10/03/005

Tracker Magnet Test and Cosmic Challenge

(version 8)

In this document we summarize the various activities foreseen to take
place during the Magnet Test. As well, we present the plans of the
various sub-detectors that will participate to the Cosmic Challenge.

All detailed documents relative to this activity can be found at:

http://cmsdoc.cern.ch/cms/Tracker/html/TPO/MTCC/MTCC.html

We have identified two major classes of activities, the mechanical
integration and the sub-detector system tests. The evaluation of tests
to be performed in both cases suggests to keep them fully independent
and to exploit different electronical equipment for the various
activities.

The MTCC will start with the insertion of the TK mock-up aluminum tube
inside CMS. Next we will perform cabling exercises around YB0 and we
will pre-cable a TEC mock-up sector. Finally we will participate to the
cosmic challenge with TOB-TIB and TEC sub-structures. Simultaneously to
the sub-detectors system test, we will verify the optical system which
aligns the TK w.r.t. the Muon System, we will study the thermal
efficiency of a fully equipped cable channel and we will verify the
behavior of the LV/HV power supplies in magnetic field.

1.  **Mechanical Integration Activities**

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i.  **Tracker Insertion with and without ECAL in place **

The Tracker mock-up aluminum tube will be inserted into CMS** **using
the final insertion tool already tested in an installation exercise
performed with the CMS maquette. The sub-detectors will be already in
place inside the mock-up tube during its insertion. The TK mock-up will
be equipped with the final cable supporting system and the cables from
the various sub-detectors will be attached to it with temporary
fixations. The final platform for placing the TK tube at the right
height for the insertion into the vacuum tank is being prepared.

The scope of this test is to verify:

-   The feasibility of the insertion of the Tracker

-   The correct handling of the services during installation

-   The feasibility of the insertion of an ECAL module with the TK
    already in place

All the equipment is or in hand or in design/construction phase.

i.  **Tracker cabling exercise around YB0 and TEC pre-cabling**

The cabling exercise around YB0 will be a complete exercise that
includes the lay down of a cable channel from PP1 to the "balcony" (64
channels will be present in the final configuration) . The cable channel
will include LIC and control cables, pipes positioned in the final
location, heating system and isolation material. Al MSC and pipes will
be lay-down from PP1 to a bulk-head sector equipped with a TEC PP1
mock-up. In this region all the cables will be terminated with loads
simulating the detectors. Power will be provided by final power supplies
located in the balcony.

The main goals of this test are:

-   To verify the possibility of pre-cabling the TEC and the feasibility
    of the insertion of an ECAL module with the TK cables in place

-   To evaluate the design of the cable channel and the heat exchange in
    the new running configuration ( -30 ^0^C, 85 m pipe length)

-   To evaluate the impact of a reduced insulation thickness on the
    cooling plant performances

-   To prove the absence of condensation along the cable path and in PP1

The material needed for this exercises is listed in the table 1.

i.  **Alignment **

No tests of the TK internal alignment system are foreseen for the Magnet
Test. Only the optical system which aligns the TK w.r.t. the Muon System
(LINK) will be tested. The test of the LINK system will be a joint
effort of the TK and the MS alignment communities.

The main goals of this test are:

-   To make one half of the LINK system operational in the real scale.

-   To study relative movements of the LINK components with switching-on
    of the B-field, and to conclude about sufficiency of the sensor
    dynamic ranges,.

-   To study the behavior of the sensors working in the B-field.

The alignment Ring will be provided by the TK community while all the
equipment installed on the Alignment Ring and on its support structure
(collimators, tiltmeters, temperature and B-field probes, as well as
there read-out systems) is a responsibility of the MS side.

1.  **Cosmic Challenge and System Tests**

The three sub-detectors will be positioned inside the Support Tube such
as to cover the region equipped by the barrel (sector 10 of YB1 and YB2)
and forward cchambers.

To be as informative as possible we intent to have set-ups as close as
possible to the experimental situation, i.e. production modules and
mechanical structures, final cables, power supplies and control racks
positioned at the side of the magnet to simulate the final balcony
position in the pit. This will give us a first impression of the noise
and grounding requirements. As well we will collect information about
the working in main and stray magnetic fields.

i.  **Sub-detectors mechanical lay-out**

TOB, TIB and TID will exploit production modules and structures that
will not, later on, be re-used in the Tracker. The TEC will re-use all
the equipment in CMS. In table 1 below we summarize the maximal
equipment foreseen to be used in the cosmic challenge by the three
sub-detectors.





\# SS modules

\# APV



TIB

layer 3 proto







TID









TOB

8 rods

60

252



TEC

3 back + 3 front







\
Table 1. Equipment installed during the MTCC

The TOB mechanical structure will support the TIB/D as described in fig.
1a or 1b. The TOB+TIB will be placed at the bottom of the supporting
tube. Two fixation systems are under study. The first one, more
complicated, relies on the existing sliding rail system, the second one,
advantageous from the installation point of view, will imply the
construction of an additional sliding system positioned at the bottom of
the supporting tube.

The TOB structure consists of two supporting plates with several slots
machined at the inner, outer and intermediate radii (not shown). This
allows a maximal flexibility for deciding, later on, the exact position
and number of rods to be installed.

The TIB will install the prototype L3.

Fig. 1a The ensemble TOB+TIB Fig. 1b The ensemble TOB+TIB

supported by the current sliding system supported by an new sliding
system

The TEC will have 3 back plus 3 front petals of disc types 3, 6, 9 in
the maximal configuration. The absence of the beam pipe allows the
variance of different petal types to obtain maximal information about
the working of the different control rings and the noise distribution.
All petals will be fixed in the lower part of a disk 9. The alignment
disk 10 will protect the petals towards the bulkhead, whereas a simple
carbon fiber disk will close it to the inner part of the tube (fig. 2
and 3). Bulkhead, D10, D9 plus a protection disk will be connected by
several dummy service channels made in aluminum. These channels will
also serve to support the TEC inside the support tube.

Fig. 2 The lay-out of the TEC disks, bulkhead and alignment ring

Fig. 3b Front view of the petal configuration for the magnet test

The alignment Disc 10 will hold the alignment ring to the outside (fig.
4). The alignment ring will be supported by three pillars, which are
glued to the D10. The bulkhead, also attached to D10, will have three
holes to house the pillars and will have no direct mechanical contact
with the alignment ring. The alignment ring will be equipped with six
collimators which send laser beams toward the MS, three proximity
sensors and two integrated devices each of which combine one 2D
tiltmeter, one temperature probe and two 2D Hall probes (fig. 4)

Fig. 4 Lay-out of the instrumented alignment ring

i.  **Sub-detector commissioning before the Cosmic Challenge**

We propose to qualify L3, the rods and the petals accordingly to the
established procedures adopted in the production lines (Pisa, FNAL, PIC
centers).

The question to ask now is: where to commission the three sub-structures
before their installation in the support tube? Considering the overall
Tracker schedule (see chapter 4) we observed that, at the beginning of
the month of July the DAQ2 system could be operational (with some
contingency) to be ready to make acceptance tests for the TIB+. The
sub-detectors participating to the MTCC should be commissioned in the
month of July. We therefore propose to:

-   Anticipate the preparation of TIB counting room

-   Anticipate the preparation of DAQ2 simultaneously with the DAQ for
    the MTCC

-   Commission the sub-detectors for the MTCC in the TIB room located in
    186

i.  **Infrastructure available and their exploitation in CMS:**

*[Cooling:]{.underline}*

Only a water cooling plant (\~18°C) will be provided by CMS

TOB and TIB/D, will exploit water cooling for (note that both structures
will not be final and therefore can afford to circulate water).

TEC will install production petals. It is therefore suitable to use
final coolant. A cooling plant running C6F14 should be provided.

The cable channel will exploit a C6F14 cooling system. The cooling plant
is available.

*[Dry air circulation]{.underline}*

We will close the support tube with a bulkhead on one side and a plastic
sealing on the other such as a clean environment with high RH can be
maintained. This will fulfill the requirement of the TOB and TIB/D. The
TEC requires low RH but the mechanical design they will adopt includes a
sealing such as dry air, in stand-alone, can be circulated inside. Same
statement is valid for cable channel.

i.  **Electronics Integration and control in CMS**

From what has been announced as detectors available for magnet test it\
appears that we may need 3 sub-partitions TIB TOB TEC (at least to\
exercise our local DAQ then maybe later on concatenated in one Tracker\
partition seen from Central DAQ).

From DAQ modules point of view, given the present modules status (to be\
confirmed) it seems realistic to obtain 7 FEDs (1\
TOB, 3 TIB, 3 TEC) and 3 FECs. For FEC we of course consider VME 9U
FECs\
in order not to limit the number of rings. The additional Timing and\
Trigger module will have to be provided but should not be a major issue\
if we start now to manage this (LTC, TTCeX, TTCvX, TSC). This would be\
equivalent in term of complexity and partitioning to what has been done\
last year in cumulating the two test beam periods in X5 (same order of\
magnitude and complexity). Of course the software (and firmware) will\
have followed some evolution towards a more final situation compared to\
last year (and will thus have additional \"features\"). For the DAQ
this\
should be in principle tested a fair amount of time in advance in 904\
with detectors that we are trying to recuperate from last year exercise\
(telescope and petals). What has to be clearly established in the near\
future is when and where these DAQ modules will be needed. In any case
what\
would be necessary is that we may integrate in a DAQ scheme gradually\
all 3 subsystems TIB TOB TEC when they are ready to be delivered, one\
after the other and then globally in a Tracker DAQ scheme. As mentioned\
by Frederic, the work of merging  a set of several sub-partition to one\
full Tracker partition is quite simple, going back from one partition
to\
several sub-partitions is much more complicated in term of data base.

i.  **Quench related measurement **

The power supplies will be positioned in place equivalent, from the
stray field point of view, to the final location they will have in CMS.
We suggest to monitor the behavior of the PS with the slow control
system and, if possible, with the testing system used to qualify the PS
before their procurement.

We are evaluating the use of** **a RASNIK system to measure any movement
of the different structures during quench!

1.  ** Schedule**

A preliminary schedule for the Tracker activities during the magnet test
and cosmic challenge is presented below.. Items highlighted in green are
extracted from the CMS schedule. Any activity of insertion of
sub-structures inside the TK mock-up tube will happen after the
completion of the TOB/TIB cabling exercise. Following these boundary
conditions, and assuming one month for the commissioning, insertion and
cabling of the sub-structures that will participate to the Cosmic
Challenge, we set the sub-detectors ready for installation milestones
for the month of July.

1.  ** Summary table with all the services and electronic request**

The MTCC will take place from September to November, simultaneously with
the integration activities of TOB/TIB/TEC. The equipment needed for the
Cosmic Challenge is listed in table 2 while the equipment needed in the
integration centers is listed in table 3. Note that commissioning the
sub-detectors in a unique place (bat. 186 is our current suggestion)
will minimize the amount of equipment to be procured.

  

TIB

TOB

TEC

YB0

total



Alu MS cables

2

8

12

25

**  **



Cu LIC(?) cables

3

8

12

36

**59**



Optical ribbons

4

12

24

  

**  **



Optical cables (Erikson)

1

2

3

  

**6**



DOHM + ribbon

1

2

3

  

**  **



CTRL optical cable

1

1

1

  

**3**



CTRL pwr cable DOHM section

1

2

3

  

**  **



CTRL pwr cable PS section

1

2

1

10

**14**



Power Supply Modules

2

4

12

18

**36**



CTRL power channels

1

2

3

  

**6**



U9FEDs

1

2

3

  

**6**



mFECs

0

2

3

  

**5**



9U FEC

1

1

1

  

**3**



VME crates

  

  

  

  

2?



SY1527

  

  

  

  

**1**



PS branch ctrl

  

  

  

  

**2**



PS crate

  

  

  

  

**5**



48 V

  

  

  

  

**5**



TRIGGER boards?

  

  

  

  

**  **



interlock

  

  

  

H&T

**  **



PP1 & Optical Pannel

  

  

  

  

**  **



Cooling line (=1in+1out)

2

2

3

3

**  **



Table 2 : equipment needed for the Cosmic Challenge (**still subject to
changes**!)











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multi

multi

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

















ribbons

ribbons





**

**







9U 

9U 

VME

VME 

SY

PS 

PS



L/HV

CCU 

MS

ctrl

(8 fib.)

(8 fib.)





**

**

OEC

FED_PCI

mFEC

FEC

FED

LTC

crate

1527

crate

ctrl

48V

PSM

PSM

cable

cable

for FED

for ctrl

interlock



TIB-D sub-assembly

1

6

10

9

1

2

3

1

4

9

9

9

46

7

92

4





1



Pisa

2

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3

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TIB-D sub-assembly

1

6

10

9

1

2

3

1

4

9

9

9

46

7

92

4





1



Firenze

2

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3

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

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

TIB-D sub-assembly

1

6

10

9

1

2

3

1

4

9

9

9

46

7

92

4





1



Torino

2

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3

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

TOB

1





3

1

4

1

1

1

2

2

2

11

2

22

3





1



(integration + Crack)

2





5

1

8

1

2

2

4

4

4

22

3

42

5





1





3





7

1

12

1

2

2

5

5

5

32

4

64

7





1







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









TEC+

1





1

1

1

1

1

1

1

1

1

2

1

3

1

1

1

1



Aachen

2





10

2

6

1

1

1

4

4

4

26

3

48

9

6

2

1





3





10

2

11

1

1

1

4

4

4

26

3

48

9

12

2

1













































TEC-

1





1

1

1

1

1

1

1

1

1

2

1

3

1

1

1

1



Lyon

2





10

2

6

1

1

1

4

4

4

26

3

48

9

6

2

1





3





10

2

11

1

1

1

4

4

4

26

3

48

9

12

2

1













































Cosmic challenge

3















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







































Total needed till March \'05

1

18

30

32

6

12

12

6

15

31

31

31

153

25

304

17

2

2

3



Total needed till June \'05

2

0

0

25

5

20

3

4

4

12

12

12

74

9

138

23

12

4

3



Total needed after June \'05

3

0

0

27

5

34

3

4

4

13

13

13

84

10

160

25

24

4

3













































Table 3 List of material exploited by the Tracker integration