SPring-8, the large synchrotron radiation facility

Year

Month/
Day

    Events

References

1997

  3/13

Commissioning of Storage ring started.

     SPring-8 Research Frontiers 1997/1998, p.56. / Proc. of PAC99, p.2346.

3/25

   Capture of electron beams in RF buckets succeeded.

4/17

    Stored beam current of 19.6 mA was achieved.
            (Beam lifetime ~3 hrs with ID gaps fully open)

5/14

Commissioning of beamlines (BL02B1 and BL47XU) started.

10/10

   User experiments with 10 public-use beamlines began.

1998

5/13

   Stored beam current of 100 mA was achieved.
            (60 mA from Oct. 2 and 70 mA Oct. 23 at user experiments)

9

Operation point was changed to reduce vertical emittance.

9

Periodic orbit correction started in user experiments.

1999

6/3

Stored beam current of 100mA was in service in user experiments.

7/1

    Production of 2.4 GeV Laser-Electron-Photon beam at BL33LEP succeeded.

Nuclear Physics A,684, 2001, p.71.

8

    Infrared beamline (BL43IR) was constructed.

NIM, A467-468(2001)p.441.

9

Optics was changed from “Hybrid Optics”(β were alternatively high and low) to “HHLV Optics”(High Horizontal β and Low Vertical β for all straight section).

SPring-8 Research Frontiers 1998/1999, p.85.

９

Correction of vertical dispersion by skew quadrupole magnets was done.

2000

1

Operation of RF A-station started to assure long beam life under many insertion devices in use.
    (Additional installation of RF A-station at Aug. 1999 as a fourth RF station)

SPring-8 Research Frontiers 1998/1999, p.86.

１

Correction of horizontal dispersion was done.

３

Performance improvement of periodic orbit correction I:
12 sets of air-core type steering magnets with high resolution were installed and new algorithm was in service.

   SPring-8 Research Frontiers 2000/2001, p.104.

９

30 m long magnet-free straight sections were constructed.

SPring-8 Research Frontiers 1999/2000, p.96. /NIM, A486 (2002) p.521.

9

   Slow feedback correction of ring circumference variation by changing RF frequency started to keep stored beam energy constant.

9

Feedback correction of coherent synchrotron oscillation started in user operation.

2001

2

        Project of beam orbit stabilization started.

SPring-8 Research Frontiers 2000/2001, p.104.

9

Three DC septum magnets were replaced for preparation of top-up operation.

9

Impedance of injection bump magnets was matched for preparation of top-up operation.

2002

１

Current ripples and drift of quadrupole magnet power-supplies reduced for orbit stabilization.

2

Recovery of optics symmetry was carried out by trimming quadrupole fields to enlarge dynamic aperture.

5

Measures to reduce vibration of vacuum chambers excited by cooling water flow were carried out for orbit stabilization.

  SPring-8 Research Frontiers 2001B/2002A, p.126.

７

Increase of stored beam current up to 120 mA was tested.

9

Performance improvement of periodic orbit correction II:
Twelve more air-core type steering magnets were installed. (12 sets to 24 sets)

SPring-8 Research Frontiers 2003, p.133.

９~11

10T Super Conducting Wiggler was installed on storage ring and performance test was had been done. (Test also done at Nov.)

SPring-8 Research Frontiers 2003, p.136. /
Proc. of PAC03, p.250.

11

New optics with the distributed dispersion in straight section ("Low Emittance Optics" with 3 nm⋅rad) was used in user experiments.

2003

5

Beam collimator to scrape horizontal beam tail was installed in beam transport line from synchrotron to storage ring (SSBT) to increase injection efficiency.

９

Test of top-up injection was carried out.

10

Optics was returned to old optics “HHLV Optics” from “Low Emittance Optics”, because injection section vacuum chamber was broken by bombardment of aborted electron beam owing to nonlinear dispersion of “Low Emittance Optics”.

SPring-8 Research Frontiers 2004, p.156.

10/16

Regular beam injection with Main Beam Shutter of front-end open and with free tuning of insertion device started (from operation cycle-7 in 2003).
Top-up Phase-1 started.

SPring-8 Research Frontiers 2003, p.133.

2004

1

       Bunch-by-bunch feedback started in user operation (from operation cycle-1 in 2003).

SPring-8 Research Frontiers 2004, p.154. / Proc. of EPAC04, p.2649.

2/26

Injection bump leakage by sextupole magnets within a bump orbit was suppressed by new scheme of optimizing sextupole nonlinearity (from operation cycle-2 in 2003).

NIM, A539, 547(2005).

5/20

   Top-up operation started with constant injection interval of 1 min. or 5 min. in user experiments (from operation cycle-4 in 2004).
Top-up Phase-2 started.

  SPring-8 Research Frontiers 2004, p.152. /
                Proc. of EPAC04, p.222.

9/23

      Alternative top-up beam injection to SPring-8 Storage ring and NewSUBARU storage ring started (from operation cycle-6 in 2004).

   Proc. of EPAC04, p.1327.

9/23

Performance improvement of periodic orbit correction III:
Power supplies for twenty-four horizontal and vertical steering magnets were improved in field setting resolution to increase the number of steering magnet from 24 sets to 48 sets (from operation cycle-6 in 2004).

2005

9/22

“Low Emittance Optics (3nm⋅rad)" was used again, and top-up operation with this optics started.
(New vacuum chamber at injection section was installed.)

   Proc. of EPAC06, p.3359.

2006

5

Bunch-by-bunch feedback system was adapted for hybrid filling with high-current (>1.5mA) singlet bunches. (Original system could treat singlet bunches with a bunch current below 1mA.)

   Proc. of EPAC08, p.3284.

5

Feedback of power supplies for bending magnets in the beam transport line SSBT was modified to stabilize the injection beam orbit.

9

BPM electronics were replaced to improve the performance of orbit measurement.
(Resolution and speed were improved.)

   SPring-8 Research Frontiers 2006, p.180.

9

The number of auxiliary power supplies for trimming quadrupole fields was increased from 13 to 48 to make efficient correction of optics distortion.

11

Automatic routine measurement of bunch impurity during top-up operation started.

2007

2

Linear difference resonance was suppressed to improve brilliance by using skew quadrupole magnets installed in long straight sections.

   Proc. of EPAC08, p.3035.

9

Remote tilt-control system of a bump magnet was installed for suppressing vertical oscillation of a stored beam at injection.

   Proc. of EPAC08, p.2172.

9

Dynamic aperture was enlarged by using counter-sextupole magnets installed in long straight sections (Injection efficiency and beam lifetime were improved).

   Proc. of EPAC08, p.3149.

11

Injection scheme of top-up operation was changed from a interval-prior mode to a current-prior mode to improve stability of a stored beam current.
(Current stability was improved from 0.1% to 0.03%.)

   Proc. of EPAC08, p.36.

2008

4

Power supplies for eighty steering magnets of iron-core type were modified to improve field setting resolution. (These are to be used in periodic orbit correction step by step after checking their performance.)

5

Use of air-core type steering magnets was stopped for periodic orbit correction due to narrow dynamic range, and iron-core type steering magnets of the same number were put to use with the improved power supplies.

2009

5

The number of skew quadrupole magnets was increased to improve the efficiency of coupling correction of linear resonance.

10

The RF knock-out (RFKO) system to generate a purified bunch in the synchrotron was doubled for improvement in reliability.

10

Power saving operation of the synchrotron (intermittent excitation of magnets) started.

2010

1

        Operation of an improved pulsed kicker magnet system started to suppress residual horizontal oscillation of a stored beam.

1

The bunch-by-bunch feedback (BBF) system was upgraded and the vertical chromaticity was reduced from 6 to 2.  (The low vertical chromaticity operation became possible for a beam with high bunch current.)

10

6

9

4

4

12

2013

1

5

6