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Progress Report on E-EMC Developments and Calibration Goals for Run 3 at STAR

This report summarizes the current status of the E-EMC developments, calibration processes, and goals for Run 3 of the STAR experiment held at BNL from October 22-24. Key areas include the detector status, incident particle detection strategies, calibration methods for towers, and software developments aimed at improving spin analysis and inclusive jet production. Enhanced statistical precision and readiness for commissioning essential components like the spin rotators are highlighted as priorities, alongside ongoing calibration efforts and software integration for effective data acquisition.

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Progress Report on E-EMC Developments and Calibration Goals for Run 3 at STAR

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  1. E-EMC developments and plan • Detector status • Run 3 goals • Calibration • Software status Jan Balewski IUCF, Indiana STAR Analysis Meeting BNL, October 22-24

  2. =2.0 =1.06 EEMC half is on the STAR poletip http://www.iucf.indiana.edu/STAR/eemc_proj

  3. EEMC Instrumentation in Run 3 1 2 3 4 5 6 SMD 7 8 9 10 … 24 Layer: • 4 sector of towers on day 1 • 1 sector of pre/post/smd on day N Incident particles 1 … 12 8 5 7 6 PMT tower MAPMT Pre1,2,Post MAPMT SMD strips

  4. Layer 1 U V V U U Layer 2 V V U V Layer 3 U U V Designed for  0 / identification SMD layout for EEMC 8 5 7 U-plane 288 strips 6 overlap

  5.  • Extend search for transverse spin asymmetries at both high and mid-, with much improved statistical precision (40 in P2L ) • Begin measurements of ALL for inclusive jet production  first hint of G • Investigate spin sensitivity of L monitor for ALL • Commission spin rotators (need monitor process with AT  0 and significant rate) • Commission EEMC Goals for FY03 p-p Run

  6. Talk (Vigdor) at Trigger workshop 5/02 LBNL • http://www.iucf.indiana.edu/U/STAR/eemc_proj/electr_trig_daq/pp_trigger_2003.ppt Jet Triggering in STAR Anticipated jet yield for 3 pb-1, for EMC jet patch trigger:  ET > 6 GeV over =1.0  =1.0 patch

  7. Inclusive  0 near mid-rapidity with EMC high-tower trigger SMD response to  0 real FPD events, G.Raknees M-C 10-day FY03

  8. EEMC in Run 3 • Run time calibrations (10% gain matching) • cosmic ray and source scan @ IUCF • ratio source/MIP response known for 60 towers (done) • rescan with source 4 sectors at WAH with new PMTs (planned) • set HV to ET=60 GeV for all 4*60 PMT’s (planned) • Final calibrations • Towers in 4 sectors: (goal is 2% ) • PIM @ 0.3 GeV (absolute) • pi0 in separated towers ~few GeV (absolute) • + up to ~10 GeV (absolute) • laser 0-150 GeV (relative) • SMD in 1 sector (goal is 10%, if electronic available) • source & cosmic for ~30% of strips in sector 6 (done) • MIP, pi0 …. • Triggers in Run 3 assumes 10% gain matching for towers • high tower ET >5 GeV (E+B) • jet patches ET >6 GeV (E+B) • laser calibration

  9. Source Scan @ IUCF (Renee Fatemi) Speed =0.5 or 1 cm/min , Rate= 10Keve/min Random trigger response of 12 TOWERS , sub-sector B (300 uC, Cobalt) B C D E A 11+12 9+10 signal 7+8 Tower ID 5+6 3+4 1+2 ADC 1

  10. Source Scan @ IUCF (Renee Fatemi) Speed =0.5 or 1 cm/min , Rate= 10Keve/min Random trigger response of one SMD strip Single p.e. Fit Results Single p.e. HV=1100V Source close to strip Source - background Background

  11. EEMC software (all work in progress) • Actual EEMC in CVS (almost) • Details, examples at http://www.star.bnl.gov/STAR/eemc/ • Simulation of Trigger response • Slow control • Calibration DB • Calibration code  • DAQ StEvent  • Hit/ raw histo display  • Tracking: >1.5, matching  • Cluster finder/ PID  • M-C : slow simulator  Legend:  service job • EEMC needed not only for spin physics ! • Help in software development from whole STAR appreciated • List of service jobs http://www.star.bnl.gov/STAR/eemc/ soft

  12. Key software for ppSPIN+EEMC (1) Non-spin utilities • BEMC Calibration • *we relay on its existence • EEMC Calibration • towers code (MIP*, 0* 2towers , +,W) {1+1+1+3} † • SMD code ( MIP, 0 ) {1+2, Les, Bernd} † • *determine new HV code  DB {Renee ?} • interface to MiniDAQ {0.5 once it runs} • generate calibration values • Towers* {6 }† • Use source calibration from IUCF to setup* max gain at ET=60GeV {1 Renee} • cosmic/collisions • SMD {6}† • EEMC DB • *DB I/O code {3, J+P} † • *fill+test DB {0.5} • Tracking • at >1.5 (ITTF seed finder} {2}  • track matching: towers,SMD {1}  • infrastructure • *add EEMC to StEvent* +MuDst* {1 } †  • *archive DB : EEMC & spin {0.1 for Jeff } • *DAQ event reader (‘copy’ of BEMC) {0.5}  • EEMC graphics (primitive) • *eve-by-even hits {2, J+Paul N.} † • *(un)conditional simple histo {2} †  • DB content : gains HV {2}  • Simulate of response for FY03 • *off-line code emulating trigger { 2, Renee} • *run MC to get trigger response {1, Renee} • *MC evaluate trigger bias for q-jets vs g-jets {1, Renee} • evaluate trigger bias for ALL‡ {0.5}  • run minb MC to get tower MIP response {0.5}  • *L2 code for ‘rotating jet patch’ {1 @BNL, Renee} • L3 code for pileup {1 @BNL}, J+P+L3 • tests, for use in run-4 • Tower slow simulator {6}  • SMD slow simulator {6}  • Legend: • * needed for FY03 run • { time in months} • J+P = Jan+Piotr • † - some code exist • ‡ assuming above is done •  service job

  13. Key software for ppSPIN+EEMC (2) Non-spin analysis spin analysis • Hit & Event reconstruction B+E EMC • *vertex finder with pileup {3, Jon G.} †  • *add SVT + B/E-EMC to vertex {12}  • *test off-line pileup rejection {3 } †  • *tower cluster finder • (use non-segmented EEMC) {3} †  • * reco  energy, isolated towers {3 } †  • 0 / / hadron disc. Towers {6 } †  • reco  energy , charge subtracted {3 } ‡ †  • 0 / disc. SMD {3} †  • TPC jet reco* {Akio, Konstantin} † • TPC*+B*/E-EMC jet reco {1 year }  • reco  +jet kin. {1 } ‡ • reco W {3}  • other analysis • Run time spin DB • *accommodate new CNI results  • discard bunches, … • upgrade* daemons {0.5 P} † • update display {0.5 , Joanna ?} †  vertex • Spin related software • quantization axis for 2-jet events {1}  • incorporate Joanna’s scaler analysis in QA  • Legend: • * needed for FY03 run • { time in months} • J+P = Jan+Piotr • † - some code exist • ‡ assuming above is done •  service job

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