Related Manuals for Bergoz LR-BPM
Summary of Contents for Bergoz LR-BPM
- Page 1 USER MANUAL LR BPM Log – ratio Beam Position Monitor Log-ratio Beam Position Monitor User’s Manual Rev. 4.0 More than 40 years of experience recognized in the world of particle accelerators...
- Page 2 CONNECTORS PINS ALLOCATION Rev. 2.1 Optional output signals: LogA, LogB, LogC and LogD pin assignment on DIN41612M LR-BPM module rear connector has been corrected to resp. b31*, b223, b28* and B25*. Note to users of BPM-RFC chassis with BPM-RFC/ABCD option: The locations of chassis rear panel SMA output connectors LogA, LogB, LogC and LogD are unchanged.
- Page 3 LR-BPM User Manual Version 4.0 DISTRIBUTORS U.S.A. Japan GMW Associates Hayashi-Repic Co., Ltd. www.gmw.com www.h-repic.co.jp sales@gmw.com sales@h-repic.co.jp India China GEEBEE International Beijing Conveyi Limited www.geebeeinternational.com www.conveyi.com info@geebeeinternational.com sales@conveyi.com South Korea Seyoung Co., Ltd www.seyoungsys.com apark@seyoungsys.com...
- Page 4 LR-BPM User Manual Version 4.0...
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Page 5: Table Of Contents
RETURN PROCEDURE ......................4 SAFETY INSTRUCTIONS ......................4 BEAM POSITION MONITOR SYSTEM ..................5 Determine which LR-BPM model you received ..............6 MODES OF OPERATION FOR VARIOUS BEAMS ..............8 Sample & Hold (S&H) Mode ....................8 Track & Hold (T&H) Mode ....................8 Track Continuous (T) Mode .................... - Page 6 QUICK CHECK: LR-BPM IN TRACK CONTINUOUS MODE.............24 Beam displacement ......................25 Explore the dynamic range ....................28 Noise spectrum .........................29 LR-BPM REACTION TIME TO BEAM POSITION CHANGE ............30 SIGNALS ..........................31 Input signals ........................31 Output signals for ADC ......................31 Auxiliary Output Signals ....................31 External Trigger Input and Trigger Gate ................32...
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Page 7: Initial Inspection
Bergoz Instrumentation or its local distributor before return of goods. Bergoz Instrumentation will repair or replace any product under warranty at no charge. For products in need of repair after the warranty period, Bergoz Instrumentation will assess the technical issue and send a quote to the purchaser/customer. The purchaser/customer must provide a purchase order before repairs can be initiated. -
Page 8: Return Procedure
The return of this repaired product under warranty back to the customer is paid by Bergoz Instrumentation. Return of product out of warranty should be made prepaid or will be invoiced. Bergoz Instrumentation will not accept freight-collect shipments. Shipments should be made via UPS, FedEx or DHL. -
Page 9: Beam Position Monitor System
LR-BPM User Manual Version 4.0 BEAM POSITION MONITOR SYSTEM This manual applies to the Log-ratio BPM only: LR-BPM “MX-BPM”, “S-BPM” and “BB-BPM” are described in other manuals. The Log-ratio BPM system includes: Description Order code Log-ratio BPM electronics module LR-BPM-XXXMHz Sample &... -
Page 10: Determine Which Lr-Bpm Model You Received
Determine which LR-BPM model you received LR-BPM version-1 have serial numbers < #955. They are described in another manual. If you have a Version-1 unit, please ask Bergoz Instrumentation or your distributor to send the LR-BPM User’s Manual version 1.x. - Page 11 LR-BPM User Manual Version 4.0 LR-BPM version-2.1 with Beam Trigger option LR-BPM-TRG can be recognized by: The printed circuit board is equipped with a log amplifier limiter circuit: Beam Trigger circuit Page 7...
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Page 12: Modes Of Operation For Various Beams
LR-BPM User Manual Version 4.0 MODES OF OPERATION FOR VARIOUS BEAMS LR-BPM can be equipped with many options, then further configured by the user to support many modes of operation: Sample & Hold (S&H) Mode Note: Requires Sample&Hold option LR-BPM-SH to be mounted on the printed circuit board. -
Page 13: Options
In addition to the Sample & Hold option described in the preceding chapter, other options are available: Built-in Beam Trigger “LR-BPM-TRG” option Note: Requires Built-in Beam Trigger option LR-BPM-TRG to be mounted on the printed circuit board. Particle polarity LR-BPM version 2.1 operates with positive and negative... -
Page 14: Access To Straps And Switches
To remove shield: Remove screws (2) from underside LR-BPM modules can be inserted/removed while the power is ON. The LR-BPM module is equipped with many on-board potentiometers to adjust the log amplifiers gain, slope and intercept point. They require precise instruments, tools and procedures for their adjustment. -
Page 15: Lr-Bpm Principle Of Operation
LR-BPM User Manual Version 4.0 LR-BPM PRINCIPLE OF OPERATION The signals from the pickup electrodes are processed simultaneously thru four independent channels. Each channel consists of an input band-pass filter, followed by an amplification chain with logarithmic response. When a single short pulse is applied to the band-pass filter, it will oscillate at its own resonant frequency for about 250 ns, allowing enough time for the logarithmic amplifier to detect the log of its envelope. -
Page 16: Agreement On Axes & Signs
LR-BPM User Manual Version 4.0 AGREEMENT ON AXES & SIGNS X, Y: User’s orthogonal axes U, V: LR-BPM pickup axes AC and BD : gain obtained by an amplifier with adjustable gain ROTATED PICKUPS ORTHOGONAL PICKUPS α = 90° α = 90°... -
Page 17: Sample & Hold Mode
LR-BPM User Manual Version 4.0 SAMPLE & HOLD MODE Set switches to: Mode: Sample&Hold (DOWN) Processing: Sample&Hold (LEFT position) Timing: Sample&Hold (LEFT position) Built-in Beam Trigger: As desired ADC Trigger Output Edge: As desired Mode Processing Built-in Beam Trigger DOWN / UP... -
Page 18: Track & Hold Mode
LR-BPM User Manual Version 4.0 TRACK & HOLD MODE Set switches to: Mode: Track&Hold (DOWN) Processing: Track&Hold (RIGHT position) Timing: Track&Hold (RIGHT position) Built-in Beam Trigger: As desired ADC Trigger Output Edge: As desired Mode Processing Built-in Beam Trigger DOWN / UP... -
Page 19: Track-Continuous Mode
Negative delay before sampling Note: Built-in Beam Trigger (Option LR-BPM-TRG) will not operate above 5 MHz bunch repetition rate Output signals XOUT and YOUT track the position given by A, B, C and D inputs with 5 MHz bandwidth. Page 15... -
Page 20: Changing Pickup Configuration
LR-BPM User Manual Version 4.0 CHANGING PICKUP CONFIGURATION The pickup configuration is set with two jumpers. To change the configuration from “Rotated” to “Orthogonal” or vice versa, change the jumper position: Rotated pickups, position of jumpers Jumpers position for “Rotated”... -
Page 21: Quick Check: Lr-Bpm In Sample&Hold Mode
10-nC bunch seen by four pickups of 5 pf capacitance and width = 1/8 of circumference. Use 4 similar attenuators, each 3 dB. The same test can be done with 5 and 10 dB. Note: Attenuators are seldom more precise than ±0.1 dB. This will be reflected upon the LR-BPM X and Y zero readings. -
Page 22: Auxiliary Trigger Output
LR-BPM User Manual Version 4.0 Auxiliary trigger output Observe the Auxiliary trigger from LR-BPM. This trigger is used for oscilloscope triggering. Input signal from Fast Pulse generator (50 Ω): Output DB9 pin 9 TRG.OUT.AUX (1-MΩ): Trigger TRG.OUT.AUX comes ~13 ns after bunch... -
Page 23: Xout And Yout Zero Offsets
Auxiliary outputs X and Y are available on DB9 pin 1 and pin 2 respectively. XOUT and YOUT Zero Offsets If the signals applied to all four LR-BPM inputs were exactly equal, and if the LR-BPM module were perfect, the values of X and Y would be exactly 0 Volt. - Page 24 Attenuator C is removed from input C, and added to input A, thus simulating a displacement of the beam towards C (stronger signal on C pickup). LR-BPM modules are factory preset: • For orthogonally placed pickups: up, down, left and right •...
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Page 25: Noise Measurement
LR-BPM User Manual Version 4.0 Noise measurement X and Y outputs exhibit noise. The following test gives a feel of the noise, without the need for a sophisticated data acquisition system. An oscilloscope takes a single sweep of Xout and Yout. Its timebase is set to display –in a single sweep–... -
Page 26: Quick Check: Lr-Bpm In Track&Hold Mode
10-nC bunch seen by four pickups of 5 pf capacitance and width = 1/8 of circumference. Use 4 similar attenuators, each 3 dB. The same test can be done with 5 and 10 dB. Note: Attenuators are seldom more precise than ±0.1 dB. This will be reflected upon the LR-BPM X and Y zero readings. - Page 27 XOUT or YOUT “Good” X and Y signals ~70n Next, proceed thru the same tests as “QUICK CHECK: LR-BPM in Sample & Hold Mode”: • XOUT and YOUT Zero Offsets • Simulating beam position changes Noise measurement cannot be performed as easily in Track&Hold mode, because the output signal is held only ~70ns.
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Page 28: Quick Check: Lr-Bpm In Track Continuous Mode
Amplitude ca. -10 dBm Use 4 similar attenuators, each 3 dB. The same test can be done with 5 and 10 dB. Note: attenuators are seldom more precise than ±0.1 dB. This will be reflected upon the LR-BPM X and Y readings. -
Page 29: Beam Displacement
Connect to Test Kit or 19” BPM-RFC chassis to AC mains, the DVM (or oscilloscope) will display X and Y values. If the RF signals applied to all four LR-BPM inputs were exactly equal, and if the LR-BPM module were perfect, the values of X and Y would be exactly 0 Volt. - Page 30 Please note these are displacements. Take the zero offsets due to power splitter imbalance and attenuators inequality into consideration. LR-BPM modules are factory preset: • For orthogonally placed pickups: up, down, left and right • For rotated pickups: upper-right, upper-left, lower-left and lower-right.
- Page 31 LR-BPM User Manual Version 4.0 The above voltages are representations of the algorithms: For Orthogonal pickups: • X = K Log(A/C) • Y = K Log(B/D) For Rotated pickups: • X = K [Log(A/C) – Log(B/D)] cos(β) • Y = K [Log(A/C) + Log(B/D)] sin(β).
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Page 32: Explore The Dynamic Range
Lower-left has 6.5 dB more signal than all others Left pickups have both 6.5 dB more signal than right pickups. This plot is taken with an LR-BPM configured for rotated pickups. In a hypothetical 1-MHz ƒrev synchrotron with 1-cm buttons in 4-cm dia. vacuum chamber... -
Page 33: Noise Spectrum
LR-BPM User Manual Version 4.0 Noise spectrum Observe the noise spectrum with an FFT or baseband spectrum analyzer, at various input signal levels. The output noise spectrum looks like: Noise over 1 kHz to 30 MHz bandwidth, with 100 kHz resolution bandwidth. -
Page 34: Lr-Bpm Reaction Time To Beam Position Change
LR-BPM User Manual Version 4.0 LR-BPM REACTION TIME TO BEAM POSITION CHANGE LR-BPM can be used for fast interlock machine protection systems: Time delay from a beam position change to Output signal half-height rise is ~120 ns Output risetime is ~65 ns... -
Page 35: Signals
Output Impedance 100 Ω. SUM&TG.GND Ground for SUM.OUT -and- TG.ADC.OUT VPHOUT Phase angle output ±9V = ±90° RF to Phase reference angle (LR-BPM with BPPM option only) Auxiliary Output Signals XOUT.AUX Same as XOUT, but 50-Ω output impedance YOUT.AUX Same as YOUT, but 50-Ω output impedance XYGND Analog ground for XOUT.AUX and YOUT.AUX... -
Page 36: External Trigger Input And Trigger Gate
Pull down for Track-Continuous mode. Pullup resistor 4K7 to 5V. Ground for above signals. Common external controls Common external controls are controls which are common to all BPM modules in a BPM chassis. None are handled by LR-BPM Page 32... -
Page 37: Connectors Pins Allocation Rev. 2.1
LR-BPM User Manual Version 4.0 CONNECTORS PINS ALLOCATION Rev. 2.1 DB15 female connector on BPM-RFC rear panel (one connector per BPM station) DIN41612M LR-BPM module rear connector DB9 female connector on LR-BPM front panel INPUT SIGNALS Input A BUTA b2 *... -
Page 38: Bpm Cables Layout Installation
BPM CABLES LAYOUT INSTALLATION Cables electrical length must be equal within ±1ns. Yet, unlike most BPM electronics, the LR-BPM module does not require the input signals to be in phase. It tolerates any phase change, even 180°. Unnecessary intermediate connectors should be avoided. When –for practical reasons–... -
Page 39: Bpm Chassis
LR-BPM User Manual Version 4.0 BPM CHASSIS Specifications The BPM-RFC/X chassis is built around a 19” Schroff rackable RF chassis. Dimensions of the bin: 3U x 84F Schroff reference: Europac Lab HF/RF #20845-283 The BPM-RFC/X is available equipped for 1 up to 16 BPM stations. X being the number of stations. -
Page 40: Outer Dimensions
LR-BPM User Manual Version 4.0 Outer dimensions Front view 10,4 37,5 57,1 37,5 465,1 483,0 Top view Warning: Leave clearance at top and bottom 302,2 to allow free air flow for convection cooling. Allow 10W max. heat dissipation per module installed in chassis. -
Page 41: Bpm Module Rear Connector Din41612M 24+8
BPM MODULE REAR CONNECTOR DIN41612M 24+8 Note: For connections, See Connector Pins Allocation, this manual. BPM chassis for 1 up to 16 BPM modules are part of Bergoz Instrumentation sales program (BPM-RFC/X) and include the necessary mating connectors (See BPM chassis, this manual). - Page 42 If you have any questions, feel free to contact us by e-mail info@bergoz.com Bergoz Instrumentation – 156, rue du Mont Rond – Espace Allondon Ouest – 01630 SAINT GENIS POUILLY – France Tél. : +33 (0) 459 42 66 42 Fax : +33 (0) 450 42 66 43 – bergoz@bergoz.com www.bergoz.com...
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