking advantage f the cmpatibility f NPS with Hall infrastructure DVCS with plarized targets Pssibilities fr crrelatin experiments

4 EXP. NO. Hall Title Spkespersns Institutins Beam Days Rating PAC Run Grup E C Measurement f Semi-Inclusive p Prductin as Validatin f Factrizatin E C Exclusive Deeply Virtual Cmptn and Neutral Pin Crss-Sectin Measurements in Hall C E C Wide-angle Cmptn Scattering at 8 and 10 GeV Phtn Energies E C Wide Angle Exclusive Phtprductin f p Mesns E C Initial State Helicity Crrelatin in Wide-Angle Cmptn Scattering R. Ent JLab 25 A- 40 A T. Hrn CUA H. Mkrtchyan Yerevan V. Tadevsyan Yerevan C. Munz Camach IPN Orsay 53 A 40 A R. Paremuzyan IPN Orsay T. Hrn CUA C. Hyde ODU J. Rche Ohi U B. Wjtsekhwski JLab 18 A- 42 B D. Hamiltn Glasgw S. Sirca Ljubljana D. Dutta Miss. State 18 B 42 B M. Amaryan ODU H. Ga Duke M. Kunkel ODU S. Sirca Ljubljana I. Strakvsky GWU D. Keller UVa 15 B 42 C D. Day UVa J. Zhang UVa Apprved PAC days 129 Run Grup days 86

5 PROP. NO. Hall Title Spkespersns Institutins Beam Days LOI C Timelike Cmptn Scattering with transverse target E12-15-XXX A Duble Plarizatin Observables in WACS Rating PAC Run Grup A. Mkrtchyan CUA 43 M. Ber IPN Orsay V. Tadevsyan Yerevan P. Nadel-Turnski JLab B. Wjtsekhwski JLab 43 S. Abrahamyan Yerevan G. Niculescu JMU

6 NPS status Glbal design has been frzen fr last three years and reviewed well In the ideal case wuld use new PbWO 4 crystals See slides by R. Nvtny Glbal availability f high quality crystals needs t be taken int accunt Taking advantage f existing PbWO 4 crystals frm HyCAL, ne arrangement is in a 36x30 matrix cvering 25 msr at distance f 4 m frm target (~1100 crystals) Culd use PbF 2 crystals frm DVCS/Hall A t fill ut slid angle Nte: TCS experiment wuld require additinal crystals and detectrs (tracker, recil) Studies related t PbWO 4 crystals 10+5 PbWO4 crystals prduced by SIC have been tested fr ptical prperties and radiatin hardness; 30 mre crystals were rdered frm SIC in 2015 Infrastructure fr crystal testing at universities See slides by C. Munz-Camach See slides by M. Carmigntt 2015 NSF/MRI funding applicatin submitted (CUA, OU, ODU, JLAB, Yerevan) Additinal funding applicatin with emphasis n WACS requirements in preparatin

7 Gals f this meeting Overview f the glbal status n PbWO 4 crystals Summary f tests f systematic and radiatin damage effects f 2014 prduced SIC crystals Irradiatin studies with beam at Idah Acceleratr Facility Optical prperties and light yield Cmparisn t results frm BNL, Caltech, and Giessen Overview f facilities fr crystal testing at universities IPN-Orsay CUA Discussin f what tests we shuld d t fully understand crystal quality Discussin f pssible ptins fr NPS PbWO 4 crystals

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