Bergoz MX-BPM Manuel utilisateur

bergoz

Instrumentation

Bergoz Instrumentation

Espace Allondon Ouest

01630 Saint Genis Pouilly, France

Tel.: +33-450.426.642

Fax: +33-450.426.643

Rev. 1.5.4

Japan:

U.S.A.:

REPIC Corporation

GMW Associates

28-3, Kita Otsuka 1-Chome

955 Industrial Road

Toshima-ku, Tokyo 170-0004 San Carlos, CA 94070

Tel.: 03 - 3918 - 5326 Tel.: (650) 802-8292

Fax: 03 - 3918 - 5712 Fax: (650) 802-8298

[email protected] [email protected]

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

Multiplexed

Beam Position Monitor

User’s Manual

Visit our web site at

http://www.bergoz.com

SUMMARY

Page

INITIAL INSPECTION

.................................................................

WARRANTY

.............................................................................

ASSISTANCE

...........................................................................

SERVICE & RETURN PROCEDURES

.............................................

YOU JUST RECEIVED A BPM POSITION MONITOR...

.......................

QUICK CHECK

.........................................................................

ON-BOARD ATTENUATORS ADJUSTMENT

......................................

Beam Position Monitor board

..................................................

BUTTON SAMPLING

....................................................................

EXTERNAL CLOCK

.....................................................................

ALGORITHM & POLARITY CONVENTION

........................................

PRINCIPLE OF OPERATION

...........................................................

BLOCK DIAGRAM

.......................................................................

PERFORMANCE

..........................................................................

Sampling frequency

.............................................................

Noise (resolution)

................................................................

Position (linearity) error

.........................................................

Drift

................................................................................

CLOSE ORBIT OPERATING MODE

..................................................

FIRST TURN CAPABILITY

............................................................

Single Button Sampling (SBS) option

........................................

SINGLE BUNCH / SINGLE BEAM OPERATION

..................................

Fast NIM Gate (FG) option

....................................................

X AND Y GAIN ADJUSTMENT

.......................................................

LOCAL OSCILLATOR PROGRAMMING

............................................

SIGNALS

...................................................................................

CABLES LAYOUT, INSTALLATION

.................................................

OPERATING CONSIDERATIONS

.....................................................

Aliasing of AM and FM modulations

..........................................

Identifying and eliminating aliasing

............................................

CONNECTORS PINS ALLOCATION

.................................................

ACCESSORIES

............................................................................

Table-top test kit

.................................................................

Card extender

.....................................................................

Service modules, TTL commands, RF

........................................

Chassis

............................................................................

SPECIFICATIONS

........................................................................

BPM MODULE REAR CONNECTOR

.................................................

SCHEMATICS & BOARD LAYOUT

...................................................

ACKNOWLEDGEMENT

.................................................................

Annex I.

RF Connectors from Siemens

Annex II.

Precision Analog Signal Processing for Beam Position Measurements in Electron

Storage Rings, J.A. Hinkson and K.B. Unser, Proceedings of the 2nd DIPAC,

Travemünde 1995

Annex III.

New Generation Electronics Applied to Beam Position Monitors, Klaus B. Unser

1996 Beam Instrumentation Workshop, Argonne National Laboratory.

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 1 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

INITIAL INSPECTION

It is recommended that the shipment be inspected immediately upon delivery. If it is damaged in any

way, contact Bergoz Instrumentation or your local distributor. The content of the shipment should be

compared to the items listed on the invoice. Any discrepancy should be notified to Bergoz

Instrumentation or its local distributor immediately. Unless promptly notified, Bergoz

Instrumentation will not be responsible for such discrepancies.

WARRANTY

Bergoz Instrumentation warrants its beam monitors to operate within specifications under normal use

for a period of 12 months from the date of shipment. Spares, repairs and replacement parts are

warranted for 90 days. Products not manufactured by Bergoz Instrumentation are covered solely by

the warranty of the original manufacturer. In exercising this warranty, Bergoz Instrumentation will

repair, or at its option, replace any product returned to Bergoz Instrumentation or its local distributor

within the warranty period, provided that the warrantor's examination discloses that the product is

defective due to workmanship or materials and that the defect has not been caused by misuse, neglect,

accident or abnormal conditions or operations. Damages caused by ionizing radiations are specifically

excluded from the warranty. Bergoz Instrumentation and its local distributors shall not be responsible

for any consequential, incidental or special damages.

ASSISTANCE

Assistance in installation, use or calibration of Bergoz Instrumentation beam monitors is available

from Bergoz Instrumentation, 01630 Saint Genis Pouilly, France. It is recommended to send a

detailed description of the problem by fax.

SERVICE PROCEDURE

Products requiring maintenance should be returned to Bergoz Instrumentation or its local distributor.

Bergoz Instrumentation will repair or replace any product under warranty at no charge. The purchaser

is only responsible for transportation charges.

For products in need of repair after the warranty period, the customer must provide a purchase order

before repairs can be initiated. Bergoz Instrumentation can issue fixed price quotations for most

repairs. However, depending on the damage, it may be necessary to return the equipment to Bergoz

Instrumentation to assess the cost of repair.

RETURN PROCEDURE

All products returned for repair should include a detailed description of the defect or failure, name and

fax number of the user. Contact Bergoz Instrumentation or your local distributor to determine where

to return the product. Returns must be notified by fax prior to shipment.

Return should be made prepaid. Bergoz Instrumentation will not accept freight-collect shipment.

Shipment should be made via Federal Express or United Parcel Service. Within Europe, the

transportation service offered by the Post Offices "EMS" (Chronopost, Datapost, etc.) can be used.

The delivery charges or customs clearance charges arising from the use of other carriers will be

charged to the customer.

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 2 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

YOU JUST RECEIVED A BEAM POSITION MONITOR ....

The BPM system includes:

Description

Order code

•

BPM electronics module

BPM-XXX.XXMHz....

• 19” chassis with power supply BPM-RFC/X, X = BPM stations number

•

Table-top test kit with power supply

BPM-KIT

•

3U-Card extender with coaxial contacts

BPM-XTD

•

RF service module with four front-panel SMA

BPM-SERV/RF

•

TTL commands service module

BPM-SERV/CMD

with front-panel DB9 and DB15 connectors

This delivery may include:

•

Option: Single button sampling

BPM-SBS

•

Option: Fast NIM gate

BPM-FG

If included, these options are mounted on the BPM electronics module.

Check that the voltage of the power supply corresponds to your mains voltage.

On the table-top kit: The voltage is indicated on the power supply module.

If it does not correspond, use a transformer or contact the manufacturer to get another power supply.

In the 19” chassis: The power supply is autoranging (98V…264V), and does not need any

adjustment.

QUICK CHECK

You can check immediately that your BPM system is working.

If you have the table-top test kit (BPM-KIT), use the following set-up:

Oscilloscope

Ch.1 Ext. trig.

SDEMOD SYNC

Beam

Position

Monitor

RF Source

AC mains

Power

splitter

8-bit DIP switch

agc

clock

DVM DVM

Power

supply

Place all DIP switches to the left: OFF

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 3 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

QUICK CHECK (Cont'd)

If you have a 19” chassis (BPM-RFC/X), use the following set-up:

DVM DVM

RF Source

Power

splitter

Oscilloscope

Ch.1 Ext. trig.

To button inputs

(back of chassis)

Attach the equipment together as shown above.

Set the oscilloscope time base on 0.2 ms / div.

Ext. trigger connects to SYNC signal, trigger level 0.2V, 1 M

Ω

AC coupling

Channel 1 to SDEMOD signal, sensitivity 0.1 V / div., 1 M

Ω

AC coupling

Set the RF source to the operating frequency.

Amplitude ca. -13 dBm

Note:

The BPM module operating frequency is written on the F–Key daughter board.

To access the F–Key, remove the BPM module shield.

Set the X and Y voltmeters range in such a way that millivolts are readable.

Connect to AC mains, the oscilloscope should display:

Synchronous demodulated signal.

Each period 100…125µs represents

the successive buttons A, B, C, D, A, B…

The signals are equalized before delivery

of the BPM module, using a precision

input 4-way splitter.

Differences in signal level as shown here

are due to uneven input signals.

Note: 1 dB input signal difference gives

ca. 300 mV of demodulated signal

amplitude difference

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 4 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

QUICK CHECK (Cont'd)

It may be that the demodulated button signals are uneven, like this:

Synchronous demodulated signal.

Each period 100…125µs represents

the successive buttons A, B, C, D, A, B…

This demodulated signal indicates large

difference of power applied to the button

inputs.

Differences in signal level as shown here

exceed 1 dB.

The on-board button attenuators could be adjusted to compensate for the input power difference,

therefore equalize the signals, but...

Do not readjust the on-board attenuators before you are familiar with the BPM behaviour.

What if the display does not look as shown

Check that all DIP switches of the table-top test kit are set OFF (left position).

Check that all cables are properly connected.

Check that the RF source gives the required frequency and amplitude.

If you have more than one BPM module, try another one.

Getting familiar with the BPM

Vary the power from the RF source to simulate beam intensity variations.

Explore the range from 0 dBm down to -90 dBm.

Remember that the 4-way power splitter absorbs some power: adjust for it !

While the RF source output power is changed, observe the intensity dependence of X and Y

outputs on the voltmeters. If the BPM electronics gain has been set for 1 V/mm, each mV is

equivalent to 1 µm beam displacement.

Measure the rms noise at various signal levels.

Observe the noise spectrum with an FFT or baseband spectrum analyser, at various signal levels.

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 5 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

ON-BOARD ATTENUATORS ADJUSTMENT

Introduction

The BPM module is equipped with four on-board adjustable attenuators. Each attenuator

adjustment range exceeds 1 dB. We recommend that all BPM modules are adjusted on center for

equal power applied to the four button inputs. The on-center condition is satisfied when the

amplitude variation of SDEMOD is below 20mV at –10 dBm input power. Then, X

≈0 and Y≈0.

The remaining X and Y zero offsets can be eliminated (within ±20mV) by fine tuning the

attenuators.

The BPM electronics has best performance, i.e. more linearity over the dynamic range, when the

power difference between input signals is kept to a minimum. This is obtained for a centered beam

and cables with equal attenuation.

The on-board attenuators can be used –within their limited 1-dB range– to compensate for an off-

centered beam or unequal cable attenuations.

Procedure

The table-top test kit (BPM-KIT) is the easiest setup to adjust the attenuators.

Extract the BPM module and proceed as described in “Quick Check”.

Note: BPM modules can be removed and inserted while the power is on.

The card extender (BPM-XTD) allows a BPM module to be extended out of its chassis slot.

Extract the BPM module, install the extender and proceed as in “Quick Check”.

Note: The card extender has unequal button-to-button attenuations. It introduces an offset in

X and Y. The card extender offset was measured at the time of shipment. To recheck it, measure

the X and Y offsets with and without extender.

To adjust the on-board attenuators, we recommend that the shield is removed:

To remove shield: Remove screws (2) from under

On-board attenuators access

holes

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 6 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

ON-BOARD ATTENUATORS ADJUSTMENT (Cont’d)

Beam Position Monitor board

BUTA

BUTB

BUTC

BUTD

IF BPF

Level shift

AGC

IF BPF

RF BPF

Attenuators

Clock

adjust

Y gain

Σadj.

X gain

Lock

Carrier phase

F-Key

Demod. phase

Demodulator

SBS-mode

fixed

level gain

GaAs

switch

driver

GATE

(option)

Single

Button

Sampling

(option)

Mixer

LNA

To adjust the attenuators, use a screwdriver with a ceramic tip. A metal tip changes the signal !

Set all four on-board adjustable attenuators 1/4 of a turn clockwise. One turn is ca. 3

π/2.

Set the RF source to the BPM operating frequency. Set power level such that -10 dBm is applied to

each button, taking the 4-way power splitter attenuation into account.

Adjust progressively A, B, C and D attenuators until the SDEMOD signal has minimum level

differences.

Note: The BPM module adjustment

must

be done by observing SDEMOD to minimize the button-

to-button power differences. It can not be done by simply adjusting X=0 and Y=0 : There is an

infinite number of A,B,C,D combinations satisfying X=0 and Y=0; i.e. A=1, B=2, C=1, D=2

yields X=A-B-C+D=0 and Y=A+B-C-D=0.

BUTTON SAMPLING

The BPM module has an on-board clock to drive the input multiplexer. The internal clock

frequency is adjustable by the “Clock adjust” potentiometer from 8 to 10 kHz.

Each button is thus sampled during 100 to 125 µs, and a complete scan is made in 400 to 500 µs.

The beginning of each scanning cycle is available as output signal SYNC rising edge (See

“Connector Pins Allocation”, this manual). SYNC frequency is 1/4 of sampling frequency.

The internal clock can be overridden by an external clock.

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 7 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

EXTERNAL CLOCK

An external clock can be applied to the BPM module to drive the input multiplexer.

It must be applied to CLK* (See “Connector Pins Allocation”, this manual).

Amplitude

≥6Vp-p, or ≥

3 V positive-going, pulse length

≥

10µs.

It overrides the internal clock after a few milliseconds.

The BPM module operates properly up to an external frequency of 40 kHz, therefore the sampling

of each button input can be made in 25µs, the four buttons can be sampled in 100µs. As a result,

the beam position can be effectively sampled up to a frequency of 10 kHz.

The use of an external clock –and faster beam position sampling– may be required to eliminate

aliasing of certain beam motions.

The performance of the BPM module is not affected by a higher sampling frequency:

• The X/Y output noise increase is not noticeable

• The X/Y zero (on-center) dc values are slightly shifted, but stable at each particular frequency.

ALGORITHM &

POLARITY CONVENTION

45° buttons

VA+ VB+ VC +VD

VA+ VB- VC - VD

X=VA- VB- VC + VD

VA+ VB+ VC +VD

C D

Orthogonal buttons

KyY =VA+ VB+ VC +VD

VB- VD

X=VA- VC

VA+ VB+ VC +VD

BERGOZ Instrumentation

Multiplexed

01630 Saint Genis Pouilly, France

Beam Position Monitor

Tel. +33-450.426.642

Fax +33-450.426.643

Page 8 User’s manual

BERGOZ Instrumentation - 01630 Saint Genis Pouilly, France - Tel.: +33-450.426.642 - Fax: +33-450.426.643

email: [email protected] - http://www.bergoz.com - Registre des Métiers: Bourg-en-Bresse - Registre des ingénieurs: Zurich

TVA-VAT-IVA-USt. Nº FR88414997130 - Sàrl. capital 152K



- Siren 414 997 130 R.C.S. Bourg - APE 332B

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