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PREX Mtg, July 2008R. Michaels, JLAB Warm Septum : Status Septum Team: Kees deJager, Paul Brindza, Javier Gomez, John Lerose, Al Gavalya, & me New Design.

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Presentation on theme: "PREX Mtg, July 2008R. Michaels, JLAB Warm Septum : Status Septum Team: Kees deJager, Paul Brindza, Javier Gomez, John Lerose, Al Gavalya, & me New Design."— Presentation transcript:

1 PREX Mtg, July 2008R. Michaels, JLAB Warm Septum : Status Septum Team: Kees deJager, Paul Brindza, Javier Gomez, John Lerose, Al Gavalya, & me New Design choice: 5 0 New energy for PREX: 1.05 0.05 GeV Major engineering design completed Drafting work in progress. Construction to start in Jan 2009, finish by summer 2009

2 PREX Mtg, July 2008R. Michaels, JLAB Septum Magnet target HRS-L HRS-R collimator

3 PREX Mtg, July 2008R. Michaels, JLAB Parameters of Septum B = 0.458 T L eff = 0.873 m N = 380 turns, I = 500 A, NI = 190,000 Amp-turns V = 108 Volts, P = 54 kW 0.4 T-m A pair of dipole magnets right after the target  Extends spectrometers to 5 0

4 PREX Mtg, July 2008R. Michaels, JLAB Collimator Septum Magnet Top view

5 PREX Mtg, July 2008R. Michaels, JLAB View from Target Beam Hole Iron Coils Vacuum

6 PREX Mtg, July 2008R. Michaels, JLAB Zoom View from target Issue: How tight a beam hole ? Beam Presently 0.75 0 Copper Coils HRS – L HRS – R Hard limit 1.3 0 (valve) More coils = higher B field for Makis Checking radiation load (Pavel)

7 PREX Mtg, July 2008R. Michaels, JLAB

8 PREX Mtg, July 2008R. Michaels, JLAB Focal Plane X-Y Distributions

9 PREX Mtg, July 2008R. Michaels, JLAB Change in our Acceptance Model

10 PREX Mtg, July 2008R. Michaels, JLAB At 5 0 the new Optimal FOM is at 1.05 GeV (+/- 0.05) (when accounting for collimating small angle, not shown) 1% @ ~1 GeV

11 PREX Mtg, July 2008R. Michaels, JLAB Collimation : define acceptance, cut some low angle (Paul Souder, et.al.)

12 PREX Mtg, July 2008R. Michaels, JLAB Systematic: Location of Collimator no problem, go back to sleep …

13 PREX Mtg, July 2008R. Michaels, JLAB Reduction in Error from Detector Segmentation (Paul Souder) ( 1 st Order Transport )

14 PREX Mtg, July 2008R. Michaels, JLAB Reduction in Error from Detector Segmentation Neutron Radius of Lead

15 PREX Mtg, July 2008R. Michaels, JLAB Analysis of Real Data to find A T Strategy (Paul Souder) Old Septum

16 PREX Mtg, July 2008R. Michaels, JLAB Analysis of Real Data … Focal Plane Distributions Lead Elastic, 1.1 GeV, 6 0 Old Septum

17 PREX Mtg, July 2008R. Michaels, JLAB Same for R-arm

18 PREX Mtg, July 2008R. Michaels, JLAB Analysis of Real Data to find A T Strategy (Paul Souder) New Detector ?

19 PREX Mtg, July 2008R. Michaels, JLAB Warm Septum : Summary New Design choice: 5 0 New energy for PREX: 1.05 0.05 GeV Major engineering design completed Drafting work in progress. Construction to start in Jan 2009, finish by summer 2009

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