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 transcript:

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: GeV Major engineering design completed Drafting work in progress. Construction to start in Jan 2009, finish by summer 2009

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

PREX Mtg, July 2008R. Michaels, JLAB Parameters of Septum B = T L eff = 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

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

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

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

PREX Mtg, July 2008R. Michaels, JLAB

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

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

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 GeV

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

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

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

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

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

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

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

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

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