LCLS Undulator Systems Beam Loss Monitor Status Report, FAC 6.17.08

1. LCLS Undulator SystemsBeam Loss MonitorStatus Report, FAC 6.17.08 William Berg ANL/APS Diagnostics Group

2. Introduction • Purpose & Requirements • Project Scope Update • Global System Status & Schedule • Detector • Interface Module • Link Node Front End • Girder Integration • Test Devices & Status • Concluding Remarks

3. 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.

4. 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.

5. 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.

6. 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?).

7. BLM Detector Schedule

8. BLM Status - Detector • Beam Line Detector: • Detail and Assembly Drawings: (engineering review and tolerancing). • Detector Head. • Detector BFW Mounting Bracket. • Undulator Motion Tracking Adapter.

9. 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).

10. Rendering of Detector

11. Cross Section of BLM Detector

12. Undulator Inserted Position

13. Pin Function

14. BLM Interface Module Schedule

15. 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.

16. Interface Module Board

17. Interface Module Enclosure

18. BLM Status – Link Node Front End (slac) • Design in progress. • Procurements started. • Prototype boards in fabrication. • Bench and beam based test plan.

19. Beam Loss Monitor - Undulator Hardware (m. brown) In Undulator Hall Long Haul Cables

20. 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.

21. Interface Module Girder Location

23. Tunnel Cable Drops

24. 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.).

25. Test Module Rendering

26. Test Module Drawing

27. Cerenkov Radiator Fabrication

28. Radiator Blocks (actual uv grade material)

29. Radiator Blocks (actual uv grade material)

30. 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?

31. BLM Status • End of Presentation

32. 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).

33. ANL Draft BLM Budget • 425kM&S Total: • 325k Detector Development • detectors • mounting and slide systems • cables and fiber • 100k Controls Interface Box

34. Draft schedule

35. 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

36. 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.

37. 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).

38. 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).

39. BLM Interconnect Diagram m. brown

40. Interface Box Location

41. Plan View of Short Drift

42. BFW Pump Out Port Relocation

43. Removable Pin for Manual Insertion

44. Undulator Inserted Position

45. Undulator Retracted Position

46. Detector Pin Detail

47. Cerenkov Radiator

48. Magnet Block Sensor Coverage

49. Proposed PMT Device -04 (420nm)

50. 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