# Presentation: 925448

## 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

**Muon Spectrometer**

- Trigger system: RPC and TGC
- Precision meas: MDT and CsC

## Detector feet

- Barrel 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-2002-19

- Obsolete 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,

- 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

- BIR

- BIM

- BMF

- BOG

- BOH*

- Feet

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

- Rails

- x

## 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 Endcap

- Small 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

## Various

- T4E

- T4F

- T1F

- T1E1

- T1E2

- T1E3

- T1E4

- T2F / T3F

- T2E5 / T3E5

- T2E4 / T3E4

- T2E3 / T3E3

- T2E2 / T3E2

- T2E1 / T3E1

- TGC detectors

- Z (mm)

- R (mm)

- The number
- after E is the
-  index
- and is shown
- for explanatory
- purposes

- The gray boxes
- are Endcap
- MDT’s

- S,L correspond to MDT

- EEL/
- EES*

- *Position of EEL/EES
- is approximate

***1***

***1***

## CSL

- CSS

-  ~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)