Beam Position Noise from 500 keV MBO0I06 Dipole Sensor

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Presentation transcript:

Beam Position Noise from 500 keV MBO0I06 Dipole Sensor May 13, 2009

Beam Position Noise The Sensor was installed as part of the Segmented Injector PSS system in early Summer 2006 500 keV Dipole Current Sensor moves beam at frequency other than 60 Hz; about 80 Hz This is the major source of beam position noise in Injector. 60 Hz line noise sources have been reduced This noise makes measuring helicity correlated position differences far less accurate; increases the width of position differences. Same for charge asymmetry if there is scrapping in the accelerator How does it affect the physics program? 30 Hz Helicity Reversal is designed to cancel 60 Hz line noise; Sensor noise will not cancel completely 240 Hz Helicity Reversal for PREx; most sensitive Qweak at 1 kHz is also sensitive but less than 240 Hz Helicity Reversal Fine for HAPPEx III and PVDIS. Fix by March 1st , 2010

Sensor ON PSS Dipole Magnet Sensor OFF Sensor ON The PSS dipole is between 0I05 and 0I07. Sensor ON

Sensor ON PSS Dipole Magnet Sensor OFF Sensor ON

30 Hz PSS Dipole Magnet 250 Hz 1 kHz The PSS dipole is between 0I05 and 0I07. 1 kHz

30 Hz PSS Dipole Magnet 250 Hz 1 kHz The PSS dipole is between 0I05 and 0I07. 1 kHz

30 Hz

250 Hz

1 kHz

30 Hz

250 Hz

1 kHz