ATF Cavity-BPM Analysis
NanoBPM Project
Third Mini-Workshop
on Nano Project at ATF
May 30-31, 2004
Toyoko Orimoto
LBNL & UC Berkeley
SLAC & KEK BPMs at ATF
Two BPM
experiments
at ATF
ATF BPMs
5/31/05
SLAC-BINP BPMs
ATF BPM – Toyoko Orimoto
~ 6 meters
2
Introduction
•
•
•
•
•
•
During March trip… connected ATF BPMs to SLAC
generation 1 electronics Signal smaller than expected
Short decay time
Lower freq oscillation on top of usual ~20MHz
Attempted calibration of KEK BPMs during March trip
On this trip… waveforms from the BPMs look much
better
Another attempted calibration
5/31/05
ATF BPM – Toyoko Orimoto
3
Raw Waveforms from ATF BPMs
18 March ‘05 calibration run
Trigger
x1
y1
~2 MHz
~24 MHz
Ref
SLAC x1
(for comparison)
5/31/05
x2
y2
x3
y3
ATF BPM – Toyoko Orimoto
4
Corrector Bump Calibration: Amp vs Event
X 0→-875mm Dataset
X2
X3
Amplitude
X1
event
X 0→+875mm Dataset
X2
X3
Amplitude
X1
5/31/05
ATF BPM – Toyoko Orimoto
5
event
Waveforms
BPM X1: X 0→-875mm
0 -125 -250 -375 -500 -625 -750 -875
5/31/05
0mm
-125mm
-250mm
-375mm
-500mm
-625mm
-750mm
-875mm
ATF BPM – Toyoko Orimoto
6
Amplitude: Cross-coupling (I)
Y3 Amp
Y1 Amp
Y2 Amp
X 0→-875mm Dataset
X2 Amp
X1 Amp
X3 Amp
5/31/05
X1 Amp
Y3 Amp
Y1 Amp
Y2 Amp
X 0→+875mm Dataset
ATF BPM – Toyoko Orimoto
X2 Amp
X3 Amp
7
Amplitude: Cross-coupling (I)
Y3 Amp
Y1 Amp
Y2 Amp
Y 0→-875mm Dataset
X2 Amp
X1 Amp
X3 Amp
Y3 Amp
Y2 Amp
Y1 Amp
Y 0→+875mm Dataset
5/31/05
X1 Amp
ATF BPM – Toyoko Orimoto
X2 Amp
X3 Amp
8
Waveforms from May
24 May ‘05 run
Ref
5/31/05
X2
Y1
Y3
Y2
X3
ATF BPM – Toyoko Orimoto
9
Corrector Calibration
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•
•
Bump beam in 50mm steps using corrector magnets
Used correctors upstream of SLAC-BINP BPMs
Quads off – from QD6X downstream
Beam orbit
vs
extraction line BPM #
5/31/05
BINP
ATF BPM – Toyoko Orimoto
ATF
10
Corrector Calibration
Amplitude
Response in BINP BPMs
is what we expected…
BINP Y1
5/31/05
BINP Y2
ATF BPM – Toyoko Orimoto
BINP Y3
11
event
Corrector Calibration
Amplitude
X -700mm →+700mm
Ref
X2:
Broken channel
X3
Amplitude
event
Y1
5/31/05
Y2
ATF BPM – Toyoko Orimoto
Y3
12
event
Corrector Calibration
Amplitude
Y -700mm →+700mm
Ref
X2:
Broken channel
X3
Amplitude
event
Y1
5/31/05
Y2
ATF BPM – Toyoko Orimoto
Y3
13
event
Conclusions
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•
•
Continue studying these BPMs
Three shifts this week
• Repair X2 broken channel ?
• Steer beam through ATF BPMs
• Perform proper calibration
What changed between March and May data?
5/31/05
ATF BPM – Toyoko Orimoto
14
Corrector Bump Calibration: Amp vs Event
Y 0→-875mm Dataset
Y2
Y3
Amplitude
Y1
event
Y 0→+875mm Dataset
Y2
Y3
Amplitude
Y1
5/31/05
ATF BPM – Toyoko Orimoto
15
event
Calibration: Amp vs Beam Offset
X 0→-875mm Dataset
BPM X2
BPM X3
Amplitude
BPM X1
X 0→+875mm Dataset
BPM X2
BPM X3
Amplitude
BPM X1
5/31/05
ATF BPM – Toyoko Orimoto
16
Calibration: Amp vs Beam Offset
Y 0→-875mm Dataset
BPM Y2
BPM Y3
Amplitude
BPM Y1
Y 0→+875mm Dataset
BPM Y2
BPM Y3
Amplitude
BPM Y1
5/31/05
ATF BPM – Toyoko Orimoto
17
Amplitude: Res & Cross-coupling (II)
X3 Amp
X1 Amp
Y2 Amp
X2 Amp
X2 Amp
Y2 Amp
X 0→-875mm Dataset
Y1 Amp
Y3 Amp
X1 Amp
5/31/05
X3 ATF
AmpBPM – Toyoko Orimoto
Y1 Amp
Y2 Amp
Y2 Amp
X2 Amp
X2 Amp
X 0→+875mm Dataset
Y3 Amp
18