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G 0 Project Coordinator Report Joe Grames. “Big Picture” Schedule Preparations Polarized Source Injector Accelerator Hall C Accelerator Plans for 687 MeV Run. Scope of Work. Firm Pre-G0 Schedule Today – Jan. 26, Winter Shutdown Tasks

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slide1

G0 Project Coordinator Report

Joe Grames

  • “Big Picture” Schedule
  • Preparations
  • Polarized Source
  • Injector
  • Accelerator
  • Hall C
  • Accelerator Plans for 687 MeV Run
slide2

Scope of Work

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

Firm G0 Running Schedule

Mar. 15 – Apr. 2, Commissioning Period

(following long down)

Apr. 3 - Apr. 29, High Q2 Run (687 MeV)

(3-halls, all polarized)

Tentative G0 Running Schedule

Jul. 21 - Sep. 1, Low Q2 Run (362 MeV)

(1-pass, 1-linac, 2-halls)

Sep. 22 - Dec. 22, High Q2 Run (687 MeV)

slide3

Polarized Electron Source Layout

Photocathode

Gun 2

Anodized Superlattice

P > 80% @ 780 nm

QE ~ 0.5-1.0 %

Ibeam ~ 80 mA

Laser

Ti:Sapphire (780 nm)

f ~ 499 MHz

Parity Quality Laser Setup

G0 Helicity Sequence

Pockels cell alignment

IA intensity FB

Rotatable ½-waveplate

Insertable ½-waveplate

slide4

Superlattice Polarization & Gun2 Lifetime

Polarization ~86%

Lifetime ~130 C

A = 20 mA

B = 5 mA

C = 80 mA

~10 C/day

slide6

Injector Matching

X-BPM (mm)

Y-BPM (mm)

without

X-PZT

(Source)

1C-Line

1C-Line

with

X-BPM (mm)

Y-BPM (mm)

Y-PZT

(Source)

1C-Line

1C-Line

  • 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.
slide7

Superlattice Photocathode for Parity Experiment

G0 requirements => <2 ppm <40 nm

slide8

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)
slide9

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.
slide10

Hall C

  • Acclerator resources are largely allocated to the accelerator for the winter shutdown, with the exception of:
    • Install Moller kicker to allow high current polarimetry
  • 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
slide11

687 MeV Run

  • 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 checkout @ 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 6th and A 24th)
  • Mar 15 - Apr 29 : G0 (commissioning & production) at 650 MeV/pass

Efforts shift to “hot checkout”, commissioning plans & safe operations.