LCLS Undulator SystemsBeam Loss MonitorStatus Report, FAC 6.17.08 William Berg ANL/APS Diagnostics Group
Introduction • Purpose & Requirements • Project Scope Update • Global System Status & Schedule • Detector • Interface Module • Link Node Front End • Girder Integration • Test Devices & Status • Concluding Remarks
BLM Purposeh-dn • The BLM will be used for Two Purposes: • A: Inhibit bunches following an “above-threshold” radiation event. • B: Keep track of the accumulated exposure of the magnets in each undulator. • Purpose A is of highest priority. BLM will be integrated into the Machine Protection System (MPS) and requires only limited dynamic range from the detectors. • Purpose B is also desirable for understanding long-term magnet damage in combination with the undulator exchange program but requires a large dynamic range for the radiation detector (order of 106 ) and much more sophisticated diagnostics hard and software.
BLM Requirements pk • 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.*Beam Current threshold determination? • The thresholds will be empirically determined by inserting a thin obstruction upstream of the undulator. • Simulation of losses and damage in the undulator will proceed in parallel with the present effort.
BLM Project Updates • Design review held 1-24-08. • Descope March 2008 • Management Directive: no fundamental design modifications (lowest effort costs). • 2008 m&s costs reduced 400k to 75k. • FY 2008 BLM Project defined as R&D (not construction). • 33 installed units decreased to 5 for mps function only. • FY 2009 funding for remaining detectors pending. • Proceeding with Simulations and Empirical Testing to verify dosimeter function.
BLM Project Status • BLM Engineering Specification Document • Broken into 3 ESD’s. • Beam Line Detector (ANL, in progress). • Interface Module (ANL, completed). • Link Node Front End (SLAC, in progress). • Global electronic review complete (ready for fabrication pending testing, eric norum 4/16). • Global Schematic diagrams, block diagram, and parameter list (archived, Josh Stein, designer assignment?).
BLM Status - Detector • Beam Line Detector: • Detail and Assembly Drawings: (engineering review and tolerancing). • Detector Head. • Detector BFW Mounting Bracket. • Undulator Motion Tracking Adapter.
BLM Status - Detector • All material and components identified. • Vendor list compiled. • Stock procurements underway. • Long lead procurements (5/08). • Fabrication quotes and awards (6/08).
BLM Status – Interface Module (IM) • Prototype design complete. • Prototype board and enclosures fabricated. • Final enclosure design in process (stenciling?) • Bench and beam based testing plan.
BLM Status – Link Node Front End (slac) • Design in progress. • Procurements started. • Prototype boards in fabrication. • Bench and beam based test plan.
Beam Loss Monitor - Undulator Hardware (m. brown) In Undulator Hall Long Haul Cables
BLM Integration • Interface Module Girder Location. • BLM Detector Girder Identification (which five?). • Estop/IM Bracket Design (in progress). • Cable Plant details (z drops). • Power Supply from local control rack (cable length). • Installation Procedure. • Long haul cables defined and in process. • Link Node channels and rack distribution defined.
Detector Test Devices • Thru-put and beam test module • Design Complete • Cerenkov radiator in fabrication • Housing out for quote (qnty 3). • Procurements underway • APS Beam Pipe Detector (not tied to FY08 production) • Design Complete. • Detailed and assembly drawing (eng. review/tol.).
Concluding Comments • Overall blm program budget is thin. • Timetable is very aggressive. • On Schedule for October. • Calibration hardware needs to be solidified. • Simulation, test, calibration, operation plan. • BLM MOU scope FY2009?
BLM Status • End of Presentation
Introduction • Physics Requirements Document: Heinz-Dieter Nuhn 9-28-07 (prd: 1.4-005-r0 undulator beam loss monitor). • Scope Reduction: diagnostic to mps detector. • Purpose and Requirements. • ANL Budget: M&S (325k detector, ctls interface box 100k). • Detector Schedule: (design: nov-dec,drawings: dec-feb,pro/fab/assy: feb-jun,del: july, inst: aug-sep). • Organization: 4 groups, Group Definition: (controls, detector, simulation, test & calibration). • Design Highlights and System Overview (detectors: dynamic 33, static: 2, r&d fiber:1). • Detector design details and focus topics. • Funds are limited and efforts need to be focused to minimize costs (h-dn). • Simulation of losses and damage in the undulator will proceed in parallel with the present effort (pk).
ANL Draft BLM Budget • 425kM&S Total: • 325k Detector Development • detectors • mounting and slide systems • cables and fiber • 100k Controls Interface Box
LCLS MPS Beam Loss Monitor System Engineer: W. Berg Cost Account Manager: G. Pile Technical Manager: D. Walters Scientific advisor: P. Krejcik * FEL Physics: H. Nuhn * Scientific advisor: B. Yang FEL Physics: P. Emma * Controls/MPS Group Lead (ctls) : J. Stein Lead (mps): A. Alacron * Testing and Calibration Group Lead: B. Yang Detector Group Lead: W. Berg Simulations and analysis Group Lead: J. Dooling W. Berg J. Bailey J. Dooling L. Moog L. Emery M. Santana * J. Vollaire * B. Yang A. Brill L. Erwin R. Keithley J. Morgan M. Brown * R. Diviero J. Dusatko * S. Norum * A. Pietryla * Slac employee
MPS Beam Loss Monitor Group Functions • Controls Group:J Stein, A. Alacron • Develop BLM control and mps system: • Interface Box and Control. • PMT Signal Conditioning. • Control and MPS Integration and User Displays. • Detector Group: W. Berg • Develop Detector and Machine Integration. • Simulations and Analysis Group: J. Dooling • Provide collaborative blm simulation support and test analysis. • Test and Calibration Group: B. Yang • Provide beam based hardware testing programs and calibration plan.
System Design Highlights • 33 distributed detectors (one preceding each undulator segment), two static units (up and downstream of undulator hall). One additional channel reserved for r&d fiber based system. • MPS threshold detection and beam rate limiting. • Single pulse detection and mps action up to max 120Hz beam rep rate via dedicated mps link. • Monitoring of real time shot to shot signal levels and record integrated values up to one second. • Heart beat led pulser for system validation before each pulse up to full rep rate (pseudo calibration). • Remote sensitivity adjust (dynamic range) by epics controlled PMT dc power supply (600-1200V). • Calibrated using upstream reference foil (initial use cal will be determined from simulation studies).
Detector Design Highlights • Cerenkov Radiation Based (x-ray beam noise immunity). • Employs PMT for high sensitivity to beam losses. • Dynamic detector (tracks with undulator) 100mm stroke. Undulator position (in/out) detection will be used to set the corresponding mps threshold levels. • Manual static insertion option via detachable arm for special calibration and monitoring. • Large area sensor (coverage of the full horizontal width of the top and bottom magnet blocks). • Fiber Out for low gain upgrade (full integration and dyn range diagnostic), control system expandable to 80 channels. • Radiation hard components (materials and electronics).
Vendor List • Radiator Substrate water jet and final polish (lap and flame) (quartz)- VA Optical • Radiator AlSi coating – Eddy Company • Radiator Material - Corning • PMT and Magnetic Shield - Hamamatsu • Connectors: • SMA Fiber Feed through) -Thor Labs • High Voltage Feed through - Kings • SMB Signal Fed through - AMP • Fiber Optic Cable (heartbeat) Fiber (fused silica) - Stocker Yale • Fiber Optics Cable, UV Grade – Coastal Connections • Signal Cable – Belden • Body Fabrication- M1, High Tech, AJR Industries • Miscellaneous Hardware (fasteners, o-rings, flex coupling, spanner wrench) – McMaster-Carr • Linear Bearing Assembly – IKO International • Spherical Bearing – Aurora Bearing