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Muon Spectrometer Nomenclature

Explore the correct names for detectors in the Muon Spectrometer system with detailed explanations and annotated figures. Keep track of station identifiers, technology, and subsystem locations. Learn about MDT, RPC, CSC, and TGC detectors.

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Muon Spectrometer Nomenclature

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  1. Muon Spectrometer Nomenclature • Kevin Black/Vivek Jain/Stephane Willocq went through various documents and produced what we think are the correct names for the various detectors in the MuonSpectrometer • mTDR (Chapter 4 in particular) • ATL-COM-MUON-2002-019, Assamagan et al. • Please let us know if you spot any errors • This file was last updated on May 22, 2006

  2. Muon Spectrometer Trigger system: RPC and TGC Precision meas: MDT and CsC

  3. +X points toward the center of the ring Sector 13 is currently being used to study cosmics Endcap toroid Barrel toroid Detector feet Rails

  4. General naming scheme • The station identifier is a prefix to all subsystems - MDT, RPC, CSC and TGC: Detector.StationName.StationEta.StationPhi • Detector = 7 for the MuSpec • StationName specifies the location of the sub-system • See next page for a listing • StationEta increases with Z in the barrel and with R in the Endcap • StationPhi increases with Phi • An example of this prefix is 7.44.1.33 • 44 means TGC at the middle station in the Endcap • 1 is the eta index – closest to the beam • 33 is the phi index • The prefix is followed by other numbers and they describe in more detail the technology, layer number, tube number, etc. See ATL-COM-MUON-2002-019, K.Assamagan, et. al.

  5. These are the StationNames as text and a number – taken from MuonIdHelper class as well as ATL-COM-MUON-2002-19 Obsolete names have been removed Annotated pictures are toward the end of file

  6. Explanation of names for MDT and RPC • Station Numbers 00:05 • BIL: Barrel Inner (station) Long/Large Chamber (between toroid coils) • BIS: Barrel Inner (station) Small Chamber (around the toroid coils) • Similarly for BML/S and BOL/S, where M is Middle station and O is Outer station • 06 BEE is a barrel extension mounted on the Endcap • In 3-D figure on Pg. 3 , BEE fits into the cutouts in the Endcap toroid • 52BIM should have been BIL but for the rails in sectors 11,15 • 07BIR is Barrel Inner Rib (or Rails) and are below the rails and cover the gaps left by the BIM chambers • 08:09 BMF/BOF are around the feet of the detector • middle and outer layers • 10:11 BOG/BOH are on either side of the feet (outer) • BOH don’t seem to exist anymore!!

  7. MDT and RPC names (contd.) • 13/49EIL/EIS Endcap Inner station Long/Short • 14:15EEL/EES. Endcap extensions and are next to barrel toroids • 17:21EML/EMS/EOL/EOS. Endcap Middle/Outer station Long/Short TGC and CSC names • 41:48 TGC in the Endcap (see annotated figure for details) • 49:50CSS/CSL. CSC Short and Long Phi sectors

  8. from mTDR, page 68. RPC chambers are the thin hatched rectangles, in both the large/small sectors Large MDT chambers Small MDT chambers BOL Strut X BML BOS RPC chambers BMS Voussoir Toroid Coils BIL BIS

  9. * It seems that the BOH detectors do not exist!! from mTDR, page 72 BIM BIR Rails x BMF BOG BOH* Feet

  10. Page 73 of mTDR – Chambers in the Feet Region (Sectors 12 and 14) I.P. CSC BOF (these are between the feet and do exist!) Detectors inside the feet are called BOG and not BOF (as labeled here)

  11. Page 69 of mTDR – Large MDT’s in the Endcap Small MDT’s follow a similar pattern EOL EML EEL EIL CSC F detectors, e.g., FOL are obsolete. Everything is now labeled E, e.g., EOL

  12. The number after E is the h index and is shown for explanatory purposes 1 S,L correspond to MDT Various TGC detectors T2E5 / T3E5 T1E4 T2E4 / T3E4 1 EEL/ EES* R (mm) T2E3 / T3E3 T1E3 T1E2 T2E2 / T3E2 T4E T1E1 T2E1 / T3E1 The gray boxes are Endcap MDT’s T2F / T3F T4F T1F *Position of EEL/EES is approximate Z (mm)

  13. From mTDR Page 91: In reality, there is one CSS/CSL chamber with four gas gaps each(and not two chambers as shown in the picture) CSC CSL CSS h ~2 h ~2.7

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