) CERN/EF/EHS-CC/78-54 12 June 1978 PROGRESS IN CERN ACTIVITIES FOR EHS, PART A 1. INSTALLATION IN EHNl Offices and laboratories in building 892 (block 4) are progressively being occupied by FHS staff, The programme for installation in EHNl is unchanged. The EHS huts should be available and the EHS area free by September 78. Agreement is reached on the lay-out of the rails for the RCBC handling trolley; the rails will be laid down starting mid August. The trolley itself is ordered from a French firm. EA group of SPS is now studying the ventilated hut enclosing all hydrogen carrying lines and equipment of RCBC. A closer look is now also given to the external hydrogen area. 2. Ml INFRASTRUCTURE The external power and safety circuit for Ml has already been established some time ago. The magnet team of BEBC is taking care of this part. Simplicity and reliability in operation was the main concern. The tender action for the power supply is under way. The auxiliary equipment (power breakers, precision shunt) was ordered and received at CERN. Air-cooled dump resistors are under construction as three separate modules. Agreement was also reached on CERN equipment to be used at Saclay for the test of individual Ml cryostats. The BEBC team will provide the power equipment (including one of the EHS resistor modules) and a data logger. Thus most of the external Ml equipment will not be needed at Saclay and can be installed in EHNl before the arrival of the first cryostat. The internal instrumentation of Ml was revised, cabling and connectors decided upon. The study of transfer lines, valve box and liquid helium storage dewar is taken up again. A tender action is started in view of ordering the main items before summer. 3. RCBC DEVELOPMENTS AND TESTS The first cold dynamic test of a GRP bellows glued provisionally to a stainless steel piston head started mid April. A leak developed soon on the GRP/stainless connection, not representative for the final piston bellows assembly. Repair turned out to be difficult and time consuming. Tests will start again mid June. It is agreed that, should the leak occur again, no other attempt to repair will be made and the bellows cycled with stresses coming mainly from stroke. Despite the leak problem, the test in the 1-m model of BEBC gave already useful information for the final'design, e.g. on lateral vibrations. Earliest possible availability of a fully representative GRP piston belJows assemhly for test in the 1-m model is very important.
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CERN/EF/EHS-CC/78-54 12 June 1978
PROGRESS IN CERN ACTIVITIES FOR EHS, PART A
1. INSTALLATION IN EHNl
Offices and laboratories in building 892 (block 4) are progressively being occupied by FHS staff, The programme for installation in EHNl is unchanged. The EHS huts should be available and the EHS area free by September 78. Agreement is reached on the lay-out of the rails for the RCBC handling trolley; the rails will be laid down starting mid August. The trolley itself is ordered from a French firm. EA group of SPS is now studying the ventilated hut enclosing all hydrogen carrying lines and equipment of RCBC. A closer look is now also given to the external hydrogen area.
2. Ml INFRASTRUCTURE
The external power and safety circuit for Ml has already been established some time ago. The magnet team of BEBC is taking care of this part. Simplicity and reliability in operation was the main concern. The tender action for the power supply is under way. The auxiliary equipment (power breakers, precision shunt) was ordered and received at CERN. Air-cooled dump resistors are under construction as three separate modules.
Agreement was also reached on CERN equipment to be used at Saclay for the test of individual Ml cryostats. The BEBC team will provide the power equipment (including one of the EHS resistor modules) and a data logger. Thus most of the external Ml equipment will not be needed at Saclay and can be installed in EHNl before the arrival of the first cryostat.
The internal instrumentation of Ml was revised, cabling and connectors decided upon.
The study of transfer lines, valve box and liquid helium storage dewar is taken up again. A tender action is started in view of ordering the main items before summer.
3. RCBC DEVELOPMENTS AND TESTS
The first cold dynamic test of a GRP bellows glued provisionally to a stainless steel piston head started mid April. A leak developed soon on the GRP/stainless connection, not representative for the final piston bellows assembly. Repair turned out to be difficult and time consuming. Tests will start again mid June. It is agreed that, should the leak occur again, no other attempt to repair will be made and the bellows cycled with stresses coming mainly from stroke. Despite the leak problem, the test in the 1-m model of BEBC gave already useful information for the final'design, e.g. on lateral vibrations. Earliest possible availability of a fully representative GRP piston belJows assemhly for test in the 1-m model is very important.
-2-
After 7.5 x 106
advances, the test rig for the cameras drive assembly broke down; adjustments and repairs were done on nearly each component and the testing is to be resumed soon on what is considered to be the final version of the drive mechanism.
A simplified data board printing system with 39 light guides is ordered to check manufacturing and space problems. First test were done to size the magnetic shielding needed to operate the relays in the ambient stray field (1200 G).
It was confirmed that magnetic spools can be used on the expansion power valves. A test at 10 kG proved satisfactory. In the same field (which is twice the expected value) also the chosen displacement transducer (Kaman) was operated. These tests are now considered as successfully terminated. A first test for the triple shielding of the pilot valve gave encouraging results. The valve operated up to 3000 G (expected field is 2500 G), but the loop gain had to be adjusted above 2000 G. Thicker shieldings are in preparation and will be tested.
Tender action for the aluminium support block,into which the expansion system will be integrated, is in progress.
The bases for the iron structure are in fabrication and should be delivered to CERN by end of September, in time for the erection of the Ml/RCBC support structure in EHNl.
4. EHS ELECTRONICS
After discussion with several firms and study of systems used at CERN, a fault indication and alarm system for the EHS control room was ordered from the British firm Farnel.
The logic for testing two state signals (''matrix'') was further tested and the final version built. The dialogue with the monitoring computer was developed as well as the programme which carries out the scan of the switch states.
An opto-coupler circuit for connecting two-state signal sources to the matrix, providing on the entry side "intrinsic hydrogen safety" for use with equipment in the hydrogen area of RCBC, was designed, tested and approved by the CERN Safety Group.
In order to organize in a rational way installation and maintenace of EHS cables, a technical note defining a simple code for cable identification was distributed to EHS users for comments.
A similar note specifiying an EHS identification code for sensors, instruments and equipment is prepared and will soon be sent out.
An INTEL 80/20 microcomputer with an analog multiplexer and analogdigital converter was bought and tested. This system will be used to sample and store the piston position and pressure curve of RCBC. An interface to the NORD-10 computer has been designed and a direct memory access channel is being studied.
A simple temperature control logic coupled to a mains circuit breaker was studied and designed. It will be used to monitor racks with high power dissipation, in order to prevent damage to electronics equipment, such as the drift chamber digitizers.
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In order to permit the use of the EHS computers, when installed in EHNl, for programme development and hardware testing in the office building 892, the possibility of a serial CAMAC link between EHNl and building 892 was studied, some equipment purchased and the transmission cables specified.
As the specialists for the ESOP microprocessor system joined the EHS team and it is planned to use ESOP on EHS for fast trigger decisions, continuous attention is given to the development of the system. So a new multiport buffer and a 200 ns multiply unit were buiJt; three other units were designed, one being a fast shift and bit search unit particularly adapted to trigger applications.
In collaboration with EP Division, Amsterdam and Vienna, a faster read-out for the EHS drift chambers was stµdied. Tests were also made in order to improve the speed of the read-out bus.
In collaboration with the Padova group, the interface between the PM high voltage supplies for IGD and FGD and the NORD-10 computer was studied. For the remote contr~of the gamma detector supports, the main components were chosen and the controller specified; the latter will be based on a 8085 microprocessor. For IGD, advice was given on HV cables.
5. ON-LINE SOFTWARE
The CERN standard data acquisition package for NORD-lOs (DAS) has been adapted for use on EHS. This package supervises the movement of data through the computer and its output to mag-tape. It also looks after the scheduling of test and analysis programmes which may wish to access the data. No serious difficulties were encountered, although the great length (about 10 kw.) of EHS events and the large total buffer size needed (~50 kw.) cause some problems. Since programme+ buffer space exceeds the 64 kw. virtual address space of a 16 bit computer, it is necessary for DAS to manipulate a Page Index Table to "window" consecutive pieces of buffer into the programme's address space. Despite this, preliminary performance estimates with simulated EHS timing show a high system throughput. With a 50 kw. buffer a throughput of nine 10 kw. events in a 1 s spill is achieved - about 30% above original estimates.
All features of the Graphics and Histogramming Package (including graphic input) which are likely to be needed have now been tested.
Contacts have begun with the teams from the gamma detector collaboration who are expected to provide their own detectorspecific on-line software.
6. FINANCIAL STATUS
In Annex I the financial situation of the EHS, Part A Project is reviewed as per 1 June 197P..
7. INSTALLATION PROGRAMME
Annex II is the first edition of an EHS Installation Plot. It takes into account recently announced delays in the installation at CERN of RCBC, Ml and n
1 - D
6 as well as the shift of the long SPS shut-down
from the first to the second half of 1980.
D. Giisewell
EUROPEAN HYBRID SPECTROMETER, Part A (CERN Project D018)
Review of Financial Status
1) Material Cost Budget as Established at CC5 (CERN/EF/EHS-CC/77-22) for Price Level of November 1976:
Basic programme Contingency Total
A. Ml from CEA, Saclay 2.43 MSF 0.07 MSF 2.5 MSF B. CERN share of Part A 3.45 MSF 0.4 3.85 c. RCBC from RL 2.6 0.4 3.0
Total: 8.48 MSF 0.87 MSF 9.35 MSF
2) Financial Status as per 1 June 78:
Initial cost estimate Latest cost estimate Committed at CE~N Item of basic programme reduced to price le- or payed from CERN
vel of init. cost by date of status estimate
A. Ml from CEA, Saclay 4'814 KFF 4'814 KFF l '227 .6 KSF
B. CERN share of Part A Gen. installation in EHN 1 335 KSF 335 KSF 15.3 KSF Instr. & install. of RCBC 800 800 -Instr. & install. of Ml 730 730 30.2 Monitoring system 543 543 201.9 Data acquisition system 562 562 401.3 Proportional chambers 350 350 10.7 Install. of drift chambers 55 55 -Modif. & install. of M2 75 75 63.6
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3) Comments to the financial status:
A. Firm price in FF established at November 1976 level in Contract No, 590'176/EF, subject to a price revision formula. Last column gives effective payments made by CERN to CEA, Saclay.
B. Cost estimates established in SF at November 1976 price level. No revision of cost estimates, as no major changes occured by now. Last column gives total CERN commitments up to the date of this revision.
C., .Cost estimates established in E at February 1977 level in Agreement No. 590'174/EF, subject to a price revision formula. Last column gives amount committed at CERN for RCBC or paid to RL. The detail of the commitments made at RL for RCBC is given in the progress report of RL.
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