Physics design of the high brightness linac for the advanced free-electron laser initiative at Los Alamos

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5272596

Sheffield, R L; Browman, M J; Carlsten, B E; Young, L M

Free electron lasers and high energy physics accelerators have increased the demand for very high brightness electron beam sources. This paper describes the design of an accelerator which can produce beams of greater than 7 {times} 10{sup 11} A/m{sup 2} (brightness = 2*1/{var epsilon}{sup 2}, with {var epsilon} = 90% normalized emittance = 4* rms emittance). The beam emittance growth in the accelerator is minimized by the following: producing a short electron bunch in a high gradient rf cavity, using a focusing solenoid to correct the emittance growth due to space charge, and designing the coupling slots between accelerator cavities to minimize quadruple effects. The simulation code PARMELA was modified for this design effort. This modified version uses SUPERFISH output files for the accelerator cavity field, MAFIA output files for the 3-D perturbation fields due to the coupling slots in the accelerator cells, and POISSON output files for the solenoid field in the gun region. The results from simulations are, at 2.3 nC, a peak current of 180 A and a 90% emittance of 9.4 {pi} mm-mmrad. The exit energy from the linac is 20 MeV for both cases. A magnetic pulse compressor can be used to further increase the peak current. 8 refs., 10 figs.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5272596
• Report Number(s): LA-UR-91-3091; CONF-9108118-5; ON: DE92000179
• Resource Relation: Conference: 13. international free-electron laser (FEL) conference, Santa Fe, NM (United States), 25-30 Aug 1991
• Country of Publication: United States
• Language: English

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42 ENGINEERING
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ELECTRON BEAMS
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BEAM EMITTANCE
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SPACE CHARGE
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