During week 24-29/11 the INFN team did the local shielding of TOF1, rebuilding completely the detector in situ with a new support system.
Local shielding is done with ARMCO plates in a way similar to TOF2.
During operation only a PMT was found broken and replaced (channel # 60).
In the new configuration downstream scintillator bars are horizontal.
The upgrade was completed succesfully without major problems. A MICE note describing the intervention will soon be provided.
Although the summary says that the report on CM40 is by Ken Long it is not obvious on the news item.
CM40 in Rome was a resounding success. Progress on all aspects of the project was excellent; I’ll pick out only a few of the highlights:
• The two remaining Step I papers, the performance of the EMR in the MICE Muon Beam and the determination of the pion contamination in the beam, are both proceeding well. Wise persons for both papers have been appointed. Victoria will coordinate the efforts of the authors with the oversight and advice of the wise persons to bring the papers to the collaboration in as short a time as possible;
• All the equipment required for Step IV is now available. FC2 has essentially met its acceptance criteria, making it no longer necessary to consider operations at Step IV with de-rated focus coil currents. The remaining issue for Step IV is the completion of the partial return yoke. While the material has been delayed by a typhoon in the Pacific, Alan Bross, Roy and the project team are making arrangements to expedite its manufacture and installation;
• The “Data Block Challenge” has delivered the first end-to-end simulation, followed by the reconstruction, of the experiment. This is a substantial achievement and Ryan and the team deserve congratulations. Gremlins and other issues have been identified and while the data sets produced in the first Data Challenge are unlikely to be long lived, the analysers can now interact with the software developers to make the discipline of working on “official” simulation and reconstruction data sets a more easy and straight-forward affair; and
• The planning of Step IV operations is becoming more robust with carefully prepared commissioning and running plans being discussed. Careful planning is essential if we are to deliver the Step IV physics programme despite the pressures on the Step IV running period coming from the integration of the equipment needed to carry out the cooling demonstration.
Discussion of the revised configuration by which the collaboration can demonstrate, and study, ionization cooling was a feature of the meeting. The contributions to the dedicated plenary session devoted to the topic were excellent and represented the summary of outstanding contributions by all of those involved. To choose between the reference and alternative lattice the following, priority ordered, criteria have been defined:
1. 4D emittance reduction; transmission/scraping:
• Since the simulations to date have not included a full simulation or reconstruction of the experiment it is essential that the configuration we adopt produces a 4D cooling effect that is measurable and can be studied systematically.
2. 6D emittance reduction:
• The largest change in 6D emittance presented at the CM, with an appropriate/careful phase-space selection, was at the 1% level and the excursions in the 6D emittance as the beam propagated through the experiment were significantly greater that 1%. A large amount of data may have to be integrated to measure such a small effect. Therefore 6D emittance reduction is a desirable, rather than an essential, criterion.
3. Lattice cell:
• MICE was approved to demonstrate a “realistic” section of cooling channel. Ideally the cell, or section, that we construct should be capable of being incorporated in an extended cooling channel. This implies appropriate matching criteria. In developing the lattice the criterion that the cell be capable of being incorporated in a section of a lattice cell is a desirable characteristic.
The papers for the review of the experiment which will take place on the 24th and 25th November at RAL have been prepared (http://micewww.pp.rl.ac.uk/projects/governance/wiki/2014-11-24-Review). The reference lattice (shown in the figure below) has been shown to have superior 4D performance and better transmission. Each of these properties can be traced to the evolution of the beta function as a function of position along the channel. The performance of the reference and alternative in 6D is being checked. So, subject to the checks on the 6D phase-space evolution that are presently being performed, the reference lattice will be adopted.
At this week’s video conference the contents of the papers submitted to the November review of the experiment will be summarised. In addition, the status of the analysis of the reference and alternative lattices will be presented.
A note from Chris Rogers¶
I proposed holding a "kick-off" meeting for the "Description of MICE Step IV" paper. I propose holding this at RAL the day after the MPB in order to help international colleagues to attend. This is Wednesday 26th November. Could you please let me know if this is a problem. Proposed agenda is here:
A phone connection will be available. I will need to find a room reasonably soon, so do let me know if this date/location does not work out for you.
Accelerator Open Day¶
The laboratory is holding an accelerator open day for students on November 26th. MICE has been asked to be involved. There will be a poster session and tours. Half the students will look at posters, while the other half make a number of visits, including one to the MICE hall. Then halves will then reverse. Thus we need to provide at least one person to man the poster, while a second person leads the tour of the hall. We also need some suitable posters. I am looking for volenteers as guides and for the posters. I am also looking for suitable posters, either existing or for someone to prepare one or more specially for the day. Please respond to Paul.Kyberd@brunel.ac.uk.
Focus Coil 1 arriving in the Hall. Friday 20th June
On Friday Focus Coil 1 was moved to the hall
Report from analysis group¶
- FC1 field mapping: Data taking is now completed in solenoid and flip mode, and the magnet remembers
training in both operating modes.
- Paper in progress: "Pion contamination in the Step I beamline," status will be updated at CM39
- Paper in progress: "EMR commissioning," status will be updated at CM39
Focus Coils - good news.¶
After dismantling the field mapping equipment this morning, FC#1 immediately ramped up to 186.5A
in Flip mode before quenching, thus showing it remembers its training after mode changes.
We’ve subsequently made the snap decision to warm up over the weekend and get FC#2 cooling as soon as possible.
Also, FC#2 was leak checked today and showed not to have deteriorated significantly as a result of
the recent reparations at Tesla.
Hall Summary, 4th June 2014¶
• Decay solenoid: new PSU in position, connections will start on Monday to allow start of commissioning – manufacturers arrive on 23rd June for final phase
• D2 PSU, which had to be moved, will also be reconnected Monday
• RR2 making good progress, concentrating on power distribution boards and cabling thereto, error with battery frame location will be corrected next Tuesday
• FC1 field map in flip mode complete, solenoid map in progress
• FC2 is being pumped down OK
• Vacuum hardware installation begins on Monday
• Downstream SS baseplate ready to be collected and modified by outside company (for compatibility with PRY)
• West mezzanine load test successful, deflection with design limits. Compressor frames now mostly built
• R78 target off for a couple of days, Paul Hodgson informed
Hall Summary, 21st May 2014¶
- delayed because of problems with the news site
• Decay solenoid: successfully powered to 870 amps, QD tests complete, PSU will be swapped over next two weeks, then commissioned by manufacturers
• Automated proton absorber installation complete and tested and DSA closed
• D2 now back in position
• PRY bases delivered this week
• Distribution board and trunking installation making good progress in RR2
• Additional electrical technician employed w.e.f May 19th
• CERN field mapping gear is at RAL
• FC1 mapping begins 3rd June
• FC2 delivery (take two) on 23rd May
• Problem with target chiller now fixed
• Raised frame target run negated by above, will be repeated
• West mezzanine load test scheduled for May 30th, then wiring and compressor placement can go ahead
• European Cryogenics Group tour of R5.2 on 29th May
• Activation run on 27-29th June
R78 test S1.8 has exceeded 3.2M actuations and is performing as expected.
The first Solenoid is in the Hall¶
The first solenoid was moved into the MICE hall last week.
images in the Photo Album
Spokesman's update on Recent reviews of MICE¶
The technical successes across the project, the substantial improvements in organisation and the beginnings of effective preparation for operations at Step IV were all recognised and commended at last week’s reviews. As I write, the upstream solenoid, with tracker inside, is in the Hall on its stand (see the MICE photo repository), the downstream solenoid is in R9 awaiting the installation of the second tracker and the focus coil is being prepared for field mapping. We’re on our metal to deliver Step IV and, after all the years of preparation, the pressure to deliver is welcome.
The RLSR Panel and MPB discussed the programme needed for MICE to be scientifically and technically successful. In the MPB’s words (see the MPB site on MICEmine):
“MICE has 3 strategic technical and scientific goals. Demonstrate:
1) physical understanding of ionisation cooling with re-acceleration
2) technology of components integrated into an experimental arrangement
3) a working Neutrino Factory module
Goals 1 and 2 need Step V. Only goal 3 requires Step VI.”
We are all aware of the significant pressures on budgets across the collaboration and of the need to make best use of the tax-payers’ resources that we have been granted. In view of the budget pressures and the fact that Step V will allow the critical technology to be demonstrated and cooling with reacceleration to be measured, the MPB concluded that it did “not support proceeding to Step VI”.
The MPB also recommended that MICE “…explore all options for advancing the milestone for completing the installation of Step V in 2017.” This recognises the scientific and technical importance of Step V. Such an expedited Step V programme will reduce the total project cost (TPC). Clearly the continued, sustained and stable support of the funding agencies is vital for us to be able to deliver Step V on this expedited timescale. Initial steps towards the necessary negotiations with the funding agencies are in hand and Roy has initiated a review of the schedule.
Preparations for Step V are going well: the coupling coil remembers its training; the single-cavity test is being prepared; the RF-power amplifier refurbishment work is going well; the second LH2 absorber is on its way from Osaka; and the second focus coil will be returned to RAL from TESLA later this month.
Step IV is critical; only at Step IV shall we be able to study the cooling properties of LH2 and LiH, the materials that have been proposed for use in the cooling channel at the Neutrino Factory and Muon Collider. With continued hard work, attention to detail and focus we can bring the Step IV build to a successful conclusion, paving the way for success in Step IV operations and laying the foundations for the critical demonstration of ionization cooling with reacceleration at Step V.
Summary of the hall meeting¶
• Decay solenoid – compressor shaft seal changed again, cleaning system this week, hope to begin cooldown again on Friday 9th May
• Activation run likely in June – ISIS will give one week’s notice
• SS2 now in R5.2, aim to position in offline location on Friday 9th May
• SS1 is in R9
• Revised ODH plan for R5.2 to be complete for ISIS/MICE safety meeting on May 30th
• Dedicated services meeting on May 13th – priority will be layout of magnet cabling and compressor hoses
• Weekly phone meeting with DL established to expedite electrical work
• Survey work requested: PRY base fixings; tracker in SS1, FC1 field mapping gear
• Refit of MLCR underway
• Plan in hand to replace unreliable network switches
• Light curtain for PPS on order – one month delivery – ISIS are approving circuit mods
• Major parts of vacuum system now being installed in R5.2
• FC stable at 180amps for 48 hours, but quenched at end of run – not thought to be fault with magnet
• Mapping gear for FC1 about to be shipped from US
• FC2 due at RAL May 19th, FC1 still the baseline for Step IV
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