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LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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Magnet<br />

String<br />

Location<br />

Existing,<br />

New or<br />

Recycled<br />

L C L S C O N C E P T U A L D E S I G N R E P O R T<br />

No. of<br />

Power<br />

Supplies<br />

Magnets<br />

per<br />

Supply<br />

Uni-<br />

or Bipolar<br />

Magnet<br />

Type<br />

Max.<br />

Current<br />

[A]<br />

Max.<br />

Voltage<br />

[V]<br />

Est. Reg.<br />

Tolerance<br />

[%]<br />

DL1 N 1 2 U 5D7.1 450 10 0.02<br />

BC1 N 1 4 U 5D7.1 400 20 0.02<br />

BC2 N 1 4 U 1D15.7 ~1000 ? 0.05<br />

DL2 N 1 4 U 4D102.36T 375 40 0.02<br />

DL2 N 1 2 U VB ? ? 0.05<br />

DL1/BC1 N 12 1 B 1Q5.6 12 36 0.1<br />

L1/BC1 N 4 1 B QA 8 5 0.1<br />

L2/L3 E 69 1 U QE 20 ? 0.1<br />

BC1 N 3 1 U QE 25 2 0.1<br />

L2/L3 N 6 8 U QE 25 ? 0.1<br />

L2 N 1 5 U QE 25 ? 0.1<br />

BC2 N 4 1 U QE 200 20 0.1<br />

BC2 N 2 1 B QE 12 1 0.1<br />

BSY E 1 3 U 50Q1,2,3 310 ? 0.1<br />

BSY E 1 1 U QSM 9.8 ? 0.1<br />

DL2 E 3 1 U 0.91Q17.7 240 ? 0.05<br />

DL2 R 2 4 U 0.91Q17.7 250 120 0.05<br />

DL2 R 2 2 U 0.91Q17.7 250 60 0.05<br />

DL2 R 9 1 U 0.91Q17.7 250 30 0.05<br />

DL2 R 1 6 U 0.91Q17.7 100 80 0.05<br />

A list of <strong>LCLS</strong> profile monitors is given in Table 7.27. This list does not include monitors<br />

placed upstream of the end of the L0-linac. The profile monitors are wire-scanners, OTR<br />

monitors (or both in a few cases), or phosphor screens. Wire-scanners allow non-invasive, but<br />

integrated pulse measurements, while screens allow single shot measurements, which are<br />

destructive. The phosphor screens are used where the beam size is large and diffuse in BC1 and<br />

BC2. The profile monitors are used to measure transverse emittance (ε), energy spread (δ), or<br />

bunch length (σz), as indicated in the table. The rms transverse beam size listed, σx,y, is the x (≈ y)<br />

size in the case of emittance measurements, the x size in the case of energy spread, and the y size<br />

in the case of bunch length. Beam size measurement resolution of ≤10% is required with a charge<br />

level as low as 0.2 nC per bunch.<br />

7-110 ♦ A C C E L E R A T O R

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