Injector Accelerator Readiness Review, 10/31/06 D. Schultz 1 Readiness of Commissioning Procedures...

1Injector Accelerator Readiness Review, 10/31/06D. Schultz

Readiness of Commissioning Procedures

Personnel & Hardware

David SchultzLCLS e--beams Systems Manager

Injector Accelerator Readiness Review10/31/06


Outline

1. Design requirements and revision control 2. Engineering design and safety approval proces

s3. Beam Power, Losses, and MCB4. Personnel Protection, Beam Containment, and

Laser Safety Systems5. The Safety Assessment Document6. Commissioning Readiness7. Accelerator Operations personnel and procedu

res8. Maintenance personnel and procedures


1. Design requirements and revision control

The LCLS process:

1) Physics Requirements Documents are written by the physics group. These give the specs the engineers need to meet.

2) Engineering Specification Documents are written by the engineering team detailing how the specs are to be met.Steps 1) and 2) may be iterated, depending on how impossible a task the physicists have asked for.

In some cases (eg. diagnostics) the PRD and the ESD are merged.PRDs and ESDs are revision control documents.

Interface Control Documents define requirements between systems (eg. Injector and Conventional Facilities, ICD 1.1-502)


http://www-ssrl.slac.stanford.edu/lcls/internals/documents/prd/


2. Engineering design and safety approval process

LCLS is conforming to the normal SLAC process:1. The design of the Injector and Linac systems was

presented to the SLAC Safety Overview Committee. The SOC determines which of the SLAC Safety Committees (Citizen’s Committees) need to review a project. Because of the scope of the LCLS Injector and Linac, all Citizen’s Committees were involved.

See Eric Bong’s talk in the breakout


SOC Signoff

By Committee chairs or Safety OfficersMay include stipulation to hold additional review or inspection of installed equipment prior to operation


SLAC Citizen’s Safety Committees

As Low as Reasonably Achievable (ALARA) CommitteeEarthquake Safety Committee

Electrical Safety Committee

Environmental Safety Committee

Fire Protection Safety Committee

Hazardous Experimental Equipment Safety CommitteeHoisting and Rigging Safety Committee

Laser Safety Committee

Nonionizing Radiation Safety Committee

Radiation Safety Committee


2. The design of the technical systems proceeds, following the PRDs and ESDs, and CDRs, PDRs and FDRs are held within the LCLS project. Systems which have a significant safety component have on their Design Review Committees a member of the appropriate Citizen’s Committee.

Technically knowledgeable reviewers.Brings safety concerns to the design early in the process.Brings experience with the design to the Citizen’s Committee.Example: Vacuum electronics system.


Engineering design and safety approval process

3. When the design of the technical systems is complete, it is presented to the appropriate Citizen’s Committee, or approved by the appropriate SLAC Safety Officer.Some magnet stands were approved by the Earthquake Safety Officer without going to the full committee, other structures required full approval.Approval of the system by the committee is recorded in the minutes committee’s meeting.


Engineering design and safety approval process

4. After installation the SLAC Safety Officer(s) may require inspections.This is the final step for Laser Safety.For Radiation Safety, certification of the Personnel Protection System and Beam Containment System, and inspection of shielding are required before beam operations can begin, and are specified in the Beam Authorization Sheet (BAS).Preliminary beam measurements and calibration of BCS components are also specified in the BAS, and are conducted shortly following the establishment of beam.


3. Beam Power, Losses, and MCB

Shielding needs are analyzed forNormal operationsMis-steering conditionsMaximum Credible Incident

Beam losses are calculated by the responsible accelerator physicist and given to Radiation Physics for shielding analysis.

Shielding is specified, and designed.Results are approved by the RSC

See Stan Mao’s talk in the breakout

PRD 1.1-011-r3, Electron Beam Loss in the LCLS, D. Dowell / P. Emma / J. Welch


The Accelerator Safety Envelope

Nominal operating conditions:

At TD11: 120 nA at 250 MeV 30 W

At the end of SLAC Linac: 120 nA at 14.1 GeV 1.7 kW

Maximum beam power for operations: 5 kW

Maximum credible LCLS beam power:

At TD11: 6 μA at 250 MeV (max) 1.5 kW

At the end of SLAC Linac: 6 μA at 16 GeV (average) 100 kW

EnvelopeBeam Power

LCLS Safety Envelope 100 kW

LCLS Operation Envelope 5 kW

LCLS Nominal Operating Power 1.7 kW


Nominal Beam Power Along Injector

Gun: 6 MeV, 0.7 W

TD11: 250 MeV, 30 W

135 MeV, 16 W

SDMP: 135 MeV, 16 W

250 MeV, 30 W


Dark current energy sources and powerestimates for the LCLS injector at 120 Hz

3-nC initial gun dark current based on worst-case GTF operations

where dark current is generated

where dark current is observed

dark current energy (MeV)

dark current charge/ pulse

(nC)

current at 120 Hz (A)

average beam power (W)

in gun after gun 6.2 3 0.36 2.2 in L0-a after L0-a 56 0.16 0.019 1.1 in L0-b after L0-b 130 0.32 0.019 2.5


Estimated average beam power loss and location along the LCLS in nominal and special tune-up conditions. Power levels set in bold type occur in normal operating conditions. Non-bold entries are special configurations as described in the “note” column.

Table Notes:aa. This loss occurs only when this Faraday cup is inserted (6 MeV, 120 Hz).a. This loss occurs only with beam on the gun spectrometer (6 MeV, 120 Hz).b. This loss occurs only with beam on the injector spectrometer (135 MeV, 120 Hz).c. This is a normal loss due primarily to dark current from gun and injector.d. This loss occurs only with beam on this tune-up dump (120 Hz).

Nominal and Tune-up Beam Losses from Gun through BC1 ending at TD11

Component Description Area Linac z [m]

LCLS z [m]†

Energy [GeV]

Power [W]

note

FC01 Gun Faraday cup gun 2018.42 - 0.006 3 aa FCG1 Spec. Faraday cup gun 2018.47 - 0.006 1.15 aa GSDMP gun-spec. dump gun 2018.44 - 0.006 1.15 a SDMP inj.-spec. dump SAB 2036.08 - 0.135 16 b BX01 DL1 bend chamber DL1 2032.07 - 0.135 2 c L1X X-band struc. iris BC1 2044.76 - 0.260 0.5 c CE11 energy collimator BC1 2049.34 - 0.250 < 0.1 c TD11 tune-up dump BC1 2058.57 - 0.250 30 d


Maximum Credible Beam

The source in a RF Photocathode Gun is Explosive Electron EmissionExplosive electron emission occurs from the photocathode if the drive laser intensity exceeds the threshold for plasma production. This emission persists until it has depleted the gun of all its stored energy. Beam transmission and losses were calculated based on energy spread and beamline component apertures.


Summary of Maximum Credible Beam Poweralong the Injector and into the Linac

LCLS PRD 1.1-001 at: http://www-ssrl.slac.stanford.edu/lcls/prd/1.1-001.pdf.

Location Average Energy (GeV)

Charge per pulse

(C)

Current at 120 Hz

(A)

Beam Power (kW)

Gun exit 0.004 2.5 300 1.2

Beam loss in gun region 0.004 2.1 260 1.0

Beam on FCG1 Faraday cup in gun spectrometer 0.004 0.38 45 0.18

L0-a exit 0.048 0.38 45 2.2

Max. beam loss in L0-b 0.048 0.38 45 2.2

L0-b exit 0.110 0.38 45 5.0

Beam loss at straight ahead spectrometer 0.110 0.38 45 5.0

Beam transported to main linac (nom. DL1 setting) 0.110 0.050 6.0 0.6

X-iris 0.250 0.050 6.0 1.5

Bunch Compressor BC1 0.250 0.050 6.0 1.5

Dump TD11 0.250 0.050 6.0 1.5


Maximum Credible LCLS Beam at the end of the Linac

To transport this beam to the BSY:Assume no Linac losses due to mis-focusing of quadsAll 17 GeV of klystrons are on, beams run at pulse crestBeamloading by 0.16 A of ‘macro-pulse’ beam current (6 µA average current), resulting in an average 16 GeV of energy gain100 kW Maximum Credible LCLS Beam

LCLS 100 kW MCB is less than Linac 2 MW MCB, and even less than the ~600kW actually delivered to E158


4. Personnel Protection, Beam Containment, and Laser Safety Systems

The Personnel Protection System limits access to beamline areas when hazards are present, and interlocks those hazards (beam, RF, hazardous magnet power) when access is allowed.The Beam Containment System contains interlocks which trip when the beam is out of specified bounds.

Toroids limit beam current, collimators limit beam trajectory, ion chambers limit losses, burn-through monitors assure the integrity of stoppers and dumps Ensures that the conditions under which shielding calculations were made, are held.


Personnel Protection and Beam Containment Systems

The Programmable Logic Controller based Personnel Protection System is new to SLAC. Hardware installation is underway. The review process with the SLAC Radiation Safety Committee:

PLC system design was conditionally approved (for the Injector).

The Committee wants to see the certification procedure.

Beam loss and shielding designs were approved. Beam Containment System was approved 10/19.

See Mike Saleski’s talk in the breakout


PPS & BCS Coming Up

PPS certification

Linac – Nov. 3, 2006

Injector – Dec. 18, 2006

BCS system device calibration

A part of beam checkout, specified in the Beam Authorization Sheet (BAS)

Occurs as the beam reaches that area of the beamline.

See William White’s talk in the breakout


Laser Safety Milestones

SOP PDR Dec 16, 2005

SOC Review Feb 22, 2006

Thales ESC May 15, 2006

SOP FDR March 6 2006

LSC Temp SOP May 9, 2006

SOC Approved July 14

LCLS Work Auth. July 19, 2006

LSC Final SOP October 10, 2006


Laser Safety Coming Up

LSS Hardware installation complete and certified Oct 27, 2006

LSO Walkthrough Oct. 30, 2006

Operation under Final SOP Oct 30, 2006

Vault Laser Wall complete Nov 17

Vault LSS Complete and Certified Nov 24, 2006

See William White’s talk in the breakout


5. The Safety Assessment Document

The SAD covers the commissioning of the LCLS Injector Linac in the upcoming year.It has been reviewed, comments incorporated, and is in the Director’s office for signature.SLAC Linac programs (PEP2, ESA) are covered under the Linear Accelerator Facility Safety Assessment Document.These SADs will merge next year, and will include the operation of the entire LCLS.


6. Commissioning Readiness

Turn-on ProceduresCommissioning ParametersSchedulePersonnelCommissioning Readiness Review

See Paul Emma’s talk in the breakout


LCLS Injector Turn-On Procedures

The installation of Injector systems is proceeding rapidly, including installation of equipment racks, AC power to those racks, equipment in the racks and cable plant from the racks to beam-line components.These systems need to be energized for checkout in a controlled manner to ensure that turn-on upstream does not expose a hazard downstream.The systems will be locked off administratively, and those locks will be removed in sequence after reviewed procedures are followed to the satisfaction of the administrator.The procedures are under development.


Parameter Value Comments

RF rate 30 Hz 30 Hz in linac - 120 Hz in gun hot test gun

Beam rate ≤30 Hz 10 Hz ebeam as baseline – possible short term 30-Hz tests (difficult beyond 30 Hz due to laser rate)

Drive-laser rate 30 Hz 120-Hz during laser commissioning – 30 Hz during e commissioning - shutters provide lower e rate

Bunch charge 200-500 pC depends on QE and diagnostics – some short spans at 10 pC – later in ’07 explore 1-nC

LCLS Injector Commissioning ParametersOperation plan, rep. rate and charge reduced.


pass-1pass-1

pass-1pass-1

pass-2pass-2

pass-2pass-2

pass-3pass-3

pass-3pass-3

(detailed schedule available)(detailed schedule available)

Tasks include rad. phys. measurements


Personnel Available for LCLS Injector/BC1 CommissioningShift Leaders

(initially)(1 per D/S shift)

1. Dave Dowell2. Paul Emma3. Jim Turner4. Bill White (laser)5. Joe Frisch6. Cecile Limborg

Operations(1 per DAY & SWING shift and 2 per OWL)

LCLS Physicists(1 per D/S shift)

1. Sasha Gilevich2. Henrik Loos3. Heinz-Dieter

Nuhn4. John Schmerge5. Dave Schultz6. Jim Welch7. Juhao Wu

Controls eng.(1 per DAY shift)

1. Stephanie Allison2. Mike Zelazney3. Debbie Rogind4. Diane Fairley5. Stephen Norem6. Arturo Alarcon7. Doug Murray8. Sergei Chevtsov9. Dayle Kotturi10. Patrick Krejcik11. Kristi Luchini12. Sheng Peng13. Stephen Schuh14. Till Straumann

Sys. Engineers(1 per DAY shift)

1. Eric Bong2. Carl Rago3. Leif Eriksson4. Richard F. Boyce5. Jose Chan6. Tim Montagne7. Paul Bellomo8. Antonio de Lira9. Dave MacNair10. Ron Akre

Accelerator, ILC, SSRL

1. Franz-Josef Decker2. Rick Iverson3. Doug McCormick4. Jeff Corbett5. James Safranek...

Laser Operators (4-5 in all) Shift-takers will be familiar with

Accelerator Division Operations Directives.


Commissioning Readiness Review


Commissioning Readiness Review

Findings:The Committee has high confidence in the capabilities of the LCLS injector commissioning team and their plans.The design of components and systems, physics studies of expected performance of diagnostics under a variety of conditions, preparedness of controls systems functionality, assembly of team members and distribution of their expertise, and planning for commissioning activities are well thought through.The main area of concern for the Committee is that the schedule for installation of components … may impact the ability to complete commissioning plans in the timeframe presented.


7. Accelerator Operations personnel and procedures

LCLS Commissioning will be done with SLAC Accelerator Dept. Operators following existing SLAC Accelerator Operations procedures.

The Operators are trained and experienced, and the LCLS Injector will not require special training.

Will need training for searching the LCLS InjectorThe procedures are being modified, as appropriate, to account for changes and additions from the LCLS Injector.

Eg. The PPS zone search procedure needs to include the procedure for searching the LCLS Injector.

See Mike Stanek’s talk in the breakout


8. Maintenance personnel and proceduresMaintenance of the LCLS Injector will follow established SLAC Linac practice.

Training, maintenance and documentation is well practiced.LCLS Engineers will be on call to address specific cases.

Installation is being done with the maintenance departments involved.

eg. Magnet power (racks, controls, supplies, interlocks, cables, database) is being specified and installed in close association with SLAC Power Conversion Dept.

Maintenance equipment (eg. vacuum roughing pumps) are being specified with the maintenance departments.

See Paul Bellomo’s talk in the breakout


ARR(Schultz)

Create Commissioning

Schedule(Emma)

Review Commissioning

Plan(Emma)

Commissioning Readiness

Review(Emma)

Amend OperationsProcedures

(AD & Saleski)

Write/AmendMaintenance Procedures

(tbd)

Systems’ FDRs(CAMs)

Systems IRR(CAMs)

Systems Safety Documentation

(CAMs)

PPS/BCS FDR(Saleski)

RSC Review(s)(Saleski)

SOC Approval(Schultz)

ESC Review(s)(CAMs)

Safety officers’ approvals(CAMs)

Electrical Subsystem FDR

(CAMs)

Electrical Subsystem FDR

(CAMs)

SAD Approval(Schultz)

SAD Preparation(Schultz)

SAD Review(Schultz)

Subsystem FDRs

(CAMs)

Laser SOC FDR(White)

LSS Approval with LSC(White)

Laser Inst. Readiness

Review(White)

May 26, 2006

ARR planning:May 2006

In progress

In progress


SummaryLCLS has integrated safety in the design of the Project

Equipment has been designed with appropriate safety controls are in place. Well integrated with SLAC safety management organizations.

Beam conditions, losses, and shielding are well understood and reviewed. Documentation and procedures to permit safe operation are understood and in preparation.

Good planning and preparation for commissioning.Personnel are trained for safe operation and maintenance.


end

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