Welcome IMAC Members !

Welcome

IMAC Members !

Report to IMAC

Hesheng Chen

• Progress of BEPCII Accelerator

• Status of BESIII

• Summary

BEPC running ended July 4 2005

• SR running finished at 20 June 20, 2005– SR running: 3009 hour.– 362 experiments, 1087 users – 1751 hours for test beam & slow e+ source

• Machine studies: – high beam current, – e+ injection, – transverse feedback,– BPM, – response matrix, – …

BEPC running finished July 4, 2005

Milestones in the shutdown

• Pre-alignment of half units started 17 May 2005

• Remove old ring : July 4 – Aug. 5, 2005√• Survey network in tunnel for magnet alignment

Aug. 6 – Sept. 5, 2005 √

• Decoration tunnel: Aug. 25 – Sept. 22, 2005√• Transformer &Electricity upgrade, new water

pipes, cabling: Sept. 23, 2005 – Mar. 2, 2006 √.

• Installation of two rings: started 2 March,

30 units installed until today.

Delays in delivery and installation of some key devices

• SCQ: – delivery delayed about 6 month – Installation: more delay

• SCQ Valve boxes : – delivery delayed about 4 month– more delay installation

• Power Leads & valve boxes of BESIII SC magnet.

• Antechamber depressed:

Progress of Linac

• Tuning Phase I:– e+ available at the end of Linac March 19, 2005 – e+ reached 63mA @ 1.3GeV June 1, 2005– e- reaches 1.89 Gev & e+ 1.55 GeV June 17,2005– Repetition rate 12.5Hz →25Hz → 50Hz

• Shutdown July 4, 2005 – Feb. 28, 2006– Phase control system installed– Microwave system improved– Vacuum system improved– Stability of Linac and beam

• Tuning Phase II: March 1 – July 30, 2006

Linac commissioning (April-06)

Parameters Goal Measured

Beam energy (GeV) 1.89 1.89 (e-); 1.89 (e+)

Beam current (mA) e+ 40 63

e- 500 > 500

Repetition rate (Hz) 50 25-50

Emittance (1σ) ( mmm rad )

e+ 0.53 0.32 ~ 0.20

e- 0.067 0.080 ~ 0.096

Energy spread (%)

e+ 0.500.73@1.30GeV

(0.50@1.89Gev)

e- 0.50< 0.80@1.30GeV

< (0.55@1.89Gev)

Linac Tunnel and Klystron Gallery

Progress of Storage Ring Mass production of most components finished

2 superconducting RF cavities, 2 RF power sources (250kW), 2 superconducting quards, 49 dipoles, 89 quadrupoles, special magnets in IR, 300 power suppliers of magnets, 4 sets of injection magnet system, 80 antechambers. Instrumentations of beam diagnostics and control

in good progress. In progress:

the vacuum chambers of straight sections, photon absorber movable mask …

Progress of Storage Ring

• Critical path: – superconducting IR magnet, – pre-alignment – cryogenic system/SC devices integrating.

• Most of the hardware are in the stage of installation, testing and commissioning.

• Installation of pre-aligned magnet unit (B,Q,S with one girder) into the tunnel started March 2. 30 units installed

Simulation of installation

Installation of half unit (15-17.5 tone)

by air beds

Challenges• Cryogenics system: critical path

– Linde compressors and cryogenics arrived – Gas tanks, He gas pipes, N pipes: done – critical path : valve box, system tuning

• SC devices: critical path– SC Magnets production @BNL: small delay – SC cavities: arrived IHEP last week. – BESIII SC magnet: winding to be finished in 10 d

ays. Assembling / testing? reach the specifications ?

– Uncertainty in system tuning

• Field mapping

IMAC May 2005

IMAC report (May, 205)• There are apparent discrepancies between the schedule used

by the project office and the one used by the group leaders.• The completion of the cryogenic system can not be accurately

predicted due to the delivery of connection box from HIST and completion of transfer lines. So far, there is about 3 months delay.

• The delivery of vacuum chamber and the Ti-N coating also encountered possible delay of about 3 months and with no effective plan of recovery.

• Commissioning of all three SC components, SCQ, SRF, SSM also will be delayed by more than 3 months caused by the delay of completion of the cryogenic system. More `experienced` manpower is needed to complete the design and installation of the cryogenic transfer lines and smooth start up of the cryogenic system.

• The time allowed for combined field measurement with SCQ and SSM in place appears too tight.

Difficulties• The teams of cryogenics system and SC device

s are limited and shortage of experiences. However, Many helps from experts of DESY and KEK, the teams are shaping.

• Poor performance of HIT Inst. of SCC: delay, bad cooperation and poor management

• BESIII SC magnet: Wang NMR Co. in some troubles

• We could handle other problems, such as mechanics, control, electronics…

Spare Scheme of IR Delay & uncertainties of IR devices commissioning :

SCQ + Valve boxes: later arrival and delay in installation

BESIII SC magnetPossible further delay in installation,

commissioning and filed mapping A spare scheme of the IR lattice configuration without

SCQ is designed and under preparation . Two normal conducting bending magnets (70B) will

replace the two SCQ IR magnets. With this scheme, the outer ring (SR), the electron

ring and positron ring can be commissioned. The spare scheme is to save the time of about 3

months for the SCQ field measurement with detector solenoid and the field mapping of the detector solenoid itself.

Quality Control

Quality control system established: Quality control manuals Quality control forms Quality controller Review designs and prototypes Monitor quality and progress in factories

Most of cases are successful, while some cases have problems in quality and schedule for various reasons.

In case of problem, quality is the first. Over design happens some times.

BEPCII Summary Schedule

Linac Plan and Installation of Ring

Schedule• — 9 Oct. 2006:

– Installation of two rings– Tuning and commissioning of devices and

systems, including SCQ commissioning and field mapping

– Alignment • Oct. 06 - July. 07:

– Tuning of machine + SR running – Field mapping of SCQ + BESIII SC magnet – BESIII assembling and tuning

• Aug. 07: BESIII detector moved into beam line• Sept. 07 : Starting machine-detector tuning. • Data taking by Autumn 2007

The BESIII Detector

Be beam pipe

SC magnet Magnet yoke

MDC

CsI calorimeter

TOF

Draft Chamber Structure

Wiring of Draft chamber

MDC: inner part outer part

Wire Tension Distribution

MDC electronics

• 160 channel prototype system comics ray test and test beam • 512 channel system: final version • Oct. 2005 intl. review• Mass production under way

CsI crystal CalorimeterFrance

Sanit -Gobain

Shanghai Institute of Ceramics

Beijing

HamamatsuTotal

Order 2040(3000) 1920 1320 5280(6240)

Arrived 1727 1920 1220 4860

Rejected 43＋ ? 7+240? ~20 70＋ 240？

Calorimeter electronics

• FE under production • 3 beam test and and 384 channel prototype: re

ach the performance. Noise: 1000 e/crystal 。• Intl. review• On schedule

-- 32 --

Installation of RPC into endcap

-- 33 --

Mass production ---- Module testTest result of an endcap module ——after install

Test result of a barrel module

BESIII Magnet Progress包绝热膜 组装

运输

绕线

安装

Valve box of BESIII SC magnet

Power leads thermal leakage

-- 38 --

BESIII: work to be done • Challenge: BESIII SC magnet

– Power Leads – Test of Valve box– Cool down of Magnet– Performance & Stability – Field mapping

• Under construction – Structure of ECAL endcap– Assembling of subdetectors– Assembling BESIII– Tuning – Cosmic ray test

Cryogenics system

Gas tanks and pipes

TCF50s passed assessment

主压缩机14bar,78g/s

低温系统控制室

冷箱 150L/h500W@4.5K

Cryogenics pipes made in IHEP

各种低温外管道 各种低温内管道

各种 G10支撑件 8通道低温管线

Summary LINAC tuning goes smoothly with good progress. Manufacture of most of components of Storage

rings and detector goes well. Some delays and technical difficulties in SC components.

So far, no fundamental problem found in the machine and the detector.

We are in a difficult period with many problems in quality and schedule. Great challenges in next 18 month.

About 4 month delay in schedule so far. Thank you for helps from IMAC and many Labs