mode - CERN Accelerator School
mode - CERN Accelerator School
mode - CERN Accelerator School
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meter<br />
phaase<br />
advance per<br />
Linac4 Dynamics y - 2<br />
Prescriptions:<br />
1. Keep zero current phase advance always below 90º, to avoid resonances<br />
22. KKeep llongitudinal i di l to transverse phase h advance d ratio i 05 0.5-0.8, 08 to avoid idemittance i<br />
exchange<br />
3. Keep a smooth variation of transverse and longitudinal phase advance per meter.<br />
4. Keep sufficient safety margin between beam radius and aperture<br />
220<br />
200<br />
180<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
0 10 20 30 40 50 60 70<br />
position [m]<br />
kx<br />
ky<br />
kz<br />
4.50E-07<br />
4.00E-07<br />
3.50E-07<br />
3.00E-07<br />
2.50E-07<br />
2.00E-07<br />
100% Normalised RMS transverse emittance (PI m rad)<br />
0 10 20 30 40 50 60 70 80<br />
Transverse r.m.s. emittance and phase advance along Linac4 (RFQ-DTL-CCDTL-PIMS)<br />
42<br />
x<br />
y<br />
transition<br />
transition
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