Synchrotron Radiation Source R&D at BESSY II in Berlin
Synchrotron Radiation Source R&D at BESSY II in Berlin
Synchrotron Radiation Source R&D at BESSY II in Berlin
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Beam <strong>in</strong>duced LHe consumption<br />
I=0, B=0 : Q= 0.5 l/h (0.36 W)<br />
I=0, B=7T: Q= 0.71 l/h (0.51 W)<br />
LHe Consumption<br />
Large beam <strong>in</strong>duced consumption @ 100mA:<br />
Qb = 1.1 l/h (0.8 W)<br />
Current dependence: Qb � I2 20K-shield temper<strong>at</strong>ure: T = 10 K @ I = 0.<br />
T = 28 K @ I = 300 mA<br />
Potential causes:<br />
Wake fields <strong>in</strong>duced by<br />
♦ cross section steps <strong>in</strong> the l<strong>in</strong>er and rf-spr<strong>in</strong>g<br />
MAFIA estim<strong>at</strong>e for 1 mm step / 300mA: P = 3.6 W<br />
♦ pump<strong>in</strong>g slits <strong>in</strong> the l<strong>in</strong>er<br />
MAFIA estim<strong>at</strong>e for 30 slit pairs P = 12 µW<br />
Ernst Weihreter The <strong>BESSY</strong> <strong>II</strong> 7T Multipole Wiggler Workshop on SC Technology NSRRC June 5-6 2006<br />
4th N<strong>at</strong>. Congress on Particle Acceler<strong>at</strong>ors and Applic<strong>at</strong>ions / Bodrum / Turkey 30.8. – 1.9. 2010 Ernst Weihreter / HZB <strong>BESSY</strong> <strong>II</strong> 34
Change language