Transcript BPM and Toroid Update

BPMs and Toroids
Facility Advisory Committee
April 16, 2007
System overview
Status
Schedule
April 16, 2007
LCLS Facility Advisory Committee
1
S. Smith
[email protected]
Charge Monitoring
Should be commissioning 6 toroids, 2 Faraday cups
Injector charge monitor electronics installed
Only 3 of 6 toroids installed
IMS, IMBC1in commissioning
IM01 installed but
Output shorted by vacuum bolt
Replace when we can break vacuum
IM02, IM03, IMBC1out not installed
Two Faraday cups installed
FCG1 functional
FC01disabled on insertion
April 16, 2007
LCLS Facility Advisory Committee
2
S. Smith
[email protected]
Charge Monitors
S2
Channel 4 Chan Fast Digitizer
Access
Toroids 1-4
Raw
Data
Toroids 5-8
Channel
Access
trig
Analog
Charge
Values
IOC
EVR
ADC
Toroid/Cal
Cables
April 16, 2007
LCLS Facility Advisory Committee
LNA
+
-
S4
S3
MPS
Signals
S/H
Beam Pulse S
5
Int#2
to Fast Acquisition Board
for waveform capture
MPS
Signal amplitude
LMR-400 x 8
Baseline
Int#1
S1
Acromag IP330
16 channel, 16bit
8uS conv. time
EVR
3
Beam
Pulse
Int Int#2
#1
Dark
Current
t1 t2t3t4
t5
S. Smith
[email protected]
t6
Toroid Dark Current Monitor
April 16, 2007
LCLS Facility Advisory Committee
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S. Smith
[email protected]
Toroid Interior
April 16, 2007
LCLS Facility Advisory Committee
5
S. Smith
[email protected]
Results
Two toroids measure charge
Readings appear to jitter +-5%
more than we think the beam current jitters
Amp input bandwidth too high
Decrease bandwidth into first amp
Present bandwidth not useful
May be causing several percent jitter
Expect this will be resolved quickly
Early indication is that an impromptu RC filter reduces jitter
Will engineer proper mod to input network
April 16, 2007
LCLS Facility Advisory Committee
6
S. Smith
[email protected]
Next Phase
Complete Injector installation/commissioning
7 more toroids :
BC2
LTU
Undulator
Dump
BC2 / BTH west installation design in progress
April 16, 2007
LCLS Facility Advisory Committee
7
S. Smith
[email protected]
Beam Position Monitors
System overview
Status
Schedule
April 16, 2007
LCLS Facility Advisory Committee
8
S. Smith
[email protected]
Status
Built 23 BPM processors
Installed 21 BPM processors
Problems remaining
Parts for remaining two
Commissioning software
No global setup tool
April 16, 2007
LCLS Facility Advisory Committee
9
S. Smith
[email protected]
April 16, 2007
LCLS Facility Advisory Committee
10
S. Smith
[email protected]
BPM Diagnostic Panel
View/ adjust BPM
parameters
View digitizer waveform
Set attenuators
Set timing
Watch beam position pulse
to pulse
April 16, 2007
LCLS Facility Advisory Committee
11
S. Smith
[email protected]
Orbit Plot
April 16, 2007
LCLS Facility Advisory Committee
12
S. Smith
[email protected]
Gun Jitter
Beam jitter plus
BPM resolution
~10 microns
April 16, 2007
LCLS Facility Advisory Committee
13
S. Smith
[email protected]
Status (cont.)
Performance at least adequate for commissioning
Preformance not yet well studied
Just getting access to tools
Correlation plots, beam synch acquisition
April 16, 2007
LCLS Facility Advisory Committee
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S. Smith
[email protected]
Next
Characterize BPM performance
Establish resolution, offset, stability in operation
Plan for BC2, linac BPM installation
8 BPMs per sector
New environmetally-controlled racks
Revise BPM processor board
Fab, test, install linac BPM system this year
April 16, 2007
LCLS Facility Advisory Committee
15
S. Smith
[email protected]
PRD 1.1-314
Full document:
April 16, 2007
LCLS Facility Advisory Committee
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S. Smith
[email protected]
Beam Position Monitor System
Analog Frontend Version Three
Switchable Attenuators
Band
pass
Low Noise
Amplifier
Amp
Pad
Band
pass
Amp
Input
To ADC
Fc=140MHz 0dB NF=2.8dB 0dB NF=3.3dB
BW=14MHz to Gain=20dB to
Gain=15dB
(was 20 MHz) 15dB IP3=40dBm 15dB IP3=40dBm
April 16, 2007
LCLS Facility Advisory Committee
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6 dB Fc=140MHz NF=3.3dB
BW=6 MHz Gain=15dB
IP3=40dBm
S. Smith
[email protected]