sc-pac2001-6.19.01 operated by the southeastern universities research association for the u.s....
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/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Managing CEBAF Accelerator OperationsManaging CEBAF Accelerator Operations
Andrew Hutton
Institutional Management Review
August 30/31, 2004
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
OutlineOutline
CEBAF Accelerator Characteristics
Response to Hurricane Isabel
Accelerator Achievements in FY04
G0 Experiment completed
Hypernuclear Experiment completed
HAPPEx-He and HAPPEx-II initial runs completed
Operations Metrics
Preparing for Upcoming Challenges
Path forward – new Operations Vision
Summary
/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Brief Description of CEBAFBrief Description of CEBAF
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
CContinuous ontinuous EElectron lectron BBeam eam AAccelerator ccelerator FFacilityacility
AB
C
A B C
A
B
C
Gain switched lasers @499 MHz, = 120
Pockels cell
Gun
0.6 GeV linac(20 cryomodules)
1497 MHz67 MeV injector
(2 1/4 cryomodules)1497 MHz
RF separators499 MHz
Double sidedseptum
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
CEBAF CapabilitiesCEBAF Capabilities CEBAF delivers independent beams to all three Halls
Energy – must be multiple of linac energy 1, 2, 3, 4, or 5-pass to any Hall All Halls can simultaneously have 5-pass beam
Current – fully independent Halls A & C take up to 140 μA Hall B takes up to 50 nA (and down to 100 pA!)
Polarization – orientation of longitudinal polarization depends on Hall energy due to precession At least 50% of experiments want longitudinal polarization
An increasing number of experiments want “parity quality” beams Small helicity-correlated change in current, position, angle, polarization
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Dynamic Operational RequirementsDynamic Operational Requirements Unlike a storage ring, the operating conditions of CEBAF are changed
frequently based on User needs
In FY02, FY03, FY04 there were:
6 9 3 linac energy changes
21 15 5 pass changes in Hall A
8 6 5 pass changes in Hall B
4 10 4 pass changes in Hall C
25 30 14 accelerator state changes
On average, the accelerator state changes about once per operating week This does not include special set-ups for Moeller runs, energy
measurements, etc.
/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Response to Hurricane IsabelResponse to Hurricane Isabel
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Hurricane IsabelHurricane Isabel Isabel arrived ashore as a Category 1 hurricane on September 18, 2003
Removed electrical power from site for four days – specifically from CHL so cryomodules warmed up
Recovery took six weeks Aggressive preventive maintenance carried out on almost every
component - improved reliability during the year Engineering, SRF Institute, Operations
Accurate beam set-up provided a solid, reproducible base for operations CASA, Operations
Launched us into extremely successful year operating period
Details on Poster
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Improving Hurricane PreparednessImproving Hurricane Preparedness Evaluated back-up power options
Full back-up power is expensive, requires active management Renting seems better (RFP is out)
Major investment in switchgear and long term contractual obligation
Decided to implement emergency power loop Provides power to critical systems
Pumps to maintain insulation on cryomodules, valve actuators Special funds from DOE awarded June 2004
Expect completion before next hurricane season (May 2005) Interim, temporary solution developed (extension cords, UPS, small
generators, etc.) Ready to implement if needed
Initiated aggressive tree-cutting near to offsite power line
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Tree Clearing near Power LineTree Clearing near Power Line
Insert Photo Here
/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Accelerator Achievements in FY03/4Accelerator Achievements in FY03/4
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Experiment Successes FY03/FY04Experiment Successes FY03/FY04 G0 required 40 μA at 31.2 MHz – every 16th bucket filled
Bunch charge 6.5 times more than original specification “Parity quality” beam imposed optics constraints
Hall A hypernuclear experiment required: Energy spread < 3x10-5 Scheduled in parallel with G0
HAPPEx-II and HAPPEx-He required: Tightest “helicity correlated asymmetries” ever
Position asymmetries < 2 nm Energy asymmetry < 0.6 ppm
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
G0 Parity Quality BeamG0 Parity Quality Beam
Beam Parameter
Achieved
(IN-OUT)/2
“Specs”
Charge asymmetry
-0.14 ± 0.32 ppm
1 ppm
x position differences
3 ± 4 nm 20 nm
y position differences
4 ± 4 nm 20 nm
x angle differences
1 ± 1 nrad 2 nrad
y angle differences
1.5 ± 1 nrad 2 nrad
Energy differences
29 ± 4 eV 75 eV
Total of 744 hours (103 Coulombs) of parity quality beam
All parity quality specs have been achieved!!
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Hypernuclear Experiment Energy SpreadHypernuclear Experiment Energy SpreadE
nerg
y S
prea
d x
10-5 Spec
3x10-5
Data from April 21-29
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
New superlattice photocathode
Polarization >85%
Figure of Merit improves by ~30%
(over strained-layer cathode)
Electron onlyPhoton only Preliminary
HAPPEX-IIHAPPEX-II Photon Detector Signal/Background > 10
Demonstrated feasibility of maintaining Compton polarimeter background count rate: <100 Hz / A at 5mm (10-10)
“slug” number
x (
nano
met
ers)
CASA and EGG have worked closely with HAPPEX to meet stringent requirements on helicity-correlated position differences.
After correcting early problems at source, the ability to meet helicity-correlated specifications was demonstrated.
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
DOE Metrics for FY03DOE Metrics for FY03
Metrics for FY03 were excellent
Availability for multi-Hall Physics operation not as good as our Users would like, but performance better than DOE goal
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
DOE Metrics for October – July FY04DOE Metrics for October – July FY04
Post-hurricane maintenance
extremely effective
Hall A septum
/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Preparing for Upcoming ChallengesPreparing for Upcoming Challenges
EnergyParity
Polarization
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Energy Outlook for FY04/05Energy Outlook for FY04/05 Scheduled to deliver 5.75 GeV, 100 kW beams in September 04
Hurricane reduced accelerating voltage by ~40 MV/turn, 200MeV from top beam energy
Predicted RF trip rate will be “high” ~15/hour Will make operation of accelerator difficult
Required to reach goals of experimental program Compromise accepted by Users
Expect RF trip rate to improve when new 12 GeV prototype cryomodule replaces NL11 (operational by July 05) RF trip rate at 5.75 GeV will be acceptable ~10/hour
Refurbishment of existing cryomodules would provide 6 GeV operation by July 06 with acceptable trip rate (~10/hr)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Parity Violation Experiments at CEBAFParity Violation Experiments at CEBAF
Helicity-correlated asymmetry specifications
Achieved for G0 4 ± 4 nm -0.14 ± 0.32 ppm
ExperimentPhysics
Asymmetry
Max run-average helicity correlated
Position Asymmetry
Max run-average helicity correlated
Current Asymmetry
HAPPEX-I 13 ppm 10 nm 1.0 ppm
G0 2 to 50 ppm 20 nm 1.0 ppm
HAPPEX-He 8 ppm 3 nm 0.6 ppm
HAPPEX-II 1.3 ppm 2 nm 0.6 ppm
Lead 0.5 ppm 1 nm 0.1 ppm
Qweak 0.3 ppm 20 nm 0.1 ppm
1999
2007
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Superlattice CathodeSuperlattice Cathode Polarization 87% (recent User measurement)
Typical polarization from traditional strained layer material ~75%
Quantum Efficiency ~ 1% Typical QE of traditional strained layer material 0.2%
Analyzing power 4% Factor 3 better than strained-layer material in the lab
Smaller intensity and position asymmetries on beam Improvement not yet seen in experimental data
Installed on Accelerator 5/17/04 Successfully operated for experimental program (HAPPEx) Lifetime was not good – attributed to bad vacuum
NEG pumps replaced in present accelerator shutdown
Will be standard for all experiments
Matt Poelker and Maud Baylac (Injector)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
New Laser Clean Room for Injector New Laser Clean Room for Injector
Insert Photo
/SC-PAC2001-6.19.01
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Andrew Hutton IM Review 2004 Thomas Jefferson National Accelerator Facility
Path Forward Path Forward New Operations VisionNew Operations Vision
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Drivers for ChangeDrivers for Change Our accelerator operations are second to none
Biennial Workshop on Accelerator Operations initiated by JLab
Our Control System is one of the world’s best managed Karen White is regularly invited to lecture on managing software
But, we believe in continuous improvement (really)
Four main drivers for change: Main Control Room (MCC) needed renovating
Aging flooring, improve air conditioning, bad ergonomics, needed better integration of ODH alarms, fire alarms and access controls
ORACLE database available, needed EPICS integration Full accelerator model will be available soon and we should plan for it Must prepare to commission and operate 12 GeV
Goal – use these drivers to revamp operations processes
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
MCC UpgradeMCC Upgrade Layout modified to provide:
Crew Chief oversight of operators Station for Program Deputy accessible to support staff
Responsible for program oversight for two-week period Stations for Principle Investigators
Direct special machine set-ups and beam studies Improved teaching environment for operators Discussion area with “mirrored” computer screen
Existing tall racks replaced with desk height work stations Multiple small monitors replaced with few large screens
Better visibility of access controls (personnel safety system)
Integrated beam diagnostics displays
Managed by Mike Spata and Tom Oren (Operations)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Old MCCOld MCC
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
New MCC (three weeks later)New MCC (three weeks later)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Operations Vision Operations Vision Primary focus – are beams meeting User requirements?
Secondary focus – is each region performing correctly?
Provides common structure for thinking about accelerator operations, database, accelerator model, HLA, new installations Hierarchy based on the accelerator layout
Usual focus on kinds of element (magnets, steering, RF) - WBS Change to “functional segmentation system” derived from beam-
based set-up Highest level derived from User requirements
Halls, energies, currents, polarizations, beam specifications
Increases focus on diagnostics to ensure that beam meets specifications
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Highest Hierarchical LevelHighest Hierarchical Level Defined standard set of beam specifications for Users
User may negotiate tighter specs when proposing experiment (TAC)
Experiment schedule defines which experiments are running User requirements are known – import requirements from database
Use these requirements to configure the accelerator Derive set-points for the machine set-up
Energy, current, polarization . . . . . Integrate beam specs with instrumentation to monitor compliance
Energy spread, spot size, helicity-correlated effects . . . . .
Highest level display shows if beam specifications are being met, and if not, which parameters are out of tolerance
Managed by Hari Areti (Experiment Coordinator)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Beam SpecificationsBeam Specifications
DC Beam Properties
There are also AC Beam Properties and Helicity-correlated Beam Properties
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
ExampleExample Experiment beam request
Experimental requirements
Parameter Measurement
Tool
Nominal
Value Stability
Helicity Correlated
Value
Current: ibc1h01 < .11 uA .21 uA .31 ppm
Position:
2x01
2C20
3C02
3C04
X: 1 um
Y: 22 um
X: 32 um
Y: 42 um
X: 52 um
Y: 62 um
X: 98 um
Y: 97 um
X: 92 um
Y: 102 um
X: 112 um
Y: 122 um
X: 132 um
Y: 142 um
X: 96 um
Y: 95 um
X: 172 ppb
Y: 182 ppb
X: 192 ppb
Y: 202 ppb
X: 212 ppb
Y: 222 ppb
X: 94 ppb
Y: 93 ppb
Energy: harps 1-4 253 Gev 263 MeV 273 ppm
Energy Spread: sli1c12 284 MeV 294 MeV
Bleedthrough: smrposa < 305 %
Polarization: No Data Entered ---
Spot Size: ipm1h04x ipm1h04y
326 mm 336 mm
346 mm 356 mm
366 ppm 376 ppm
Background: background tool 25 %
Angular
Divergence
at Target:
ipm 1h04z 398 mr 408 mr
418 mr 428 mr
438 ppm 448 ppm
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
DiagnosticsDiagnostics Each beam specification is mapped to at least one diagnostic
Diagnostics are of three main types Run-time monitors that function at all times
BPMs, Synchrotron light monitors, OTR, beam loss monitors, experiment detectors, Compton back-scattering
Invasive monitors that cannot take full power Screens, Harps
Infrequent monitors that require special set-up Moeller and Mott measurements, current and energy calibrations
Long term goal is to monitor all beam specifications to required accuracy non-invasively over complete range of operating conditions
Diagnostics must be integrated with software packages and tightly coupled to User-specific beam specifications
Managed by Arne Freyberger (CASA)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
DatabaseDatabase Master copy of all information will be held in a database
“Authoritative source”
All other instances will reference database to obtain current value Vital for maintaining control over machine changes
Information will be assigned to one of two databases, depending on the frequency of change We already have a dynamic, “run-time” database – EPICS Adding master database for static and slowly changing data - ORACLE
Databases will eventually manage all accelerator data Database will be the information source for everyone
Engineering support groups, operations, controls
Managed by Theo Larrieu (Controls)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Impact on Control SystemImpact on Control System Robustness requires nested checks at all levels of software
Example of making tools robust: BPM passes self-check Feedback system uses model to determine best corrector, BPM
configuration based on Optics System measures BPM response to corrector kicks Compare corrector-BPM response to model Downstream elements monitored to ensure feedback system is
performing desired function
Providing all necessary hooks requires global re-examination of Control System at every level Device drivers, low-level applications (Matt Bickley) High level applications, communication protocols (Brian Bevins)
Managed by Karen White (Controls)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Optics Model-Database RelationshipOptics Model-Database Relationship Model obtains input from
ORACLE Component layout derived from Survey group Component specifications from Engineering Support Groups Impacts all Support Groups Vehicle for configuration control
Global settings Configured from User Requirements Off-line optics calculation by CASA
Result goes into Oracle database
Set points calculated for dipoles, quadrupoles, RF
Model server output is available to all high level applications Eventually, all high level applications will be model driven
Managed by Yves Roblin (Controls)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Optics Model ImprovementsOptics Model Improvements Model requires accurate knowledge of magnets over wide energy range
We have ~2000 magnets, not all properly characterized Uncertainty due to dipole gradients from remanant fields Additional uncertainty from orbit-related focusing errors due to badly
characterized “gold orbit” Diagnostics added in spreaders and recombiners
Beam-based measurements being used to measure errors Requires special optics (weak focusing)
Data taken over last year, dedicated period at end of last run Evaluated during the summer accelerator down Will be used for setting up the machine in September
Managed by Mike Tiefenback (CASA) and Tommy Hiatt (Engineering)
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
Implementation StatusImplementation Status MCC refurbishment complete (MCC visit during Tour)
Planning, implementation and result are fantastic success
Requirements Document for Control System being written “Executive Summary” complete
Ensures coherency of Vision across Division Some aspects already implemented
Model under active development
Guiding principles of the Vision will be integrated into new and upgraded software for years to come Expect positive impact on operations within six months Changes the way we do business for years to come Prepares operations for commissioning and operating 12 GeV
Andrew Hutton IM Review 2004
Operated by the Southeastern Universities Research Association for the U.S. Depart. Of Energy
Thomas Jefferson National Accelerator Facility
SummarySummary FY03 operations were excellent, FY04 were outstanding
G0, an incredibly difficult experiment, got more data than requested, beam exceeded all specifications
Hypernuclear experiment received beam with outstanding energy spread – run average ~2.2 X 10-5 Even more impressive as experiments ran in parallel
HAPPEx tight parity quality specs achieved
Availability for Physics much improved since hurricane due to additional maintenance that was performed
New Vision will improve Operations in coming months Motivates and energizes multiple Groups Prepares for commissioning and operating 12 GeV Upgrade