Heinz-Dieter Nuhn, SLAC / LCLS Undulator Checkout and Startup Plans [email protected] November 12, 2008 1 Undulator Checkout and Startup Plans Heinz-Dieter

November 12, 2008 1 Heinz-Dieter Nuhn, SLAC / LCLSUndulator Checkout and Startup Plans [email protected]

Undulator Checkout and Startup PlansHeinz-Dieter Nuhn, SLAC / LCLS

November 12, 2008

Undulator Checkout and Startup PlansHeinz-Dieter Nuhn, SLAC / LCLS

November 12, 2008

Overview

Girder Installation Status

Pre-Beam Checkout Plan

Startup Plan

Beam Loss Monitor Status

Overview


Pre-Beam Checkout Plan

Startup Plan

Beam Loss Monitor Status


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Installation (=>Nov 08)All beamline components except Undulator Segments

Initial Checkouts (=>Nov 08)Quads/Corrs, BFWs, RFBPMs, Girder Motion, Control System, ADS

Correction of problems found during Initial checkouts (Nov 08)Broken BFW wires, Girder Motion Issues, Quad Terminal Corrosion, etc

Conventional Alignment (Nov 08)Set all cams to “Home Position” and disable girder motion controlAlign quadrupoles to “straight line” within 100 um (rms)Center BFWs between quadrupoles.

Final Pre-Beam Checkouts. Checklist exists (200+ pp). (Nov-Dec 08)Magnet Polarities / Motion (Girder, BFW, Slide) etc.

Pre-Undulator Commissioning with Beam (Jan 09 – Mar 09)Motion Control / Beam Containment / Beam-Based Alignment / etc.

Installation of Undulator Segments (Mar 09)Undulator Commissioning with Beam (Mar 09 – Apr 09)

Beam Based Alignment / Undulator Slide Functions / Beam Stability

Installation (=>Nov 08)All beamline components except Undulator Segments

Initial Checkouts (=>Nov 08)Quads/Corrs, BFWs, RFBPMs, Girder Motion, Control System, ADS

Correction of problems found during Initial checkouts (Nov 08)Broken BFW wires, Girder Motion Issues, Quad Terminal Corrosion, etc

Conventional Alignment (Nov 08)Set all cams to “Home Position” and disable girder motion controlAlign quadrupoles to “straight line” within 100 um (rms)Center BFWs between quadrupoles.

Final Pre-Beam Checkouts. Checklist exists (200+ pp). (Nov-Dec 08)Magnet Polarities / Motion (Girder, BFW, Slide) etc.

Pre-Undulator Commissioning with Beam (Jan 09 – Mar 09)Motion Control / Beam Containment / Beam-Based Alignment / etc.

Installation of Undulator Segments (Mar 09)Undulator Commissioning with Beam (Mar 09 – Apr 09)

Beam Based Alignment / Undulator Slide Functions / Beam Stability

Undulator Checkout and Startup


Girder Component Alignment and Girder Installation

Component Alignment on CMMComponent Alignment on CMM Girders installed in Undulator HallGirders installed in Undulator Hall



All girders are installed!

Alignment of all girder components (including “test” undulator segment) has been checked and corrected (if necessary) on CMM.

All quadrupoles have been individually characterized before installation

All BFW devices have been thoroughly tested for reproducibility before installation. Problems repeatability problems excist

Tuning and fiducialization of undulator segment is on-going.

Reminder: First Installation of undulator segments on girder planned for March 2009.


BFW Positioning

Beam travels out of slide plane


Correction of Problems found during Initial Checkouts

Replacement of 3 BFW cards that had broken wires[done]

Correction of quadrupole terminal plate corrosions

Correction of Interface Plate alignment to avoid cam block motion restriction

Improvement mounting of linear potentiometers for cam motion control [done]

Cam motion trouble shooting


Findings Requiring Correction

Uneven reference for linear potUneven reference for linear pot

Insufficient area for linear potInsufficient area for linear pot Quad terminal corrosionQuad terminal corrosion

Broken BFW wiresBroken BFW wires


204 p

ages

204 p

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Undulator Pre-Beam Checkout List: Overview

Checkout Items per GirderBFWBLMCAM ROTATIONSLINEAR POTENTIONMENTERSGIRDER MOTIONHORIZONTAL SLIDESQUADRUPOLE, XCOR, YCORRF-BPMTEMPERATURE SENSORSWPM AND HLS SENSORS

Checkout Items per GirderBFWBLMCAM ROTATIONSLINEAR POTENTIONMENTERSGIRDER MOTIONHORIZONTAL SLIDESQUADRUPOLE, XCOR, YCORRF-BPMTEMPERATURE SENSORSWPM AND HLS SENSORS


Undulator Pre-Beam Checkout List: Detail 2


Undulator Pre-Beam Checkout List: Detail 3


Undulator Beamline Commissioning to Main Dump with Beam but without Undulator Segments (Jan-Mar 08)

Get Beam through Undulator vacuum pipe with minimum losses.Commission Radiation MonitorsCheckout BPMs (timing, scale, sign errors, etc.)Commission Girder Motion with Beam

Verify and calibrate steering effect of quadrupole motionCalibrate motion parameters (gain, pivot points etc.)Check BPM offset tracking

Commission RF Cavity BPMsCheck charge dependent response over entire charge rangeUse Girder Motion to calibrate position vs. readings

Check and correct optics matching over entire operational energy rangeCommission Beam Based Alignment (BBA)

Develop saved configurations for three different energies.Commission BBA GUIs and BBA procedure.

Commission Beam Finder WiresCalibrate PMT signals.Commission BFW GUIs (Alignment and scanning capabilities)

Commission ADS-based girder position stabilization feedback systems.Commission Tune-Up Dump in preparation for commissioning with Undulator Segments

Get Beam through Undulator vacuum pipe with minimum losses.Commission Radiation MonitorsCheckout BPMs (timing, scale, sign errors, etc.)Commission Girder Motion with Beam

Verify and calibrate steering effect of quadrupole motionCalibrate motion parameters (gain, pivot points etc.)Check BPM offset tracking

Commission RF Cavity BPMsCheck charge dependent response over entire charge rangeUse Girder Motion to calibrate position vs. readings

Check and correct optics matching over entire operational energy rangeCommission Beam Based Alignment (BBA)

Develop saved configurations for three different energies.Commission BBA GUIs and BBA procedure.

Commission Beam Finder WiresCalibrate PMT signals.Commission BFW GUIs (Alignment and scanning capabilities)

Commission ADS-based girder position stabilization feedback systems.Commission Tune-Up Dump in preparation for commissioning with Undulator Segments


Install Undulator Segments (Mar 09)

Mount Undulator Segments onto girdersSegments will be stored in Undulator Hall before installation

System is designed to be Self-Aligning

Re-check slide motion clearance

Expect to install 3 Segments / day

Mount Undulator Segments onto girdersSegments will be stored in Undulator Hall before installation

System is designed to be Self-Aligning

Re-check slide motion clearance

Expect to install 3 Segments / day

Segment installation test scheduled for week of 11/18/2008Segment installation test scheduled for week of 11/18/2008


First Beam Through Undulator Segments (Mar 09)

Conditions for First Beam:All Undulator Magnets Rolled-Out

Single Shot Operation (low charge)Send single electron bunch through undulator

Read and evaluate as much diagnostics as possible along undulator(such as BPMs, beam loss monitors, toroids)

Identify and remove sources of beam loss – if any

Iterate

Goal: Get beam through vacuum chamber with minimum losses.

Reminder: Main Constraint is to Protect Undulator from Radiation Damage

Conditions for First Beam:All Undulator Magnets Rolled-Out

Single Shot Operation (low charge)Send single electron bunch through undulator

Read and evaluate as much diagnostics as possible along undulator(such as BPMs, beam loss monitors, toroids)

Identify and remove sources of beam loss – if any

Iterate

Goal: Get beam through vacuum chamber with minimum losses.

Reminder: Main Constraint is to Protect Undulator from Radiation Damage


First Undulator Segments Commissioning (Mar – Apr 09)

Undulator Segments still in Roll-Out positionRun BBA

Roll-In Individual Undulator SegmentsTransport beam through individual Undulator SegmentsStart at slot #33 (last Undulator Segment)

Check and correct trajectory change.

Run BBA with Undulator Segments inserted.

Check Segment alignment with BFWs

Undulator Segments still in Roll-Out positionRun BBA

Roll-In Individual Undulator SegmentsTransport beam through individual Undulator SegmentsStart at slot #33 (last Undulator Segment)

Check and correct trajectory change.

Run BBA with Undulator Segments inserted.

Check Segment alignment with BFWs

November 12, 2008 17 Heinz-Dieter Nuhn, SLAC / LCLSUndulator Checkout and Startup Plans [email protected] W. Berg, ANLCourtesy W. Berg, ANL

Undulator System Beam Loss Detectors

Different Means of Beam Loss Detection are Used in the LCLS Undulator Area

1. ANL Style Loss Monitors (Initially 5)2. PEP-II Style Loss Monitors (Initially 28, A. Fisher)3. Toroids for detection of charge loss

(2, before UND01 and after UND33)4. Fibers Mounted to undulator vacuum chamber

(Under Investigation by J. Frisch and A. Fisher)5. TLDs (up to 76), replaced on a weekly basis


Beam Loss Monitor (ANL Type)

Courtesy W. Berg, ANLCourtesy W. Berg, ANL

Radiator PMT

BLM inRoll-In Position

BEAM

Expected for later part of Nov 08Expected for later part of Nov 08


PEP-II Beam Loss Monitors

28 PEP-II BLMs initially used in addition to 5 ANL BLMs.

Thanks to A. Fisher and U. Wienands!

ANL BLMs at locations:1, 9, 17, 25, 33

All other girders will have PEP-II BLMs

28 installed!28 installed!


BLM Requirements

• Primary function of the BLM is to indicate to the MPS if losses exceed preset thresholds.

• MPS processor will rate limit the beam according to which threshold was exceeded and what the current beam rate is.

• The thresholds will be empirically determined by inserting a thin obstruction (OTR33) upstream of the undulator.

• Simulation of losses and damage in the undulator are under way in parallel with the manufacturing effort.


TLD Monitoring Program

The Radiation Levels generated inside the Undulator Hall need to be monitored using Thermoluminescent Dosimeters (TLDs) that are replaced as part of a standard operational monitoring program. The regular replacement program will start at the time when the Undulators are mounted onto the girders. (See step III, below). Steps I and II represent preparatory measurements.

I.Baseline (Pre-Beam) Sampling: October 2008 – December 2008

II.Pre-Undulator Sampling: January 2009 – March 2009

III.Continuous Sampling: March 2009 – …

The program will be managed byMike Zurawel: TLD installation and replacement

Radiation Physics: TLD readout and report generation


TLD Monitoring Program: Steps I and II

I. Baseline (Pre-Beam) Sampling: October 2008 – December 2008Mount 10 TLDs on girders. Leave TLDs in place for up to 3 months before removal and read-out.

II. Pre-Undulator Sampling: January 2009 – March 2009Stepper Motor Radiation Monitoring

Use 21 TLDs mounted on each of the 7 stepper motors of the 3 girders (UND01, UND15, UND33) to monitor the radiation exposure of these motors.

TDUND TestUse 6 TLDs mounted on girders. Leave in place while electron beam with and energy of 13.6 GeV will be parked at TDUND and none of the first 6 BFW devices will be activated.

BFW TestUse 33 TLDs mounted on girders, 1 each at the downstream end of each of girder. Run a 13.6-GeV-beam with 250 pC charge through the undulator vacuum chamber. Perform full series of BFW scans (20 hits horizontally, 20 hits vertically) for each of the 33 BFW devices (BFW01 … BFW33), one at a time.

Non-BFW Test.Same setup as above. Leave the TLDs in place for 1 week of beam operation in the Undulator Hall during which none of the BFW devices is to be activated.


TLD Monitoring Program: Step III

III. Continuous Sampling: March 2009 – …TLD Locations

Use 66 TLDs mounted to girders. Mount 1 TLD at the downstream mirror plate and 1 TLD at the upstream mirror plate of each undulator above the beam level, horizontally centered with the undulator magnet pieces.

Use 10 TLDs and 10 moderators mounted in the long break sections underneath the beam pipe.

TLD Replacement and Readout ProgramReplace all 76 TLDs once a week (preferably during the regular Wednesday ROD accesses. The TLDs need to be read-out and a report is to be generated within 10 days of their removal from the Undulator Hall. Thus, to be able to maintain a continuous replacement program, 3 sets of TLDs plus spares are required.


The undulator checkout and startup plans have been worked out and include

Detailed pre-beam checkoutPhase I: Electron-beam-based commissioning without undulator segments installed.Installation of undulator segments.Phase II: Electron-beam-based undulator segment commissioning

X-ray-beam-based commissioning is scheduled to start in June 2008 including

Commissioning of FEE diagnostics and spontaneous undulator radiationFEL/SASE commissioning.

Beam loss monitoring is integral part of undulator system

The undulator checkout and startup plans have been worked out and include

Detailed pre-beam checkoutPhase I: Electron-beam-based commissioning without undulator segments installed.Installation of undulator segments.Phase II: Electron-beam-based undulator segment commissioning

X-ray-beam-based commissioning is scheduled to start in June 2008 including

Commissioning of FEE diagnostics and spontaneous undulator radiationFEL/SASE commissioning.

Beam loss monitoring is integral part of undulator system

Conclusion


End of Presentation

Documents

Heinz-Dieter Nuhn, SLAC / LCLS Undulator Checkout and Startup Plans [email protected] November 12, 2008 1 Undulator Checkout and Startup Plans Heinz-Dieter