Commissioning Results of Superconducting Magnet System for the Neutrino Beam Line
The first commissioning of a magnet system for the neutrino beam line in the J-PARC has been performed from January to March, 2009. The magnet system could be cooled down successfully in 9 days. RRRs of all the magnets and joint resistances in the magnet string were measured to be reasonable values. The magnet string composed of 28 superconducting combined function magnets could be excited up to 5000 A after several shutdown tests without a spontaneous quench. A quench protection scheme with a magnet safety system developed by CEA/SACLAY were verified to work properly. As for beam commissioning, the proton beams could pass through the arc section including the superconducting magnet string on the first attempt, and the magnet protection system were verified to work quite well even in a beam induced quench test.
Progress and Prospect of Superconducting Magnet Systems in J-PARC
The construction of the 1st phase Japan Proton Accelerator Research Complex (J-PARC) was completed. Three major experimental facilities, which have been utilized by users, are instrumented with the superconducting magnet systems; a muon transport solenoid in Materials and Life Science Experimental Facility, a superconducting spectrometer in Hadron Experimental Facility, and a 150 m superconducting beam line in Neutrino Experimental Facility. There are also several superconducting magnet systems proposed as part of future experiments at J-PARC. The paper briefly summarizes the current status of the superconducting magnet systems currently in operation, and introduces the superconducting magnet systems associated with the new proposals.
“To those who choose to follow in our footsteps”: making women/LGBT+ soldiers (in)visible through feminist “her-story” theater
Building on Judith Butler ’ s understanding of visibility as “ the object of continuous regulation and contestation, ” art/aesthetics studies in international relations, and feminist theater studies, we identify feminist “ her-story ” theater as a unique site where Western “ gender-/sexuality-inclusive ” soldiering is visibilized, contested, and subverted. Drawing on ethnographic observations of two award-winning dramas, interviews with artists and military hosts, and ﬁ ndings from a wider research project on contemporary British military culture, we reveal the key role of heteronormative and patriarchal cultural discourses in reproducing the ambivalent positionalities of women/LGBT+ soldiers. We argue that the very visibility of women/LGBT+ soldiers on the stage paradoxically operates to make the complexities of – and struggles against – masculinized heteronormative military cultures invisible. Furthermore, despite artists ’ attempts to dissociate empowerment through soldiering from the problematic context of modern con ﬂ icts, “ her-story ” theater ultimately entrenches gendered/racialized hierarchies that normalize Western military interventions. We conclude that only through sustained feminist re ﬂ ection on the contours of “ imagined ” futures of female/ LGBT+ soldiering can this persistently problematic (in)visibility be productively disrupted.