On Thursday and Friday we fully trained 12 new shifters and 3 additional partially trained shifters.
Many contributed to the training; I would like to thank:
- Chris Rogers for initial preparations
- Rose Hayes for arranging RAL inductions
- Henry Nebrensky for general invaluable help and assistance in organization
- Chris Heidt, Adam Dobbs, Rhys Gardener, Ed Overton, Henry Nebrensky, John Govans for shifter training
Several things were learned from shifter training by the experts and these will need to be resolved before the next
training session; the MOM and Steve will address them.
Bravo to all involved and on to Step IV data taking!
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.
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