1. APPLICATION OF THE BEAM PROFILE MONITOR FOR VEPP-4M TUNING
CAS 2005
TRIESTE
APPLICATION OF THE BEAM PROFILE MONITOR FOR VEPP-4M TUNING
Andrey Zhuravlev
The BEAM profile monitor data: The beam kick and beam-beam effects
Beam dipole oscillations (black plot) and size Y behavior (red plot) after kick, Ie- =5.4 mA. It is the limit current for the VEPP-4M. The beam losses after a small kick and quadrupole mode instability take place.
Beam dipole oscillations (black plot) and size Y behavior (red plot) after kick, Ie- = 220 A.
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The beam dipole oscillations (black plot) and Y behavior (red plot) during the beams convergence in the interaction point. Duration of the single turn is 1220 ns. Channel constant is 0.12 mm. Ie+= 3.4 mA, Ie- = 3.0 mA.
The convergence of the beams with currents of Iе+=2.4 mA, Iе- =2.9 mA, accompanied by quadrupole instability.
Technical parameters
Budker Institute of Nuclear Physics
The Vepp-4 Facility Technical Parameters
VEPP-3 circumference
75 м
VEPP-4M circumference
366 м
VEPP-3 maximum energy
2000 МэВ
VEPP-3 Maximum current
200 мА
VEPP-4M maximum energy
6000 МэВ
VEPP-4M Maximum electron/positron currents
80 мА
VEPP-4M beam size
0,2 х 0,6 мм2
Collider luminosity
1.5*10 32
VEPP-3 period of revolution
0,25 мс
VEPP-4M period of revolution
1,22 мс
The MAPMT Technical Parameters
Size
250 x 100 x 100 mm
Interface
100М ethernet
Internal memory
~4 М (217 beam profiles at 16 points)
Discontinuity of record
1… 28 turns
Analyzable frequency range
10 Hz … 1 MHz
Single anode size
0.8  16 mm
Arrangement and principle of operation
The BEAM profile monitor data: the Beam frequencies measurement Qy Qx
frequency
Time
amplitude
Layout of the optical diagnostic system.
A visible part of the SR is reflected from the cooled
metallic mirror and leaves the VEPP-4M vacuum
Chamber through a glass window
Evolution of the betatron frequencies during scanning
The Fourie-spectrum of the betatron fluctuations sy sx
The typical MAPMT signal and the operating point for the amplitude measurement
Vertical beam size depending on betatron frequencies