SLAC MEMORANDUM **DRAFT**
TO: E-166, Pep2 Ops, EOICs REV: Aug 24, 2005
FROM: Rick Iverson
SUBJECT: FFTB Startup Checklist for E166 “Polarized Positrons”
Schedule: E-166 to run from Sep 6 to Oct 3, 2005
Purpose: Demonstrate undulator-based polarized positrons for linear colliders.
_____1) Establish Electrons to CA11 PR-55 at 50GeV
Beam Energy: 50GeV, 1e+10 electrons/bunch, 1-10pps
LI28 Emittance: "6 by 0.6" That is x < 6.0e-5mr, y < 0.6e-5mr.
Energy Spread: < 0.2%. That is, minimum energy spread.
_____2) These are the configs to start with. After the first shift,
configs will be saved that are more current.
FFTB Magnet NOR#748 “-nice spot-clean backgrounds”
FFTB Mover NOR#287 “-e166 day”
FFTB BPM NOR#814 “-nice spot-clean backgrounds(E166)
COLLLI30 NOR#269 “-e166 day”
_____3) Check that the FFTB BCS and MPS are made up on the FFTB digital status
panel. All B406 devices should be active except the following:
MSLT FS#1,2 (There are no flow switches on the MSLT).
Plasma Oven (Removed when E164 is not running.)
Valve 6064,6070 and mirror 6071
(Removed when E164 is not running.)
_____4) Verify that the BAS is signed off and the beam containment devices
in the BAS are active.
_____5) When the experimenters are ready for beam,
-Go to no access, put in ST-62, reset and trim Q5,Q6,
pull the vacuum valves etc.
-Bring the beam to ST-62.
*Note: It is not necessary to degauss 50-B1. Just do "LGPS OFF" and set the
launch with CA11,xcor 36 and ycor 37.
-Verify that CB00 Launch and FFTB FB31 Energy feedbacks
are working with the beam still on ST-62.
-Dump the beam on 2-9 and remove Prof 1090 and ST-62. Go to 1Hz
and bring the beam to the main FFTB dump.
-Correct steering and energy until the bpms match the reference orbit
-FFTB PLIC level should be <2mv with beam current of 1e+10. The
Sector 30 PLIC level should be 50 to 100mV. The beam
emittance may need tuning if the PLIC is too high.
-Adjust sec-30 collimator settings as needed to reduce backgrounds.
-Call the E-166 experimenters in building 407a (x5460) and let them know
that the beam is ready.