1. G. Carboni for the Muon Group
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
<t>/X0
Walls
Al 3 mm
0.034
Balconies
Al bars
0.011
Ground Braids (v)
Cu 50 mm2
0.007
Gas pipes (h)
Cu <L> =2 m
0.019
HV/LVDS/ECS cables (v)
<L>=3m
0.028
LV Cables (h)
<L>=2m
0.009
Total
0.108
(h) mostly horizontal
(v) mostly vertical

5.  GEM to be included for the detailed description. Do not play a role
Average values: chambers FC
 GEM to be included for the detailed description. Do not play a role
in the average

6. Average values: electronics cardsFC
0.06
Total electronics

7. A modest increase w.r.t. the present MC description
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.  But layout different from M2-M5
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->8 mirrored).
Sec. a
Sec. b
ECS
Used 3 clamps;
12 places each;
36 places in total;
For these rows we have: cables + 8 pipes = 26 places LV HV
LVDS
gas pipes

12. Rows 22 and 20. (12 and 14) F a B C D E G 68 cables in row 20.
So 14 cables of chamber 20A3 go to row 22.
See the Autocad file to better understand. F
Row 22
1st wires plane
Row 20 a B C D E G
2nd wires plane
Row 22
Row 20

13. Vertical routing Tray B chimney 126 cables Tray A3 chimney
External chimney
252 cables
Vertical
routing

14. X0 budget due to cables
Average  0.037= 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:
GEM’s 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 >>> done
Carriages >>> done
Handling System >>> done
Cable Chains (order >>> 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
shifts

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 ΔZ 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 = in M1 and in M2-M5) alternate to a row with a sequence in M2-M5 and in M1 M3 M2
Towers with Z=1111 in M2-M5
see a “smaller” M1 chamber Z=2 M1 3 1 3 Y 3 IP 1 2 2 2
 Towers with Z=2222 in M2-M5
see a “larger” M1 chamber Z=1 1 1

25. TOP VIEW ROW 18 ACCESS SIDEB A3 A2 A1 IP