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NA61 Beam and Trigger

Explore beam control and momentum at North Area 61, including beam transportation, target stations, and trigger systems for various experiments. Learn about beam optics, layout, and error analysis in this scientific facility.

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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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