Haixin Huang
Overview
o June 27: Setup Helion in
Booster->AGS (without partial snakes). Possible CNI polarimeter test overnight.
o June 28: Setup AGS with cold snake on and low vertical tune. Possible CNI polarimeter test overnight.
o June 29: Setup AGS with cold snake on and high vertical tune.
o June 30: Buffer zone for any unfinished business.
The goal is to detect recoil carbons by CNI polarimeter and to test the AGS injection with cold snake on.
Job List
·
Set up CNI polarimeter at flattop as soon as beam is available (Kin, Haixin)
·
Measure emittance with AGS IPM on the ramp.
·
Measure tunes on the ramp.
·
Measure chromaticities on the ramp.
·
Beta function measurement at E15 IPM (Haixin, Leif)
·
Measure emittance at flattop with both horizontal and vertical targets.
·
Model comparison data taking if we have chance. (Francois, Yann, Nick)
·
First a few turns A15 profiles (Haixin, Leif)
·
Measure bunch length at injection and flattop (Keith)
·
Measure betatron tune at Booster injection. (Kip)
·
Set up low vertical tune in the Booster on a separated user, if time allowed. (Keith)
·
Take ORM data with snake off and on. Verify magnet survey impact on beta beat (Vincent)
Beam Plans
·
Machine parameters:
o ν_x=8.70, ν_y~8.9 at injection(archive
from last run with snake on).
o Warm snake
current=2670A.(20.2% at injection, 14% at extraction).
o Cold snake helix
current=187A and solenoid current=93.4A. This corresponds to 6% snake for proton, and is 14% snake for Heion (all at flattop).
o AGS rep rate=4
sec.
o The injection and
extraction energies: Gγ = 7.5 and Gγ = 49.5, respectively.
Setup
with Both Snakes Off
·
Scale BtA from Au cycle. Establish beam in the Booster and then the AGS with both
snakes off.
·
Setup RF to establish beam at flattop. No merge is planned for the AGS.
·
REV-TICK and Tunemeter setup.
·
CNI polarimeter setup. The setup
can start as soon as beam survives at extraction energy.
Prior to this work, the orbits (both horizontal and vertical) at top energy in
C15 section should be set as flat (both in time and angle) as possible.
Setup with Both Snakes On
·
Use AGS proton user4 as starting point (except the extraction has to be lowered in Brho). Use proton BtA as starting point. Establish beam in the AGS (injection at Gγ=7.5,
extraction at Gγ = 49.5 with snake on. Start
with on-demand mode and intensity of a few 10^10. Turn on cold snake (helical
187A, solenoid 93.4A,trim1 0A, trim2 7A) and E20 warm
snake (2670A). Turn on correction quads and bumps for both snakes. While tuning
the injection beam survival(first with rf off, then rf on), the beam
dump bump (J10) should be on at injection porch. After reaching a few times
10^10 beam survives, remove the dump bump and tune for beam survival along the
ramp. It may be efficient to load archives from last run and get beam
circulating first with that setting.
·
Commissioning instrumentation if not finished before: AGS
tune-meter; IPM.
·
Orbit corrector noise investigation with high vertical tune. If the noise showed up, turn off corrector one by one to find the offender. This is a tedious long process. We probably can not finish it. .
Setup with Low Vertical Tune in the Booster
·
After the AGS set up withhigh vertical tune is done, using a different Booster user to set up low vertical tune (4.11 near injection, below 4.43 at extraction).
AGS Operation System Experts
Booster
scraping: Keith
BtA lattice: Keith, Nick, Kevin
AGS/Booster
optics control application: Kip, Kevin
AGS
injection tuning: Keith, Vincent
AGS
RF:
Keith, KevinS
AGS
tune-meter: Dave Maffei
AGS
IPM:
Haixin, Kevin
AGS
orbit control and display: Shawn Perez
Data
spreadsheet: Seth
AGS
snake operation: Haixin, Keith
Snake
bumps and corrections: Nick, Keith
AGS
E880 polarimeter: Haixin
AGS
CNI polarimeter: Kin,Andrei, Haixin
AGS
extraction: Vincent, Greg, Nick
AGS
lattice matching: Vincent, Francois, Nick