Bob Lill Undulator Systems – BPM [email protected] April 20, 2006 Undulator Cavity BPM Status and Plans

Bob Lill

Undulator Systems – BPM Diagnostics [email protected]

April 20, 2006

Undulator Cavity BPM Status and Plans

Bob Lill


April 20, 2006

X-Band Cavity BPM Development

Removable end cap prototype built and tested

Cold test fixtures and measurement procedures generated

ITS prototype unit received and presently being cold tested

Bob Lill


April 20, 2006

Vacuum Window Prototype

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


April 20, 2006

Prototypes Bolted end caps Brazed end caps

Bob Lill


April 20, 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


April 20, 2006

Monopole and Dipole Wideband Sweep Bolted End Caps

Monopole Cavity Dipole Cavity antenna offset 2 mm

Bob Lill


April 20, 2006

Dipole Wideband Sweep Brazed End Caps

Antenna Centered (null) Antenna Offset 0.5 mm

Bob Lill


April 20, 2006

Dipole Cavity Data Parameter

(500 micron offset)

Predicted Value Measured prototype # 1

Bolted end caps

Measured prototype # 2

Brazed end capsFrequency (TM010) 8.262 GHz 8.271 GHz 8.243 GHz

Coupling (TM010) -53 dB -69 dB -62 dB

Frequency (TM110) 11.364 GHz 11.344 GHz 11.357 GHz


Q (loaded) (TM110) 2704 2086 2391

Isolation X/Y (TM110) -26 dB -33 dB -23 dB

Isolation monopole to dipole cavity

< -80 dB < -85 dB < -89 dB

Frequency (TM020) 15.825 GHz 15.767 GHz 15.785 GHz


Bob Lill


April 20, 2006

2.54 micron step movements of antenna

Antenna Scan IF45 MHz Pin 14 dBm CW

0

10

20

30

40

50

60

70

-60 -40 -20 0 20 40 60

Position (microns)

Ou

tpu

t (m

V)

Bob Lill


April 20, 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


April 20, 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


April 20, 2006

Prototype Receiver Specification

Parameter Specification Limit

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


April 20, 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


April 20, 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


April 20, 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


April 20, 2006

Lab Data Acquisition Development

Cavity BPM and electronics tested using an impulse generator

Optimization algorithm used to find best fit

Comparing fits from 5 GHz sampling scope

100 MHz sampling

5 GHz sampling scope

Bob Lill


April 20, 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

Bob Lill


April 20, 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


April 20, 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


April 20, 2006

Phase I Schedule Milestones

Design and develop prototype Cavity BPM Prototype non vacuum Cavity BPM complete

Build single Cavity BPMDelivered April 17, 2006

Cold Test and install cavity BPM into ITSApril 06

ITS TestingMay 06

Bob Lill


April 20, 2006

Phase II Schedule Milestones

Refine design and develop First Article Cavity BPM and support hardware

June 06

Build 3 Cavity BPMsAugust 06

Cold TestSeptember 06

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

October 06

Bob Lill


April 20, 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


April 20, 2006

Design Enhancements for Manufacturing

Tuning Pins to tweak frequency and isolation

Strengthen end caps to reduce mechanical deflection

Increase braze surface on end cap to body interface

Bob Lill


April 20, 2006

Production Phase

Production of 2 BPMs for LTU 04/07Production of 4 BPMs for undulator 04/07Production of 10 BPMs for undulator 06/07Production of 10 BPMs for undulator 08/07Production of 10 BPMs for undulator 10/07Spares 12/07

Bob Lill


April 20, 2006

Summary

X-Band Cavity BPM development ongoingBolt-together prototype (non-vacuum) complete

ITS prototype (vacuum) preparing for ITS test

Receiver Prototype ready for ITS installationParts are assembled and tested

Waveguide components received

Data Acquisition and TestSLAC providing constructive communications and collaboration

Documents

Bob Lill Undulator Systems – BPM [email protected] April 20, 2006 Undulator Cavity BPM Status and Plans