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\newcommand{\cc }{$^{12}$C}
\newcommand{\cstar }{$^{12}$C*}
\newcommand{\oo }{$^{16}$O}
\newcommand{\mg }{$^{24}$Mg}
\newcommand{\na }{$^{23}$Na}
\newcommand{\be }{$^{8}$Be}
\newcommand{\si }{$^{28}$Si}
\newcommand{\su }{$^{32}$S}
\newcommand{\neon }{$^{20}$Ne}
\newcommand{\ca }{$^{40}$Ca}
\newcommand{\crr }{$^{48}$Cr}
\newcommand{\he }{$^{4}$He}
\newcommand{\al }{$\alpha $}
\newcommand{\gam }{$\gamma $--ray}
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\begin{document}

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\noindent
\begin{minipage}[t]{10cm}
\fbox{
\parbox[t]{5cm}{
{\large {\bf Minutes}}\\[2mm]
Charissa Group Meeting
}}\\[7mm]
\makebox[3.5cm][l]{Meeting held on:} 4 June 1998\\[2mm]            % Date
\makebox[3.5cm][l]{Meeting held at:} Birmingham \\[2mm]     % Place
\end{minipage}
\hfill \raisebox{-2.5cm}{
\psfig{figure=char-encap.ps,height=3cm}}\\[2mm]

\begin{center} \begin{tabular}{l@{~~}l} \hline
~\\								% Present
\makebox[2.5cm][l]{Present:} & \parbox[t]{13.5cm}{
BRF(Chair), SPGC, NMC, RLC, NC, NJD, MF, SSJ,
GRK, RCL, JSL, JTM, VP, WDMR, SMS, RPW, DLW
}\\
~\\								% Distribution
\makebox[2.5cm][l]{Distribution:} & \parbox[t]{12cm}{
Those above plus  WNC,RAC,RAH,JK,NAO\\ all by e-mail/file-server 
}\\
~\\ \hline
\end{tabular} \end{center}
~\\[0.5cm]
%\addtolength{\headheight}{2.5cm}
{\large {\bf Minutes}} \\[0.5cm]

\noindent 
\begin{list}{\bf \arabic{agenda}.}{\usecounter{agenda}
\setlength{\labelsep}{0.2cm}
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\item	 {\bf Apologies:} 

Apologies WNC (at GANIL), NAO and RAC (at Legnaro) 




\item {\bf ANU April 1998 running period}

Two new achievements on this run -- the first running of the hybrids
through the new electronics and DA and the first running in the
mixed hybrid -- strip arrangement.   The main problem encountered
was the degradation of the sheet detectors with radiation exposure
(principly the centre module).  Nevertheless, four experiments were
completed and the data analysis so far indicates the data is good.
Thanks to all those who were involved -- hard work, but adds more
good data to that taken with the strip detector setup in February.
Thanks also to Kate for producing a users guide to the new DA system
and to Vic for updating the MIDAS user guide (copies on server).

\item {\bf Plans for remaining work on ANU system}

\begin{enumerate}
 
 \item {\em DA system (updates and replacements)}
 
     The list of jobs identified duing the running period was discussed.
     Already, considerable progress has been made on this
     
\begin{enumerate}
     \item Get all documentation up to date:
     	 complete this after work on new PCB versions of modules is 
      complete. \action{RAH}

     \item Get all modules up to same mod.\  state:
        Will happen naturally when PCB versions are completed.
    
     \item Missing two words on Data Stacks:
        Fixed in new PCB version of FIACRE

     \item DA hangup problem: 
        Fixed in new FIACRE PCB version -- timeout installed
        
     \item Ripple (modulus 4 or 8) on some of TAILs:
        RH has installed simple trimmer in new TAIL to correct this

     \item Problem of long pulses:
        TAIL PCB version has user-selected MP (2,4,6 and 8$\mu $s), 
        Gate (4,8,12
        and 16$\mu $s) and Rundown (4 or 8$\mu $s)  

     \item Repair failed amps:
         working on this \action{SSJ}

     \item Repair fan out modules:
         working on this \action{SSJ}
     
     \item Install good earthing between all racks and crates to reduce noise:
         explore getting ANU to do this  \action{BRF}

     \item MIXER in crate number 3 has inputs 1 and 4 u/s:
         will go back to Oxford to be looked at \action{RAH}

     \item Explore DC offsets between MALU crates and correct procedure for
         setting discriminator level (does loading if look on scope cause
         a problem?):
         to go on ``longer term" list of work to be done out at ANU next trip

     \item Consider whether discriminator circuit on amps could be
         improved (e.g. depends on gain setting and susceptable to noise and
         effectively have two discs): 
         start looking into this \action{SSJ}
     
     \item Reliability of CAMAC crates (and need spares):
         get quotes \action{VP,SSJ}
         
     \item Need a spare serial crate controller:
         get a quote \action{VP}
     
\end{enumerate}


  \item {\em The MEGHA array}

\begin{enumerate}
     \item Pickup between gas and CsI:
         explore in tests - perhaps Strasbourg. \\ \mbox{} \action{DLW,RLC}
     
     \item Re-angle the outer modules to look at the 280mm target position:
         put on long term list

     \item Replace preamps on DOWN module
      
     \item Install CsI on all modules
     
     \item Correct the problem on target vacuum changing system
     
     \item Replace faulty valve on gas system
     
     \item Install target drive controller 
         
\end{enumerate}

 
  \item {\em Detectors (see RLC document on server)}
  
      The last runs have shown that we have a problem with the lifetime
      of the sheet resistance detectors under beam exposure.  After a few
      days running the detectors on the central module had experienced
      very severe effects. The main effect seemed to be that the charge
      collection times were lengthening enormously so that the energy
      signal suffered serious pulse height deficit (despite the maximum
      available shaping time of about 8 $\mu $s) and similarly
      the position signals were also lengthened tremendously (beyond
      8 $\mu $s).
      
      One approach is to lengthen the amplifier shaping time.  This will be
      possible since the PCB version of the TAIL will allow up to 24
      $\mu $s rundown time.  SSJ will undertaks some checks
      of the performance of the David Smith peak detect circuit with
      long signals and see what can be acheived in the amplifiers.
      He will also get quotes for replacing the Silena circuits
      with these, so that if we decide to go this way we can. \action{SSJ}
      
      However, this is not really an ideal solution.  Long term, we
      have to get away from this problem.   A few immediate actions
      were agreed:
      
      RC/DLW would explore options for beam irradiations to test how
      the other sample detectors we have stand up to damage (detectors
      from Eurysis and other prototypes).  This would also explore
      the Hamamatsu detectors with and without the edge strips shielded.
      It is felt worth the cost of deliberately damaging detectors
      to gain some insight.  During the tests the detector performance
      would be continuously monitored.  Possible locations for the
      tests are Surrey, York and Strasbourg (where time for detector
      tests is approved). \action{RLC,DLW}
      
      MF would continue tests with resistor chain readout on strip
      detectors to see what resolution can be achieved and continue
      discussions with Hammamatsu and Eurysis on what might 
      be possible. \action{MF}
      
      SPGC will explore possibilities for multiplexing if we move
      to DSSDs.  \action{SPGC}
      
      It is hoped we can discuss the outcome of these trials at our
      next meeting.
      
      

 
  \item {\em Neutron detectors (see various emails from NMC)}
  
      Seems like there is a possible interest in getting some neutron
      detectors in the system at ANU.  Possibilities include borrowing
      from David Hinde, borrowing from NAO (LPC has access to a few),
      or NMC's plans for ``MEGHA module" style detectors.
      
      Over the next couple of months NMC will work up the design of the
      latter.  MF will put together a short physics case outlining the
      types of experiments which this would allow.  Anyone with an
      interest in these ideas should contact NMC or MF.  We should be
      in a position to make a decision in the Autumn if we plan 
      to proceed. \action{NMC,MF}
 \end{enumerate}
     

\item {\bf Experiments at MSU}

 \begin{enumerate}
  \item {\em Report on last run}
  
  	RCL gave a report on the last run looking at the single proton
  	halo candidate $^{28}$P.  Although only two days had been awarded
  	to test the possibility of using the S800 to measure (d,$^3$He)
  	transfers, the setup had worked very well and a real measurement
  	made.  Analysis is still in progress, but it is hoped there
  	will be a physics result.

  \item {\em Update on two new proposals}
  
  	Two new proposals have been submitted.  RCL has an extension
  	of the above experiment to study $^{27}$P, and WNC/JSW a proposal
  	to investigate intruder 2s$_{1/2}$ mixing in $^{12}$Be and other N=8
  	nuclei.  The setups would be similar so would benefit from
  	running together.  However the PAC appeared to be very heavily
  	oversubscribed.  PAC meets 30 June.   The RCL proposal needs
  	24 detectors, the WNC/JSW one 16.   This would be the 10 thicker
  	Eurysis bought specifically for the fragmentation work, plus
  	some of the thinner Hamamatsu from the MEGHA pool.
 \end{enumerate}


\item {\bf Experiments at ANL}

	JTM reported on the run earlier in the year.  After a difficult
	startup, a lot of good data had been recorded.  The prime
	aim is to get spin assignments for \cc (\neon ,\cc \cc ), but some
	other interesting channels may also be there.  Data analysis
	awaits completion by JTM of his ANU data, but should start in
	a month or so.   The hybrids are in a sorry state.  NMC offered
	to work on refurbishing these and organising spare grids and
	windows. \action{NMC}
	


\item {\bf Experiments at GANIL}

 \begin{enumerate}
  \item {\em Progress on array and DA}
  	
  	There was some discussion on the drawings sent over by WNC,
  	and everyone was urged to send detailed comments back to him.
  	The overall feeling of the meeting was that it would be
  	best to try and go for a system whereby separate detector telescopes
  	existed which could be placed in arbitary locations.  It
  	was felt that experience showed programmes always developed in
  	ways which required new detectors and new geometries.
  	
  	There is a need to try and further refine our thinking in this
  	area.  MF agreed to arrange for a few people to go over to
  	GANIL over the summer to work on this for a few days with
  	WNC and NAO.  Anyone interested to contact MF. \action{MF}

  \item {\em New proposals}
  
  	The next PAC meetings for GANIL and for SPIRAL would probably
  	be held at the end of the year at the earliest.
  	
 \end{enumerate}

\item {\bf Plans for running in the next 12 months}

 \begin{enumerate}
  \item {\em ANU}
  
  	Plenty of data ``in the bag" (6 experiemnts from earlier in the
  	year) means there is no pressure for running in the near future.
  	There is also the problem of detector lifetime to be addressed
  	(see above).  It was agreed that it was unlikely there would
  	be a need for running before next Easter.  So far this year we
  	have used 22 days (from an allocation of zero!).  A series of
  	proposals had been submitted to EPSRC early in the year, but
  	the formal PAC process is only now getting underway (call in
  	30 June).
  	
  	Before the next running period it would be necessary to get
  	the new PCB versions of DA modules installed and running.
  	RH is presently working hard to get these ready.  SSJ offered
  	to help if there is anything he could assist with. \action{RAH,SSJ}
  	
  	The last alpha breakup running had shown that it may be a false
  	economy to try and re-use strip detectors.  The data taken with
  	a set of new detectors was vastly superior to the previous set
  	using old detectors.  BRF would arrange to send back all the
  	detectors from ANU and to have them tested.  He would also
  	get some quotes for new detectors.  We should be in a position
  	to decide on an order by October. \action{BRF}

  \item {\em MSU}
  
  	Earliest would be October.  No major constraints and could
  	fit in with demands for personnel/detectors at other locations.
  	In the absence of any clash would probably aim for Oct/Nov.

  \item {\em GANIL}
  
  	Uncertain when the approved experiment might run.  Would
  	probably be next year, in a window of opportunity when DEMON
  	finished at Strasbourg and before it returns to Belgium. Some
  	 possibility it might be later this year if major changes
  	to the schedule are required if SISSI is not available to
  	provide beams for certain approved experiments.  Possible
  	clash in personnel and detectors with MSU run which needs to
  	be watched. \action{RCL,WNC}

  \item {\em Strasbourg}
  
  	DLW and RAC will go over soon to install the chamber cables
  	brought from ANU.  DLW also agreed to take on responsibility
  	for the list of other outstanding jobs.  DLW is considering
  	a run around September and it may be appropriate to do the
  	detector tests (see above) at the same time. \action{DLW,RAC}
  	
  	The Li fusion measurement has been postponed a number of times
  	and now falls outside the timescale when GRK can carry it
  	through.  Everything is ready.  BRF will investigate who could
  	take this over.   If possible, it would make sense to do
  	this at the same time as the above. \action{BRF}
  \end{enumerate}
 	

\item {\bf Discussion on next grant submission}

  \begin{enumerate}
  \item {\em Timing of submission}
  
  	So far Lucy Brady had given no indication of any constraints on
  	submission, but it was known the gamma community bid for EXOGAM
  	would go in October, so it may be we would be asked if we could
  	go for December, although March would probably be preferable
  	for us.  BRF will follow this up.  \action{BRF}

In preparation it
  	was agreed there would be a two-day meeting 10--11 September at
  	Staffordshire.  The first would be a report on on-going work
  	(like our normal "physics meetings" at which everyone involved
  	in analysing data would speak (probably all students and RAs).
  	The second day would be a series of talks on plans for the
  	grant bid (both physics cases and equipment bids).  BRF would
  	arrange a programme and approach (strong-arm?) speakers.  RPW
  	would arrange rooms and accommodation.  \action{BRF,RPW}

Please put these dates
  	in your diary now. \action{ALL}

  \item {\em Scheme for producing grant documents}

	Basically covered by the above.

  \item {\em Computing issues related to grant request}
  
  	VP gave an update on recent developments and in particular
  	the opportunities for using PC hardware in future.  This is
  	likely to figure in the next grant application.  The gamma
  	community is likely to be bidding at the level of 4k pounds
  	per active researcher.
  	
  	It is inevitable that we are going to have to upgrade the
  	UNIX machines at ANU.  SMS would talk to VP to draw up
  	suggestions. \action{SMS,VP}
  	
  	Oxford have already bought a DLT 4000.  It was agreed we would
  	not replace any exabytes and would gradually move over to
  	data taking on DLTs as the Exabyte drives died.
  	
  	VP is going to look into the possibilities for a "suitcase"
  	DA system based on notebook plus VERY small ADC interface. \action{VP}
  \end{enumerate}
	
\item Papers

	With the new grant bid approaching, {\em GETTING ALL PAST WORK
	ANALYSED, WRITTEN UP AND SUBMITTED } must be everyone's top priority
	over the summer months. Present papers in progress are summarised below:
	
\begin{center}
\begin{tabular}{lp{9cm}} \hline
	RLC:&	MEGHA paper draft circulating, submit by end July;
                {\em final comments needed urgently} \\ \hline
	JTM:&	JP thesis paper submitted last week
		Analysis of ANU data almost complete - paper over summer \\ \hline
	MF:&	Working on $^{12}$Be paper -- out over summer \\ \hline
	NC:&	Draft of Si reaction paper about to be circulated \\ \hline
	NC:&	Starting on oxygen target paper - draft out over summer \\ \hline
	MS:&	Will produce NIMs paper on use of hybrids as part of thesis \\ \hline
	GRK:&	Li breakup draft out last week \\ \hline
	SMS:&	Will prepare paper on thesis data over summer \\ \hline
	SPGC:&	Revised version of \cc + \cc\  letter out soon \\ \hline
	SPGC:&	Follow-up \cc + \cc\  paper in preparation \\ \hline
        CDJ:&    Draft with RLC and BRF; revised draft by end August \\ \hline
        SPF: &   Final mods going in; submit by end July \\ \hline
        PL:&     Will be considered with other \cc + \cc\ work \\ \hline
\end{tabular}
\end{center}

	
	Apologies if anything is missed out.  Let BRF know. \action{ALL}
	
	A nice healthy state of affairs.   Should make for plenty of good
	Summer reading.   
	
\item	 {\bf Date of next meeting:} 

	Two day Physics meeting at Staffordshire 10--11 September\\[10mm]

\end{list}


%\newpage
{\large Note Added:\\}

\verb+From bw@np.ph.bham.ac.uk Mon Jun 15 12:01:35 1998+ (paraphrased, WNC)


~\\ {\large Charissa Colleagues}\\


\begin{enumerate}

\item  To match with
   other new grant bids, Lucy Brady suggests a submission in March, for
   a panel meeting on June.  This fits with the time slot
   we were talking about at the recent collaboration meeting.
Unless I have
   any strong replies to the contrary, I suggest we aim for a
   submission in March.

\item
 {\em PLEASE GIVE TOP PRIORITY OVER THE SUMMER TO GETTING ALL
   THE OUTSTANDING PAPERS SUBMITTED SO THEY ARE IN PRINT
   BY THE TIME THE GRANT GOES IN.}
  
  
\item As many of you know, Bob Chapman and his colleagues at Paisley
   are interested in the work we have been doing on
   studies of exotic nuclei using transfer reactions.  They
   would like formally to join in with us for the next grant
   application.  In the meantime, I've suggested to Bob that
   they would be very welcome to join in on the experiments
   along this line at ANU and GANIL.  Bob hopes to be able to
   get to the two day meeting in September to catch up on things.
   In the meantime, please include him on mailings (rc@odin5.paisley.ac.uk).
   
   
\end{enumerate}
   
   Brian


\vfill

\noindent
B.R. Fulton (edited by W.N. Catford, Secretary).\\ \mbox{} \hfill
June 10, 1998  (released \today )

\end{document}
