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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