patras collaboration meeting 1 status in sr8 martyn davenport 22.05.06

PATRAS Collaboration meeting

1

Status in SR8

Martyn Davenport 22.05.06


2

Status in SR8

• SR8 last 2 months• End of shutdown• Start of data-taking (details Jaime)• Comments on data-taking• Shutdown for PATRAS• Comments on CAST PC network• LHC 8 cryogenic tests (quenches) soon

• Validity of CAST data ? (Zaragoza)• TAO• Coherence• Windows

• Roadmap for 3He system• Updated roadmap• 3He cold windows

• Schedule • MM line installation• 3He system• 50mbar end 2007?• Timetable for request for extension

• Conclusions


3

• End of shutdown• Change magnet movement drive cables

TPC much less noise MM more noise ??? (need experts to debug)

• Bake-out RT vacuum line MFB-MRB Reduce long-term outgassing of H2O onto windows

• Cool-down magnet OK, no leaks found on cryostat/new VT3

• Sun filming Julia to report

• Check of mis-alignment V1 V2 vacuum lines (inside MFB) with vacuum in cryostat OK

• Mini-GRID OK (I believe) very similar to previous ones However - should we realign the magnet ? GRID & sun tracking do not agree (Julia?).

– Hence do we understand measurements well enough to move ? We need a meeting of experts to decide (video +Juan?)

• TAO tests by Nuno with new cold bore pressure probe• Power up magnet

1 training quench

SR8 last 2 months

1 arc min

radius

Mini-grid points magnet moving as in sun tracking


4

SR8 last 2 months

• Startup eventful• MM test of MM line elements compatibility with CCD-Telescope

Problems – modifications needed

• Problems with MM V4/V3 V5

• CCD turbo, late service Eco-dry primary

• Unstable vacuum in CCD (H2 bubbles rising from newly-maintained eco-dry) Bojon solved in 1 hr in between other jobs – brilliant. No replacement yet.

• Start of data-taking (details Jaime)• MM Misalignment (see next slide)

• TPC source calibrator arm

• Quench on last shift – CERN-wide power cuts.

• New mechanical support technician – Yves (paid by CAST CERN ‘in kind contribution’)

• Comments on data-taking (see Jaime’s report)• Jaime doing a great job as run coordinator (+ TPC expert+ default shifter)

• Number people at CERN inadequate since restart

• Heavy load on personnel at CERN ( MM not fully covered, …….)

• Several breakdowns – difficult decisions change or not pressure Strategic spares essential, systems already running for 3 years. Already broken ad hoc rules concerning changing gas pressure

• Feedback from detectors MM & CCD (computer Munich) sometimes slow


5

Micromegas alignment after intervention

Was 5 mm

Was -11 mm

When CCD telescope + MM line which beam line to align ?

Need response from MM in next days – another adjustment of alignment ?


6

SR8 last 2 months

• Start of data-taking (details Jaime)• MM Misalignment (see next slide)• TPC source calibrator arm• Quench on last shift – CERN-wide power cuts.• New mechanical support technician – Yves (paid by CAST CERN ‘in kind

contribution’)

• Comments on data-taking (see Jaime’s report)• Jaime doing a great job as run coordinator (+ TPC expert+ default shifter)• Number people at CERN inadequate since restart• Heavy load on personnel at CERN ( MM not fully covered, …….)• Several breakdowns – difficult decisions change or not pressure

Strategic spares essential, systems already running for 3 years. Already broken ad hoc rules concerning changing gas pressure Existing = (sunrise) >90% telescope (sunset) >50%

• Feedback from detectors MM & CCD (computer Munich) sometimes slow


7

SR8 last 2 months

• Shutdown for PATRAS• Agreed at Zaragoza

• Trying to exploit time Laura – maintenance of failing compressor + cryogenic quench recovery procedure Nuno – tests with / without window heaters

• Must fix schedule today and send to Tapio instructions (see next slide) Program for Nuno MM realignment ?

• Some outstanding jobs• Install Drytel # 2 on MRB (see slide)

Leak test (Bojon) Test functionality of interlocks

• Complete installation horizontal and vertical magnet position reference systems

• CAST PC network• Discussions with CERN network experts

• Must either follow CERN standards or go alone and take consequences

• No CAST expert available to make decision and take responsibility

• Main problem is Juan’s PC. Taking steps to clone it with new equipment for eventual replacement


8


9

Nuno -Should we do V=+/- 8 for completeness ?

Ioannis – should we realign the MM?


10

SR8 last 2 months

• Some outstanding jobs• Install Drytel # 2 on MRB (see slide)

Leak test (Bojon) Test functionality of interlocks

• Complete installation horizontal and vertical magnet position reference systems

• CAST PC network• MD doesn’t understand enough to make decision• Discussions with CERN network experts (+ Thomas & Silvia & Markus)

Must either follow CERN standards or go alone and take consequences

• No CAST expert available to make decision and take responsibility• Main problem is Juan’s PC.

Taking steps to clone it with new equipment for eventual replacement

• LHC 8 cryogenic tests (quenches) soon – could affect CAST strongly• Requested study into decoupling CAST from LHC 8 (will cost significant money)

No reply from TS-EL group –overloaded by LHC work) now have to go up TS hierarchy


11

Validity of CAST data

• Zaragoza worries• TAO/Window spots/Coherence

• TAO• See Nuno for details• No longer my main worry.

• Coherence• CAST in unchartered territory

Cold windows/helium filling cold bore/heaters on cold window flanges

• Thermal gradients/density gradients along magnet Yannis Semertzidis & Markus supervising a simulation

– Yannis concludes coherence loss from spatial separation axion/photon not a worry GOOD

• End effects due to cold window region being at higher temperature (with/without heaters)

Nuno making good progress modeling How to distinguish between end effects outside cold bore & magnet –long gradients? Tests on CAST with laser

– When install MM need system ready– Program of measurements/ definition and preparation of hardware

University institutes have specialists to advise?– Ideally Need system similar to time-domain reflectometry in cables

PATRAS Collaboration meetingYannis Semertzidis, BNL

How about spatial coherence?

x-ray refraction:

1. The x-rays/axions do not overlap

2. The x-rays travel longer paths than axions

n’

n

The important parameter here is pressure uniformity in cross section…

i

r sin

sin

i n

r n

axions

x-rays

The coherence is lost…


A numerical example For a 10m long magnet the axion/photon missing

each other by 1/2 wavelength when

65 10 rad 6sin sin

5 10 , for sin 4

i r n n ni

r n n

1eV... 180K , quite safe!

a

Tm

22 15 18

2 18 1

8

1 1.5 10 s1 1 1 5.5 10

2 2 2 7.2 10 s

5.5 101.8K

pn n

Tn


Example with 4He gas

Generalized for any ma

15 1

1.8

for 1eV, 1.5 10 s 1 0.0002

, ... 13.4Atm, at 293K

1.8Then at 1.8K, 0.082 1 0.0004 Atm

293

a p

STPp p

K

m

p p

p p

2

1.8

1eV80mb 1 0.0004

1eV

for 1eV, 0.7mK, or 0.04%

0.25eV, 12mK, or 0.6%

0.1eV, 70mK, or 4%

aK

a

a

a

a

mp

m

m T

m T

m T


Checking the temperature uniformity

• Can use a laser light to probe the uniformity, e.g. 5mK temperature gradient in the cross section, along the whole length of the magnet can produce up to 4mm shift on a red laser light…(effect goes as (1/2)2= 20002=4106).


16

Validity of CAST data

• Windows• Window heaters - history

Spots on windows discovered just before data-taking No way to monitor with all detectors installed on beam pipes ‘Wet’ TPC recently – outgassing from plexiglass

– H2O, Ar, CH4– Limit opening times VT1&2 to tracking time– Motivated move to make true differential pumping (order DRYTEL #2)

• Window heating should we turn it off? End effects penetrating into cold bore (Nuno looking into this) Will get more significant as gas density increases? Do all tests possible to provide data

– Starting this week (heaters on/off + tilting magnet) Turn off heating more frozen material accumulating on windows

– Estimate ~ 5microns H2O = 15 microns PP window As gas pressure increases self absorption in gas makes window contamination

problem less significant WHEN TO MAKE DECISION ? Now? 6 mbar (1month)?

• Systems to monitor window coatings/transmission Provision in CF for some developments in this line In meantime must make protocol for when to bake out the windows Mr Bojon and Tapio to help in calculation.


17

Effect of 1 µm ice on window

Spots on windowsWindow tranmission for given thickness in microns

Gas transmission for path length 5m

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8

Energy (keV)

Tra

ns

mis

sio

n

He 6 mbar 1.8 K

integrated axionspectrum 0-8 keVPP 15 microns

Water 1 mu

25mu Be


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Roadmap for 3He system

• End May• Complete the design report• Submit to CERN cryo-safety committee • Submit to an external referee(s) (MD hasn’t contacted them yet)• Launch any outstanding calls for tender• Conceptual design study of integration of components inside cryostat• First discussion with Central workshop the intervention at end of 2006• Final cost estimates

• June• Complete MOU to allow spending

• End June• Technical design review• Green light to start ordering system• Start execution drawings for integration of components inside cryostat

• July• Start ordering

• November• Must be ready to start intervention work

• February 2007• 3He cold windows must be ready for installation

Tapio and Nuno will organize necessary meetings and prepare the technical design report.


19

3He cold windows

• No work so far done

• My priority after CERN-Workpackages & MOU

• Provisional plan to start July 2006 (6 months available)• Order more PP15,12,13• Make 4 good spares for CAST 4He• Make several windows flanges + strongback

CERN + FREIBURG

• Make metrology to measure planarity• Glue windows• Progressive pressure tests

Check deformation of strong-back (metrology)

• Modify strong-back parameters if necessary Check deformation of strong-back (metrology)

• Cryotests and combined cryo-pressurisation tests Some modifications to cryolab test system needed

• Make and test new windows Cryolab + Panter


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Schedule

• When will MM-Line be calibrated and ready for installation?

• Can the 3He roadmap be maintained

• Should we disrupt data-taking to install MM line before November?• Yes, better to see 1 month data in 2006• Then know if there are any modifications to do during shutdown• Can synchronizes with changeover to 2-step pressure settings• Will push stoppage for 3He transition later

Will need all time we can to be ready

• Make provisional schedule assuming MM-Line ready start September


21

Provisional CAST Schedule 2006


22

Provisional CAST Schedule end 2006-end 2007


23

Planned Scientific Programme (MTP June 2005)

2004 2005 2006 2007 2008 2009 2010

LHC ExperimentsALICEATLASCMSLHCbTOTEMOther LHC Experiments(e.g. MOEDAL, LHCf)

Non-LHC Experimental ProgrammeSPSCOMPASSNA48NA60Neutrino / CNGSNew initiatives

OTHER FACILITIESADISOLDEn-TOF NeutronCASTDIRACTest Beams

North Areas

West Areas

East Hall

R&D(Detector & Accelerator)

Legend: Approved Under Consideration

PS

an

d S

PS

Sh

utd

own

NA48/3 TP; R&D requiredNA60 LoI for cont.

HIE ISOLDENew tgt; add. beamline

Rec. Expts.ILC Expts.


24

All= TPC and MM & CCD measure all pressure steps

1.5 hr per step

All= TPC and MM & CCD measure all pressure steps

Half =TPC measures half steps and CCD/MM the other half

2 mbar 14 mbar


25

Conclusions

• See Zaragoza conclusions still relevant (next slide)

• Lot of work to be done to be ready for 3He• Significant time recently spent of helping out detector groups

• Cannot continue

• Nuno (& MD) need to concentrate on 3He preparations not day-day• Need good team in SR8 to cover day-day requirements of data taking

• Looking out for potential problems

• Need detector representative at CERN • Too minimize intervention times

• Ensure good relation with experts in institutes


26

Comments on data taking in 2006

• Experience of first short data run• Loss of data taking efficiency• Disruption in run planning/pressure changing

Breakdown in hardware Non- availability of experts

• Need essential spares for key equipment• Detector pumps• Beam line vacuum pumps• Computers

• Need strategy for computer systems at SR8• Hardware problems

Some standardisation would be useful (TPC & MM)• Protection against infiltration

Juan PC is a continuing headache as it is cut off from network

• Define criterion for acceptable data at a given pressure setting• Existing = (sunrise) >90% telescope (sunset) >50%

• Fast feedback from detector fast analysis• Need a team who know the general CAST system (vacuum, He gas)

• First line of response if problems• But also to routinely follow tendencies and anticipate problems

• A comprehensive shift plan with run coordinators & shifters & general CAST team coverage

• Welcome a discussion on these points• A data taking czar appointed to coordinate these issues ?


27

Conclusions

• See Zaragoza conclusions still relevant (next slide)

• Lot of work to be done to be ready for 3He• Significant time recently spent of helping out detector groups

• Cannot continue• Nuno (& MD) need to concentrate on 3He preparations not day-day

• Need good team in SR8 to cover day-day requirements of data taking• Looking out for potential problems• Need experienced person to be data-taking czar

Little decoupled from day-day running

• Need detector representative at CERN • Too minimize intervention times• Ensure good relations and contact with experts in institutes


28

patras collaboration meeting 1 status in sr8 martyn davenport 22.05.06

Documents

cast cern

cern inadequate

monthsstart of data

shift cernwide power

ccd computer munich

mmwhen ccd telescope

line elements compatibility

ccd h2 bubbles