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Injector: BOOSTER Progress Report
Sources & accelerators Contents > Accelerators > BOOSTER Progress Report
BOOSTER Progress Report
Last Update : September 2004
MAGNETS
All the 36 dipole magnets were delivered by SIGMAPHI by the end of 2003. Hall probe mappings were performed at SIGMAPHI on 2 magnets and are in good accordance with the modelling.
 
A campaign of systematic relative comparison of the integrated field of all the magnets has been done, using a travelling coil bench. Over The spread at max field (0.74 T) is within ±0.15 % that is a factor of 2 below the tolerance (±0.3%). At injection field (0.027 T), the measured spread is enlarged up to ±0.5 %. This apparent spread is mainly due to low field sensitivity of the bench. We sort the magnets before installation so as to minimise the induced closed orbit errors. As no correction is foreseen at high field we focus the 0.74 T closed orbit minimisation down to 1 mm max. At low field, the closed orbit is about 5 mm.

The 44 quadrupoles were delivered by the Budker Institute (BINP) by the end of August 2004. Hall probe mappings were performed at the Budker Institute on the 2 first magnets and are in good accordance with the modelling.
 

A campaign of systematic measurements of gradient, horizontal and vertical magnetic center and tilt of all the magnets is undergoing, using a gradient coil bench. On the first 20 measured magnets we get a dispersion (min to max) of 100 µm for the magnetic center and a tilt of 1 mrad min to max. The gradient spread is of 0.1 %. All these results are under the tolerances.
 
The 28 sextupole magnets and the 44 steerer dipole magnets have been built by SEF and delivered. We plan to measure the gradient on few all the sextupoles. Furthermore, an Hall probe magnetic mapping is undergoing on one steerer at SEF.
 

VACUUM AND GIRDERS
 
All vacuum chambers are being manufactured by RIAL. There are 37 long dipole-sextupole-quadrupole tubes, about 40 pumping tees (+ BPM block) and a set of connecting tubes. They will be delivered in few batches, the last one being expected by November 2004. All the pumps, gauges and valves have been already delivered. A prototype of a long dipole-sextupole-quadrupole chamber was already delivered and fitted inside the magnets. All the girders and supports have been ordered to NORTEMECANICA. Tow prototypes have already been delivered and tested with the magnets in August. They all have been delivered by September 2004. At present time, a complete assembling of a girder with all the magnets and vacuum chambers has been successfully tested.
 
POWER SUPPLY

The 3 Hz dipoles (2) and quadrupoles (2) Power-Supplies are being built by BRUKER. The detail design, derived from the SLS booster PS, has been approved in June. The first of series will be receipt at factory at the end of September. The three others deliveries are scheduled on site by February 2005. The steerers PS were also ordered at BRUKER, and were delivered by the end of May. The 2 sextupoles PS are being built in-house and planned to be operational in December.
 


the 22 booster Quads 3Hz PS first of series
back view of the booster Quads 3Hz PS


R.F. SYSTEM
 
A 35 kW-352 MHz solid state amplifier will power a 5-cell copper cavity of the LEP type, donated by CERN. The complete booster plant, amplifier and cavity, was successfully tested up to 30 kW in June 2004. At present time, the amplifier has run about 1000 hours at 30 kW. The cavity conditioning was performed during few weeks. A pressure of 3. 10-9 mbar was obtained with 30 kW in 8 hours. At present time, we are testing the regulation loops (phase, amplitude and frequency).
DIAGNOSTICS
The BPMs will be equipped with the same electron beam position processors developed for the storage ring: the Libera modules by Instrumentation Technologies.
A few milestones:
  •   First batch delivery of 25 Libera for Booster needs: end of October;
  •   Application software and control system programming interface: mid November;
  •   Tango device server ready: end of November;
  •   Systematic tests by Diagnostics group: December;
  •   In-situ tests at ESRF: early February 2005

The other diagnostics (beam viewers, light and currents monitors, tune monitors...) will be available in time for installation.

The beam viewers are already received.

Light monitors: design completed; order mid October;
Current monitors: sensors already received and tested; ceramic gap and shielding (PMB) scheduled by end of November;
Tune monitors: stripline excitators will be delivered by the end of October.
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