Progress of BEPCII Storage Ring Construction

5th BEPCII IMAC Meeting - 1 - May 10 - 12, 2007

Progress of BEPCII Storage Ring Construction

Ma Li

May 10, 2007


The BEPCII serves the purposes of both high energy physics experiments and synchrotron radiation applications.

Design goal of BEPCII


Main Parameters of BEPCII


Layout of BEPCII

N

SC cavities

e+ inj. point e inj. point

SC IR magnets BESIII


Goal and schedule of ring in 2006/2007 Goal of 2006

– Complete the installation of all equipments (except superconducting IR magnets)

– Try to start the SR user operation

Scheduleplan 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


Main tasks of the ring systems

Magnet 300-plus dipoles, quads, sextupols, correctors

Vacuum 200-plus chambers, 175 photon absorbers, 150 bellows …

Align & Install 84 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 …

AP lattice design, high-level software, beam instability study …

PS 300-plus PS, magnet coil temperature monitor …

Injection 4 injection kickers and PS

Control PSC/PSI, network, timing, database, software develop …

Instrumentation 138 BPM, DCCT, BCM, BLM, tune meter, TBF …

Pay more attention to critical paths


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


Pre-assembly and pre-alignment


Alignment in the tunnel


Installation of vacuum components



Installation of magnet rafts


2006/03/26 East SC cavity assembly completed

2006/04/28 West SC cavity assembly completed

2006/06/30 Q0 of east SC cavity reached to 5.5×108 @2MV (design goal is 5×108)

2006/07/31 East SC cavity positioned and aligned in the ring tunnel

2006/08/26 Q0 of west SC cavity reached to 9.9×108 @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


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


Assembly and tunnel installation of superconducting cavity


LLRF installation and commissioning


Horizontal high power test of east superconducting cavity


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


Critical path 3: IR magnets and chambers


Installation superconducting IR magnets and valve-box


Horizontal test of superconducting IR magnets


Backup scheme with 2 dipoles (April, 2006)

With this 2-dipole backup scheme, the collision mode cannot be commissioned.


原有

2700X970X628(支架长X宽X )高 2700X970X628(支架长X宽X )高 1800X1200(长X )宽

东

南

西

北

原有

批准

R0版本号

A0

图幅

审核

计算机文件名

设计编号更改单修改更改内容日期

中国科学院高能物理研究所 I HEP-BEPCI I

共张

比例1: 15

未注公差的尺寸

重量

第张

数量对撞区设备布置图

1序号

2

绘图

批准

审核校核

审定会签

设计

13 (GB1804-79)按级公差制造

绘图软件名AutoCAD2004

谱仪中心轴

2. 7长 M支架中心线

图号名称数量备注材料总重12345

9876

141312

1011

序号

1800X1200(长X )宽

谱仪轨道钢板谱仪轨道钢板

2对撞区代用方案

李春华

21

-对撞区总体 lch

R4 R3

束流中心

水泥支撑台水泥支撑台

16171819

15

202122232425

ISPBQ1aQ1b ISPB Q1a Q1b

26

单重

I P对撞点

小B铁160Q 160Q

I P对撞点

BEPC magnet supports are used to saving time and cost

Change scheme with 2 quads and 1 dipole (September, 2006)


Installation of IR components


Systems not on the critical path

AP lattice design, high-level software, beam instability study …

Power Supply 300-plus PS, magnet coil temperature monitor …

Injection 4 injection kickers and PS

Control PSC/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.


impedance measurement solenoid for suppressing ECI


Commissioning and test of the magnet PS


Injection kickers and PS


Installation and commissioning of PS control system


Center control room


BPM


Synchrotron light monitor


Transverse beam feedback system


Step-by-step inspection performed before the commissioning

开机后发现仍然有差错– 内、外环电源搞错– 磁铁极性接反– 部分磁铁线包有短路

经验：不同人员反复检查


Milestone of ring commissioning2006/09/22 First meeting of the Ring Commissioning Group led by Jiuqing Wang


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 6mA×6mA

2007/04/10 150mA ebeam current reached

2007/04/21 100mA ebeam current reached

Jiuqing will give detailed descriptions for the ring commissioning.


Equipment failures and problems 2007/1/2, 2007/4/26 and 2007/5/9, three primary windings of 10kV rectifier tran

sformer of ring main dipole magnet PS had broke down, respectively. There are 8 transformers, with 3 such windings each. It is quality problem.

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.

2007/1/7, compressor of cryogenic system shut down due to water-cooling problem. It was recovered 20 hours after.

2007/2/11, cryogenic system failure, causing superconducting RF cavity warm up to 20K. It was recovered 17 hours after.

2007/2/13, compressor of cryogenic system shut down due to a misoperation. It was recovered 8 hours after.

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.

During commissioning, RF trip frequently occurred by vacuum, arc, quench, klystron pump PS, and sometimes noise, 2-3 times per day on average.

Sometimes beam loss happened during the energy ramping from 1.89GeV to 2.5GeV.


Main tasks of ring in 2007 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

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


Schedule of IR

2007/04/30-2007/05/10 SCQ and SSM cool-down2007/05/11-2007/06/03 cryogenic system commissioning and SCQ high power test2007/06/04-2007/07/31 SCQ field measurement with SSM2007/08/01-2007/08/22 move SCQ into IR2007/08/23-2007/09/21 SCQ field measurement in IR without detector2007/09/22-2007/10/10 install IR components

2007/10/11-2008/02/09 commissioning (4 months)2008/02/10-2008/03/20 SR user operation2008/03/21-2008/05/07 move BESIII detector into IR2008/05/08-2008/06/22 BESIII tuning2008/06/23-2008/12/31 BESIII physics operation


Modification of SC IR magnet valve-box and current leads


Superconducting IR magnets are ready for field measurement


SCQ chamber Y-shape

ISPB chamber


Open questions

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?

Whether the phase-lock loop between master oscillators of the injector linac and the rings is necessary?


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.


Thank you for attentions !

Documents

Progress of BEPCII Storage Ring Construction