5th BEPCII IMAC Meeting - 1 - May 10 - 12, 2007 Progress of
BEPCII Storage Ring Construction Ma Li May 10, 2007 Slide 2 5th
BEPCII IMAC Meeting - 2 - May 10 - 12, 2007 The BEPCII serves the
purposes of both high energy physics experiments and synchrotron
radiation applications. Design goal of BEPCII Slide 3 5th BEPCII
IMAC Meeting - 3 - May 10 - 12, 2007 Main Parameters of BEPCII
Slide 4 5th BEPCII IMAC Meeting - 4 - May 10 - 12, 2007 Layout of
BEPCII N SC cavities e + inj. point e inj. point SC IR
magnetsBESIII Slide 5 5th BEPCII IMAC Meeting - 5 - May 10 - 12,
2007 Goal and schedule of ring in 2006/2007 n Goal of 2006 Complete
the installation of all equipments (except superconducting IR
magnets) Try to start the SR user operation n Schedule plan
achieved 2006/03/02 start installation of storage ring 2006/10/10
2006/11/12 start outer ring commissioning (backup scheme)
2006/11/09 2006/11/25 start SR beam line commissioning and user
operation 2006/12/29 2007/02/06 start commissioning e ring
2007/01/26 2007/03/03 start commissioning e ring 2007/03/25 first
beam collision (backup scheme) 2007/06/15 start SR user operation
(backup scheme) 2007/02/23 2007/08/01 SCQs move into the IR (about
5-month delay) 2007/04/01 start commissioning e ring with SCQ
2007/04/21 start commissioning e ring with SCQ 2007/05/11 start
commissioning for collision mode Slide 6 5th BEPCII IMAC Meeting -
6 - May 10 - 12, 2007 Main tasks of the ring systems Magnet300-plus
dipoles, quads, sextupols, correctors Vacuum200-plus chambers, 175
photon absorbers, 150 bellows Align & Install84 pre-assembly
magnet rafts, survey and align, install RF 2 SC cavities and PS,
LLRF IR 2 SC IR magnets, 10 special magnets, IR chamber APlattice
design, high-level software, beam instability study PS300-plus PS,
magnet coil temperature monitor Injection4 injection kickers and PS
ControlPSC/PSI, network, timing, database, software develop
Instrumentation 138 BPM, DCCT, BCM, BLM, tune meter, TBF Pay more
attention to critical paths Slide 7 5th BEPCII IMAC Meeting - 7 -
May 10 - 12, 2007 Critical path 1: Pre-assembly and installation
2006/02/end Complete all 80 arc chambers, including correction of
20 distorted chambers. 2006/03/02 Start installation of the first
magnet raft in the ring tunnel. Only 31 of 84 rafts (37%) had been
completed at the time. According to schedule, 2 rafts have to be
completed in 5 days. No weekend and holidays. 2006/07/18 Start PS
test and combined commissioning with magnets and control, in
parallel with installation. 2006/08/21 Complete TiN coating of 70
positron beam pipes 2006/09/10 Complete installation of last magnet
raft in the ring tunnel 2006/10/29 Complete installation of all
chambers and vacuum components 2006/11/09 Complete fine alignment
of the ring magnets 2006/11/12 Start ring commissioning Slide 8 5th
BEPCII IMAC Meeting - 8 - May 10 - 12, 2007 Pre-assembly and
pre-alignment Slide 9 5th BEPCII IMAC Meeting - 9 - May 10 - 12,
2007 Alignment in the tunnel Slide 10 5th BEPCII IMAC Meeting - 10
- May 10 - 12, 2007 Installation of vacuum components Slide 11 5th
BEPCII IMAC Meeting - 11 - May 10 - 12, 2007 Slide 12 5th BEPCII
IMAC Meeting - 12 - May 10 - 12, 2007 Installation of magnet rafts
Slide 13 5th BEPCII IMAC Meeting - 13 - May 10 - 12, 2007
2006/03/26 East SC cavity assembly completed 2006/04/28 West SC
cavity assembly completed 2006/06/30 Q 0 of east SC cavity reached
to 5.510 8 @2MV (design goal is 510 8 ) 2006/07/31 East SC cavity
positioned and aligned in the ring tunnel 2006/08/26 Q 0 of west SC
cavity reached to 9.910 8 @2MV 2006/09/07 West SC cavity positioned
and aligned in the ring tunnel 2006/10/29 East SC cavity
conditioned to 1.5MV, in parallel with installation 2006/10/31 West
SC cavity conditioned to 1.5MV, in parallel with installation
2006/11/04 Commissioning of east SC RF system completed and ready
for beam 2006/11/12 Start ring commissioning 2007/02/26 West SC
cavity put into operation with beam S.Kurokawa, K.Hosoyama,
T.Furuya, K.Akai, S.Mitsunobu of KEK came here many times during
test and commissioning of SC cavities. Thanks a lot. Critical path
2: superconducting RF system Slide 14 5th BEPCII IMAC Meeting - 14
- May 10 - 12, 2007 Assembly and tunnel installation of
superconducting cavity Slide 15 5th BEPCII IMAC Meeting - 15 - May
10 - 12, 2007 LLRF installation and commissioning Slide 16 5th
BEPCII IMAC Meeting - 16 - May 10 - 12, 2007 Horizontal high power
test of east superconducting cavity Slide 17 5th BEPCII IMAC
Meeting - 17 - May 10 - 12, 2007 2006/06/21 Q1a, Q1b, ISPB, Q2, Q3
passed acceptance test 2006/08/18 Two superconducting IR magnets
cooled-down 2006/08/end Two superconducting IR magnets and PS,
quench protection system tested. The magnets are powered with
20-50% rated current. PS and quench protection system showed a good
performance. Valve-box and current leads have to be modified. 2-Q
and 1-B backup scheme was proposed to replace 2-B scheme.
2006/09/29 Two superconducting IR magnets moved out off the ring
2006/10/begin BPM welding on the OFHC IR chambers had some
troubles. Decide to fabricate substitutions of stainless steel
chambers for OFHC chambers. 2006/10/26 Complete fabrication of
stainless steel IR chambers 2006/10/29 Complete installation of IR
chambers and vacuum pumps 2006/11/05 Complete cable connections and
chamber baking 2006/11/10 Complete combined commissioning of IR
magnets, PS and control systems 2006/11/12 Start ring commissioning
Critical path 3: IR magnets and chambers Slide 18 5th BEPCII IMAC
Meeting - 18 - May 10 - 12, 2007 Installation superconducting IR
magnets and valve-box Slide 19 5th BEPCII IMAC Meeting - 19 - May
10 - 12, 2007 Horizontal test of superconducting IR magnets Slide
20 5th BEPCII IMAC Meeting - 20 - May 10 - 12, 2007 Backup scheme
with 2 dipoles (April, 2006) With this 2-dipole backup scheme, the
collision mode cannot be commissioned. Slide 21 5th BEPCII IMAC
Meeting - 21 - May 10 - 12, 2007 BEPC magnet supports are used to
saving time and cost Change scheme with 2 quads and 1 dipole
(September, 2006) Slide 22 5th BEPCII IMAC Meeting - 22 - May 10 -
12, 2007 Installation of IR components Slide 23 5th BEPCII IMAC
Meeting - 23 - May 10 - 12, 2007 Systems not on the critical path
APlattice design, high-level software, beam instability study Power
Supply300-plus PS, magnet coil temperature monitor Injection4
injection kickers and PS ControlPSC/PSI, network, timing, database,
software develop Instrumentation 138 BPM, DCCT, BCM, BLM, tune
meter, TBF All efforts have been made to prevent these systems from
becoming a new critical path. Slide 24 5th BEPCII IMAC Meeting - 24
- May 10 - 12, 2007 impedance measurement solenoid for suppressing
ECI Slide 25 5th BEPCII IMAC Meeting - 25 - May 10 - 12, 2007
Commissioning and test of the magnet PS Slide 26 5th BEPCII IMAC
Meeting - 26 - May 10 - 12, 2007 Injection kickers and PS Slide 27
5th BEPCII IMAC Meeting - 27 - May 10 - 12, 2007 Installation and
commissioning of PS control system Slide 28 5th BEPCII IMAC Meeting
- 28 - May 10 - 12, 2007 Center control room Slide 29 5th BEPCII
IMAC Meeting - 29 - May 10 - 12, 2007 BPM Slide 30 5th BEPCII IMAC
Meeting - 30 - May 10 - 12, 2007 Synchrotron light monitor Slide 31
5th BEPCII IMAC Meeting - 31 - May 10 - 12, 2007 Transverse beam
feedback system Slide 32 5th BEPCII IMAC Meeting - 32 - May 10 -
12, 2007 Step-by-step inspection performed before the commissioning
n n Slide 33 5th BEPCII IMAC Meeting - 33 - May 10 - 12, 2007
Milestone of ring commissioning 2006/09/22 First meeting of the
Ring Commissioning Group led by Jiuqing Wang 2006/11/12 Start ring
commissioning 2006/11/18 First e beam storage in outer ring (SR
ring) 2006/12/25 Start SR user operation 2007/02/02 Stop SR user
operation 2007/02/09 First beam storage in e ring 2007/02/18 Spring
Festival (7-day holiday) 2007/03/04 First beam storage in e ring
2007/03/25 First trial of beam collision at 6mA6mA 2007/04/10 150mA
e beam current reached 2007/04/21 100mA e beam current reached
Jiuqing will give detailed descriptions for the ring commissioning.
Slide 34 5th BEPCII IMAC Meeting - 34 - May 10 - 12, 2007 Equipment
failures and problems n 2007/1/2, 2007/4/26 and 2007/5/9, three
primary windings of 10kV rectifier transformer of ring main dipole
magnet PS had broke down, respectively. There are 8 transformers,
with 3 such windings each. It is quality problem. n 2007/1/6,
compressor of cryogenic system shut down due to power line failure,
causing superconducting RF cavity warmed up to 40K. It was
recovered 26 hours after. n 2007/1/7, compressor of cryogenic
system shut down due to water-cooling problem. It was recovered 20
hours after. n 2007/2/11, cryogenic system failure, causing
superconducting RF cavity warm up to 20K. It was recovered 17 hours
after. n 2007/2/13, compressor of cryogenic system shut down due to
a misoperation. It was recovered 8 hours after. n 2007/1/30, a
quench happened during conditioning of east cavity. Pressure in
cryostat up to 1.26bara threshold due to quench protection system
was not functioned in 10ms, causing the safety valve opened. It was
recovered 21 hours after. n During commissioning, RF trip
frequently occurred by vacuum, arc, quench, klystron pump PS, and
sometimes noise, 2-3 times per day on average. n Sometimes beam
loss happened during the energy ramping from 1.89GeV to 2.5GeV.
Slide 35 5th BEPCII IMAC Meeting - 35 - May 10 - 12, 2007 Main
tasks of ring in 2007 n Hardware IR chambers (3 types of SCQ,
Y-shape and ISPB chambers) Superconducting IR magnets (high power
test, field measurement, installation) 14 fixed and 2 movable masks
n Commissioning and operation Collision mode (backup scheme)
One-month SR operation, beam lifetime 8-10 hours @150mA/2.5GeV
Collision mode with superconducting IR magnets Slide 36 5th BEPCII
IMAC Meeting - 36 - May 10 - 12, 2007 Schedule of IR
2007/04/30-2007/05/10 SCQ and SSM cool-down 2007/05/11-2007/06/03
cryogenic system commissioning and SCQ high power test
2007/06/04-2007/07/31 SCQ field measurement with SSM
2007/08/01-2007/08/22 move SCQ into IR 2007/08/23-2007/09/21 SCQ
field measurement in IR without detector 2007/09/22-2007/10/10
install IR components 2007/10/11-2008/02/09 commissioning (4
months) 2008/02/10-2008/03/20 SR user operation
2008/03/21-2008/05/07 move BESIII detector into IR
2008/05/08-2008/06/22 BESIII tuning 2008/06/23-2008/12/31 BESIII
physics operation Slide 37 5th BEPCII IMAC Meeting - 37 - May 10 -
12, 2007 Modification of SC IR magnet valve-box and current leads
Slide 38 5th BEPCII IMAC Meeting - 38 - May 10 - 12, 2007
Superconducting IR magnets are ready for field measurement Slide 39
5th BEPCII IMAC Meeting - 39 - May 10 - 12, 2007 SCQ chamber
Y-shape ISPB chamber Slide 40 5th BEPCII IMAC Meeting - 40 - May 10
- 12, 2007 Open questions n When is the suitable time for
installation of background masks? The east superconducting cavity
shows a different performance during commissioning of e ring. What
is the reason? n Whether the phase-lock loop between master
oscillators of the injector linac and the rings is necessary? Slide
41 5th BEPCII IMAC Meeting - 41 - May 10 - 12, 2007 Summary A big
progress for the construction and commissioning of the BEPCII
storage rings has been made since last IMAC meeting. It took about
16 months to complete the installation of BEPCII rings (except the
superconducting IR magnets and IR chambers) after the BEPC ring
shut-down in July 4, 2005. Commissioning of the BEPCII (with backup
scheme) started in mid November 2006. It is useful for us to gain
experience for the future commissioning with superconducting IR
magnets. Although there are some problems, basic equipments and
devices of ring systems show a good performance during the
half-year commissioning and operation. The final test of the
superconducting IR magnets with modified valve-box and current
leads is in progress. Success of the test is very important to
reach the goal of the BEPCII project in time. Slide 42 5th BEPCII
IMAC Meeting - 42 - May 10 - 12, 2007 Thank you for attentions
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