MICE status

Mice layout

Beam line elements (including channel magnets)

Detector components

Civil Engineering

Software

target

Decay Solenoid

Beam Stop

Tracker and solenoid

TOF0

Target Beamline Elements

Shaft – magnetically suspended.Kicked into the beam be electromagnets and then pulled back out. (80g)

ChallengesDeliver the acceleration – current, magnetic field, coolingBearings – in vacuum – no lubricant.

Failure compromises ISIS running.

StatusAcceleration solved, can intercept one pulse of the 50Hz from ISIS and be clear by next injection.

Bearing – problems.

Two targetsOne is ISIS providing beamOne outside ISIS running ahead by a factor three to “prove” to ISIS not going to fail

It failed after 340,000 activationsWear on the shaft led to debris in the bottom bearing and the shaft jammed. Search Currently for cause of problem

Jacking mechanism to allows ISIS to run, but debris in the vacuum chamber is a problem

Must remove this sharp edge

DLC removed from lower bearing

Ditto upper bearing

Effects of seizureOn target bearings

Beamline ElementsTarget Wear

Target Beamline Elements

Shaft – magnetically suspended.Kicked into the beam be electromagnets and then pulled back out. (80g)

Clear signs of wear

Coating of diamond like carbon thinner than previouslybut no sign of bubbling or delamination

Wear on one sidebut mechanical alignment well within tolerances

electromagnetic alignmentmagnets are all functionalcoils are all workingpossibility of partial damage or loss of fields being

investigated

Size of force needed to distort the bar being investigated by FEA

can acceleration distort bar.Finished by ??

Needed for Beam

TargetMagnets

Beamline Elements

1 3 5 7 9

11

13

15

17

19

21

23

25

27

29

31

33

35

37

39

41

S1S2S3S4S5S6S7S8S9S10S11S12S13S14

Axial position

Azimuth

Magnetic field (mT)

800-900

700-800

600-700

500-600

400-500

300-400

200-300

100-200

0-100

-100-0

-200--100

-300--200

-400--300

-500--400

-600--500

-700--600

-800--700

-900--800

-1000--900

Measurements last Friday on one permanent magnet (very preliminary)

Home built setup – measure 1600 points (manual). Step size 9 degrees in phi. 0.1mm in z. Estimated accuracy 5 milliTesla..

Tribology Beamline Elements

Discussions with tribologist at Sheffield have suggested a number of possiblities.

The first point was the fact that shaft and bearings are both covered with diamond like coating is seen as a disadvantage. Surfaces of the same material are more likely to stick and rub.

Bearingelectro-polish after wire erosion and then cover with

Chromium-nitride.

or

apply eletroless Nickel-Phosophorus coating. Chemical coating means the bearing could be a simpler two piece bearing instead of quadrants

Shaft

Electro-polish – look at changing to a Titanium Alloy with better mechanical properties, but need to check radiological implications

Cover with a nitride coating before the Diamond Like Graphite. Makes the surface stiffer as well as harder.Ideas, and

progress, but no firm timnescales

Decay Solenoid

Beamline ElementsSuperconducting SolenoidCaptures muons from pion decay.Increases event rate by a factor close to 10 (according to calculations)Won’t superconduct

Open the magnetRemove the solenoid opens a hole into the vault.Withdrawing all the cold mass

Moving dipoleLifting out quadrupoleTaking down the wall

Best EstimateSimple Heat leak Repair during October shutdownCoil 10 ½ cold mass out at Christmas

Don’t have to take down wall

Worst CaseCoil 10 irrepairable – link out and run with 9 coils

Synchrotron vault Withdraw D2

DSA wall

Polyanna outcome

Decay Solenoid

Beamline Elements

Finished by first run 2009.Needed for muon flux

Withdraw D2

Re-install rails

Remove part of Shield wall

Spectrometer Solenoids

Beamline Elements

Spectrometer SolenoidsProvide the field for the trackers to allow measurement of particle trajectory and calculation of beam emittance

Delivery delayed but discover of problem with helium venting in the case of a quench. Problem solved, needs modification to solenoid 1, different parts for solenoid 2. Finishing Solenoid 2 first, then correct 1.

Delivery to Fermilab of first one, October 2008.Measurement of field using the zip tracker.

Delivery to RAL – late 2008, early 2009.Integration and safety tests two months.

Ready to run March 2009.Beam characterisation (momentum and emittance) in different running conditions.

Busy until delivery of the second solenoid later in 2009.Measure emittance before and after cooling

Before RF delivered can look at “heating” produced by an absorbers

(Heating = emittance – absorber – emittance)

Finished by end Feruary 2009Needed for heating/cooling measurement

Future Beamline Elements

Focus Coils

Second design review with Tesla next month.

Coupling Coils

Production continuing in HarbinDelayed – effect on MICE unclear.

Hydrogen system

Hazop safety reviews in October.

Coupling Coils

Focus Coils

HydrogenCavities

PID Detector

TOF0

In position – producing signals – preparing to calibrate

TOF1

Delivery by the 20th October

Cerenkovs

Installed and running

KL

In place – need beam in the hall to check out and calibrate

Tracker Detector

Subject of a detailed review by Malcolm Ellis.

LiH Detector

Containers have been finished by CERN/Geneva.Heard from CERN today they are now shipping to RAL.

LiH itself is being organised by Alan Bross.

Andy Nichols is working on safety and Risk Assessment together with method statements.

Expected by the end of ‘08

Arriving well before the second spectrometer solenoid

End 2009Needed for heating/cooling measurement

RF Detector

Cern Amplifiers are finished

Daresbury finished by December – completes phase 1

RF infrastructure project (from amplifiers to cavity)review in October – progress on understanding the details of

the tasks which need to be complete

Orders have been placed for cavities which are long lead items.

Final design review October

Beam Stop Civil Engineering

Allows access to the hall while beam is running in the synchrotron.

Allows us to rapidly put beam into the MICE channel when work in the hall is finished

Shield Walls Civil Engineering

CE Schedule Civil Engineering

North shield wall started.

False flooring imminent

Hall cleared by the end of November

Software Software

OnlineFocussing on the online reconstruction, with TOF applications already used in the control room to reconstruct beam profiles and time of flight.. Last week made contact with Atlas centre to start data transfer to tier1 for backup and distribution.

Tests with the reconstruction of the tracker 1 with cosmic ray data. → We should be able to reconstruct about 300-400 events per second with the new online cluster

Work on G4Mice by Chris Rogers

Beam Physics

Electron Beam

Last weekend we established an electron beam into the DSA.

Allows us to improve the PID algorithms by running electrons into the calorimeter (low energy so little else gets through and none of that at c)

Gives us a clock to calibrate the TOF counters.

Running target is mundane (not expert last weekend).Running DAQ and online monitoring is becoming so.

We have a running experiment, into which we are integrating the parts

Unfortunately some major parts remain to be integrated