Download presentation
Presentation is loading. Please wait.
Published byWinfred Norton Modified over 9 years ago
1
BL1U at TRIUMF UCN Beamline Kicker Magnet (April 12, 2010)
2
UCN Facility in Meson Hall 12 mr 145 mr 18.5 deflection: KICKER
3
Kicker Specs: 500 MeV protons (p = 1090 MeV/c) 15 mr maximum deflection (Bdl = 0.0545 Tm); normal deflection 12mr effective length 1.5 m (physical available 2 m) aperture 100 mm x 100 mm (under review) field uniform to 5% over central 80 mm diameter region flat top 1 ms, flat to 5% over the 1 ms fires every 3 ms (330 Hz rep. rate, able to run continuously) can be re-configured (in <1 hr) to run as low as 100 Hz (33 Hz) rep rate power supply able to be located 10 m away Notes: The aperture is an important constraint. Reducing the vertical aperture reduces the current needed for a given deflection (or reduces the length of the magnet). Decreasing the horizontal aperture decreases the inductance, and hence the voltage needed for ramp-up and ramp-down. The rise time is also important. The high voltage needed for ramp up and down scales as 1/T rise The trade-off between the different parameters is shown in the next two slides.
6
7 mm 60 mm 100 mm “Two Sigma” beam spot containing 90% of beam is 16 mm wide by 5.5 mm high Beam moves ~8mm horizontally at exit of kicker when kicker fires Beam would still be 8.8 sigma from wall Smaller horizontal dimension reduces inductance and hence power supply voltage Smaller vertical dimension reduces the magnet length or the power supply current It’s important not to make the aperture larger than necessary Ceramic pipe How small can the aperture be?
7
Proposed time division of beam 50 s to 100 s 2/3 beam to SR 1/3 beam to UCN normal TRIUMF beam, 4 min. 0 0 0 0 1 ms 2 ms 1 ms 1 min. 120 A
8
Example of Proton Beam Sharing 0 0 120 A 80 A 40 A 120 A 0 A 1 min.4 min. meson hall UCN source
9
Preliminary Coil Design for UCN Kicker Mike Barnes
10
UCN Kicker Mike Barnes Aluminum Ferrite Air
11
Kicker Power Supply
12
Ramp-Up: SW1 and SW2 are closed, magnet ramps up from the high voltage + -
13
Kicker Power Supply End of Ramp-Up: + - SW1 is opened. Current circulates through D3, D1, and SW2
14
Kicker Power Supply Flat Top: + - SW3 closes as required to maintain the flattop with the low voltage supply + -
15
Kicker Power Supply Ramp-Down: + - All switches open. Current is against the HV for fast ramp down. Stops at I=0 when diodes become back biased.
16
rise/fall time ( s) Turns (N) inductance ( H) flattop current peak voltage 5430725 A4500 V 158120360 A2900 V 2612270240 A2500 V 5012270240 A1300 V 5016480180 A1700 V 5018610160 A1900 V Examples: This table shows some examples of what could be done for a 100 mm x 100 mm aperture. As the rise/fall time gets longer the required peak voltage goes down (all else being equal). For a fixed rise/fall time, the current scales as 1/N and the peak voltage as N. By adjusting N, we can trade current against voltage. The most likely choices are highlighted (Numbers are rounded off)
17
Kicker Aperture - Reducing Kicker Aperture sizes (Vert. & Horiz.) reduces the supply current & voltage requirements reduces P.S. costs - Limiting factor beam halo Coil Lifecycle - Kicker repeatedly going ON/OFF Mechanical stresses? - Limit to the total number of cycles the coils can go thru? - Spares recommended (M.Barnes recommends incl. spare coils) - Extend the lifecycle by changing Kicker rep-rate & flat-top? Kicker Failure Modes - Need to quantify the nature & frequency of kicker failure modes Issues:
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.