LCLS Undulator Systems
Beam Loss Monitor
Status Report, FAC 6.17.08
William Berg
6.17.08
Beam Loss Monitor
ANL/APS Diagnostics Group
William Berg
berg@aps.anl.gov
Introduction
• Purpose & Requirements
• Project Scope Update
• Global System Status & Schedule
– Detector
– Interface Module
– Link Node Front End
• Girder Integration
• Test Devices & Status
• Concluding Remarks
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Purpose
h-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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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?).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Detector Schedule
BLM Schedule FY 2008
march
april
may
x
x
june
july
x
x
x
x
aug
sept
x
x
oct
detector assembly
production
detector design lock
x
assembly draw ing set
procurements
x
detector fabrication
detector assembly
x
x
ship to slac
x
installation
x
testing
detector design prototype
x
prototype assembly draw ings
x
prototype fabrication
x
prototype testing (beam)
6.17.08
Beam Loss Monitor
x
x
x
x
William Berg
berg@aps.anl.gov
BLM Status - Detector
• Beam Line Detector:
– Detail and Assembly Drawings:
(engineering review and tolerancing).
• Detector Head.
• Detector BFW Mounting Bracket.
• Undulator Motion Tracking Adapter.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Rendering of Detector
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Cross Section of BLM Detector
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator Inserted Position
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Pin Function
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Interface Module Schedule
BLM Schedule FY 2008
march
april
may
june
july
aug
sept
x
x
x
oct
interface module
production
design lock
x
enclosure assembly draw ing
x
procurements
x
module fabrication
module assembly
x
ship to slac
x
installation
x
testing
prototype board
bench testing
beam based testing (aps)
6.17.08
Beam Loss Monitor
x
x
x
x
x
x
x
William Berg
berg@aps.anl.gov
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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Interface Module Board
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Interface Module Enclosure
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Status – Link Node Front End (slac)
• Design in progress.
• Procurements started.
• Prototype boards in fabrication.
• Bench and beam based test plan.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Beam Loss Monitor - Undulator Hardware
Undulator
Beam Loss
Detector
(8)
FIBER
LED
PMT
&
BASE
HV POWER
SUPPLY
(m. brown)
8
8
8
LED PULSER BOARD
TRIGGER
CUSTOM
GATED INTEGRATOR
( IP )
HVPS CONTROL
LED PULSER AMPL.
( IP DAC )
HVPS READ BACK
( IP ADC )
LINK NODE
CHASSIS
FPGA
Power
ColdFire
I/O
*
In Undulator Hall
MPS
LINK
119MHz +
FIDUCIAL
Timing
Fanout
*
Long Haul Cables
AC POWER
Control
System
MPS
Network
Timing
Distribution
*Fiber
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Interface Module Girder Location
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Tunnel Cable Drops
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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.).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Test Module Rendering
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Test Module Drawing
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Cerenkov Radiator Fabrication
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Radiator Blocks (actual uv grade material)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Radiator Blocks (actual uv grade material)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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?
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Status
End of Presentation
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
ANL Draft BLM Budget
• 425k M&S Total:
• 325k Detector Development
• detectors
• mounting and slide systems
• cables and fiber
• 100k Controls Interface Box
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Draft schedule
Detector
nov
dec
x
x
design
component drawings
assembly drawing
procurements
x
jan
feb
march
x
x
x
6.17.08
Beam Loss Monitor
x
july
x
x
aug
sept
x
x
x
fabrication
installation
x
june
x
x
ship to slac
may
x
design lock
assembly
april
x
William Berg
berg@aps.anl.gov
LCLS MPS Beam Loss Monitor
System Engineer: W. Berg
Cost Account Manager: G. Pile
Scientific advisor: P. Krejcik *
Scientific advisor: B. Yang
Controls/MPS Group
Lead (ctls) : J. Stein
Lead (mps): A. Alacron *
M. Brown *
R. Diviero
J. Dusatko *
S. Norum *
A. Pietryla
Detector Group
Technical Manager: D. Walters
FEL Physics: H. Nuhn *
FEL Physics: P. Emma *
Simulations and
analysis Group
Testing and Calibration
Group
Lead: W. Berg
Lead: J. Dooling
A. Brill
L. Erwin
R. Keithley
J. Morgan
L. Emery
M. Santana *
J. Vollaire *
B. Yang
Lead: B. Yang
W. Berg
J. Bailey
J. Dooling
L. Moog
* Slac employee
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Interconnect Diagram
6.17.08
Beam Loss Monitor
m. brown
William Berg
berg@aps.anl.gov
Interface Box Location
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Plan View of Short Drift
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BFW Pump Out Port Relocation
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Removable Pin for Manual Insertion
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator Inserted Position
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator Retracted Position
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Detector Pin Detail
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Cerenkov Radiator
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Magnet Block Sensor Coverage
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Proposed PMT Device -04 (420nm)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
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
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
UV Grade Fiber
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Fused Silica Radiator
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM System Support Focus Topics
•
Funding of beam based prototyping and test program.
•
Implementation of upstream calibration foil (alt. profile monitor/halo).
•
BFW prototype tolerance verification (system tolerance in LTT)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Summary
•
Undulator magnets protection is critical for machine commissioning period.
•
BLM system is now defined as a component of the mps (descope) with an
upgrade path to a diagnostic (low gain detector).
•
Calibration plan and hardware is vital to proper system operation (threshold
detection will use empirically derived levels).
•
Schedule for development of the blm program is very aggressive and funding is
limited.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Detector Summary
•
Building a detector based on cerenkov radiation and PMT detection.
•
36 distributed channels (2 static devices) capable of single pulse detection (up to full rep
rate) with rate limiting reaction.
•
Detectors dynamically track with undulator position with manual detach option to remain
in a fully inserted static position.
•
Adjustable PMT sensitivity with remotely controlled high voltage power supply.
•
Keep alive system test (led pulser) before each beam pulse.
•
All Vendors have been identified, Quotes in progress, Drawing set being reviewed.
•
Installation does not require access into the vacuum system or removal of other
components.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
End of Presentation
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Parts Animation
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator System
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM System Support Focus Topics
1.
Assignment of Eric Norum to controls design oversight and testing.
2.
*Funding of beam based prototyping and test program.
3.
Group Leaders to significantly step up direct involvement in system
oversight, program implementation, and schedule tracking (controls:
n. arnold, diag: g. decker, lcls: g. pile, ops/analysis: m. borland).
4.
Active participation in simulations and simulation priority from slac.
5.
*Implementation of upstream profile monitor (halo or at min. cal foil).
6.
Adequate analysis and shielding of upstream beam dump.
7.
Develop long term collaboration plan for the pursuit of determining
magnet damage mechanisms and thresholds via empirical methods.
8.
9.
Determine need and priority of BLM signal integration (diagnostic).
BFW prototype verification (system tolerance LTT)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Summary










Undulator magnets protection is critical for machine commissioning period.
Schedule for development of the blm program is very aggressive and funding is limited.
System design and fabrication must go in parallel with simulation and testing program.
Consider Minimum requirements for first level implementation. Taking advantage of
existing mps infrastructure.
BLM system is now defined as a component of the mps with an upgrade path to a
diagnostic (low gain detector).
36 distributed channels (2 static devices) capable of single pulse detection and rate
limiting reaction.
Detectors track with undulator position with detach option for manual operation.
Calibration plan and hardware is vital to proper system operation (threshold detection will
use empirically derived levels).
Quotes in progress
Drawing set being reviewed
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Controls Architecture
pk
The BLM PMT interfaces to the MPS link node chassis.
The IO board of the MPS link node chassis provides the
ADC & DAC for the PMT.
A detector interface box (pmt, led pulser, sig con?) is the
treaty point between the MPS and the undulator BLM.
There are 5 link node chasses serving up to 8 BLMs along
the undulator (expandable from 8 to16 channels).
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator Hardware
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Spares
Spares
LINK
NODE
6.17.08
Beam Loss Monitor
LINK
NODE
LINK
NODE
LINK
NODE
LINK
NODE
William Berg
berg@aps.anl.gov
Beam Loss Monitors with Link Nodes
Use Link Node to
support analog I/O IndustryPack modules
provide analog readouts to control system
set threshold levels
control HV power supplies
control LED Pulser
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Segment Design Layout
m. brown
MPS
Link
Node
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Locking Pin Detail
(moves with undulator)
Flex Joint
Spherical Bearing
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Beam Loss Monitors using Link Nodes
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Proposed PIC / BLM Timing
The proposed trigger timing for the BLM and PIC Systems will be derived from 119MHz with
Fiducial ( i.e.nomial Fido signal )
119 MHz
FIDUCIAL
The MPS Link chassis will receive this signal on a trigger input and will output a trigger for the
BLM or PIC IP Modules.
PIC TIMING
FIDUCIAL
or Trigger near
Fiducial time
FIDUCIAL
or Trigger near
Fiducial time
INTEGRATION
WINDOW = 2.5 mSec
DELAY = 0
2.5 mSec
BLM TIMING
FIDUCIAL
FIDUCIAL
INTEGRATION
WINDOW = 20uSec
DELAY = 1020 uSec
6.17.08
Beam Loss Monitor
1020 uSec
William Berg
berg@aps.anl.gov
Link Node Block Diagram
MPS Fiber Link
Input Ifc Bd 1
PC
Laptop
USB Ifc
SFP
(Opto-Isolators)
Fault
Inputs
(96)
Local Debug Port
Interface
Transceivers
FPGA
Vitrex-4
XC4VFX20
Coldfire
Computer
Ethernet
(RTEMS/EPICS)
Input Ifc Bd 6
Output Ifc Bd
(Opto-Isolators)
Node
Address
Switches
From
EVR
Gereral-Purpose
TTL I/O
Mitigation
Device
Outputs
(8)
GPIO for status, ctrl, etc.
(Unused Trigger I/O signals)
4
Trigger I/O
To other
devices
MPS
Devices
(Opto-Isolators)
Industry Pack
Module 1
Signal
Cond Board
Industry Pack
Module 2
Signal
Cond Board
Industry Pack
Module 3
Signal
Cond Board
Industry Pack
Module 4
Signal
Cond Board
4
Trigger I/O can be
configured as
needed
Industry Pack
Interface
MPS Link Node – Functional Block Diagram
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Undulator Protection Requirements
Inputs to inhibit the e-beam
Primary protection from a number of Beam Loss
Monitors (BLMs) along the undulator
Secondary protection from control system
monitoring of
BPM orbit
Magnet power supply status
Magnet mover status
Long-term monitoring of the radiation dose
Dosimeters attached to the magnets
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Rolls Out with Undulator Magnet
The BLM is mounted to tightly surround the
vacuum pipe near the beam finder wire
It is on a linear slide so that it can be moved off the
beam when the undulator magnet is rolled out
An detachable arm makes the BLM and magnet roll out
together
The BLM will automatically be less sensitive to
beam loss when the undulator is in the out position
The BLM can be manually inserted on the beam pipe for
special calibration procedures
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Specification
A single BLM will be placed in each of the
gaps between undulator modules.
Design is to maximize the sensitivity of the
monitor
Located as close as possible to the beam axis
as the vacuum chamber allows
Choose a sensitive Cerenkov medium coupled
to a high gain photomultiplier tube
The detector will not be segmented to provide
transverse position information of the losses
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM reliability and self test
Each loss monitor is equipped with a LED
that flashes between beam pulses.
Provides a pre-beam test of the BLM system
before beam is sent through the undulator
Provides a stay-alive signal for the control
system to monitor the BLM system during
operation
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM dynamic range
For simplicity and cost the BLM will be optimized
for maximum sensitivity
And allowed to saturate the signal if a large loss
occurs
The trip threshold is still exceeded if the device saturates
so the MPS will still trip and protect the undulator
Monitoring of the loss signal to integrate the dose
received by the undulator will not be valid if the device
saturates
However, if large losses are anticipated such as when
the beam finder wires are inserted, the gain of the PMT
will be reduced to prevent saturation.
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Signal Monitoring
The BLM has a fast, dedicated link to the
MPS to shutoff the beam within 1 pulse
The local MPS link node chassis also has a
‘slow’ network connection to the control
system via channel access
Allows monitoring of the BLM level at any time
Reads back and controls the PMT voltage
Controls the LED test pulse
Controls the threshold set point for MPS trips
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
BLM Controls Architecture
The BLM PMT interfaces to the MPS link
node chassis
The IO board of the MPS link node chassis
provides the ADC & DAC for the PMT
A cable interface box is the treaty point
between the MPS and the undulator BLM
There are 5 (? verify this number) link node
chasses serving up to 8 BLMs along the
undulator (a diagram would help here)
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
Future expansion
The link node chassis can handle more than
the present number of installed BLMs
During commissioning a long fiber BLM will
also be tested
It is compatible with the link node chassis
controls
6.17.08
Beam Loss Monitor
William Berg
berg@aps.anl.gov
MPS Overview
6.17.08
Beam Loss Monitor
(m. brown)
William Berg
berg@aps.anl.gov
System Roll

6.17.08
Beam Loss Monitor
r2  sin 2  r1  sin 1 
A  cos  1 
William Berg
berg@aps.anl.gov