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NA61 Beam and Trigger

NA61 Beam and Trigger. A. Marchionni, ETHZ. North Area H2 line Beam control: CESAR Beam momentum The beams 75 GeV/c beam 31 GeV/c beam CEDAR and Cerenkov threshold counters The trigger. EHN2 (COMPASS). EHN1. ECN3 (NA48). BA80 (ps building). TCC2 access. CRN (obsolete).

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NA61 Beam and Trigger

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  1. NA61 Beam and Trigger A. Marchionni, ETHZ • North Area • H2 line • Beam control: CESAR • Beam momentum • The beams • 75 GeV/c beam • 31 GeV/c beam • CEDAR and Cerenkov threshold counters • The trigger

  2. EHN2 (COMPASS) EHN1 ECN3 (NA48) BA80 (ps building) TCC2 access CRN (obsolete) TCC2 targets (underground) BA81 (ps building) CCC CERN Prevessin

  3. 11% slope Primary Proton beam splitting • The proton beam (400 GeV/c) from SPS is slowly extracted to the North Area at LSS2 • The extracted beam is transported in the TT20 tunnel • 11% slope to arrive into TCC2 – then horizontal ; ~10m underground • The primary proton beam is split in three parts directed towards to the North Area primary targets: T2, T4 and T6

  4. SPS North Experimental Area NA49 CALICE/ILC GLAST, DREAM, AMS,… CMS ALICE CERF/SC-RP CRYSTALS/LHC Coll. TOTEM LHCb ATLAS

  5. Target Target Target station wobbling 0-order approximation: TAX B1 • single secondary or primary beam • fixed production angle SPS protons 1st -order approximation: TAX B1 • two secondary beams • one could be the primary beam • fixed production angles SPS protons B1 2nd -order approximation: TAX B1 • two secondary beams • one could be the primary beam • variable production angles Target SPS protons B1

  6. Beam Optics Hor. Vert.

  7. Quadrupole triplet Hor. H Trim MWPC 3,4 Momentum selection CEDAR V Trim Vert.

  8. Last section of H2 line XDWC03 &04 Cerenkov BPD2 S2 V0 V1 BPD3 S1 BPD1

  9. Beam should be centered on MWPC03, 04 • If beam is off on MWPC04, we should realign it using BEND02 and BEND03 • BEND04 and BEND05 determine the momentum of the beam Beam Momentum • BEND04 & BEND05 originally set to 97.3 A (⇒30.92 GeV/c) • The power supplies of BEND02-05 have a set error of 0.2 A (0.2%) • From past experiments (way back in the 70's) the absolute beam energy of the North Are beam lines was estimated to be of ~0.3-0.5% • By mistake BEND04 set to 97.2, BEND03 to 97.1 by CRN • maximum error of 0.4A ⇒127 MeV

  10. 75 GeV/c beam Trigger counters vertical alignment

  11. 31 GeV/c Beam

  12. set @ 3.3 bar • beam composition deducted from the 6-Fold coincidence which added up 96% efficiency • Normalizing to 100%, then the beam composition at the CEDAR is: • 83.7%  Pions +(muons,electrons) • 1.6%  Kaons • 14.7%  Protons

  13. Cerenkov threshold counter 99.977 1.65 bar 83.753 16.2% of protons

  14. Beam: S1·S2·V·CEDAR-6·Cerenkov • V= V1 OR V2 • Interaction trigger: Beam·S4 The trigger Target out run 5571, 1976 events Interaction rate: 1.71±0.04 % Target in run 5560, 9905 events Interaction rate: 7.01±0.07 %

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