s. smith lcls facility advisory [email protected] april 16, 2007 1 bpms and toroids...
Post on 19-Dec-2015
215 views
TRANSCRIPT
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 1
BPMs and ToroidsFacility Advisory Committee
April 16, 2007
System overviewStatusSchedule
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 2
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
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 3
Charge Monitors
4 Chan Fast Digitizer
Toroids 5-8
Toroids 1-4
Toroid/CalCables
ChannelAccess
trig AnalogChargeValues
ChannelAccess
IOC
AD
CE
VR
MPS
MPSSignals
Acromag IP33016 channel, 16-bit8uS conv. time
RawData
LMR-400 x 8LNA +
-
BaselineInt#1
S1
S3
S4
Beam PulseInt#2
S/H
S5
to Fast Acquisition Boardfor waveform capture
S2
EVR t1 t2 t5 t6t4t3
Int#1
Int#2
Sig
na
l a
mp
litu
de
DarkCurren
t
Beam
Pulse
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 4
Toroid Dark Current Monitor
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 6
ResultsTwo 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
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 7
Next PhaseComplete Injector installation/commissioning
7 more toroids :
BC2
LTU
Undulator
Dump
BC2 / BTH west installation design in progress
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 8
Beam Position MonitorsSystem overview
Status
Schedule
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 9
StatusBuilt 23 BPM processors
Installed 21 BPM processors
Problems remaining
Parts for remaining two
Commissioning software
No global setup tool
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 11
BPM Diagnostic PanelView/ adjust BPM parameters
View digitizer waveformSet attenuators
Set timing
Watch beam position pulse to pulse
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 13
Gun Jitter
Beam jitter plus BPM resolution ~10 microns
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 14
Status (cont.)
Performance at least adequate for commissioning
Preformance not yet well studied
Just getting access to tools
Correlation plots, beam synch acquisition
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 15
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
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 16
Full document:
PRD 1.1-314
S. Smith
LCLS Facility Advisory Committee [email protected]
April 16, 2007 17
Beam Position Monitor System
Input
Low Noise Amplifier
AmpBandpass Amp
To ADC
Bandpass
NF=2.8dBGain=20dBIP3=40dBm
Fc=140MHzBW=14MHz(was 20 MHz)
Fc=140MHzBW=6 MHz
NF=3.3dBGain=15dBIP3=40dBm
NF=3.3dBGain=15dBIP3=40dBm
Switchable Attenuators
0dBto
15dB
0dBto
15dB
6 dB
Pad
Analog Frontend Version Three