MICE update 25 July 2015
Data taking and operations:¶
ISIS Cycle 2015/01b ended yesterday. During the night of 24Jul15, the experiment was operated successfully with 100A in the downstream spectrometer solenoid. As you’ll have seen from Chris Rogers’ email, helix tracks were observed in the downstream tracker. In the first attachment you’ll find the event that Chris circulated.
The first helical track is the tip of the iceberg in terms of the work that it took to get here.
Over the past month there has been an enormous effort by the US magnet team. Led by Mark Palmer and Alan Bross the team were able to start the training of the downstream solenoid and to bring it into stable operation at 100A for the data taking during the night of 24Jul15. On Friday, 24Jul15, SSD achieved 190A — around two thirds of the operating current.
My congratulations, and thanks, to Maria Leonova and Sandor Feher and all of the magnet team. In particular Pierrick Hanlet has made an enormous effort to serve the controls needs of the magnet commissioning while keeping an eye on the experiment as well.
The Operations team too; ably coordinated by the MOMs Ryan Bayes and, in the last few days, Paul Hodgson has worked hard to keep the experiment going in a period when the daily changes in schedule were challenging. More over, the reconstruction, and first analysis of the data, was completed in less than 24 hours; this is an important capability and one which we will sorely need as we go forward in Step IV. My congratulations, therefore, to the Operations, S/w&C and analysis teams.
Progress has also been made on the mechanical alignment of the trackers using the field-off data collected in Cycle 2015/01a. For information I attach plots of the comparison of position and slope of the tracks between the upstream and downstream trackers prepared by Chris Hunt. There is still much to understand in the data, however, with the field-off and field-on data combined, I believe we have a good basis for studying the magnetic alignment of the experiment.
We have much to look back on with satisfaction. However, the last few weeks were not without some challenges, particularly in terms of carrying out the operations necessary to commission the magnets.
Permission has been granted to operate the magnets at Step IV. To gain permission to operate, procedures and responsibilities have been discussed and agreed between MICE and ISIS. Now that Cycle 01b is complete, and first data with field has been taken, it will be necessary to review and refine the procedures to make sure they are fit for purpose and are able to guarantee safety while allowing efficient working. This process will begin first thing next week.
During the preparation for training, a fault was discovered in the upstream solenoid. The magnet is presently being warmed up to allow the spectrometer-solenoid team to inspect the warm feedthroughs where the problem is expected to be. The remedial work necessary to bring the magnet back online will be given priority with a view to starting the cool-down of the upstream solenoid in the second week of August.
Once the repair has been effected and the MICE Hall prepared for continued magnet training, the commissioning of the spectrometer solenoids will recommence and the focus-coil commissioning will begin. The timescales are such that it is likely that a portion of Cycle 2015/02 will be required for magnet training. While this is regrettable, it is now important to consolidate our procedures and our expert teams. If we can do both of these things effectively over the coming month or so, we will be in a much stronger position to execute our data-taking campaign for Step IV.
Over the coming weeks the project, operations and analysis teams need to work together to revise the operations programme for Cycle 2015/02 and beyond. 24/7 shift cover will be necessary to provide support for commissioning and operations and, of course, for data taking. So, please do respond to the request made by Paul Kyberd to volunteer for shifts in Cycle 2015/02.
And finally …¶
A lot has been accomplished and much valuable experience has been gained. It is now important to learn from that experience to build the platform on which we can stand to deliver Step IV.