Phobos Magnet Status Leslie Rosenberg & Patrick Decowski, MIT Technical Advisory Committee November 1998.

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Presentation transcript:

Phobos Magnet Status Leslie Rosenberg & Patrick Decowski, MIT Technical Advisory Committee November 1998

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review2 Magnet Design Phobos Magnet is: –Double dipole –Resistive coils –2 Tesla in spectrometer –Low Field outside of spectrometer 100 MeV/c 1 GeV/c 100 MeV/c ++  - adjustable separation --

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review3 The Phobos Danfysik

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review4 Manifolding

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review5 More Manifolding

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review6 Coils

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review7 Factory Acceptance Tests Factory Acceptance tests were conducted on Oct 1 & Danfysik Voltage drop, Pressure drop, Temperature rise were measured. All according to Specs At 1/7 of the nominal magnet current: –B = 0.4 T in center –Field is uniform, no surprises No measurable deflection at this reduced current setting. Magnet passed Factory Acceptance tests!

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review8 Magnet BNL

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review9 Safety Review The Phobos Magnet was reviewed by the Safety Commitee in Feb. ‘98: –Some action items arose, a response to the action items was submitted to the Safety Committee –We are working with J. Scaduto to generate procedures for operating the magnet. These will be refined while the magnet is at the AGS Magnet Stand was designed : –Seismic tie-down (action item from the safety review) –3-axis adjustment

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review10 Tie-down to the tunnel floor Magnet Stand Design Horizontal Movers Vertical Adjustment Top View: Side View: Bolts screw into bolt holes in yoke

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review11 Field Mapping B y field in y=0 plane Max. absolute B y gradient Determining number of points for field map:

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review12 Field Mapping II Trajectories of probe B y field weighted by the gradient Strategy: –measure one arm in detail, other in a few points, use symmetry –45 deg trajectories –3cm spacing between trajectories (40 trajectories) –B measurement every 1cm along trajectory –3cm vertical spacing (5 planes in gap) 1 trajectory ~ 1/2 hrs 40x5x0.5 = 100hrs for one current setting

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review13 Schedule Nov 3: Magnet BNL Nov 3 - Dec 2: Commissioning of AGS: –Assembly of components –Interlock sensors –Manifolding & Buss-bars –B-field and mechanical full power Dec 7: Move magnet to RHIC Dec : Commissioning of RHIC –Power and cooling –Hook up with RHIC controls Dec 21 - Jan 29, ‘99: Mapping of magnet –AGS magnet mapping group

Nov. '98Leslie J. Rosenberg, MIT; Phobos TAC Review14 Summary Phobos Magnet is on-track! Magnet is delivered to BNL Full power tests will be conducted at the AGS this month The magnet will be moved to RHIC in early December Magnet mapping will start in January