Experimental beam dynamics in the SLC (SLAC Linear Collier) linac

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6365768

Steeman, J T; Campisi, I E; Herrmannsfeldt, W; Lee, M

The component installation for the upgrade of the three-kilometer linac for the SLAC Linear Collider (SLC) was completed in late summer 1986. The system status and measurements of beam properties made during commissioning are described in this paper. In summary, a low-emittance electron beam from a damping ring has been accelerated through the linac and injected into the north SLC Arc with negligible loss. The maximum bunch intensity is 2.9 x 10 electrons/pulse. A peak particle energy of 53 GeV has been reached. Operation at 47 GeV is now routine. The energy and energy spectrum of the electron beam can be rapidly measured nondestructively at high energy. These signals will be used in a fast feedback system nearing completion. The electron beam can be centered in the accelerator to about 200 m rms. Slow feedback of the injection position and angle into the linac and injection into the north Arc are operational. Longitudinal and transverse wakefields have been measured and appear to be near expectations. Transverse position measurements at the end of the linac show a 120 m horizontal and a 30 m vertical (rms) jitter from pulse to pulse. The spot shape, including the transverse tails, also shows some jitter. The transverse position and shape fluctuations have several sources involving launch instabilities, chromatic effects, RF deflections and lattice mismatches. Continued improvements are expected. These parameter jitters would not preclude collisions. The measured invariant transverse emittances of the beam at 47 GeV are 2 x 10 V rm vertically and 12-25 x 10 V rm horizontally at 1 x 10 e . The horizontal emittance increases with beam intensity. Damped positrons have been injected into the linac, and trajectory correction is underway.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA); Lawrence Berkeley Lab., CA (USA); California Univ., Santa Cruz (USA); California Inst. of Tech., Pasadena (USA)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6365768
• Report Number(s): SLAC-PUB-4181; CONF-870302-206; ON: DE87011587
• Resource Relation: Conference: Particle accelerator conference, Washington, DC, USA, 16 Mar 1987; Other Information: Paper copy only, copy does not permit microfiche production. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
STANFORD LINEAR COLLIDER
BEAM DYNAMICS
PERFORMANCE TESTING
BEAM EMITTANCE
BEAM MONITORS
BEAM PROFILES
CORRECTIONS
ENERGY SPECTRA
EXPERIMENTAL DATA
ACCELERATOR FACILITIES
ACCELERATORS
DATA
INFORMATION
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MONITORS
NUMERICAL DATA
SPECTRA
TESTING
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics