cms tracker infrastructure work in ls1

CMS Tracker infrastructure work in LS1

• Scope• Planning 2012-2014• Infrastructure tasks • Implications for funding agencies

TK_It 26/03/2012 Ettore Focardi 1

Scope of LS1 infrastructure work

• Main objective: After LS1 the Tracker must run cold.• Need -100 C on sensors• Need -200 C (or -25C, if possible) coolant in Tracker• At present, lowest SST coolant temperature is +4C

• Current obstacles on lowering the temperature:• Humidity levels too high: Dew point ~ 0C in the TK service channels inside YB0• Cooling capacity of the SS and ‘brine’ cooling plants not sufficient (min. -40 C)

• In addition, improvements needed on performance and reliability of many related sub-systems: dry gas, dew point measurements, Pipes insulation, heaters, thermal screens, etc.

• LS1 is the UNIQUE OCCASION to solve these, we need to prepare for it now!


Photo: M. Hoch

Planning 2012-2014

• LS1 is already this year !


Now

LS1 start

LS1 end

2012

2014

2013

• For many of the tasks we need full access to inside YB0, both ends.• We want to work inside YB0 early,

to leave time for testing and possibly needed improvements.

‘Full’ Limited

• Are the currently allocated access times enough? We don’t know yet, need to work out a more detailed planning,

looking to the interconnections between other subdetectors work and services availability

CMS closedMagnet test

• Full proof check when CMS closed and magnet on. • If failing, need a big planning change to re-gain access inside YB0.

Currently planned YB0 accesses: Limited

CMS LS1 planning, March 2012 draft


Full access to YB0, currently 40 working daysin March-April 2013

Plan details


Infrastructure tasks to be accomplished

• Tasks grouped in following categories:• Vapour barriers and seals• Dry gas• Dew point sensors• Other YB0 activities• C6F14 cooling system

• CO2 cooling system

• Power system• Rack cooling• General services• Other tasks

• Tasks listed in an Excel file, available on “CMS Tracker Engineering and Infrastructure” Sharepoint site: https://espace.cern.ch/cms-tracker-engineering/Shared%20Documents/Forms/AllItems.aspx


Vapour barriers and seals


Continuous vapour barrier up to PP1s or edge of vac-tank

Potting of services

Inner seal between CMS end-cap and TK bulkhead

CMS inflatable seal

Bulkhead cover plates and seals up to beam-pipe

Local sealing

Humidity barriers

Ettore Focardi

Photo: M. Hoch

TK_It 26/03/2012

TK service channels

BulkheadPixel volume seals

8

TK bulkhead open


TK bulkhead edge


This is ECAL. No vapour barrier on the backside between ECAL and TK services !

Many TK cooling pipes without insulation

THIP venue


Multiple paths for humidity to reach the TK bulkhead, via HCAL and ECAL volumes

Local vapour barrier @ bulkhead


Last Section of a PP1-Channel

Region to be “boxed”

A C

B

Pipe insulation ends ~here

Tracker bulk-head

Extra dry gas flow

CMS global seals


Add here a seal between CMS barrel and endcap?

Tasks: Vapour barriers and seals (1/2)


2012 2013Tasks / Sub-tasks / Milestones Contact Comments Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb

LS1 Dates still to be confirmed 16 Nov start of LS1 All sample materials available Antti Vapor barrier, tapes, foams Material safety qualifications ready Antti Fire safety tests not done at CERN!! Mock-up tests completed Antti Also to train people Define final sealing configuration Review of the THIP Karl Decisions on procurements&plans. TC,

ECAL and HCAL involved.

Order all needed materials Antti All needed materials available Antti Push-tool ready for pixel volume leak test Paolo, Mimmo Pixel volume leak-test with push toolIncludes visual inspection of all seals from beam-pipe to TK bulkhead

Paolo, Gino, Mimmo

Immediately after CMS opened and access to TK Bulkhead

Check and seal Pixel and Strip volumes from each other

After Pixels and Beam-pipe removal

Seal the empty Pixel volume with a cap

Tasks: Vapour barriers and seals (2/2)


2013 2014Tasks / Sub-tasks / Milestones Contact Comments Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb

LS1 16 Nov start of LS1Pixel platform in use, until end of 27 Feb 2012 36 days in the current global planning

Surkov frame in use When can we install this? Restricted access, to one end at a time As of 24 April 2012 Install local sealing at the Bulkhead perimetry See Karl's proposal for starts.

What can be done from the Pixel platform?Add extra gas injection + sensors, and measure.Install final humidity sensors, before 'boxing'.

Install sealing below and inbetween all TK, EB and HB service channels, at the TK PP1 level.

Can this be started while we have the Pixel platform?

Open PP1 boxes and 'inject sealing' to the exit side service channel.

Can this be started while we have the Pixel platform?

Open EB/HB channels and 'inject sealing' at the PP1 level / vactank end?

What can be done? Armaflex, potting?

Install global sealing from Bulkhead to PP1 level. Where to start? Try to measure the dew point evolution?

Measure humidity levels Permanently during all work

Humidity performance measurement, with cooling on.

Can we have the cooling on at this time!?

Improve sealing, during limited access period

Provide access for HB electronics, through global sealing

Later in LS1

Redo global sealing at HB electronics Later in LS1 Sealing after Beam-pipe and Pixel installation

Re-measure humidity levels After CMS closed Design and implement dry gas injection and exhaust to Pixel volume

Pixel team

During Pixel stay in the upstairs Cold Room.

N2 & Compressed air network @ P5Update on March 19th, 2012 (Paola)

Summary of existing systems for air and N2

3 Compressed air production sites/circuits- SU5: “Soufflettes” – in good conditions, being used also for Tk brine cabinet flushing in CV room (a better solution should be investigated)- SL5: “Haute Pression” – used for moving wheels, CMS responsibility- SH5: “Instrument air” + Tk cooling units, etc.– most critical circuit, 180

Nm3/h available

2 liquid N2 dewar systems- 1 “Big” for magnet cryo + detector flushing, max gas flow 60 Nm3/h- 1 “Small” for DT and piloting of gas circuit valves

TK_It 26/03/201216Ettore Focardi

USERS OF N2 and DRY AIR @ P51) UGX55 quick connectors2) EN/CV valves in CV zone3) Tk I/P cabinets

(top of by-pass)4) Ecal I/P cabinets (top of by-

pass)5) Drier A (gas room)6) Drier B (gas room)7) Switch-over panel N2/dry air

for detector flushing (gas room)8) Tk & ES cooling cabinets9) Detector flushing10) Beam pipe vacuum system

shut-off valves (+many “piquages” in UXC)

11) Cryo valves (magnet area)

Present layout of Nitrogen (gas) and dry air at P5

TK_It 26/03/2012 Ettore Focardi17

Cryo cold box

N2 dewar62 Nm3/h gas when no LN2 is used

SH5 compressors dry air supply105 Nm3/h average180 Nm3/h peak

GN2 back-up line

9Detectorflushing

62 Nm3/h GN2 for detector flushing

LN2 line

1

2

3 4

567

88

11

10

Present issues and outlook

• The instrument dry air is used both for detector flushing (when no N2 is available/can be used), cooling box flushing, valve piloting

• The total dry air flow available is NOT enough for all applications (see tables)

• In addition, no precise instrumentation and recording of consumptions!

• N2 cannot be used both for detector flushing and magnet cool down neither for nominal consumptions nor future guess consumption

• In the tables: the total amount of dry air and N2 consumptions as of today and the nominal/foreseen consumption for the future:N.B. Yellow values are guess numbers! HUGE MARGIN SHALL BE FORESEEN AT LEAST TILL THE END OF LS1


Detector flushing during LS1: needs and proposal

- During LS1, sealing works will be executed at the level of the Tk bulkhead and will need to be validated

- Validation of such works implies operation of the TK cooling systems at low T while CMS is still in open configuration

- In this scenario, only dry air can be used for flushing, and not N2- Only a tentative guess can be made on the needed air flow for this exercise

(at least 50 Nm3/h for Tk bulkhead, at least 60 Nm3/h for cooling plants….but it could be much more)

Present dry air system gives max 180 Nm3/h. Estimated needs for LS1- About 70 Nm3/h for valve operation- At least 60 Nm3/h for cooling plant flushing- At least 130 Nm3/h for detector flushing

Market Survey from A. Gaddi: plant exists that can provide both dry air or N2 do exist on the market, typical size could be 400 Nm3/h N2 or 700 Nm3/h dry airMore details in the following

TK_It 26/03/2012Ettore Focardi 19

USERS OF N2 and DRY AIR @ P51) UGX55 quick connectors2) EN/CV valves in CV zone3) Tk I/P cabinets

(top of by-pass)4) Ecal I/P cabinets (top of by-

pass)5) Drier A (gas room)6) Drier B (gas room)7) Switch-over panel N2/dry air

for detector flushing (gas room)8) Tk & ES cooling cabinets9) Detector flushing10) Beam pipe vacuum system

shut-off valves (+many “piquages” in UXC)

11) Cryo valves (magnet area)

Proposal for new layout of Nitrogen (gas) and dry air at P5


Cryo cold box

N2 dewar62 Nm3/h gas when no LN2 is used

SH5 compressors dry air supply105 Nm3/h average180 Nm3/h peak

GN2 back-up line

9Detectorflushing

62 Nm3/h GN2 back-up for detector flushing

LN2 line

1

2

3 4

567

88

11

10

SH5 NEW dry air/N2 supply700/400 Nm3/h

RED DASHED: NEW CONNECTION x CABINET FLUSHING

Tentative planning

Summer 2012: Order launched for new plant in SH5Nov-Dec 2012: installation and commissioning of new N2/dry air plantAp 2013: Tk sealing and cooling work completedMay-Jun 2013: Humidity tests of new sealing, using dry air, assessment of total quantity neededJan 2014: New beam pipe & Pix inside CMSFeb 2014: CMS closed, Tk cold and ON as soon as possible for tests of humidity and operation in cold - at this stage N2 source is needed!!! Rental of dewar seems a good optionLater in 2014: commissioning of N2 plant, switch from rental dewar to plantTK_It 26/03/2012 Ettore Focardi

21

Now

LS1 start

LS1 end

2012

2014

2013

Install new dryer/N2 plant

Rented N2 dewar operational

N2 plant operational

Buy newplant

Dew point sensors, not an easy installation job!


Dew point sensors2012 2013

Tasks / Sub-tasks / Milestones Contact Comments Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar AprLS1 Sensors stand for FOS, XENTAUR,

HS2000, Arduino,Sniffer

Install test sensors in Cooling station

in DCS

Qualify sensors get experience, exchange sensor arrays?

Define final config for LS1 Need to know number of sensors Define cable routing Procure more sensors if needed if add sensors needed Procure connectors, cabling and piping

Calibrate sensors if add sensors needed Connections ready at balconies cables incl. length to VACTANK

ready and connected to readout systems. Use a Technical stop to go through cavern seal?

Array of local 'test' sensors ready for first "test sector sealing" Temporary routing to VACTANK/BH

as soon as we have access plus minus

Sensor installation according to final config plus minus Final routing of services if YB1 & YB2 will be opened at all Decide if/which 'test' sensors will remain in VACTANK

FOS Salvatore/PaoloXENTAUR Andromachi/PGVSniffer system Andromachi/Roberto/LalithHS2000 Andromachi/PGVArduino 'test' sensors Francesco


Other tasks in YB0Tasks / Sub-tasks / Milestones Contact Comments

Design and construct missing tooling / platforms

2nd bulkhead bridge platform (Paolo)

Leak checks Checking of broken parts Thermal testing / improvements of YB0 cooling bundles?

1 bundle tested to -20C. Can anything more be done now?

PS sensing lines Anne-Marie Requires access to pp1 (BH)Problematic control rings Anne-Marie Requires access to pp1 (BH), detail; list

will come Commission cable channel heaters Andromachi/PGV Test heating, with sensors in-situThermal Screen faulty heating panel Andromachi/PGV This is a must. Need access to BH.Commission Thermal screen for cold operation

The heating side is weak.

Leak search and repair Fabrizio Raffaelli R&D on possible solutions on leaks

inside TK volume. Ideal solution is access from balcony.

Check leak situation in BH area SniffCooling Pipes insulation check Nicola


Tracker Cooling Pipes Check-out

TK_It 26/03/2012 25Ettore Focardi

As mentioned before, LS1 goal is o Operate the whole tracker system (SS, Pixel and TS) at

« nominal » coolant temperature. From radiation damage point of view, it seems that it would be

beneficial to reach beyond -200 C (perhaps -250 C) and every further degree we can go to it would improve detector lifetime, but is possible?

Assuming we have no limits coming from the « brine » and cooling plants, what is the lowest coolant temperature we can safely achieve without condensating between cooling plants and PP1s(*) ?

In 2007, during the pipe installation campaign, some pipes of a sector were tested with -200 C coolant and measured T to be roughly at +13 0 C on the outside of the insulation layers, which is the guaranteed max. dew point value in the cavern.

(*) Here it is assumed that the heating cables/foils system between PP1 and the detector will give us quite a bit of margin and will not be the limiting factor. Is this true ?

Tracker Cooling Pipes Check-out

TK_It 26/03/2012 26Ettore Focardi

• After some discussion (last week) it seems agreed to monitor T in all routes from PP1 to ~PP2

• It will be probably useful to test during LS1 at least the sector -6 route ( biggest

bundle of pipes, ~80) by using the Pixel pipes, bypassed at PP0

• Test bench with pipes, insulations, vapour barriers can be prepared and results compared with calculations.

-2,-3

-16,-17,-18

-13,-14,-15

Muon Sector (black)PP1 (red)

-11,-12SS2

SS1PixelTS1,TS2

-4,-5,-6,-7,-8,-9


-Z end

Cooling systems

• C6F14 cooling system performance increase• Absolutely needed• Full performance necessary in 2014 when TK commissioned for cold operation.• Partial availability needed also in 2013 to check humidity sealing quality.

• CO2 cooling system (Pixel Ph1 upgrade)• Must progress also, and profit from unique access during LS1.• Prepare as much as possible the field for a much shorter access during a later

YETS;plant location and pipes/services installation


Other tasks

• TK power systems maintenance and replacements Possible replacement of mainframes and Branch controllers (2014)

• Rack cooling improvements• DAQ PC replacements

During 2013• Test Module Thermal behavior (186)

• 2012• Others … ?


Summary

• A very long list of tasks to be accomplished• Lots of careful engineering work to be done within the next few months,

followed by procurements:• Increased dry air supplies (compressors, driers, pipework components)• Materials for humidity barriers and sealing• Dew point sensors, including their calibration• C6F14 cooling system improvements (SS and brine plant heat-exchangers,

pumps, valves, plant door replacements, etc.)• ...


Now

LS1 start

LS1 end

2012

2014

2013

Engineering, design

Procurements

Implications for funding agencies

• Substantial investments to equipment (dry gas supplies, cooling system, sensors), but seems under control as reserves and provisions have been made (TFB)

• The bottle-neck is our very limited availability of suitable manpower to cover the complete list of tasks.Leads right now to tasks being left not covered, or with slow progress.• Engineering / Design• Procurements• Developments, testing

• The current big risk is that we will be late with the needed preparations before LS1 starts --- in 8 months ! This includes the summer vacation period...

• We pursue the planning work to more detail level, and are looking for persons to take responsibilities of specific tasks.TK_It 26/03/2012 Ettore Focardi31

Impact on INFN

Tracker plan to face the manpower needs for the foreseen actions in LS1:• create ~6 teams of 3-4 people to act possibly in parallel

Cern plans to use 7-10 people

USA plans to use 3-5 people

INFN target 3-5 people

Others: 3-5 people

Possibility of technical positions (6-12 months) for young engineers/physicists Starting from 2012.Let me know eventual availability of people….


cms tracker infrastructure work in ls1

Documents

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tk services

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tk cooling pipes