# Presentation: 328288

## Phobos Magnet Status 

- Leslie Rosenberg & Patrick Decowski, MIT
- Technical Advisory Committee
- November 1998

## Magnet Design

- Phobos Magnet is:
- Double dipole
- Resistive coils
- 2 Tesla in spectrometer
- Low Field outside of spectrometer

- 100 MeV/c

- 1 GeV/c

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## The Phobos Magnet @ Danfysik

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Manifolding

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## More Manifolding

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Coils

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Factory Acceptance Tests

- Factory Acceptance tests were conducted on Oct 1 & 2 @ 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!

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Magnet Arrival @ BNL

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## 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

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Magnet Stand Design

- Tie-down to the tunnel floor

- Horizontal
- Movers

- Vertical
- Adjustment

- Top View:

- Side View:

- Bolts screw into
- bolt holes in yoke

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Field Mapping

- By field in y=0 plane

- Max. absolute By gradient

- Determining number of points for field map:

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Field Mapping II

- Trajectories
- of probe

- By 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

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## Schedule

- Nov 3: Magnet arrives @ BNL
- Nov 3 - Dec 2: Commissioning of magnet @ AGS:
- Assembly of components
- Interlock sensors
- Manifolding & Buss-bars
- B-field and mechanical tests @ full power
- Dec 7: Move magnet to RHIC
- Dec 8 - 18: Commissioning of magnet @ RHIC
- Power and cooling
- Hook up with RHIC controls
- Dec 21 - Jan 29, ‘99: Mapping of magnet
- AGS magnet mapping group

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98

## 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

- Leslie J. Rosenberg, MIT;  Phobos TAC Review

- Nov. '98