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

Muon Spectrometer

Trigger system: RPC and TGCPrecision meas: MDT and CsC

Detector feetBarrel toroid Endcap toroid

+X points toward the center of the ring

Sector 13 is currently being used to study cosmics

Rails

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.

These are the StationNames as text and a number – taken from MuonIdHelper class as well as ATL-COM-MUON-2002-19Obsolete names have been removed

Station

Name

Station

No.

Station

Name

Station

No.

Station

Name

Station

No.

BIL 00 BOG 10 T2F 43

BIS 01 BOH 11 T2E 44

BML 02 EIL 13 T3F 45

BMS 03 EEL 14 T3E 46

BOL 04 EES 15 T4F 47

BOS 05 EML 17 T4E 48

BEE 06 EMS 18 EIS 49

BIR 07 EOL 20 CSS 50

BMF 08 EOS 21 CSL 51

BOF 09 T1F 41 BIM 52

T1E 42

Annotated pictures are toward the end of file

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

• 52 BIM should have been BIL but for the rails in sectors 11,15• 07 BIR 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!!

MDT and RPC names (contd.)

• 13/49 EIL/EIS Endcap Inner station Long/Short

• 14:15 EEL/EES. Endcap extensions and are next to barrel toroids

• 17:21 EML/EMS/EOL/EOS. Endcap Middle/Outer station Long/Short

• 41:48 TGC in the Endcap (see annotated figure for details)

• 49:50 CSS/CSL. CSC Short and Long Phi sectors

TGC and CSC names

from mTDR, page 68. RPC chambers are the thin hatched rectangles,in both the large/small sectors

BOS

X

Toroid Coils

Small MDT chambers

Large MDT chambers

BMS

BIS

BOL

BIL

BML

Voussoir

Strut

RPC chambers

from mTDR, page 72

BIRBIM

BMF

BOG

BOH*

Feet

* It seems that the BOH detectors do not exist!!

Railsx

Page 73 of mTDR – Chambers in the Feet Region (Sectors 12 and 14)

BOF (these are between the feet and do exist!)Detectors inside the feet are called BOG and not BOF (as labeled here)

I.P.

CSC

Page 69 of mTDR – Large MDT’s in the EndcapSmall MDT’s follow a similar pattern

EOL EML

EIL

EEL

CSC

F detectors, e.g., FOL are obsolete. Everything is now labeled E, e.g., EOL

T4E

T4FT1F

T1E1

T1E2

T1E3

T1E4

T2F / T3F

T2E5 / T3E5

T2E4 / T3E4

T2E3 / T3E3

T2E2 / T3E2

T2E1 / T3E1

VariousTGC detectors

Z (mm)

R (mm)

The numberafter E is the indexand is shownfor explanatorypurposes

The gray boxesare EndcapMDT’s

S,L correspond to MDT

EEL/EES*

*Position of EEL/EESis approximate

1

1

CSLCSS

~2

CSC

~2.7

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)