1. IBBelle: Status & Plans
2-phase CO2 cooling system for PXD and SVD
Minimal temperature: - 40oC (intended: -30oC)
Cooling power: 3 kW (needed: ~1060 W)
Developed by NIKHEF (MARCO prototype built at MPP)
Version for ATLAS IBL (built by NIKHED/CERN, some components by MPP)
In operation at CERN
Copy* for Belle II under construction at MPP
*except: control system changes from PVSS to EPICs

2. Commissioning
Install and debug software (necessary changes, EPICS!): PLC EPICS:
Check complete setup (with CERN expert)
Basic functionality tests (SCADA instructions and expert commands).
Pressurize complete system with N2 and check for tightness.
Fill with liquid CO2, run without insulation (cannot reach design temperature)
Complete foam insulation
Operate at design temperature
Safety inspection => June 29/30
Long term tests => July and later at KEK
Response to change of operation conditions (load on/off…)
Exercise maintenance and emergency scenarios.

3. Commissioning Test for dry out: Tset = -30°C, flow: 12 g/s
Increase heater power: 2500W => 2950W
2900W
2950W
2750W
2800W
Flux increased to 16 g/s
2500W
Heater surface temperature
Dry out
Dry out can be controlled by increasing flux
Gas temperature at outlet of heater is not very sensitive to dry out!

4. Commissioning Optimization of regulation parameters
Setpoint of superheating after main heat exchanger
Choose setpoint to achieve lowest CO2 temperature

5. Commissioning Power off:
Regulation in the range of 1000W – 3000W works without problems
But switching off from 1000W to 0W causes instabilities
Regulation is too slow and the chiller switches off
Solution: Dummy load of internal heater (tested, works)
Tuning of regulation parameters (in progress)

6. New Features
CO2 monitor (with flashlight and sound) was installed (can be read by EPICS)
Gauge to weigh accumulator and measure the CO2 content

7. Interlocks IBBelle outputs 3 interlock signals DSS_AL1: IBBelle off/on
DSS_AL2: IBBellle interlocked
DSS_AL3: IBBelle running, but chosen temperature not yet reached
Inverted logic: signal is true if alarm is off

8. Services Compressed air (6 bar, ok)
flexible tube (standard) will be provided by MPP
sample of connection pipe at KEK
Water pipe connection (25°C, 3 bar)
Flexible hose sufficient. Sample of connection type at KEK.
Network
Lan required, power for switch close to JB (Ito-san)
CO2 connection IBBelle  transfer line  JB
VCR, 3/8 and 1/2 inch.
CO2 Connection JB <-> manifolds:
Vacuum for Flex lines:
10-7 bar => ok
400V 3-phase transformer

9. Still to do Monitoring of environment (humidity, temperature)
R404a filling: By company. Quantity: 12 kg. Needed in October
CO2 filling: by us or KEK group, need 3 bottles 50kg (with rising pipe) in B1
Crane tool
Fork to lift pumps with the crane (only if unit B installed)
Documentation
In work, will be at:

10. To and in KEK
Shipment in August (week 34) => 40 days => arrival early October
Company: ITK / K-Line Logistics
Will be humidity protected (packing by specialized company)
Will come in a 40’ container (with JB etc)
Unpacking at Tokyo port, with truck to KEK and into hall
Formalities in preparation with KEK (Tsuboyama-san)
Commissioning starting in October (by MPP team)
Make connection tube as soon as IBBelle, JB and manifold is in place
Service connection (electricity, water, air)
Pressure tests
Fill wit R404A (company) and CO2
Commission with internal heater (and/or JB ?)
Connect to transfer lines and JB
Interlocks
EPICS implementation
Prepare for cold tests of flexlines (December?)
Training of KEK operation team