Presentation on theme: "Summary of MICE 4/4/2008 shift during the ISIS machine-physics period Goals for 04 Apr08 MICE shift: 1. Radiation survey in MICE Hall with target operating,"— Presentation transcript:
Summary of MICE 4/4/2008 shift during the ISIS machine-physics period Goals for 04 Apr08 MICE shift: 1. Radiation survey in MICE Hall with target operating, beam loss of 50 mV and D1 and D2 on; 2. Scan Target Dip; 3. Momentum Scan and study of particle rate vs beam loss. Constraints: Maximum number of target actuations this shift < 6000 Preconditions: MICE Hall and DSA searched and locked. Summary of Operations: 1.Target vacuum was created and gate valve opened. PH and PS took a picture of the target. MA, KT and AD re-mounted GVA1 (after being fitted with mu-metal shield) and tested the set up to the maximum field with no observable mechanical strain. 2.PH and PS established target operations at 50/128, reaching ~50 mV beam loss. 3.A first count of GVA1/GVA2 rate was done. Note: the counting gate was very wide (100 ms). Rate peak on GVA2 was found at 175 A. We fixed D1=400 A and D2=175 A. NB due to the wide gate a lot of noise was counted. 4.Radiation survey done (DO and JK) with the above parameters. AD checking counting rate was constant during the survey. 5.We set up the system for DAQ operations: shorter acquisition gate (2 ms), 7.8 ms after the ISIS signal. With this setting we repeated the scan in D2. KW produced a very clear peak at around 170 A (see mice e-logbook https://micelog.dl.ac.uk for details).https://micelog.dl.ac.uk 6.The aforementioned scan in D2 was acquired in a series of runs via the DAQ system. VV to analyse the results. Conclusions: We confirm that D1=400A=480 MeV/c matches with D2=170A, producing a clear peak in count rate at GVA2 beam counter. With target producing the maximum allowed signal (~50 mV) a Radiation Survey was performed. While the result of it must be made official we received a reassuring comment from the surveyors: basically no increase in radiation was found in the Hall. DAQ was exercised for the first time. MOM-MA Key to names: MA: Marco Apollonio, AB: Alan Blondel, CR: Chris Rogers, AD: Adam Dobbs, PH: Paul Hodgson, PS: Paul Smith, KT: Kevin Tilley, KW: Kenny Walaron, VV: Vassil Verguilov. DO: Isis Duty Officer.
Beamline Commissioning: - missing Q1-3 !!!! waiting for PS module to arrive from DK (possibly within this week) - need a soak test with access to Synch. Vault - Q4-6 / Q7-9 can be tested - establish remote control - Solenoid test (date?) Target Issue - Open Gate Valve Ken, Paul [ Steve Griffith ] I have already discussed this briefly with Ken by phone on Friday, due to the actuator containment not being vacuum monitored it is better to leave the gate valve open. As this will maintain pressure throughout the system. Originally it was thought that the gate valve would only be opened when the MICE beamline was being operated. With this is mind I agree that there is nothing preventing the actuator being lower. The best way to prevent this is by isolating the rack or the motor, rack isolation does seem a little crude. A small MCB safety padlock on the motor AC supply will ensure that the motor can't be used. Both methods are acceptable as the gate valve will not operate as it needs a voltage signal to activate the solenoid. I agree with Paul, if the gate valve is to be left open a second key mounted on front panel of rack that allows motor operation would be a simple addition. I will discuss further and let you know the best way to resolve. Steve
Q1-3 SOAK TEST Q4-6 Q7-9 soak test ??? Solenoid test ??? install MAGNET ON lights