G 0 Project Coordinator Report Joe Grames “Big Picture” Schedule Preparations Polarized Source Injector Accelerator Hall C Accelerator Plans for 687 MeV Run

Firm Pre-G0 Schedule Today – Jan. 26, Winter Shutdown Tasks Jan. 27 – Feb. 5, Restore & G0 Setup for 687 MeV & 362 MeV Feb. 6 – March 14, Physics Program for Hall B & A Scope of Work Firm G0 Running Schedule Mar. 15 – Apr. 2, Commissioning Period (following long down) Apr. 3 - Apr. 29, High Q 2 Run (687 MeV) (3-halls, all polarized) Tentative G0 Running Schedule Jul Sep. 1, Low Q 2 Run (362 MeV) (1-pass, 1-linac, 2-halls) Sep Dec. 22, High Q 2 Run (687 MeV)

Polarized Electron Source Layout Photocathode Gun 2 Anodized Superlattice P > 780 nm QE ~ % I beam ~ 80  A Laser Ti:Sapphire (780 nm) f ~ 499 MHz Parity Quality Laser Setup G 0 Helicity Sequence Pockels cell alignment IA intensity FB Rotatable ½-waveplate Insertable ½-waveplate

Superlattice Polarization & Gun2 Lifetime Polarization ~86% Lifetime ~130 C A = 20  A B = 5  A C = 80  A ~10 C/day

Laser Table Layout for 3 Halls High Polarization (courtesy, J. Hansknecht)

Injector Matching HC position differences are generated at the source. “Matching” the beam emittance to the accelerator acceptance realizes damping, Well matched beam => position differences reduced. Poorly matched beam => reduced damping (or even growth). Accelerator matching (linacs & arcs) routinely demonstrated. Injector matching has been arduous, long (~2 year) process. X-PZT (Source) Y-PZT (Source) X-BPM (mm)Y-BPM (mm) 1C-Line X-BPM (mm)Y-BPM (mm) 1C-Line without with

ExperimentPhotocathode Charge Asymmetry at TargetPosition Difference at Target SpecAchievedSpecAchieved HAPPEX-I Strained 1 ppm0.4 ppm10 nm HAPPEX-He Superlattice 0.6 ppm0.08 ppm3 nm HAPPEX-H Superlattice & Strained 0.6 ppm2.6 ppm2 nm8 nm HAPPEX-He (2005) Superlattice 0.6 ppm?3 nm4 nm (x) 17 nm (y) HAPPEX-H (2005) Superlattice & Injector Match 0.6 ppm0.2 ppm2 nm1 nm (x) 1 nm (y) G0 requirements => <2 ppm <40 nm Superlattice Photocathode for Parity Experiment

Injector HC Position Feedback Helicity Magnets HM (electron beam) replace PZT (laser beam) 4 magnets => position (x,y) & angle (x’,y’) linear over desired region independent electrically Isolated orbit correction in each state corrleated charge asymmetry 100x better than PZT resolution 100 nm => 10 nm (at 5 MeV)

PZTBooster Concept Matching “Standard” injector matching process Time consuming (1 shift + 2 days + 1 shift) 30 Hz PZT at source yields small signal Helicity Magnets in new “Optics Mode” Synchronous with 30 Hz BPM acquisition system Mimic small signal to deliver large signal Goal: Streamline injector matching Improve accuracy of result Allow for rapid confirmation Direct comparison between Accelerator & Physics results for damping and response matrix for feedback.

Hall C Accelerator resources re-allocated in February for final 3C line work: move Moller quad => low energy polarimetry arrange quadruplet optics +> spot size (halo?) control install shielded beam pipe => HKS stray field independence install Halo & G0 girders w/ improved mating to G0 spectrometer Acclerator resources are largely allocated to the accelerator for the winter shutdown, with the exception of: Install Moller kicker to allow high current polarimetry

687 MeV Run Efforts shift to “hot checkout”, commissioning plans & safe operations. Jan 2 – Jan 16 : Source & Laser Table setup Jan 17 – Jan 21 : G0 Laser Table setup Jan 22 – Jan 26 : Machine checkout & PSS Certifications Jan 27 – Feb 5 : Machine restoration & G0 Tasks (9) - 56 MeV Injector Restore (Dec.’05) (1) – PQB source checkout 100 keV, possibly higher (6) – Setup T=5.0 MeV & 36.6 MeV injector & “lock-in” (1) – Injector Match Part 1 (PZT acquisition) (2) – 5-pass machine beam 650 MeV/pass (1) – Machine repair on DAY (2) – 1-pass 687 MeV to BSY & ½-pass 362 MeV => SAVE (1) - Injector Match Part 2 to BSY 687 MeV => SAVE (2) – Full PQB, Source to BSY (2) – 5-pass machine setup 738 MeV/pass Feb 6 – Mar 14: Physics Program resumes (B 6 th and A 24 th ) Mar 15 - Apr 29: G0 (commissioning & production) at 650 MeV/pass