M1 Status

1
M1 Status G. Carboni for the Muon Group

• material budget
• cable layout
• status plans

2
Material budget what is in the MC
(T. Ruf)
chambers with the Faraday cages and electronics,
rest is uniform
3
Ingredients of X0 calculations
Try to be as accurate as possible by including
(hopefully) all importants elements Cross-check
calculations with measurements (weight) In the
final version local disuniformities will be
included to some reasonable level of
granularity Data used
cables
4
Average values Services
lttgt/X0
Walls Al 3 mm 0.034
Balconies Al bars 0.011
Ground Braids (v) Cu 50 mm2 0.007
Gas pipes (h) Cu ltLgt 2 m 0.019
HV/LVDS/ECS cables (v) ltLgt3m 0.028
LV Cables (h) ltLgt2m 0.009
Total 0.108
(h) mostly horizontal (v) mostly vertical
5
Average values chambers
FC 0.06
? GEM to be included for the detailed
description. Do not play a role in the average
6
Average values electronics cards
FC
0.06
Total electronics
0.0134
7
Summary
t/X0
Services 0.108
Chambers (incl. FC) 0.144
Electronics 0.013
Total 0.265
A modest increase w.r.t. the present MC
description
8
Cable layout
Original layout unsatisfactory because of large
disuniformities in material distribution
9
Old Layout M2-M5
Big X0 jumps
X
A-side
C-side
New layout proposed for M1 (Burkhard) to get a
more uniform arrangement of cable material for a
better EM Calo performance.
? But layout different from M2-M5
10
Cable layout
It was decided to stick to the old chamber layout
but to devise new more uniform cabling scheme

• Emiliano Danè (last week meeting)
• horizontal cables behind each chamber row
• (max 40 cables/row)
• remaining part arranged in vertical chimneys
• (two front and two back)

11
Rows with only R4 chambers rows from 26 to 32
(rows 2-gt8 mirrored).
b
c
d
a
Sec. a
Sec. b
ECS

• Used 3 clamps
• 12 places each
• 36 places in total
• For these rows we have 18 cables 8
  pipes 26 places

LV
HV
LVDS
gas pipes
12
Rows 22 and 20. (12 and 14)

• 68 cables in row 20.
• So 14 cables of chamber 20A3 go to row 22.
• See the Autocad file to better understand.

F
1st wires plane
Row 22
Row 20
a
B
C
D
E
G
2nd wires plane
Row 22
Row 20
13
Tray B chimney 126 cables
Tray A3 chimney 126 cables
External chimney 252 cables
Vertical routing
14
X0 budget due to cables
Average 0.039 ? 0.0370.0280.009 of estimate on
slide 4
15
gas pipes contributions in detail
16
Work in progress

• Software (Alessia)
• introduce the detailed description in the MC

17
Construction status
18

• Since our last meeting (LHCb week)
• the work on M1 beam started 3 weeks ago...
• ...and it stopped due to late (and not
  announced) delivery of panels due to a broken
  machinery at the company
• New delivery date July 20 (was June 22)
• a lot of effort done on implementing a - as
  minimal and uniform as possible - distribution of
  cables inside the active area
• and on top of this, a lot of engineering work by
  Alessandro
• In the meantime production centers are dressing
  M1 chambers
• GEMs here at CERN by the end of July
• ½ M1R4 here at CERN by early September (then
  M1R3)
• CERN M1R2 under preparation

19
Design Drawings

• All the structural elements have been defined and
  drawn
• Walls gtgtgt done
• Carriages gtgtgt done
• Handling System gtgtgt done
• Cable Chains (order gtgtgt done)
• We have to prepare the executive drawings of the
  Bottom Rail
• We are working on the chambers fixation
  (Balconies)

20
Design structural elements

• The walls will arrive the Cern at the end of July
  (20 th).
• The carriages will arrive the Cern next week

21
Rearranged Schedule Still to define Manpower shif
ts
22

• Effects of new schedule
• start of LV/Gas cabling not earlier than Sept 15
• start of HV/ECS/Signal cabling not earlier than
  Oct 15
• start of chamber mounting not earlier than Nov
  15
• probably some parallelism on cabling A/C side
  needed (otherwise too tight schedule)
• cabling in the big chain still to be understood
  (and the interferences with the other operations)
• The Muon group is willing to have a complete muon
  system by March 2008

23
SPARES
24
effects of the new M1 layout on TRIGGER
In the standard layout, all 5 chambers belonging
to a projective tower have the same ?Z w.r.t.
nominal position (so they have the same size).
With the new layout for M1only, we would have a
horizontal row as in the standard layout (Z 3 4
3 4 in M1 and in M2-M5) alternate to a row with a
sequence 1-2-1-2 in M2-M5 and 2-1-2-1 in M1
M3
M2
M1
3

• Towers with Z1111 in M2-M5
• see a smaller M1 chamber Z2

1
3
Y
3
IP
1
2
2
2
? Towers with Z2222 in M2-M5 see a larger M1
chamber Z1
1
1
25
TOP VIEW ROW 18 ACCESS SIDE
A2
A3
B
A1
IP