Bob Lill Undulator Systems – BPM [email protected] January 31, 2006 Undulator Cavity BPM Design and Status

Bob Lill

Undulator Systems – BPM Diagnostics [email protected]

January 31, 2006

Undulator Cavity BPM Design and Status

Bob Lill


January 31, 2006

X-Band Cavity BPM Overview

Cavity BPM system design

Current status for prototype testing

Planning for first article and production

Bob Lill


January 31, 2006

LTU and Undulator BPM System Specification

Parameter Specification Limit

Condition

Resolution < 1m 0.2 – 1.0 nC

+/- 1 mm range

Offset Stability < +/- 1m 1 hour

+/- 1 mm range

20.0 +/- 0.56 Celsius

Offset Stability < +/- 3m 24 hours +/- 1 mm range

20.0 +/- 0.56 Celsius

Gain Error < +/- 10 % +/- 1 mm range

20.0 +/- 0.56 Celsius

Dynamic Range, Position +/- 1 mm 10 mm diameter vacuum chamber

Dynamic Range, Intensity > 14 dB PC Gun

0.2 – 1.0 nC

Bob Lill


January 31, 2006

In-Tunnel Electronics Block Diagram

Attenuator/bandpassfilter

X-Band Cavity BPM

Dx

Dy

SUM

Attenuator/bandpass

filter

Magic Tee

Attenuator/bandpass

filter

Magic Tee

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

LO Ampl

Beam Synchronized local oscillator

IN-TUNNEL ELECTRONICS

Bob Lill


January 31, 2006

X-Band Cavity BPM Design

SLAC selective coupling design utilized to reduce monopole mode

Solid Copper Body

WR-75 waveguide output

Waveguide transition brazed to body

Bob Lill


January 31, 2006

Prototype Cavity BPM Specification


Condition

TM110 Frequency

Dipole Cavity

11.364 GHz 20.0 +/- 0.56 Celsius

Loaded Q factor

Dipole Cavity

3000

+/- 200

20.0 +/- 0.56 Celsius

Power Output TM110

Dipole Cavity

-10 dBm 20.0 +/- 0.56 Celsius

1nC, 1mm offset, 200fs BL

X/Y Cross Talk

Dipole Cavity

< -20 dB +/- 1 mm range

20.0 +/- 0.56 Celsius

TM011 Frequency

Monopole Cavity

11.364 GHz 20.0 +/- 0.56 Celsius

Loaded Q factor

Monopole Cavity

3000

+/- 200

20.0 +/- 0.56 Celsius

Power Output TM011

Monopole Cavity

-10 dBm 20.0 +/- 0.56 Celsius

1nC, +/-1mm offset range, 200fs BL

Bob Lill


January 31, 2006

Dipole Cavity Design

Beam pipe radius = 5 mm

Cavity radius = 14.937 mm

Cavity gap = 3 mm

Distance beam axis to bottom of wg = 9.5 mm

Waveguide= 19.05 x 3 mm

Bob Lill


January 31, 2006

Monopole Cavity Design

Beam pipe radius = 5 mm

Cavity radius = 11.738 mm

Cavity gap = 2 mm

Coupling Slot = 4 x 2 mm

Shortest distance from cavity opening to bottom of waveguide=1.734 mm

Waveguide= 19.05 x 3 mm

Bob Lill


January 31, 2006

Cold Test Prototype

Non-vacuum cold test prototype

Removable end caps

Accelerates test fixture development and cold test procedures

Bob Lill


January 31, 2006

Vacuum Window Prototype Cold Test

Utilized standard CPI WR-75 windowSilver plated Kovar/Glass vacuum sealWindow cost $100 vs. $ 218 for Kaman coax feed thruInsertion Loss < 0.2 dBReturn loss -20dB

Bob Lill


January 31, 2006

Waveguide Transitions Prototype Cold Test

Transitions E plane from 3 mm to 9.53 mm (standard WR-75)

Waveguide transition brazed to body

Insertion Loss < 0.2 dB

Return loss -20dB

Bob Lill


January 31, 2006

Before Soldering Transitions and Windows

Bob Lill


January 31, 2006

X-Band Cavity BPM Cold Test

Waveguide and windows soldered together

Unit is vacuum tight except for removable end caps

First data looks encouraging

Dipole Cavity Horizontal Scan

-80.0

-70.0

-60.0

-50.0

-40.0

-30.0

-20.0

-10.0

0.0

-1000 -800 -600 -400 -200 0 200 400 600 800 1000

Position (Microns)

Ou

tpu

t (d

B)

Bob Lill


January 31, 2006

Monopole and Dipole Wideband Sweep

Bob Lill


January 31, 2006

Dipole Cavity Design

Electrical Parameters

Predicted Measured

Frequency 11.364 GHz 11.345 GHz

Voltage Output 2.77 mV/nC/µm TBD

Q loaded 2838 400

Beta coupling 0.334 TBD

X/Y coupling -20 dB -35 dB

Temperature Drift 168 KHz/C TBD

Bob Lill


January 31, 2006

Monopole Cavity Design

Electrical Parameters

Predicted Measured

Frequency 11.364 GHz 11.427 GHz

Voltage Output 6.2 V/nC TBD

Q loaded 2645 444

Beta coupling 0.096 TBD

R/Q normalized shunt impedance

36.5 ohms TBD

Bob Lill


January 31, 2006

Surface Finish Test

End caps and cavity finish received 32 finish (1 um)

Polishing Monopole cavity end cap to approx 0.1 um

Q improved from 444 to 682

Bob Lill


January 31, 2006

In-Tunnel Receiver Block Diagram

Dx

Dy

SUM

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

LO Ampl

Beam Synchronized local oscillator

Bob Lill


January 31, 2006

Prototype Receiver Specification


Condition

RF Frequency 11.364 GHz 20.0 +/- 0.56 Celsius

Dx, Dy, Intensity

Input Peak Power 50 watts peak No damage (limiter protection)

LO Frequency 11.424 GHz

(2856 MHz*4)

20.0 +/- 0.56 Celsius

1nC, 1mm offset, 200fs BL

LO Power Range +10 dBm Max. Provide LO for 3 down converters

IF Frequency 60 MHz Min. 20.0 +/- 0.56 Celsius

Noise Figure Dx and DY 2.7 dB Max. 20.0 +/- 0.56 Celsius

Noise Figure Intensity (reference) 4.0 dB Max. 20.0 +/- 0.56 Celsius

LO to RF Isolation 40 dB Min. 20.0 +/- 0.56 Celsius

LO to IF Isolation 45 dB Min. 20.0 +/- 0.56 Celsius

Output Power +14 dBm 1 dB compression

Conversion Gain 25 dB typical 20.0 +/- 0.56 Celsius

Bob Lill


January 31, 2006

Miteq X-Band Low Noise Receiver

Existing product line

WR 75 Waveguide Interface

Low Noise Figure (2.7 dB)

Budgetary price for (3 channels) $6500.00

Bob Lill


January 31, 2006

Prototype X-Band Low Noise Receivers

Conversion gain 27.5 dB

Over 60 dB dynamic range

Noise Figure 2.5 dB

IF bandwidth 40-80 MHZ

Ready for ITS Installation

Bob Lill


January 31, 2006

Prototype Receiver Data

0

50

100

1stQtr

3rdQtr

East

West

North

Power Sweep LO 8 dBm RF 11.364 GHz

-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

30

-100 -80 -60 -40 -20 0

X-Band Power (dBm)

DC

Ou

tpu

t 60 M

Hz (

dB

m)

s/n 118994

27.5 dB

diff

Bob Lill


January 31, 2006

BPM System Test Approach

Phase I

Injector Test Stand ITSInstall single X-Band Cavity and modified off-the-shelf down converter receiver

Mount BPM on Piezo two-axis translation stage

Phase II

Bypass line or LEUTL test with PC gun

Install three X-Band Cavities BPMs

Bypass line test with PC gun to start June 06

Bob Lill


January 31, 2006

Injector Test Stand ITS Beam Parameters

Charge- 1 nC single-bunch

Bunch length- ~ 3 - 4 ps FWHM for ps laser

Spot size on final screen at 5.5 MeV ~ 0.75 mm rms, ps laser

Bob Lill


January 31, 2006

Phase I Data Acquisition Design Approach

Instrument three channel down converters with Struck SIS-3301-105 ADCs 14-bit

Single VME board will provide the data acquisition for 8 channels

Epics driver complete

Digitize horizontal, vertical position and Intensity 0 to 1 volt range

Fit Data to decaying exponential at 50 MHz

Bob Lill


January 31, 2006

Phase I Testing Objectives

Test prototype Cavity BPM, down converter, and data acquisition

Generate preliminary compliance table to specification

Gain operational experience to determine if translation stage is useful, what are optimum operating parameters

Bob Lill


January 31, 2006

Phase I Schedule Milestones

Design and develop prototype Cavity BPM Prototype non vacuum

Jan 06

Build single Cavity BPMFeb 06

Cold TestFeb 06

Install cavity BPM into ITS and TestFeb 06

Bob Lill


January 31, 2006

Phase II Schedule Milestones

Refine design and develop First Article Cavity BPM and support hardware

March 06

Build 3 Cavity BPMsMarch 06

Cold TestMay 06

Install 3 cavity BPMs into APS PAR/Booster bypass line or LEUTL and Test

June 06

Bob Lill


January 31, 2006

Phase II Testing Objectives

First Article Prototypes evaluatedTest three BPM separated by fixed distance

to determine single-shot Complete test matrix

Bob Lill


January 31, 2006

LTU and Undulator Planning

Receiver and LO housed in shielded enclosure below girder 20 watt power dissipation maximum

Presently BPM output on wall side

BPM output flexible waveguide section allows movement for alignment

Bob Lill


January 31, 2006

BPM Mounting

BPM connects directly to the girder.

Mechanical adjustment stage used for alignment

BPM and Quad can be adjusted into position independent of one another

Bob Lill


January 31, 2006

Undulator Planning

Bob Lill


January 31, 2006

Production Phase

Production of 2 BPMs for LTU 04/07Production of 6 BPMs for undulator 04/07Production of 8 BPMs for undulator 06/07Production of 3 BPMs for LTU 06/07Production of 8 BPMs for undulator 08/07Production of 3 BPMs for LTU 08/07Production of 11 BPMs for undulator 10/07Spares 12/07

Bob Lill


January 31, 2006

Summary

X-Band Cavity BPM development ongoingBrass body prototype (non-vacuum)

ITS prototype (vacuum)

Receiver Prototype ready for ITS installationParts are assembled and tested

Waveguide components received

Data AcquisitionSLAC providing constructive communications and collaboration

Documents

Bob Lill Undulator Systems – BPM [email protected] January 31, 2006 Undulator Cavity BPM Design and Status