Diagnostics Systems

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Diagnostics Systems
Fernando Sannibale W. Barry, W. Byrne, M. Chin,
R. Duarte, H. Nishimura, J. Oneill
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Contents
ALS Topoff Upgrade 1st Project Review November
23, 2004

• General Considerations Strategy
• Booster Diagnostics
• Transverse Tune Measurement System
• Orbit Monitoring System
• Transferline Diagnostics
• Synchrotron Radiation Monitors
• Beam Stopper for Injection Tune-Up
• Injection chain beam transmission monitor
• Storage Ring Diagnostics
• Bunch by Bunch Current Monitor
• Bunch Purity Monitor (next talk)

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General Considerations Strategy
ALS Topoff Upgrade 1st Project Review November
23, 2004
Beam diagnostics in the Booster will play a major
role during the commissioning and operation of
the Booster in the top-off mode. Injection
efficiency together with short and long term
stability of the booster operation conditions are
now fundamental requirements. At the present
time, the booster is operated with sextupoles off
and without any orbit control. Long-term drifts
are compensated by readjustments by the
operators. In top-off operation, tolerances for
the injection parameter fluctuations are much
tighter requiring more efficient diagnostics
systems. Some examples, synchro-betatron
resonance control is required during the energy
ramping, closed orbit and current monitoring are
necessary for preserving the injection
efficiency, bunch cleaning requires accurate
control of tunes, chromaticities and orbit.
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What We Have and What We Add
ALS Topoff Upgrade 1st Project Review November
23, 2004
What we have and do not change Most of storage
ring beam diagnostics Beam profile monitors in
the transferlines
What we refurbish/upgrade Booster orbit
system Injector current monitors Storage ring
bunch by bunch measurement Storage ring bunch
cleaning system
What we add Booster betatron tune measurement
system Booster bunch cleaning system BTS
transferline beam stopper for injector
tune-up BTS synchrotron radiation
monitors Storage ring bunch purity monitor
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Booster Transverse TuneMeasurement System
ALS Topoff Upgrade 1st Project Review November
23, 2004
The Booster tune measurement system will utilize
the bunch-cleaning kicker and power amplifiers
for exciting the beam at chosen vertical betatron
tune frequencies. For horizontal coverage an
additional horizontal kicker is required and an
additional power amplifier needs to be purchased.
The preferred azimuthal position of the
horizontal kicker in the ring should be as close
as possible to the last focusing quadrupole
before the cell symmetry point, where the
horizontal beta function assumes a local
maximum. The Tune measurement itself will be
performed with a fast broadband oscilloscope
utilizing FFT to obtain frequency spectrums.
ALS SR Horizontal Kicker
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Booster Orbit Monitor System
ALS Topoff Upgrade 1st Project Review November
23, 2004
The Booster ring has 32 beam position monitors
distributed along the circumference. They are
equipped with the original ALS electronics that
allows for both single and multi turn
measurements. The all orbit system has been
rarely used for several years and requires
significant refurbishing.

• Two phases with different requirements
• commissioning, single turn or few turns
  measurements. Larger betatron tunes 6, 13-14
  BPMs equipped with single turn electronics
• ii) topoff operation, orbit monitoring for
  efficient injection and bunch cleaning, . About
  13-14 BPMs with multi-turn electronics.

We propose refurbishing the existing electronics
for the single turn and to new electronics for a
reliable orbit monitoring during operation. A
high level application, similar to the one for
the ALS storage ring, should be developed for an
easy monitoring of the orbit in the booster.
Booster Tunes 5.82 Hor., 2.72 Vert.
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BTS Synchrotron Radiation Monitors
ALS Topoff Upgrade 1st Project Review November
23, 2004
Source at B1 high dispersion Source at B3
zero dispersion Single glance check of the
injector status Both uses standard CCDs
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SRM _at_ B1 BTS Bending Magnet
ALS Topoff Upgrade 1st Project Review November
23, 2004
Requires replacement of the flag with a
mirror. Nothing more!
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SRM _at_ B3 BTS Bending Magnet
ALS Topoff Upgrade 1st Project Review November
23, 2004
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BTS Beam Stopper forInjection Tune-up
ALS Topoff Upgrade 1st Project Review November
23, 2004
10 radiation length Tungsten Heavy duty
Beam Stopper
Allows injector tune up protecting SR septa for
radiation damage and avoid stray electron beams
in the Storage Ring
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Injector Chain BeamTransmission Monitor
ALS Topoff Upgrade 1st Project Review November
23, 2004
Single window with all monitors (but FCT1)
together
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Storage RingBunch by Bunch Current Monitor
ALS Topoff Upgrade 1st Project Review November
23, 2004

• Upgrade of the existing system
• Use of a cleaner signal from an ID BPM
• Dedicated oscilloscope
• Development of a new high level application