g-2 News   10 June 96

Lot's of things are happening here at BNL and elsewhere, this is an attempt to
summarize things for those of you who are not up to date on each aspect.

Kicker:	The HV pulser works and has delivered pulses up to 95 kV.  The
feedthrough remains a problem, and we do not yet have a delivery date.  The EB-
welding on the kicker electrodes ("magnet") is completed and installation in the
test vacuum chamber will begin soon.  

Beamline: Fault studies on the secondary line were completed last night and
tonight there is a good chance that we will bring beam into the ring for the
first time.  The flux looks consistent with the calculations.

Ring Cooldown:  A leak developed in the gate valve about the Roots Blower, and 
we have to warm up to fix it.  Once this is repaired, we will begin the 
cooldown again.

Inflector: Last week Lin Jia, Wuzheng Meng and I were at KEK, (Wuzheng is still
there).  The repaired inflector was installed in its test cryostat and the
first excitation took place on Monday.  The magnet quenched at about 2000A. 
There are approximately 40 cm of uncooled lead coming into the magnet, and this
section consistently quenched at this current.  The repaired joint seems to be
fine at the current reached.  It's resistance is slightly less than that of the
prototype joint.

Starting on Wednesday the magnet was warmed up and the
superconducting leads have been backed-up by the TOPAZ conductor to enhance the 
conduction to the cooling.  Instrumentation wires have been also re-aranged to
minimize the conductive thermal flux into the coil.  The repair was completed 
on Saturday evening and vacuum pumping was started.  Cool-down was started on 
Sunday, and excitation tests followed. 

The following message was received from KEK today (Monday):

From:	in%"akira@kekvax.kek.jp" 10-JUN-1996 12:40:12.81
To:	in%"bunce@BNLDAG.AGS.BNL.GOV"
CC:	
Subj:	G-2 Inflector test successful

Dear Gerry

This is a very short report just after the successful inflector test.
The magnet reached 3000 A twice.  One quench happened around at 2950 A
previously, but after that noquench happend.

The joint resistance seems to be low enough to keep cooling condition.
The measured coil temperature was less than 4.8 K and the joint temperature
was less than 4.5 K. 

We have decided to complete the test. 
More report will be sent tomorrow.

Best regards, and Good night

Akira Yamamoto and Wuzheng Meng

ps: Sorry about strange character below because of sleepy.







 kr 









hepp
    








         t t    hemagne