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Bergoz CWCT User Manual

Cw current transformer beam current monitor for cw beams and macropulses
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USER MANUAL
CWCT & BCM-CW-E
CW Current Transformer
Beam Current Monitor for
CW beams and Macropulses
Rev 2.0
More than 40 years of experience recognized in the world of particle accelerators

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  • Page 1 USER MANUAL CWCT & BCM-CW-E CW Current Transformer Beam Current Monitor for CW beams and Macropulses Rev 2.0 More than 40 years of experience recognized in the world of particle accelerators...
  • Page 2 Modification of the cover page and creation of the distributors’ page 01/2020 Additions and corrections in the section USB communication 01/2020 Corrections concerning BCM-CW-E and firmware revisions 10/2020 Update of CWCT Test Kit 1, GUI and General Specifications; plus minor corrections 1.5. 03/2021 Improved description of USB communication 07/2024...
  • Page 3 CWCT & BCM-CW-E Version 2.0 User Manual 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 CWCT & BCM-CW-E Version 2.0 User Manual...

  • Page 5: Table Of Contents

    Standard CWCT and BCM-CW-E ..................12 LC-CWCT and BCM-CW-E ....................12 QUICK CHECK ........................13 Current Transformer Test Fixture ..................13 BCM-CW-E + CWCT Current Measurement Example Setup ..........15 Setup ..........................16 GRAPHICAL USER INTERFACE ..................... 20 Installation ......................... 20 BCM-CW-E communication ....................

  • Page 6: 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 7: 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 8: Cwct & Bcm-Cw-E Set

    • BCM-RFC/xx 19” RF-shielded chassis for BCM-E modules of all versions with power supply • BCM-C-xxx CWCT to BCM-RFC chassis interconnect coaxial cable with PEX dielectric and SMA connectors with PTFE dielectric • Option: BCM-RHC-xxx CWCT to BCM-RFC chassis interconnect coaxial cable with PEX dielectric and SMA connectors with PEEK dielectric.

  • Page 9: General Description

    CWCT current sensor and BCM-CW-E electronics are designed to measure average currents of CW beams and macropulses. The CWCT is a current transformer with strict limits on lower and upper cut-off frequencies, tailored to the beam properties. Its lower cut-off assures that droop between bunches is negligible, yet high enough to allow full differentiation of its output signal as quickly as possible.

  • Page 10: Low Current Option

    Low Current Option For currents below 50 µA, the Low-Current option is available. A front-end amplifier is mounted on the CWCT sensor to amplify the signal before its transportation to the BCM- CW-E. With this option it is possible to measure currents with a resolution down to 8 nA rms.

  • Page 11: In-Flange Cwct Models

    • Option BK185C allows bake out up to 185°C (365°F) • Option BK200C allows bake out up to 200°C (392°F) CWCT wall current break (“gap”) is a ceramic ring (Al2O3 99.7%) brazed onto two Kovar transition sleeves. Standard models are made from AISI 304 steel, AISI 316LN is available on option.

  • Page 12: Mechanical Dimensions And Drawings

    CWCT-CF12"-198.4-40-UHV-xx 12” 8" DN/NW250CF 198.4 CWCT-CFXX"-XXX-XX-UHV-xx 40.0 Drawings Drawings in .pdf can be found on our website: www.bergoz.com :: CWCT & BCM-CW-E :: Downloads :: Technical drawings Dimensions missing on the website can be obtained by contacting info@bergoz.com Page 8...

  • Page 13: Bcm Chassis

    CWCT & BCM-CW-E Version 2.0 User Manual BCM Chassis The BCM-RFC/xx chassis is based on a 19” Schroff rackable RF chassis. Bin dimensions: 3U x 84F Schroff reference: Europac Lab HF/RF #20845-283 The BCM-RFC/xx can be wired with up to 6 BCM-E stations, xx being the number of wired stations (e.g.

  • Page 14: Bcm-Cw-E Front Panel Description

    Version 2.0 User Manual BCM-CW-E front panel description Signal View: CWCT Signal, after input amplification (50 Ω readout). Output View: Baseline output voltage proportional to the average input current (1 MΩ readout). This signal follows beam current fluctuations within 1µs, permitting fast detection of beam loss.

  • Page 15: Bcm-Rfc Rear Panel Description

    Output voltage proportional to the average beam current (1 MΩ readout). Pins DB9,1; DB9,4; DB9,5; DB9,7; DB9,9: connected to GND BCM Input: BCM-CW-E input signal from the CWCT. BCM Output: Full bandwidth output voltage proportional to the average beam current (50 Ω...

  • Page 16: Measured Ranges

    CWCT & BCM-CW-E Version 2.0 User Manual MEASURED RANGES Standard CWCT and BCM-CW-E CWCT and BCM-CW-E typical performances and measurement ranges are shown below: Remote control Remote control BCM-CW-E output BCM output DB9, 8 DB9, 3 100 mA 0dB GAIN...

  • Page 17: Quick Check

    Before installation in the accelerator, different bench tests can be performed to get familiar with the CWCT and the BCM-CW-E. The input signal can be provided by an RF signal generator, square wave generator or CW pulse generator, as described below in the quick check setup.
  • Page 18 CWCT & BCM-CW-E Version 2.0 User Manual Page 14...

  • Page 19: Bcm-Cw-E + Cwct Current Measurement Example Setup

    • BCM-RFC/xx chassis • RF Pulse generator, 15MHz minimum, with a 50% Duty cycle trigger output or a second output channel, preferably capable of operating at the nominal CWCT/BCM-CW-E frequency. • Programmable delay line allowing delay adjustment up to 60ns in 50ps steps preferably •...

  • Page 20: Setup

    CWCT & BCM-CW-E Version 2.0 User Manual Setup Default State Ex-factory default state: Gain Control thru “Remote control” DB9. CWCT Test Kit 1 Gain: 0 dB Gain: 20 dB Gain: 40 dB Isolated Example: 100MHz / 1V Programmable delay line BCM-CW-E which have been controlled by USB may be left in a state other than Ex- factory default state.
  • Page 21 4) Connect the Pulse generator output to the CWCT test fixture SMA input. 5) Connect CWCT test fixture SMA output to a 50Ω Load. 6) Connect CWCT output SMA to the “BCM input” SMA located on the chassis rear panel. 7) Connect Trigger Output from Pulse generator to the Programmable delay line.
  • Page 22 CWCT & BCM-CW-E Version 2.0 User Manual 16) Turn ON the Pulse Generator Visualize “Timing View”, “Signal View”, “BCM Output”, and “Output View”. Adjust the delay line to get a good baseline measurement. In case “Signal View” is not well visible, select a higher gain.
  • Page 23 Connected to any GND Pin: DB9,1; DB9,4; DB9,5; DB9,7; DB9,9 DB9,8 All output voltages are proportional to the average current passing the CWCT aperture. The transfer functions to get the current from the output voltages are indicated in the calibration report.

  • Page 24: Graphical User Interface

    User Manual GRAPHICAL USER INTERFACE Bergoz Instrumentation provides a GUI to communicate with the BCM-CW-E via USB. It allows to control the BCM-CW-E settings and to acquire the BCM-CW-E output signal. This software was developed with LabVIEW 2014. It is provided as a Microsoft Windows compatible executable file.

  • Page 25: Bcm-Cw-E Communication

    CWCT & BCM-CW-E Version 2.0 User Manual BCM-CW-E communication 1) Connect the USB cable from the BCM-CW-E front panel USB port to the PC. 2) Windows automatically recognizes the device and loads the USB CDC serial driver. 3) In the device manager, look for the serial COM port number associated to the BCM-CW- BCM-CW Firmware x.x...

  • Page 26: Gui User's Guide

    CWCT & BCM-CW-E Version 2.0 User Manual GUI user’s guide The graph is displaying the BCM-CW-E output voltage as measured by the on-board PIC microcontroller (uncalibrated). COM PORT configuration STOP GUI SCAN STEP DELAY CONTROL modification displayed in picoseconds DELAY SCAN Toggle:...
  • Page 27 CWCT & BCM-CW-E Version 2.0 User Manual COM Port configuration: • Address of the virtual COM port used by the BCM-CW-E for communication. Delay Control: • Used to set up the correct timing of the clock signal relative to the beam signal.

  • Page 28: Bcm-Cw-E Firmware

    BCM-CW-E USB port. This driver is part of the Microchip Libraries for Applications (USB package of Legacy MLA). It is also provided during delivery of the CWCT / BCM-CW-E or can be obtained from Bergoz Instrumentation upon request.
  • Page 29 CWCT & BCM-CW-E Version 2.0 User Manual mandatory that the value send to the BCM-CW-E is exactly eight characters long and contains only hexadecimal numbers. Otherwise, the BCM-CW-E might misbehave. A general frame received by the host from the BCM-CW-E looks like this:...
  • Page 30 CWCT & BCM-CW-E Version 2.0 User Manual This table describes the write commands, that can be send by the host to the BCM-CW-E. These commands change the BCM-CW-E configuration. The BCM-CW-E does not return a response: Command Description Command Comments...
  • Page 31 CWCT & BCM-CW-E Version 2.0 User Manual This table describes the read commands that can be send by the host to the BCM-CW-E and the corresponding response frames returned by the BCM-CW-E back to the host. These commands do not change the BCM-CW-E configuration:...
  • Page 32 CWCT & BCM-CW-E Version 2.0 User Manual Command Description Command Response Frame Comments Frame (omitting (omitting termination) termination) Read transfer function R0:zzzz=xxxxxxxx "xxxxxxxx" is an integer scale number in HEX format within range "00000000" "FFFFFFFF". It is the exponent of the transfer function scale.

  • Page 33: General Specifications

    CWCT & BCM-CW-E Version 2.0 User Manual GENERAL SPECIFICATIONS Beam RF 15 MHz ... 500 MHz Full scale ranges Refer to “Measured ranges” table chapter Range Control 2 TTL lines on rear panel “Remote control” DB9 or USB Control on front panel Linearity error <...
  • Page 34 CWCT & BCM-CW-E Version 2.0 User Manual Remote control “DB9,8” (Rear panel DB9): Output nominal -4V … +4V proportional to full scale current Output over range -4.1V … +4.1V Bandwidth 10kHz (-3dB) Noise +/- 2mV Output impedance 100Ω Readout impedance High impedance Max.

  • Page 35: Bcm-Cw-E Specifications

    CWCT & BCM-CW-E Version 2.0 User Manual BCM-CW-E specifications Rear module connector DIN 41612-M / 24+8 male, with 1.0/2.4 coaxial inserts Power consomption +15 V, 220 mA (Max) / -15 V, 220 mA (Max) Card size 3U x 4F, Eurosize 100 x 160 mm, 20 mm wide BCM-RFC power supply and fuses The mains voltage is factory set according to the label stuck on the front panel.

  • Page 36: Connectors And Pin Allocation

    BCM-CW-E Front panel BNC connectors RF-Chassis Rear SMA connectors DB9 female connector on BCM-RFC rear panel DIN41612M BCM-CW-E module rear connector INPUT SIGNALS BCM-CW-E Input 50 Ω (to connect to CWCT) BCM Input SMA1 INPUT CONTROLS TTL INPUT A (Gain Control)

  • Page 37: Recommendations About Cables And Installation

    BCM-CW-E system, i.e., chassis and modules should as much as possible be kept away from high power RF equipment, klystrons, cavities. If the user procures the CWCT interconnect cable from a source other than Bergoz Instrumentation, cable should be double shielded, connectors should be chosen carefully...
  • Page 38 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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Bcm-cw-e

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