CesrTA Machine Studies Task Overview
I. Experiment Description
Experimental Topic
Classification*
Coordinator/
Experimenters
Primary Goals
Optics Recovery
LET
JSh
JSh
Description†
This is a standing request that applies to all optics requested by users for the April
CesrTA run. The tasks covered by this request are:
 Correct orbit (for *INJ on-axis and *XRAY xBSM orbit sets)
 Correct phase/coupling
 LET correction (orbit + coupling + dispersion)
 Ramp and recover conditions
 Repeat for both positrons and electrons
Recover low-emittance conditions in all required lattices.
The time estimates assume injection has already been recovered for the lattice in
question.
For the following lattices, two hours of dedicated LET tuning time is requested
for each species. (if both e+ and e- will be required during the run, the request is
for four hours total):
 BIGD
 CD40
 V15M
 2.3GeV V15M
 4GeV
BIGD, CD40, and V15M (e+ and e-) could (should?) be recovered in one shift of
8 hours. Ideally this would be an evening shift (16:00-24:00), left open-ended.
For the subset of the following lattices which are requested by users, four hours
are requested for dedicated emittance tuning and optics correction for EACH
SPECIES (that is, if only positrons are requested, we only need four hours—
otherwise, we need two four-hour shifts to recover both species):
 XR2M
 1.8GeV
*
Machine Studies Classifications:
 EC – Electron Cloud
 LET – Optics Correction and Low Emittance Tuning
 IBS – Intra-beam scattering studies
 xBSM – x-ray Beam Size Monitor
 INST – Instrumentation (BPM development, RFA development, other)
 MDEV – Machine Development (includes injection configuration, injection tuning, custom orbit setup, instrumentation
preparation, etc.)
 MREC – Machine Startup (recovering conditions after down period or access)
†
Attach additional pages for experimental description if needed
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

2.5GeV
RFETA0 (Suntao’s 2.1GeV lattice)
These time estimates are based on previous experience in working with these
lattices.
Special
Needs/Requests
Prerequisites‡
Gain mapping
BPM/quad centering
xBSM functional
Time Requested§
8hr
2hr
4hr
‡
§
Each of the above recovery shifts must occur prior to the first shift where the
specified lattice is required by other users.
Personnel
Description
DLR/MGS
BPM button gains calibrated
DCS
BPM-to-quad centering calibrated
NTR et al.
xBSM for requisite species has been recovered (required for
final orbitry; on-axis corrections and coarse corrections can be
applied before xBSM is fully functional)
No. Shifts
Principal Tasks
1
Recover LET condx for BIGD, CD40, and V15M, e+ and e-.
Optimally this would be an open-ended evening shift (16:0024:00).
Up to 4
Recover LET condx for 2.3GeV/4GeV lattices (for subset
which are requested by users), for e+/e- (if requested by users)
Up to 8
Recover LET condx for XR2M, 1.8GeV, 2.5GeV, and
RFETA0 lattices (for subset which are requested by users), for
e+ and e- (for subset which are requested by users)
Indicate other machine work that is required in preparation for this machine studies experiment.
Indicate the principal shift topics and estimated number of shifts required
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II. Machine Studies Assignments
Reserved for Project Management Team Use
Topic ID
Priority**
Shift Assignments
Date
**
Shift
Priority Scale:
1. Critical – results are necessary for preparation for subsequent down/run periods
2. Very high – results are strongly desired for achieving program milestones or in preparation for subsequent
down/run periods
3. High – results are of immediate interest but not require
4. Moderate – results should be pursued at the first convenient opportunity
5. Low – results are not presently a high priority for either project milestones or planning
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